Fins on back of Valve & Fins pre TB

[Jayme]

sorry... couldnt help it

http://lmgtfy.com/?q=alloytec+plenum+flap+rpm+open


theres an auto speed article that explains it.... its high rpm which its open.
funnily enough .... this thread is 3rd in the list of google LOL

[vlad01]

ok will take a look

[vlad01]

Hey, does anyone here know what rpm the alloytec.... err? oh looks like I looped around again lol

[Holden202T]

think of the flap in the plenum like a dual plane or single plane manifold .....

dual plane is good for street cars, single plane does fuck all below about 3000/4000rpm but works better at higher rpms!

[vlad01]

think of the flap in the plenum like a dual plane or single plane manifold .....

dual plane is good for street cars, single plane does fuck all below about 3000/4000rpm but works better at higher rpms!

So this potentially make the ecotec even more torquey at low rpm? not that its not torquey enough

[TdracerTd]

We had a VE SV6 manual before the jeep. It went like a cut snake. I loved it, but the missus said it had to go, so we traded it on a Jeep and I traded the old landcruser on a VE SS Ute when she wasn't looking.

[The1]

the flap would open at higher rpm, when more volume is needed, lower rpm when more response is needed and less volume it's closed. Esentially overcoming the problem with ecotecs and the ballance of larger or smaller plenum as you get both. A Plenum like this for ecotec/buick with a rpm controlled flap would be insane

[vlad01]

So lets do it!

[HQ355]

So lets do it!

To a bunch of bannana's or other holden V8 manifold !

[Jayme]

http://www.autospeed.com.au/cms/article.html?&A=2264

exactly as it says in the autospeed article... higher rpm = flap open