Re: Theory time
Re: Theory time -- Russ	Post Reply	Top of thread	Maverick Message Board

Posted by: Ken Merring 02/23/2002, 12:28:42

I have a 750 Holley carb on my .40" over 289. I know its way over carbed. But thats what I had laying around. What would happen if I put a restrictor plate under the carb with lets say 4, one inch holes drilled in it similar to what the NASCAR boys are using? I figuring I would have to rejet the carb but would there be a problem with gas "puddling" on the plate? Or any other problems you could see with this idea? Just doing some "couch wrenching" with some friends. Thanks for your thoughts Russ .......................... Just an opinion Russ. ..I feel that that the 'FUNNY' airflow presented to an already large carb may not result in anything like good performance. You are now altering the air speed in a 'funny' way. ..First, air flow speed is reduced, flowing by the ports and boosters that should result in less fuel pull translating to funny jet requriements. Second, the air speed will have a very fast speed increase at the plate holes and who knows what the various results will be. ..I have built and raced restrictor plate single cylinder Kart engines and can tell you that the plate will limit the volumetric efficiency no mater what carb combo in mounted. ..At the plate hole, what happens is that the air can compress by evidence that the air speed increases but the fuel even in suspension cannot compress nearly as much fuel drop out etc., so there in, is a problem that cannot be over come. (Laws of physics) One can optimize a situation like this when running under a set of rules by working with contour, shape and lengths. The engines used with restrictor plates are, unless the rules prevent, very high in compression. May sound odd to run CR like that but remember that there is less air in the cylinder to compress, so it is a way to get a better return on power production. Later, Ken

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