manifold machining

[Frederic Breitwieser]

Nope, no made up numbers.

The mopar plenum is 11 wide x 8 high x 14 deep.  The Buick plenum is 9 wide
x 4 high x 16 long.

Its my belief, based on not-so-scientific dyno pulls on the Buick V6
twin-turbo engine that more plenum is good.  Twin turbo GTP cars often have
more than double the engine displacement in the plenum.  Some of my plenum
volume is occupied, but not a lot of it.  Runners extra.  On the mopar
engine, the runners are very short (standard dual plane Edelbrock).  On the
Buick engine, the runners are homemade, and longer.  I originally had
something like 14-15" long runners, with a smaller plenum, then reversed
this.  5" long runners, with a huge plenum.  Aluminum transmission cooler
brazed inside.

-----Original Message-----
From: nacelp
To: gmecm at diy-efi.org
Sent: 4/7/00 1:31 PM
Subject: Re: manifold machining

**WHAT?**.
Fred:
Is there a typo here?.
You talking intake tract, or including runners, or what exactly for
these
numbers reflect?.
Grumpy

> My 451cid stroker mopar has a 1232 cid plenum,
> and my 252cid Buick V6 has a 576 cid plenum.  Though, there is nothing
wrong
> with mounting the throttle body right where the carb goes with an
adaptor
> plate, for a street car.  Racing is a different story.
>

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