Author Topic: stealing tech  (Read 17710 times)

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Offline jake318

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stealing tech
« on: November 17, 2008, 11:11:32 pm »
 hello all ... letting you know that we are trying something new.. going high compression on a flathead with  extream flow . i know compression fights flow on a flathead so we are going higher than normal lift and duration  to counteract  the negitive effect of compression on flow . Looking for balance of the two.  We got this from the guys running racing flaheads  on the westcoast ( flathead drag racers and car racing)  Jake

Offline mightymowe

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Re: stealing tech
« Reply #1 on: November 17, 2008, 11:24:15 pm »
It cant be done on a flathead.By the time you make the combustion chamber small enough to get the high compression,your valves are so shrouded that there is no flow.What they are trying to acheave with good flow is good cylindar filling.Use a long duration cam,and an open head,with the long rod from ARC,so that you get a long dwell time with the piston at TDC and BDC,and then you will make power.
David Peters

Offline jake318

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Re: stealing tech
« Reply #2 on: November 18, 2008, 12:45:02 am »
 Not getting higher compression by shaving head .... having ross pistons make custom pistons that conform to the head itself ... made a mold .. pistons deck will be slanted to form right up to the ramp inside the head .  We arnt going to shave the at all so the valve ports  will not be effected at all. This has already Been done many times by the car racers and being they spend 10k or more on a motor why not take a page out of their book. Jake

Offline Big daddy

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Re: stealing tech
« Reply #3 on: November 18, 2008, 06:02:22 am »
Been there done that, about 15 years ago I had Arias pistons make pistons with a 1/2" dome blank that I machined to match the head, then later lightened up. If you fill up the cc in the area above the cylinder bore you will interrupt the air stream as it tries to enter the cc, the motor will scavenge exhaust gas better but when the intake valve starts opening and the precious low-mid lift air flow should be entering the cc, guess what-there will be a piston dome in the way. We did learn about what configuration will work though, lets just say bigger isn't always better!!
Bruce Litton

Offline amcchevy1

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Re: stealing tech
« Reply #4 on: November 18, 2008, 02:32:33 pm »
my recommendation would be to deck the block to the edge of the valve seats and use the longer rod. that would build compression without disrupting too much flow.  also cut a fire slot in the head to get the spark and mix into the chamber.
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Offline jake318

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Re: stealing tech
« Reply #5 on: November 20, 2008, 12:24:44 pm »
 Big..... what lift and duration where you using ?   The flathead car guys said to go higher lift and duaration than normal to compinsate for the  dome getting in the way for a moment . Jake

Offline George Herrin

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Re: stealing tech
« Reply #6 on: November 20, 2008, 12:28:59 pm »
Key words you said ....Flathead car guys, well we ain't running car motors.
George Herrin #6
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Offline Rooster

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Re: stealing tech
« Reply #7 on: November 20, 2008, 01:25:07 pm »
my recommendation would be to deck the block to the edge of the valve seats and use the longer rod. that would build compression without disrupting too much flow.  also cut a fire slot in the head to get the spark and mix into the chamber.


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Offline jake318

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Re: stealing tech
« Reply #8 on: November 20, 2008, 04:47:01 pm »
Im looking at there tech because  they have been working flaheads for 40 years  and physics in the cynder doesnt know if its working in a car or mower

Offline mightymowe

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Re: stealing tech
« Reply #9 on: November 21, 2008, 04:28:50 pm »
There is a difference between a single cylindar and a multi cylindar engine.A good intake manifold works much the same as a header works on the exhaust,it develops more velocity and helps ram the fuel air mixture into the combustion chamber of adjacent cylindars.
David Peters

Offline Hitch

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Re: stealing tech
« Reply #10 on: November 21, 2008, 04:53:09 pm »
There's a lot of power to be gained without compression.I too have been fooling with them 40 years.Can't compare them with multiple cylinders. :noplease:
Carey Hulett aka Hitch
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Offline Old Goat

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Re: stealing tech
« Reply #11 on: November 21, 2008, 05:17:38 pm »
40 years!!! I thought you was only 38 years old!!! :D  Hey Jake318, I'd listen to whatever Hitch tells ya. I seen some of his little motors run  :omg:(awesome)

I also seen the cam lobes on that 5 hp. that George blew apart! Them 500 hp. Cummins motors we have in the  trucks where I work dont have that much lift!!!
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Offline George Herrin

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Re: stealing tech
« Reply #12 on: November 21, 2008, 05:40:31 pm »
There's a lot of power to be gained without compression.I too have been fooling with them 40 years.Can't compare them with multiple cylinders. :noplease:

LIKE I said these lil motors ain't a car motor. Quiet a bit different in how you do things with them. Hitch knows his stuff. I drive his pro-X and its powered by a 5hp flattie. It will run with anything and I mean anything in its class and can whip a few twins to boot. He KNOWS his stuff on flatties.
George Herrin #6
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Offline Hitch

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Re: stealing tech
« Reply #13 on: November 21, 2008, 06:24:38 pm »
One mow thing drivers it's not the lift on the cam but how long it holds the valves open to pump mow fuel & air.All my cams are wide lobe design,kinda like a roller cam.Can't tell ya no mow. :alcoholic:

PS
Thanks for the good words,ya'll ain't seen nothing yet.Wait till the Fat Man makes his way down the Texas Mile on the Snapper. :rofl:
Carey Hulett aka Hitch
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Offline jake318

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Re: stealing tech
« Reply #14 on: November 23, 2008, 01:35:36 am »
 Its already in the works.   Bye the way if the comparision is of cubic displacement. The Tarley Davidson flatheads twins , which are of close displacement of the briggs opposed twins . Also use high compression with extream lift and duration ....... these are Lawn mower engines ...  Half the fun of mower racing is working the lowest form of motor tech on earth and seeing what you can get out of it. It is dilutional to think that these engines are anything close to a racing product.... Jake

 

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