IM Spacers

[Houston93CB7SE]

I've read/seen that a lot of people have spacers between the two sections of the IM. Curious as to what the point of it is? Searched arounda bit and didn't come across anything helpful.
Thanks.

[Jon]

LINKY

[Houston93CB7SE]

Thanks.
So it just lengthens the runner, gives an extra couple HP?

[turboAccordHSF]

Thanks.
So it just lengthens the runner, gives an extra couple HP?

High end Performance!...short runners Low end Torque...

[Granite CB7]

^I think you may be alittle mixed up, by adding length to an IM for example, you will gain low end and sacrifice alittle high end power. Think of the gains from ITB's compared to a long flowing IM setup, 4-1 to 4-2-1 header, or even open header compared to a full exhaust. Another example would be comparing the stock H22 IM to the Euro R manifold, Euro R is more mid-high.

[turboAccordHSF]

^I think you may be alittle mixed up, by adding length to an IM for example, you will gain low end and sacrifice alittle high end power. Think of the gains from ITB's compared to a long flowing IM setup, 4-1 to 4-2-1 header, or even open header compared to a full exhaust. Another example would be comparing the stock H22 IM to the Euro R manifold, Euro R is more mid-high.

hoenstl'y i never was talking about the H22 i was talking about the A6 and upper plenum H23....but ok

[deevergote]

He was using them as an example. The engine doesn't really matter either way.

[turboAccordHSF]

He was using them as an example. The engine doesn't really matter either way.

ok i'm confused i thought he meant the H22 IM....lol...not the motor...but i got mine all twisted sorry..i should remmeber cuz Gotz told me this like 3 times already...quick lessons onthe IM...lol

[Granite CB7]

^It's all good, it's a very common misconception but there are so many factors involved w/ shifting the powerband around. I was using those things as simple comparative examples of how a motor would respond w/ diff. IM or exhaust mods.

Getting back to the whole IM thing on the F22, technically the A6 runners would give slightly better high end over the 1/2" longer H23 runners, but I doubt you would see a diff. Obviously, the H series plenum's volume is the big factor. If you let's say deleted the IAB plate completely (plenum sits directly on the runners), then that would yield more high end gains, and sacrificing alittle low end.

[KeeleDesign]

he is correct, and his last example right their is exzactly what i just did to my manifold,
i know what high rpm's i stay in once up and racing, so i decided that i needed shorter runners to keep my peak hp in my high rpm powerband.

adjusting the distributer, the cam gears and the header all play a factor as well, heck everything does, but those are the most common used power curve tools.