i have to be carefull to answer your questions.....Oh, and there's a reason Ford USA never went blow through aside from the first Paxton supercharged T-birds and 57 Fords and the 67 Shelby's....
if a blow through carb ruptures a power valve or collapses a float or has a in service fuel delivery problem, in the words of Assistant Chief Engineer for the 1979 Mustang 2.3 Turbo Project
Same with the blow through 1985 4-bbl Saleen PaxtonMustang conversion;
should have been a shoe in for CARB emissions certification,
but even the most excellent car sorters in the world had so many problems making a blow through carb work and be legal and safe, they avoided blow through carb instillations for years.
Gale Banks,
Austin Rover's MG Metro 1275/ MG Maestro2000 and
Ford of Europes 2.8 Capri Turbo and
Alfa Romeo's TurboDelta and
the Lous Esprit Turbo were the best blow through conversions.
The R5/R18/Feugo Renault Solex 1-bbl blow through carb instillations weren't very reliable because of in service fuel dlivery problems.
My summary?
Norm General from Ford was right,
but if your carbs are in good shape and you have a good, robust and well sorted fuel air distribution and linkage, Holley Weber 5200's will be a great blow thru carb.
This all goes back to what I said a while ago. If you use Webers carb to get an inital jump on horsepower before turbo charging is added, then a low pressre, less than 12 pound boost turbo with a mechanical fuel pump and Malpasi rising rate fuel regulator will allow a Weber carb to run easily and simply underboost.
The Italians, Germans (Zakspeed 2.8 Turbo Capri) and English made blow through turbos work by simply understanding what a carb does, and by using moderate boost increase, not huge ones.
Getting reliable 40 to 65% power boosts with just 9 pounds of boost was because they understood how to make the basic carbs work properly.
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