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Farmall & IHC Tractors Discussion Board |
Re: Re: H Rebuild
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Posted by SCCA SOLO on July 24, 2003 at 17:20:55 from (208.51.55.188):
In Reply to: Re: H Rebuild posted by LanceM on July 24, 2003 at 16:39:16:
Lance,
Good question.
I think it would depend on what the stock volumetric efficiency is. If it could be significantly increased you should see a hp increase. Say the stock VE is 65% (guess) and you were able to increase the VE to 75% through porting and assuming the intake and exhaust can keep up with the flow increase you potentially could see a gain of 0.52lbs/min of airflow (Calc. done using 152cid, 1650RPM, 80F, 29.92 in Hg atmospheric press, and 50% relative humidity.) Using the rule of thumb I found of for every 1lb of air yields 10 hp (assuming proper amount of fuel is added) thats a 5hp gain from a cheap mod. I don't know what fuel density that rule uses. The lower the fuel density the higher the energy density, sound right to anyone? I have no idea what the ports look like in the H, its entirely possible that a gain in VE of 10% through porting the head of an H is entirely unrealistic. VE varies with RPM, I believe thats why different cams are used for different applications; to shift the highest VE to the RPM you will be using most often. I basically wanted to know where the bottleneck is, maybe the head flows fine and attention needs to go to the carb or manifold, I don't know. I've seen on other posts that people have put a head from a 350 or something in an effort to increase flow. No Idea what RPM's they were targeting or Compression. I am new to tractor engines, but I know quite a bit about auto engines. Same rules should apply or at least I hope so. I am not trying to be smart either, just trying to learn the most I can.
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