Tapered carb spacers


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By PF Arcand - 13 Years Ago
There have been several references here and in YBM to Tapered Carb Spacers. What is a HVH tapered spacer? I've never seen a tapered one of any type. Which way are they shaped & what's the theory behind them?.. Thanks.
By aussiebill - 13 Years Ago
PF Arcand (1/6/2012)
There have been several references here and in YBM to Tapered Carb Spacers. What is a HVH tapered spacer? I've never seen a tapered one of any type. Which way are they shaped & what's the theory behind them?.. Thanks.

Over here they are used to keep carb level on inclined engine mounted position, .i.e speed boat, etcSmile

By Ted - 13 Years Ago

The ‘tapered’ spacers being discussed eliminate some of the eddy’s that form under a carb thus inhibiting some of the flow.  Said another way, the air flow becomes more laminar when using a ‘tapered’ carb spacer.  The tapered part of the description is coming from the ‘tapered’ cone that can be seen from the spacers underside.  As a general rule, carb cfm is increased when using these spacers.  Here’s a top and bottom picture of a ‘tapered’ spacer.  Four holes on top and open on the bottom.

  

By PF Arcand - 13 Years Ago
Ted: Thanks for the explanation & photos, interesting stuff.
By F250RED - 13 Years Ago
I have a wedge plate, was used to level carb.on marine application.4 bbl.was on a 55 292y A manifold,just 4 straight holes through casting, mounting bolts same pattern as A manifold,strictly to level carb,free to a good home if anyone has a use for it. f250RED
By pegleg - 13 Years Ago
Let me add to what Ted said if I may. The increase in area as the mixture flows thru the spacer slows the speed of the air some what. That helps with the transition from verticle to horizontal as it turns toward the individual runners. It also helps keep the fuel droplets in suspension at the bottom of the plenum, rather than the miniture "rivers" that eventually wind up in the chambers, but in an uncontrolled way. I'm certain that this helps keep the air / fuel ratios more evenly distributed between cylinders.

    The last thing would be an increase in the effective plenum volume which usually helps top end power, when it's needed. It's usually needed on a factory manifold on a modified motor.

   John and Geoff Mummert know vastly more about this than I do. Like to see John's input on this subject. Wink

By Glen Henderson - 13 Years Ago
These are the spacers that Ted used when dyno'ing the Falcon engine.

I want go into detail because I think he has a Y Block Mag artical in the works, but there is 37 HP difference with no other changes. Should be an interesting artical when it get printed.

By PF Arcand - 13 Years Ago
Frank & Glen: Thanks for the additional information..this is interesting!
By Ted - 13 Years Ago
The carburetor spacer test article to which Glen mentions will be in Y-Block Magazine #108.