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Old 11-21-2020, 08:28 AM
PamRichardson PamRichardson is offline
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Location: Rockville, MD
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Default Restrictor for Holley 600

All --

Whether or not the restrictor rule is passed by the BOD, I have been preparing for it. My engine builder has found a source for it, but he must order 5 of them at a time. I only need one, so, if you are interested in one, PM me and I will get it worked for you. The cost will be approximately $30+shipping.

Pam
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Old 11-21-2020, 11:48 AM
PbFoot PbFoot is offline
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Thanks Pam. I would be interested, but the proposed rule does not say what the hole size will be for a particular spec line, just what the max will be.

"The max diameter of the holes is 39.0 mm. unless specified in the individual carís specification line."

BTW, from my research 39 mm is a very odd size for a Holley restrictor plate.
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  #3  
Old 11-21-2020, 12:49 PM
PamRichardson PamRichardson is offline
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Default Restrictor

I'm guessing that the one specified in the rule change is for all the carb cars at this point, since no carb car spec lines were listed in the rule change. I don't even want to think about the future of all this, but, I'd say that March 1, if the BOD passes this rule, the one that I'm getting will be required.

Pam
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  #4  
Old 11-22-2020, 01:26 PM
MarkMuddiman MarkMuddiman is offline
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Restrictors make sense if there's a master plan to equalize a wide range of carbureted engines. It provides a way to allow any carb, getting rid of the ridiculous details on the booster and throttle plate screws. It also allows the weight penalties for >311 cid to be reduced or disappear.

But, forcing what is essentially a zero restriction on the current FP 4776 carb is needless hassle.
First, round up instead of down from the 4776 throttle bore to 40mm.
Then, use "may" instead of "must".
If and when, in whatever future, there's a need to restrict the 4776 for a particular car, put that in the spec line(s).
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  #5  
Old 11-22-2020, 03:02 PM
Scott Sanda Scott Sanda is offline
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I don't know shit about carbs, with the exception of side draft webers from my GT3 days.

However, My TA2 car used a flat plate restrictor, and several years ago they changed it to this:

https://allstarperformance.com/adjus...-1in-all26060/

I run a ford, so it uses a 4BBL carb style intake, specifically a edelbrock Victor Jr although it is fuel injected.

It seems to me that if there MUST be a restrictor, it should be this piece, since it uses simple drop in components that can easily be changed to adjust for whatever you need.

Just food for though, and a lot simpler than everyone making their own, or having a bunch of different ID diameter.

And, as Mark points out, you can then eliminate the entire section on measuring all the little crap in the carb, since this will control the flow regardless of what is above it.

Scott
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