Without meaning to deflect the technical drift of this thread, I had a thought:
Whatever happened to those old Carter (WCFB?) and Rochester (4CG?) four-barrels that I remember coming with up-rated 283s? They flowed far less than 600cfm -- nearer 400 or 450cfm, I think -- and seemed to do the business pretty well. But then, I suppose both these carbs and the manifolds designed for them are now collector's items and pricier than Fabrege eggs. SM On 2/25/04 9:41 AM, "John Nasta" <[EMAIL PROTECTED]> wrote: > 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 320� duration) when a .490 lift and .295� 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/ > > > >
