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Author Topic: Re-use rods  (Read 5688 times)
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Jeff McKelroy #55A
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« Reply #15 on: November 29, 2012, 11:55:24 AM »

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.
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Jeff McKelroy
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« Reply #16 on: November 29, 2012, 02:09:57 PM »

And don't forget....longer rods are always better....
Being able to say; "I modified it"...makes you Cool!
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Jeff McKelroy #55A
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« Reply #17 on: November 29, 2012, 02:13:18 PM »

And don't forget....longer rods are always better....
Being able to say; "I modified it"...makes you Cool!

 Cool
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Jeff McKelroy
Tulsa, OK 74128

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« Reply #17 on: November 29, 2012, 02:13:18 PM »

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« Reply #18 on: November 29, 2012, 02:22:54 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  Cool
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« Reply #19 on: November 29, 2012, 02:32:31 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.
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« Reply #20 on: November 29, 2012, 04:36:29 PM »

Yeah I read that a few times hahaha I just called Don and just order the opposed twin 101 DVD  woo
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« Reply #21 on: November 29, 2012, 06:03:55 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.
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Dennis Bazzett
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« Reply #22 on: November 29, 2012, 06:24:13 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
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« Reply #23 on: November 29, 2012, 06:59:25 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  Wink 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?
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« Reply #24 on: November 29, 2012, 07:08:21 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.
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Dennis Bazzett
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« Reply #25 on: November 29, 2012, 07:18:48 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
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« Reply #26 on: November 29, 2012, 08:16:13 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?
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« Reply #27 on: November 30, 2012, 11:22:01 AM »

 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
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« Reply #28 on: November 30, 2012, 11:37:35 AM »

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
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« Reply #29 on: November 30, 2012, 04:25:51 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
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