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Tractor Pulling Discussion Forum

Re: Manifold length vs torque

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07-01-2013 19:29:42

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The longer your intake runners are, the lower the rpm at which peak power occurs. Search google for intake runner length calculators! I've personally seen dyno results with consistent #'s showing the effect very clearly....tuning to a specific "pulse " is most effective, however any lengthening has this effect.

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07-02-2013 16:05:55

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 Re: Manifold length vs torque in reply to shanes66charger, 07-01-2013 19:29:42  

Gonna stick my neck out on this one but I don't think you'll ever see the HP difference between the two cause of the length difference. If there are differences that would increase the flow, maybe, but at the rpm range these engines run as compared to auto engines where most of the testing is done I think it would be insignificant, How far can you move the torque curve on an engine that runs 2000 rpm if that, depending if you're pulling rpm limited classes or not.

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07-03-2013 04:36:34

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 Re: Manifold length vs torque in reply to mEl, 07-02-2013 16:05:55  
The rpm isnt the problem, its more that it takes a huge length increase to make a difference.

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