Carb spacers

[common 27]

  If clearance is no problem,what benefits will a motor see using a 1 inch or 2 inch carb spacer and what exactly do they do?

[go-fish]

The Wilson spacers are awesome! expect big gains. they transition from the 4 round holes to the open plenumn and make a legit 10-12hp on a hot motor.
They work best on single plane intakes.

[MEK-Dangerfield]

They smooth out air flow, and a second benefit is they lift the carb up off the hot manifold to prevent vapor lock.  Definitely go open spacer. The 4-hole job bogged me down.   
 

  Mike

[go-fish]

You didn't try this one then MEK :


"Wilson Manifolds Tapered Spacers feature a computer generated variable radius taper design that maximizes the airflow through the carburetor and enhances air/fuel distribution for more horsepower. Part throttle performance and distribution are improved by redirecting the flow pattern created by the partially open throttle blades and gradually reducing the velocity of the air/fuel mixture entering the plenum to allow for a smoother transition into each runner; full throttle performance is improved by increased flow. Our Tapered spacers can increase flow through the carburetor/throttle body by as much as 110 CFM. Wilson Manifolds tapered spacers will increase torque, horsepower and acceleration throughout the entire RPM range."
- Wilson Manifolds

[73Chally]

Gee, almost sounds like an add for the Tornado.

http://www.autobarn.net/tornado.html

Sorry, just kidding. 

[go-fish]

Well, Wilson Manifolds has quite the reputation in the racing industry. They have a few more products out like Mass Flow Nitrous Sheetmetal intakes , Official Manifold for the Hemi Shootout series,.....

[GoodysGotaCuda]

wilson spacer is nice, though sacrificing the loss of velocity its talking about would result in needing to twist to higher rpm to get the full effect, since reducing velocity of the incoming charge will be noticable on the low end. Which may 'hurt' a light to light car vs more strip/high rpm orientated car, in which that is designed for given their racing background. just my 2cents 


Are we talking a street motor? Strip? Whats the build/intake/heads/cam/etc

[dodge freak 2]

Not sure why you have no problems running a 2" spacer, thats alot but if you have the room, the best intakes for power would be the tunnel rams. They come both in single car and dual carbs.

[common 27]

  I've seen those before and thought they were just a gimmick too. Plus with a single plane ,do you want to put the 4 hole on there?I have the SD intake and was just wondering what a spacer would do

[go-fish]

Either Hot Rod or Engine Masters did some dyno tests with Wilson spacers and it showed conclusively that they made power. Of coarse, just as Goody eluded to, these HP gaines that alot of products proport to find are usually in the upper RPM range and of coarse Wilson is in the racing industry not the "street/ strip" industry.

[FJ5_440]

My old  4 speed 440 Cuda with a Holly SD with a Holly 850 double pumper saw definite benefits from a 1/2 inch spacer, but no real difference between the 1/2 and 1 inch spacer.  Keep in mind, that this was before dyno tuning was accesible, so the tuning was done seat of the pants and with the 1/4 mile timer.  I am not sure how much spacer you can run with the SD before clearance becomes an issue.

[kudakidd]

4 hole on a dual plane, open spacer on a single plane. Get a phenolic type that dissipates heat

[tactransman]

When I was running a '70 Duster drag car with a Hughes Engines built 440,He (Dave Hughes) purposely had me use a regular Holley flange intake,then use an adapter/spacer to go the the 1050 Dominator carb instead of using a Dominator intake. It worked!    
http://www.hughesengines.com/customerCars/projectDetail.asp?projectID=100086