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Tractor Pulling Discussion Forum

Question for CadS

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400man

02-01-2005 16:38:18




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Chad,I have a 400 with 4-1/8 bore step heads.The step is 3/16 tall.I have been told by other pullers to make plates and bolt them to the top of my pistons to raise compression.What is your thought on this? Several that I have talked to say they had no problems,Do you think it would cause flame travel problems or mess with the cylinder turbulance.Overall I guess Iwould like to know what your thinking is on this or have you heard of it?Any ideas are appreciated.400 man

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ChadS

02-01-2005 17:13:34




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 Re: Question for CadS in reply to 400man, 02-01-2005 16:38:18  
It would be not much difference than a high steped head piston like an M&W. Yes, I have heard of bolting pieces on to the tops of the pistons, Im not in love with that method, but it has worked before. We done a JD A like that long time ago. Hasnt came apart yet, but its a scary thought of it would. Eventually, it would burn up around the seams of the bolted plate, and the piston head. if it was a daily runner, then it would be more likely to come apart. If you intend on doing this, I'd custom make the domes, and add to a flat top piston, use a mill to put a indention the same pattern as the piece you bolt on, so it counter sinks the plate, lower into the piston head, a bit farther away from the heat. Then consider how to hold the threads into the top of the piston, and or use lock nuts, welded to the bolt. Im not sure, kinda a do it take a risk for disaster?? Pistons are not hard, nor expencive to obtain,to up your compression, and still keep your stock bore. Bout anywhere you look, there is something out there. ChadS

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champspa

02-02-2005 14:22:59




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 Re: Question for CadS in reply to ChadS, 02-01-2005 17:13:34  
a good welder can build up a step head , then machine it to what ever you need , I did and have 210psi average



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