Right, you can calculate for 100% VE and you probably won't get it, but if you calculate for 75% VE you definitely won't get it. You probably wouldn't even get the 75% you think you are trying to get because VE is influenced by more than just the carburetor.
Again, the key is to *be realistic* about what RPM you want to try to get 100% VE at. This is precisely why a 600 CFM is overkill on a 283 street engine. You would have to be running at over 7000 RPM to attempt to get 100% VE. I still disagree with you. I think you should get the carburetor that will give you 100% VE at a reasonable RPM according to the formula. It's true that you might not get the whole 100%, but I think you'll get a higher percentage than you would out of a carb that you know in advance can't give you more than 75% even with everything else being optimal. John Nasta -----Original Message----- My point is that you can calculate for 100% VE but, in reality, you'll probably never achieve it in a day-to-day car. So, why fool yourself into thinking you can run a larger carb at a higher RPM than you can really use? It's not a point of choosing a carb that'll only "get" you 75%, it's choosing a carb that'll make the most of the 75% you'll probably achieve. Even at 80% to 85% VE with the same basic engine, you're looking at 360cfm to 380cfm range. It's like selecting a camshaft, bigger sounds better (i.e., .580 lift at 320º duration) when a .490 lift and .295º duration will make your car drivable. I'd just say to give it some thought and don't run out and buy the biggest or most popular combo out there...it might not work for you. :*) Dale McIntosh I've stopped 1,542 spam messages. You can too! One month FREE spam protection at http://www.cloudmark.com/spamnetsig/
