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Harry Ferguson Tractors Discussion Forum
Show Parts for Model:

Re: Intake manifold differences.

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Author  [Modern View]
Jason S.

11-10-2013 18:07:41
174.237.2.148



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I copied this out of engine building 101

Intake Port Area
Unlike intake runner length which effects power over a narrow rpm range, the size (area) of the runner will affect power over the entire rpm range. If the port is too small it will restrict top-end flow and flow, and if it's too large velocity will be reduced and it will hurt low-end power. The larger the port is, the less strength the pressure waves will have.

There you go, it is the runner length that effects power over a narrow rpm range but the port area effects power over the entire rpm range which is what I'm saying. It would be like putting a large plenum large runner intake on a dump truck motor. Low end torque would suffer because the engine was not designed to move the amount of air and run the rpms that it takes to keep velocity up in that style of intake. There is an old rule of thumb that you never want to have the port size bigger than the intake valve diameter. The original intakes plenum and runner was 1.00" as I measured today. The aftermarket was 1.25" which is closer in size to the 1.14" intake valve size of the Z129 and Z134 engines. Also adding plenum volume raises the rpm that peak torque would would occur at. Look at the picture not only is the aftermarket a 1/4" bigger in diameter look how much longer it is which is adding plenum volume to the intake that only high rpms or added cubic inches could benefit from.

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