SB2 Sheetmetal Manifold

[Rick360]

At a recent race I was looking at some Comp Elim engines. I noticed this SB2 sheetmetal manifold with nuts attached to bolts/studs on the plenum between the runners(see pic). They are on both sides and the bottom of plenum, 6 in all. I edited out the engine builders name to protect the innocent. The manifold as well as the engine were done by well known people.

What is being bolted inside this manifold?
Some fuel or air distribution device?
Does anybody have a picture of the inside of one of these manifolds?
Any ideas what it's for?



Rick

[SStrokerAce]

Rick from what I have found... you have to ask someone who knows with a very good guess on your plate, and it's probably not going to be answered in public.

Looks like something is attached between the outer runners and with one carb that's interesting.

Bret

[cboggs]

Rick,

I've worked manifolds that we made radius entrys
for the runners that bolted in place. We would make different
radius' and different thickness where we could adjust runner length
or entry size/radius buy changine the plates.

Don't know who built this manifold, .. but that's my stab at it, ..

Curtis

[user-9274568]

Rick

I'm sure it's a CFE. In Hogan manifolds we use to bolt a round tube, much like a aluminum or plastic tube, in the center of the manifold. This was to help seperate the fuel mixture or take up plenum space. On the new Hogans, he built it into the manifold with a hump in the center. I've seen it done with expoxy but it adds weight. The only reason I could see it bolted, was to take it out if it didn't work. Either way, who's to doubt Foltz or Patterson it a fast SOB!!

Chad

[SStrokerAce]

That was my guess to what it was, makes sense. Anytime you can change something by bolting something in rather than rewelding something makes testing a tad easier.

Bret

[cboggs]

Rick

I'm sure it's a CFE. In Hogan manifolds we use to bolt a round tube, much like a aluminum or plastic tube, in the center of the manifold. This was to help seperate the fuel mixture or take up plenum space. \Chad

Chad,

We used to do the same thing for auto cars, .. they liked a smaller plenum.
But look at where the bolts are on this manifold, .. don't think that's
what's going on here.

There's a 100 things it could be, .. on some BB spread port manifolds
we bolted in 1/4 round "humps" between some runners and saw some
dyno power, .. didn't seem to do much on the track tho'

Interesting thread.

Curtis

[shawn]

Those are stuffers. They are used to take up plenum volume in the intake. With a single four sheetmetal like that, on the dyno big plenum volumes and lots of spacer show power increases but at the track they almost always are slower, especially with a small cube comp. type motor.The auto. trans. just doesn't want to get back off of the bottom on a gear change.
shawn