12a PP intake runner length recommendations
#1
I have 44.5mm (1.75") ports and I'm looking for recommendations on intake runner length. The car will see a blend of street and track use but predominantly street, so torque will be a factor. I would rather have decent torque than maximum hp. I'm not saying hp isn't important but I would prefer a happy medium.
The setup is utilizing a Weber 48 IDA with 44mm venturis.
I intentionally left the intake tubes a bit long so that I may cut them to desired length.
After I figure out the intake I'll work on the exhaust
Any and all help is appreciated.
The setup is utilizing a Weber 48 IDA with 44mm venturis.
I intentionally left the intake tubes a bit long so that I may cut them to desired length.
After I figure out the intake I'll work on the exhaust
Any and all help is appreciated.
#2
i think the intake length is related to the port timing and exhaust length, so mazda's numbers are a guideline unless you have the same port timing.
competition book says the lengths they used are 155mm F and 165R for the rx7 and 135mm and 145mm in the rx3
competition book says the lengths they used are 155mm F and 165R for the rx7 and 135mm and 145mm in the rx3
#4
Originally Posted by Heath' post='912088' date='Nov 19 2008, 05:49 PM
Thanks for the info. So they use different length runners for the front and rear housings? I assumed they would be the same.
yeah, engine's not level in the car.
#8
#9
I also would be interested in the SAE paper. richard@greenbrothers.co.nz if it's not too much trouble.
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