STACKED 1" SPACERS???

Posted By: Labratt

STACKED 1" SPACERS??? - 07/15/10 07:19 PM

Just wondering if anyone has stacked a 1" open,and a 1" 4-Hole spacer together on their modified engine? If so,what results were achieved? I'm assuming the open spacer would be on the bottom,closest to the intake manifold.

Thanks in advance for your thoughts!

RandyB

Attached picture 6087634-GTXINPOLEBARN001.jpg

Posted By: rickstershemi

Re: STACKED 1" SPACERS??? - 07/15/10 07:24 PM

Quote:

Just wondering if anyone has stacked a 1" open,and a 1" 4-Hole spacer together on their modified engine? If so,what results were achieved? I'm assuming the open spacer would be on the bottom,closest to the intake manifold. Thanks in advance for your thoughts! RandyB

I ran an open 1" and a 1" supersucker on the roadster...it liked it

Rickster

Posted By: rt66jim

Re: STACKED 1" SPACERS??? - 07/15/10 07:49 PM

I would have to look at my log book. I'm pretty sure I gained a tenth when I used them both in that manner. Jim

Posted By: HardcoreB

Re: STACKED 1" SPACERS??? - 07/16/10 03:16 PM

In my (short)

life I have never seen (on dyno) an intake that didn't like some added plenum volume. Most intakes are compromised for vehicle packaging. But FWIW if it were me I'd mock assemble to make sure you have enough fuel line, throttle cable, etc. and bring it all to the track complete with squirters, jets, tuning wrenches and a monkey (like me) to help.

Also, FWIW, I think Zippy, thru some dyno tuning, found his engine liked a 2" open?

Posted By: sg66mopar

Re: STACKED 1" SPACERS??? - 07/16/10 03:50 PM

Last year I ran a 1" open on the bottom and a 1" Super Sucker on top a few times. Swapped back and forth between that and no spacer. Saw no difference.

Posted By: ZIPPY

Re: STACKED 1" SPACERS??? - 07/16/10 06:31 PM

In my opinion it would be worth a trip to Jake's dyno to see what happens just in case a spacer is a
small/hard to notice gain. If it picks up say 8hp it might be hard to notice at the track in a car like ours.

Quote:

Also, FWIW, I think Zippy, thru some dyno tuning, found his engine liked a 2" open?

Pretty good memory there

With a home ported 383 Street Dominator manifold, I tested a 1" 4 hole stacked on top of a 1" open. Both were plastic. Picked up 18HP with no other changes.

I then put a 2" open metal spacer on, with the 1" 4 hole spacer stacked on top. That picked up an additional 7 or 8HP. That was the max power combo...I thought 3" worth of spacers looked pretty silly, but whatever...and that was my last test on that dyno.....

Because of that I guessed the 383 Street Dominator was too small. Swapped on a Victor 383 intake, and I went to Jake's.

I then did almost the same test with the Victor.
A 1" open spacer picked up only 8HP over no spacer at all. 2" open spacer was no gain. 4 hole spacer was no gain. To me, that said the Victor was a better WOT match to the combo (but not at part throttle, a whole other deal).

Besides hurting hood clearance, plan on changing accelerator pump values once at the track.
On mine I make this situation even worse by leaving at idle most of the time. I had to go from 37 squirters to 43's to get a clean launch. You may pick up HP and not show anything at the track, or even run alot slower because of this.

I wouldn't predict Randy's combo to show similar gains to mine because he's starting with a much better manifold. Most 383 intakes (in general...not talking about indy or victor stuff) are a little too small for what I want to do but Randy's is fairly well matched already. It's one of those pieces where Randy and I can't fairly compare combos because mine is B and his is RB.