Quote:
Originally Posted by steve25
GM did not make the Q jet Rochester mainly did and then Carter for a while.
The 4 bbl test pressure has always been 1.5 hg which converts to 20.4 inches of water, not 24 inches of water.
When David Vizards residence was CA he had a super flow 300 bench and around 2016 David had a Flowlab 520, when he moved to the east coast at some point he got a SF600.
Note the none of these 3 flow benches have the capacity to test a good size carb directly at 20.4 inches or 1.5 hg, which ever you prefer.
Testing with these benches would have called for testing at a lower pressure drop and then making the math conversion up to 20.4 inches, or the carb could have been flow tested by means of 1 or 2 barrels at a time and then added up, which can be misleading as compared to all 4 barrels drawing in at the same time around the air horn of the carb.
Here are the specs for a SF 300 and 600, from what I was lucky enough to still dig up on line about the Flow Lab 520 it had a capacity of about 450 cfm@ 28”.
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Dhoo! You are correct 20.4! Thanks for the correction.
I wanted to point out the devil is in the details with these kind of claims. But I did a poor job of it by not getting my details correct.