Anyone ever dyno test stock GM BB 3 carb set up ?
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- amcenthusiast
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Re: Anyone ever dyno test stock GM BB 3 carb set up ?
Part of this discussion could be on how the two 'secondary carburetors' effectively shorten intake runner length making 'six pack' induction system function as a variable length runner manifold.
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Re: Anyone ever dyno test stock GM BB 3 carb set up ?
The Qjet was such a great carb that Ford even used them on the 429CJ motor.....the SCJ got the Holley of course.mag2555 wrote: ↑Thu Oct 12, 2017 12:15 pm If it where not for GMs foresight and getting there hands on the new Rochester 750 cfm Q-jet in mid 67,GM lines would have had a hard time in keeping there hp numbers up after 1970 when the emissions / fuel mileage crap kicked in.
GM may have been forced into trying to keep some multi Carb set ups I think!
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Re: Anyone ever dyno test stock GM BB 3 carb set up ?
While true, I suspect it's a matter of going from "too short" runner length to WAY too short runner length.amcenthusiast wrote: ↑Sun Oct 15, 2017 10:29 am Part of this discussion could be on how the two 'secondary carburetors' effectively shorten intake runner length making 'six pack' induction system function as a variable length runner manifold.
I never noticed a dip in the torque when the secondaries kicked-in, but then my 3x2 system is vacuum-operated. Chrysler 440+6 carbs installed over the years on various Chevy small-blocks--283, 350, 400. I have always assumed that I was giving-up horsepower compared to a modern manifold and a single-four carb.
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Re: Anyone ever dyno test stock GM BB 3 carb set up ?
I worked at two different Chevy shops in '67.... at Humprey Chevrolet in Milwaukee I had the only twin post lift that would take a Vette with side pipes. I did new car set-up at Holz Motors in Hales Corners... drove too many tri carbed big blocks to remember. My butt dyno never felt any loss of tq.
Set up and drove the first Z-28 in Wisconsin and my "test drive" was done on a county road with a '66 360 hp Chevelle right beside me up to 80 mph... would have done better but that darn frame mounted Muncie shifter wouldn't let me power shift.
Set up and drove the first Z-28 in Wisconsin and my "test drive" was done on a county road with a '66 360 hp Chevelle right beside me up to 80 mph... would have done better but that darn frame mounted Muncie shifter wouldn't let me power shift.
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