Bisi Bisi Cocoa Puff

[ExCoupe92]

this may seem like a stupid question but is the famous "bisimoto intake mini gasket" the same thing as the spacer? I saw something a while back and haven't been able to find it again of a spacer that ran in between the plenum and runners to get more air. thanks

[deevergote]

The intake gasket manifold goes between the head and the manifold. It prevents heat from the head from soaking into the manifold, thus heating the intake charge. I suppose it IS a spacer, but that's not really the purpose of it.

[judonoh]

NO, the gasket goes between the head and the runners.

[ExCoupe92]

excellent thanks, I guess I just need to look around again for the plenum space I found. I might still pick these gaskets up when I upgrade the plenum soon though.

[deevergote]

I'm not so sure the plenum spacer would do much... I know throttle body spacers are pretty much worthless on our cars, and I wouldn't be surprised if that was just as useless.

[Granite CB7]

Check this thread out in regards to plenum spacers!
http://www.cb7tuner.com/vbb/showthread.php?t=83042

[ExCoupe92]

on second thought, I might not even do this at all haha, thanks a lot guys

[quickangel93]

you could always buy his gasket. the gasket blocks off the heat from the cylinder head, making the intake mani more cooler. then in that case raiseing hp levels a bit.

[BB6-SH]

i'm going to purchase one of his gaskets it will help even more

[d112crzy]

I'm not so sure the plenum spacer would do much... I know throttle body spacers are pretty much worthless on our cars, and I wouldn't be surprised if that was just as useless.

noob. search before you spread false info!

a spacer on the manifold is nothing like a spacer on the throttle body.

Longer runners=more torque.

[deevergote]

But a spacer doesn't create longer runners. It technically creates a larger plenum... however, you lose the engineering behind the plenum design by doing that. It MIGHT help, but it could also create uneven airflow to each cylinder.

And I never stated anything as fact.

[d112crzy]

it gave ~5whp and tq...

[Accord R33]

But a spacer doesn't create longer runners.

If the entry point to the runner is farther from the center of the valve head...you have a longer runner

[deevergote]

But this is spacing the plenum from the runners, is it not?

We're talking about a plenum spacer, not the intake manifold gasket... at least I am!


If the plenum spacer does not have runners built into it, it does not increase the length of the runners. It increases the volume of the plenum... and as I said before, unless that increase is properly engineered, it could make a mess of things. It wouldn't cause major problems (though improper mixture could cause a lean condition in one cylinder, and rich in another... meaning any leaning out of the fuel mixture via ECU tuning could seriously damage the lean cylinder)

[d112crzy]

But this is spacing the plenum from the runners, is it not?

We're talking about a plenum spacer, not the intake manifold gasket... at least I am!


If the plenum spacer does not have runners built into it, it does not increase the length of the runners. It increases the volume of the plenum... and as I said before, unless that increase is properly engineered, it could make a mess of things. It wouldn't cause major problems (though improper mixture could cause a lean condition in one cylinder, and rich in another... meaning any leaning out of the fuel mixture via ECU tuning could seriously damage the lean cylinder)

I guess that depends on where you put it.

If you put it under neath the IAB plate, you are increasing runner length.

Actually, even if you put it on top of the IAB plate, it's still elongating the runners because the actual runners start right at the bottom of the plenum.

If you look here

that picture was taken from where the tb mounts on the plenum. You can see that there is metal already starting to mold into the runners.
here's another shot


Those pics are from Ciscos projects, btw.

So, with this spacer, you ARE increasing the runner length, not the plenum volume.