Heymow - Lawnmower Racing Forum

Engine Help => Briggs Flathead => Topic started by: NH Mowster on November 28, 2012, 08:39:02 pm

Title: Re-use rods
Post by: NH Mowster on November 28, 2012, 08:39:02 pm
I have a 42 series 18 hp oppy that I'm rebuilding and it has some wear on the cylinders so I'm going to bore it .020 over. Now I mic'd the crank and its still at factory specs and so is the rods. What would the disadvantage of re using the old rods? I've seen people post don't reuse but don't give a good reason. I will be turning this engine about 4500K and may hit 5k from time to time and I will be running a billet flywheel. Also I'm trying to find Don's video for the oppy but can only find engines 101 or is that one for the oppy? It says for 8hp on up.
Title: Re: Re-use rods
Post by: carolinablue on November 28, 2012, 09:11:46 pm
I dont know much about oppys but if your spending the money for boring and alum flywheel i would spend the extra for a good set of billet rods. Rooster the guy you need to talk too.
Title: Re: Re-use rods
Post by: NH Mowster on November 28, 2012, 09:39:44 pm
Yeah I know if I'm spending the money get them but if I don't have to spend $120 for new rods I would be a little more happier and so would the misses  :rofl:
The $350 flywheel and the $100 pistons already put a big dent in my wallet and I haven't got a rebuild kit yet or other parts. So if the rods will last me till next season that would help. The rods look in good shape. It was a grass cutter before I got it and the previous owner took good care of it and was spotless. I was really excited to get this motor
Title: Re: Re-use rods
Post by: FlatheadPuller on November 28, 2012, 10:37:53 pm
The stock rods are fine depending on wich ones you have. The dull colored 40 rods are the best. Put the 40 rods on the 42 crank and cut the top of piston off to get zero deck hieght. Lightens the rotating assembly. Just make  your oil clearance is correct and look thru heymow for rod mods to make them live.
Title: Re: Re-use rods
Post by: cycloneracer on November 29, 2012, 12:38:35 am
If you have extra blocks and cams run the used rods.  That way when one blows you only have to buy pistons again.  


When a rod blows it tears up a bunch of stuff!  
Title: Re: Re-use rods
Post by: Rooster on November 29, 2012, 01:45:14 am
Lots of oppy's out there running stock rods. keep an eye on them.
BTW…everyone will say "Ask Rooster"…
When Rooster learned, He asked Flathead Puller ;)
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 06:57:53 am
It has 42 rods in it now but I do have a 40 engine that I ran last year so I can reuse those rods. How much of a pop up will that leave me that I have to cut off the new pistons? What's the best way to cut them down? I'm a machinist so I have an array of machines to choose from. Hey Rooster, everybody has to learn from somebody lol thanks for the advice guys
Title: Re: Re-use rods
Post by: garrywarber on November 29, 2012, 07:53:52 am
Also I'm trying to find Don's video for the oppy but can only find engines 101 or is that one for the oppy? It says for 8hp on up.

Go to the G-Team site if it isn't there in the eBay G-team store.  Same price in the end.  Mine states "Motor 101 opposed" on the dvd case...
Garry
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 08:26:31 am
OK thanks Gary. By the way if you use 40 rods and mill the piston would all that change the displacement of the engine? If so would it be after all that?
Title: Re: Re-use rods
Post by: Jeff McKelroy on November 29, 2012, 11:01:48 am
Lots of oppy's out there running stock rods. keep an eye on them.

 ;)
Title: Re: Re-use rods
Post by: willenglish on November 29, 2012, 11:13:27 am
It would not change the displacement of the engine. Only bore or stroke changes would affect that. It could...and probably would change the compression ratio though.
Title: Re: Re-use rods
Post by: Rooster on November 29, 2012, 11:18:09 am
It would not change the displacement of the engine. Only bore or stroke changes would affect that. It could...and probably would change the compression ratio though.
Not a noticeable change in Compression.
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 12:18:58 pm
 Oh OK. I didn't know if using .020 over pistons and a longer rod would change anything. I guess milling the piston would keep it close to stock stroke.  :lol: should I recon the 40 rod to make it fit the 42 crank with .004 clearance? I just plan in lightly sanding the crank journals to make sure they are smooth then polishing it. They want $80 to do that in town. I've got some plastigauge somewhere in the shop I will use before I do anything first to see where I'm at on clearance. Going to get a price today to see how it will cost to bore this thing in my dads friends engine machine shop. I would do it but my cutter only goes down to 3.500 and I think that will be a little too much
Title: Re: Re-use rods
Post by: Huffy044 on November 29, 2012, 12:26:31 pm
 . I guess milling the piston would keep it close to stock stroke.   

Little clarification: Piston or rod has no bearing on the stroke, to change stroke you must change the location of the rod journal, bring it closer to the centerline ofthe crank and decrease the stroke or move it away from centerline and increase.

Also, longer rods GENERALY are better because, it raises the angle of the wrist pin in relation to the stock agle of the rod allowing less side load on the piston, also makes a longer lever to turn the crank.

Good luck!
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 12:28:48 pm
Thanks for the info. Learn something new everyday.
Title: Re: Re-use rods
Post by: Jeff McKelroy on November 29, 2012, 12:55:24 pm
In addition, a longer rod increases ATDC and ABDC piston dwell, which can allow for camshaft duration/lift combinations, spark advance, and fuel chemsitry advantages.
Title: Re: Re-use rods
Post by: Rooster on November 29, 2012, 03:09:57 pm
And don't forget....longer rods are always better....
Being able to say; "I modified it"...makes you Cool!
Title: Re: Re-use rods
Post by: Jeff McKelroy on November 29, 2012, 03:13:18 pm
And don't forget....longer rods are always better....
Being able to say; "I modified it"...makes you Cool!

 8)
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 03:22:54 pm
And don't forget....longer rods are always better.... Being able to say; "I modified it"...makes you Cool!   :rofl: :rockon: :rockwoot:
<~~~~ even he's is dancing  8)
Title: Re: Re-use rods
Post by: BIG AL 202 on November 29, 2012, 03:32:31 pm
This is a post from Rooster oil mods, you really should do this.   http://www.heymow.com/index.php?topic=17977.0 try this.
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 05:36:29 pm
Yeah I read that a few times hahaha I just called Don and just order the opposed twin 101 DVD  :woo:
Title: Re: Re-use rods
Post by: FlatheadPuller on November 29, 2012, 07:03:55 pm
Take it to a shop to bore it. Also take the rods in and have them sized. Its critical to it staying together. .002-.003 is good.
Title: Re: Re-use rods
Post by: garrywarber on November 29, 2012, 07:24:13 pm
In addition, a longer rod increases ATDC and ABDC piston dwell, which can allow for camshaft duration/lift combinations, spark advance, and fuel chemsitry advantages.

I too have learned everything so far right here from you guys.  I read short rods for torque and long rods for RPM.  Is that still the rule of thumb?  I want a low-rpm "torque monster..." :-)
Garry :weefly:
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 07:59:25 pm
OK thanks Flathead. I can resize the rods in my dads shop. He's a retired engine machinist and he still has some machines in the shop. He found his 3.00-3.750 cutter for his bore machine so there's another freebie  ;) I've taken the inspection plate off of the 40 engine and I'm looking at the rods, do they have 40 stamped on them like the 42's? The only number I see is a small 18. The 40 rods are the same bright silver color as the 42 and not a darker color like I was told?
Title: Re: Re-use rods
Post by: FlatheadPuller on November 29, 2012, 08:08:21 pm
Then its not an old 40cid. Just make sure thw bottom end right. Its the most important part. The other rods will work. The idea is just to get wieght off the rods to help them live. When I built mine I used late model 12hp pistons with the light piston and thin ring pack on 40 rods and cut the pistons as much as i could.
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 08:18:48 pm
OK I answered my first question by sticking my phone under the rod and snapped a picture  :lol: it says 40 with a 2 above it but the rods are a bright silver and not a dull color like what was told to be the best rods...
The model number on the 40 says 402417 and the date code puts it at 11-25-1981 and it has 42 heads on it. It had the 14 HP sticker on it at one time
Title: Re: Re-use rods
Post by: NH Mowster on November 29, 2012, 09:16:13 pm
OK? I just checked the valve size in the 40cid engine and its the same size as the 42 cid ? Intake 1.475 exhaust 1.250 on both engines but there is a 40 on the rods in the 40cid. The 40cid motor has no wear at all in the cylinders so could I just drop the 42 crank in with the 40 rods and just use the 40 block since they both have the same size valves?
Title: Re: Re-use rods
Post by: NH Mowster on November 30, 2012, 12:22:01 pm
 I looked up the 40 cid engine numbers and it came up as a horizontal shaft and mine is a vertical shaft. I'm thinking someone replace the tin off of another engine. The tin with the model number was black and rusty but the other tin was shiny and black with a 14hp sticker. The other tin with the model numbers didn't have a sticker. So its has a 40 rod, 40 crank, big valves and 42 heads and probably with a small Carb to get it down to 14Hp. I still have the old Carb but its in pieces and I've been running a 4bolt Carb off of a 20hp opposed. The engine ran good but I used it as a governed engine this year and was upgrading to the 42cid 18 which I have the 3 bolt Carb that was on that engine
Title: Re: Re-use rods
Post by: more4les on November 30, 2012, 12:37:35 pm
Mill the piston and make it a pop up piston. You need to take about .085-.090  off where the head is flat then angle up following the wedge in the head.

Lester
Title: Re: Re-use rods
Post by: NH Mowster on November 30, 2012, 05:25:51 pm
Lester do you have any pictures I'm a little confused  :confused:  how much do I mill on the piston and do I mill the head .085-.090 above the piston and follow the angle with the head? Sorry
Title: Re: Re-use rods
Post by: more4les on November 30, 2012, 05:42:51 pm
Sorry, mill the piston. I don't have any pictures though. Don't modify the head unless you need to clearance the valves (big cam).

Lester
Title: Re: Re-use rods
Post by: BIG AL 202 on November 30, 2012, 06:03:59 pm
You put the piston on the rod then, with no rings, put it in the cylinder. Bolt it to the crank and roll it over, then check how far it sticks out of the cylinder. Mill off that much, you have to check both and mark them for their respective cylinder.
Title: Re: Re-use rods
Post by: NH Mowster on November 30, 2012, 06:30:06 pm
Oh OK I get it. That's what I thought you meant just wanted to make sure. Do I use the 40 cam or the 42 cam?
Title: Re: Re-use rods
Post by: BIG AL 202 on December 01, 2012, 08:02:56 am
They should be the same but measure the lift and use the one with the most.
Title: Re: Re-use rods
Post by: NH Mowster on December 01, 2012, 04:44:17 pm
I got the 40 cid engine tore apart and got the 42 crank placed in with the 40 rods. It looks like I will have to take about .065-.070 off the top of the pistons. Of course I'm not going to do it till I get the rods resized and get a little further into the build. I posted a picture and hopefully it will post. I'm waiting for Don's video to come in the mail before I do anything else. The 42 cid cam is the same size as the 40 cid cam so I'm going to run the 42 cam.
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 06:51:23 am
I have 2 different types of 42 heads.one has a .020 ledge where the head gasket sits and the other one is completely flat. When I mill the piston I'm thinking of putting it on the lathe and making it a slight dome and use the thicker ledge head. I checked and from the deck to the spot right above the piston is about .050 distance and its only .030 with the completely flat head. Does anybody think that having say .020-.030 dome improve anything besides compression?
Title: Re: Re-use rods
Post by: birdman_express on December 04, 2012, 10:22:37 am
I have 2 different types of 42 heads.one has a .020 ledge where the head gasket sits and the other one is completely flat. When I mill the piston I'm thinking of putting it on the lathe and making it a slight dome and use the thicker ledge head. I checked and from the deck to the spot right above the piston is about .050 distance and its only .030 with the completely flat head. Does anybody think that having say .020-.030 dome improve anything besides compression?

I am not the flathead guy, but ALL I do hear from the ones who are purveyors of the Flatness, say flow..... Flow.....

FLOW!!!!!
Title: Re: Re-use rods
Post by: Jim Knutson on December 04, 2012, 10:29:00 am
use the heads with the ledge....but if you cam it, check for valve clearance in the pocket area. :woo:
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 11:35:58 am
I understand about flow and that's why I asked if anybody has tried to dome the piston. Would that help or hurt flow?
Title: Re: Re-use rods
Post by: The Tank on December 04, 2012, 11:50:19 am
I understand about flow and that's why I asked if anybody has tried to dome the piston. Would that help or hurt flow?
A dome piston is used to raise the compression. I'm no fathead guy either but I think the dome piston would hurt the flow.
Title: Re: Re-use rods
Post by: Jim Knutson on December 04, 2012, 12:01:24 pm
i ran .020 pop-out with a flat piston, and the taller head. besides making it harder to start, it returned negligible returns. i dont think running a dome, or pop-out is worth the time, or money in machine work.
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 12:16:33 pm
i ran .020 pop-out with a flat piston, and the taller head. besides making it harder to start, it returned negligible returns. i dont think running a dome, or pop-out is worth the time, or money in machine work.
OK that's jim. I didn't think it would help to much but I figured I would ask. I've been wrong before :doh:  Dons video should come in the mail today and I've got the crank polished. Going to recon the rods this weekend and start ordering some parts. Thanks everybody for your inputs, its greatly appreciated  :twothumbsup: if anybody thinks of anything that I may miss please post it.
Title: Re: Re-use rods
Post by: FlatheadPuller on December 04, 2012, 03:14:05 pm
In order to run pop out and have it be of a help you have to run big valves and big ports. Also the cylinder head must be machined to accept it. The port and seat area are not large enough in an oppy unless there has been some welding done do this. When the engine is all done pull the heads off and check the burn pattern. It will tell you alot. It will tell you if the engine is efficent or not. 2/3rds the piston should be black with carbon. Should be a half circle over the piston in carbon or staining. If it is not your combustion chamber is to tight and all that compression is killing it. Machine the piston flat with zero deck and run a 42 or 46 head. It will run good. If you want it to turn hard keep adding duration on the camshaft. They will clear .340-.360 lift with out machine work and still have the needed clearance around and over top the valve. Keep .100 clearance around and over top the valve when open. If you dont have it machine it untill you do. It will run. If the ead was thick enough yes you could run a stock piston and pop it out. leave it flat. Machine the head to accept it with .075-.100 clearance between the head and piston. Chamfer the leading edge of teh piston and rock and roll. But I wouldnt do this in a splasher luber system. The idea is to make it live and that requires removing rotating wieght from the rods. Thus longer rods and shorter lighter pistons.
The popout helps flow when utilized. The transfer area between the valves and the bore is bigger when poping the piston out. This helps flow but it must be done correctly.
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 03:20:30 pm
Thanks Flathead Puller.
Title: Re: Re-use rods
Post by: FlatheadPuller on December 04, 2012, 03:23:14 pm
(http://i222.photobucket.com/albums/dd259/dennisb777777/Red%20Rocker/th_000_0222.jpg) (http://s222.photobucket.com/albums/dd259/dennisb777777/Red%20Rocker/?action=view&current=000_0222.jpg)
Gienger cam and custom crank
(http://i222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/th_100_1052.jpg) (http://s222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/?action=view&current=100_1052.jpg)


(http://i222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/th_100_1053.jpg) (http://s222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/?action=view&current=100_1053.jpg)

Stock rods with bearing inserts in them. The bearings are for a 1.0 automotive engine. Resized to fit the bearing. Crank journal resized to fit the bearing. These were built before ARC had rods.
Title: Re: Re-use rods
Post by: The Tank on December 04, 2012, 03:26:24 pm
(http://i222.photobucket.com/albums/dd259/dennisb777777/Red%20Rocker/th_000_0222.jpg) (http://s222.photobucket.com/albums/dd259/dennisb777777/Red%20Rocker/?action=view&current=000_0222.jpg)
Gienger cam and custom crank
(http://i222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/th_100_1052.jpg) (http://s222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/?action=view&current=100_1052.jpg)


(http://i222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/th_100_1053.jpg) (http://s222.photobucket.com/albums/dd259/dennisb777777/connecting%20rods/?action=view&current=100_1053.jpg)

Stock rods with bearing inserts in them. The bearings are for a 1.0 automotive engine. Resized to fit the bearing. Crank journal resized to fit the bearing. These were built before ARC had rods.
The top pic showing the camshaft, is that brass on the cam lobe?
Title: Re: Re-use rods
Post by: FlatheadPuller on December 04, 2012, 03:32:47 pm
Its hardweld. Used to weld up the cam lobes. Theres a couple different colors of it. Not brass but not sure exactly what he used.
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 04:22:00 pm
What was the purpose of the automotive type bearings?
Title: Re: Re-use rods
Post by: FlatheadPuller on December 04, 2012, 06:23:55 pm
 I was turning my oppy pretty hard and this was the end cure along with proper oil clearance and good oil.
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 06:37:48 pm
But with a good clearance on the stock rods is the automotive type bearing really better?  Did you have to mill the outside of the bearing to fit the rod? I just got my crank done and don't want to send it to a shop because its a flat rate of $80 just to polish the journals, probably more then that to cut it down to fit the bearings.
Title: Re: Re-use rods
Post by: FlatheadPuller on December 04, 2012, 06:44:46 pm
Coming from my pulling experience I believe its a better idea then just the rod. Will it make a huge difference in your engine prolly not since your running a stock cam. The bearings were a drop in fit except for turning the crank under size and resizing the big end of the rod to make the bearing fit. The rod journal has to be cut under size .060. I think. Its been awhile since I built it.
Here you go.
(http://i222.photobucket.com/albums/dd259/dennisb777777/th_Movie.jpg) (http://s222.photobucket.com/albums/dd259/dennisb777777/?action=view&current=Movie.mp4)
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 07:01:21 pm
Oh OK. My engine is splash lube that I'm going to run a 42 crank with 40 rods and a milled piston. I was hoping Don G's opposed 101 DVD would come today but it didn't make it yet. I plan on doing all the oil mods and all the stuff Don says to do. I hoping with all the right oil clearances this thing will stay together for a while. I'm only turning it about 4500rpm and I have a digitrin CHT/RpM tach. I can gear my mower to the track to where it hits the 4500-4800 then I have let off to get into the turn. The 40 cid engine I ran this year was governed to 4000 and I had it geared to hit that and I was keeping up with the ungoverned oppys. This is a pic of my mower without the engine.
Title: Re: Re-use rods
Post by: NH Mowster on December 04, 2012, 09:24:10 pm
Have you or anybody tried Teflon coating the piston and/or rods? I know when I ran sprints some years back we built a 377ci with that coating on everything thing and it was the best engine I have personally ever driven.... besides the 410ci  :D another thing would I need to clearance the wrist pin hole on the rod bigger?
Title: Re: Re-use rods
Post by: FlatheadPuller on December 04, 2012, 10:09:54 pm
If you use arc rods an dthe short skirt piston the piston skirts are coated last I knew. Wrist pin holes are fine as factory.
Title: Re: Re-use rods
Post by: NH Mowster on December 05, 2012, 06:47:55 am
No I'm using stock rods and pistons. I wonder if it would help if it were coated? I may look into it. Thanks again flatheadpuller
Title: Re: Re-use rods
Post by: meanmachine on December 05, 2012, 07:36:44 am
beware of the stock rods either machine them for automotive type bearing inserts or buy arc rods, i can tell you i have seized two lower rods on my oppy with the proper clearances,i built my 42 oppy with stock 40 rods and cut the pistons down, just as don explains in his 101 dvd (btw the dvd was made before the arc rod for oppys were out) i would be money ahead if i just would have invested in the arc rod up front  :bash: trust flathead puller he is full of good info 8) just my 2 cents
Title: Re: Re-use rods
Post by: NH Mowster on December 05, 2012, 09:15:10 am
Is the use of the automotive type bearing to stop the rod from swelling and tightening  up around thecrank?
Title: Re: Re-use rods
Post by: BIG AL 202 on December 05, 2012, 09:49:13 am
Have you or anybody tried Teflon coating the piston and/or rods? I know when I ran sprints some years back we built a 377ci with that coating on everything thing and it was the best engine I have personally ever driven.... besides the 410ci  :D another thing would I need to clearance the wrist pin hole on the rod bigger?
YUP! http://www.universalcoating.com/ This is who I use, known him for years. Good folks to work with, If you contact them tell him AL sent you.
Title: Re: Re-use rods
Post by: NH Mowster on December 05, 2012, 11:32:12 am
Do you just do the pistons or the rods to?
Title: Re: Re-use rods
Post by: NH Mowster on December 05, 2012, 12:28:11 pm
I was checking and the Geo Metro has a 1 L engine. I may pick some up after work and  tinker with it tonight.
Title: Re: Re-use rods
Post by: BIG AL 202 on December 05, 2012, 12:43:39 pm
JUST PISTONS, TOPS & SKIRTS.
Title: Re: Re-use rods
Post by: NH Mowster on December 05, 2012, 06:21:41 pm
Just scored a pressure lube oppy for $150  :woo: :woo:  :lol: :dancing: :dance: :banana: :roflbow: :party: sorry I'm a little happy
Title: Re: Re-use rods
Post by: Jim Knutson on December 05, 2012, 06:23:53 pm
Just scored a pressure lube oppy for $150  :woo: :woo:  :lol: :dancing: :dance: :banana: :roflbow: :party: sorry I'm a little happy
same way i felt when i got mine for 125 and fuel money...! :D
Title: Re: Re-use rods
Post by: meanmachine on December 05, 2012, 06:29:24 pm
I was checking and the Geo Metro has a 1 L engine. I may pick some up after work and  tinker with it tonight.


yep the geo bearing are what i have looked into also, you can get undersized rod bearing, my local napa give me all the specs of the bearing for the geo let me know if they work for you i still need to put the rods back in my motor.
Title: Re: Re-use rods
Post by: westonedelbrock on December 05, 2012, 06:33:52 pm
same way i felt when i got mine for 125 and fuel money...! :D
make us all feel bad.  :( :P
Title: Re: Re-use rods
Post by: NH Mowster on December 05, 2012, 06:57:35 pm
make us all feel bad.  :( :P
sorry bud lol
same way i felt when i got mine for 125 and fuel money...! :D
the cool part is the guy lives 300 miles away and he going to be driving by so he'll drop it off

yep the geo bearing are what i have looked into also, you can get undersized rod bearing, my local napa give me all the specs of the bearing for the geo let me know if they work for you i still need to put the rods back in my motor.
did you have to cut the rod and/or the bearing or dis they have one that would fit the crank?
Title: Re: Re-use rods
Post by: NH Mowster on December 05, 2012, 08:11:58 pm
Sorry meanmachine I just can't type today  :lol: what I meant to say was with the undersized bearing did it fit the rod without cutting or the crank journal without cutting? I just checked and the price around here for a 91 Geo metro runs about $33.
Title: Re: Re-use rods
Post by: garrywarber on December 06, 2012, 05:38:23 pm
make us all feel bad.  :( :P

Last I knew, there is a 42 pressure lube still for sale in Kalamazoo, MI for 100 bucks...  The 46 pressure lube he had went fast though.  :-)  The owner is a member here, and has posted them for sale at least once, possibly twice so far.  I'll get it when finances permit, unless one of you guys does first.  I really don't care if it's pressure or splash, in fact I'm looking for 46's of the splasher persuasion, mostly.
Garry
Title: Re: Re-use rods
Post by: NH Mowster on December 06, 2012, 07:46:11 pm
Sorry Garry that's the one I'm getting.  :doh: he said he will bring it to me so he can break in his new engine in his car. I told him I would give him $50 for gas. I don't know if its 46 or 42? It doesn't  matter to me as long as it is a pressure lube.
I'm building a 42 splash but what concerns me is I have the engine sitting where the cylinders face front and back of the mower and the Carb sticks out of the hood on the left which puts the oil slinger on the left side of the engine. What's got me a little concerned is that when I go into a turn the oil goes to the right side of the sump pan and the splasher can't get enough oil to sling. So far I haven't had an issue but a pressure lube would make me feel better
Title: Re: Re-use rods
Post by: more4les on December 06, 2012, 09:28:18 pm
Sorry for not replying sooner. The pop up piston does not effect flow. The flow comes from the vacuum made by the piston travelling down the cylinder. Do not cut flow to increase compression by shaving the head. My pistons came out .090 of the block under the wedge and had .015 squish. I also remove much material from the block at the top of the cylinder. I open up the area between the valves and the cylinder right down to .010 above the top of the top piston ring. The pop up barely starts to recover what I remove. My engine builds just a little over 80 lbs of compression when starting but builds 180 lbs at about 3300-3600, don't know about higher as It won't turn much over that while only firing on one cylinder. I build my single flatheads the same way.

Lester
Title: Re: Re-use rods
Post by: FlatheadPuller on December 06, 2012, 10:38:36 pm
Lester the popout does affect the engine. It affects flame travel. If the head and piston are not modified correctly after poping the piston out it will kill flame travel wich will kill hp and it will also affect flow. The engine will be a weaser on the top end. A properly designed combustion chamber on a flathead will be able to support 120+psi cranking and still turn big rpm and make hp. 80psi is very low in my opinion. That engine would make more hp and torque if you got the compression up. You can verify the engine is efficent by checking the flame travel markings on the piston after running the engine a while.
Title: Re: Re-use rods
Post by: garrywarber on December 07, 2012, 06:38:08 am
Sorry Garry that's the one I'm getting.  :doh: he said he will bring it to me so he can break in his new engine in his car. I told him I would give him $50 for gas. I don't know if its 46 or 42? It doesn't  matter to me as long as it is a pressure lube.
I'm building a 42 splash but what concerns me is I have the engine sitting where the cylinders face front and back of the mower and the Carb sticks out of the hood on the left which puts the oil slinger on the left side of the engine. What's got me a little concerned is that when I go into a turn the oil goes to the right side of the sump pan and the splasher can't get enough oil to sling. So far I haven't had an issue but a pressure lube would make me feel better

Very cool!  It is going to someone that really wants a pressure lube.  Alex told me the 46 went right away, but he still had the 42, so it is almost certainly a 42.  Glad you got it; now it need not haunt my thoughts!   :lol:
Garry
Title: Re: Re-use rods
Post by: NH Mowster on December 07, 2012, 06:45:46 am
Thanks Garry. I will put it to good use  ;) to get the engine to fit under the hood of a new Holland s8 you have to turn the engine sideways or you will have to cut most of the up to get it to fit and I don't want to cut it.
Title: Re: Re-use rods
Post by: NH Mowster on December 08, 2012, 03:48:37 pm
 Just got my DVD and got the popcorn popping...
Title: Re: Re-use rods
Post by: Jim Knutson on December 08, 2012, 04:25:02 pm
get more popcorn, and some no-doze.... :lol3:
Title: Re: Re-use rods
Post by: garrywarber on December 08, 2012, 05:08:54 pm
get more popcorn, and some no-doze.... :lol3:

I have watched mine three or maybe four times now.  No-no on the no-doze. :roll:  You will be referring back on stuff, unless you are a lot smarter than me, which wouldn't take that much, I suppose... :crazy:
Title: Re: Re-use rods
Post by: NH Mowster on December 08, 2012, 07:33:14 pm
get more popcorn, and some no-doze.... :lol3:
lol I watched about an hour then had to leave for a Christmas party. Going to watch more tonight
Title: Re: Re-use rods
Post by: BIG AL 202 on December 08, 2012, 09:16:13 pm
IF YOU GET THE 28ci IT WILL SHOW YOU SOME OF THE OTHER THINGS HE DOES THAT YOU WON'T SEE IN THE OPPY DVD.
Title: Re: Re-use rods
Post by: westonedelbrock on December 08, 2012, 10:41:57 pm
IF YOU GET THE 28ci IT WILL SHOW YOU SOME OF THE OTHER THINGS HE DOES THAT YOU WON'T SEE IN THE OPPY DVD.
like? anything too helpful. i already have the oppy one.
Title: Re: Re-use rods
Post by: NH Mowster on December 09, 2012, 12:21:42 am
Great I have to buy another video!?  :lol: :doh:
Title: Re: Re-use rods
Post by: BIG AL 202 on December 10, 2012, 12:44:37 pm
Too many other simple little things to list. First came the 12hp flatty then the oppy, he shows in more detail the things he does.
Title: Re: Re-use rods
Post by: NH Mowster on December 10, 2012, 12:55:45 pm
Is it 4 hours long too?  :rofl:
Title: Re: Re-use rods
Post by: BIG AL 202 on December 11, 2012, 09:37:22 am
YES IT IS!
Title: Re: Re-use rods
Post by: NH Mowster on March 08, 2014, 05:26:54 pm
Hey guys, thought I would give an update to this engine build. Got the engine running and it ran great all season long. I was really surprised but I did have one issue.  Second to last race of the season the top rod bolts came loose and it started hammering.  Took it off the track and we found the rod bolts were loose  :thumbsdown: but it ran great up to then. Building the pressure lube oppy up with billet rods and avs pistons for this year :-)