Carb Spacers
- Thread starter ronbz455
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565bbchevy said:Blue Knight said:What if I told you that they make a spacer that add 100-300 horse power but it costs $500+-.
bar none this is the best carb spacer out there....
I actually think this is one is better.
what do you think about this one?
After seeing a dyno shootout on nitrous plates a few years back it made me a fan of the Zex perimeter plate set up, in each test it made more than advertised power and was far more consistent than the standard or double spray bars which are in the airflow path.
The top plate was a Wilson 4 hole but the plate alone cost almost as much as my kit did.
The top plate was a Wilson 4 hole but the plate alone cost almost as much as my kit did.
Nice looking Buick you got there.
On the V8buick forum, lost in some unrelated thread, there was a very in depth discussion about spacers and how they behaved on various intakes.
The conclusion was that the plenum volume on most 455’s varies greatly from one intake to another. The SP1 has a plenum volume that’s a bit low for the design of the intake. Adding a 1” spacer has always seemed to help in the cases I’ve read about. Someone suggested that the preferred spacer was something like 1.75” (don’t quote me on that) to get the ideal plenum volume. I think the coolrunner already has a decent plenum volume, so it will not benefit from a spacer as much, and instead will move the power band around (like you would expect a spacer to do).
I think the thread also talked about the intake designs. The wildcat coolrunner (which TA currently sells as the SPX, very similar design) was debatably an inferior design to the SP1.
The reason being, the 90* turn in the intake runners on the SP1 occurs at the beginning of the run, close to the plenum, where the velocity is already slow. The mixture then has a straight run to the valves, which ultimately results in a higher velocity into the chamber since the mixture has had a straight run to build the velocity.
The SPX (wildcat coolrunner) turns (albeit not 90*) at the end of the run. So arguably it has a slower velocity in the runner than the SP1 just before the valve.
I think in the end the SPX flows more, and both are very good intakes. But the intake used is very important for which carb spacer will work for you best.
On the V8 forum, Im sure someone could tell you which spacer they found worked best with a certain intake/application backed by dyno or flowbench.
On the V8buick forum, lost in some unrelated thread, there was a very in depth discussion about spacers and how they behaved on various intakes.
The conclusion was that the plenum volume on most 455’s varies greatly from one intake to another. The SP1 has a plenum volume that’s a bit low for the design of the intake. Adding a 1” spacer has always seemed to help in the cases I’ve read about. Someone suggested that the preferred spacer was something like 1.75” (don’t quote me on that) to get the ideal plenum volume. I think the coolrunner already has a decent plenum volume, so it will not benefit from a spacer as much, and instead will move the power band around (like you would expect a spacer to do).
I think the thread also talked about the intake designs. The wildcat coolrunner (which TA currently sells as the SPX, very similar design) was debatably an inferior design to the SP1.
The reason being, the 90* turn in the intake runners on the SP1 occurs at the beginning of the run, close to the plenum, where the velocity is already slow. The mixture then has a straight run to the valves, which ultimately results in a higher velocity into the chamber since the mixture has had a straight run to build the velocity.
The SPX (wildcat coolrunner) turns (albeit not 90*) at the end of the run. So arguably it has a slower velocity in the runner than the SP1 just before the valve.
I think in the end the SPX flows more, and both are very good intakes. But the intake used is very important for which carb spacer will work for you best.
On the V8 forum, Im sure someone could tell you which spacer they found worked best with a certain intake/application backed by dyno or flowbench.
online170 said:
Speaking of the v8buick fourm.. did you guys read this?
http://www.yellowbullet.com/forum/showt ... p?t=607203
lol
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