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Discussion Starter · #1 ·
First off, I'm talking about just the smooth bore ones not the ones like the airraid. In theory it should increase the plenum volume, which usually moves your power up in the power band alittle; correct me if I'm wrong. I see dh-racing(don't hate that's not what this threads for) has some, but they don't appear to be that thick.

Just want to know if anyone has tested these or can give some educated info on the subject. Also, is this a good/bad area to add the volume?
 

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I have an edelbrock for sale. i never really noticed much to be honest but try it they are cheap
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Discussion Starter · #3 ·
I have an edelbrock for sale. i never really noticed much to be honest but try it they are cheap
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Whats the bore, how thick is it and do you have pictures?

EDIT I don't see TB spacer's listed on their site, I only see adapter plates.
 

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lol not they dont do shit. I have a BDL one on my turbo lude and im pretty sure it does nothing. cool tho! bling bling! oh its also just another spot for a vac leak....boo
 

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Discussion Starter · #5 ·
lol not they dont do shit. I have a BDL one on my turbo lude and im pretty sure it does nothing. cool tho! bling bling! oh its also just another spot for a vac leak....boo
Sorry, I want to know if they're worth while on an all motor set up.
 

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adding volume to the plenum will usually produce gains in power.
but the location of where the volume is added is what gives it that bump in power, caused by less turbulence mainly. adding plenum volume at the TB mounting location really doesnt do anything at all.

the best way to add plenum volume and actually see a gain in power is to cut the webbing out of the plenum, then round off or knife-edge the edges of the ports in the top of the butterfly plate. then have a custom spacer made to go between the butterfly plate and the plenum to raise the plenum up a bit, making sure the spacer does not have webbing either of course; only the surrounding border.

basically cut like this:


i hadn't fully finished yet when that pic was taken, but you get the idea. then make a spacer that is the same exact shape as the mating surface of whats left on the plenum.

the benefit of this is that the runners will now be able to gather air from a broader angle due to the plenum surface above the inlets being further from the actual inlets. remember, air has momentum, and it doesnt like taking sharp turns when there isnt something to physically guide it through those turns. so by raising the plenum further from the runner inlets, you are allowing the runners to gather air from a larger chamber, and in a more direct line of motion instead of being forced to suck from the side and making the air curve more than it wants to
 

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