Reply With Quote4 accelerator pumps move more fuel than just 2.
The 14.7#'s of air pressure in the float bowls are pushing the extra fuel into the engine.
Hello all ,
Another ? about the intakes, I now have a tunnel Ram Wieand and a pair of 660's on top, thing runs great no hesitation, bog or anything else, just burns a ton of fuel . My engine builder , and a lot of other people say it is a waste, and to go to a high performance single set up, Team G, Edelbrock, etc..with a 850 cfm carb, like a demon or 4500 HP . I am only turning this motor to 5500 tops and need some advice here. What is the best set up? Can you have the same performance or better with a single set up? Help..
Bryan
4 accelerator pumps move more fuel than just 2.
The 14.7#'s of air pressure in the float bowls are pushing the extra fuel into the engine.
Dual 660s only have a total of 2 accelerator pumps (50cc diaphragm with 0.032-0.035" squirter holes)
Originally posted by Bryan Rose
Hello all ,
Another ? about the intakes, I now have a tunnel Ram Wieand and a pair of 660's on top, thing runs great no hesitation, bog or anything else, just burns a ton of fuel . My engine builder , and a lot of other people say it is a waste, and to go to a high performance single set up, Team G, Edelbrock, etc..with a 850 cfm carb, like a demon or 4500 HP . I am only turning this motor to 5500 tops and need some advice here. What is the best set up? Can you have the same performance or better with a single set up? Help..
Bryan
The 660's were built for drag racing, period. Tunnel ram carb. If you put a nice single plain with an 850 I doubt you will notice any difference in perfomance. If you are going to buy new get an hp, demons are junk, I have seen a few that dont run for shit. Just my two cents thou.
Originally posted by Bryan Rose
Hello all ,
Another ? about the intakes, I now have a tunnel Ram Wieand and a pair of 660's on top, thing runs great no hesitation, bog or anything else, just burns a ton of fuel . My engine builder , and a lot of other people say it is a waste, and to go to a high performance single set up, Team G, Edelbrock, etc..with a 850 cfm carb, like a demon or 4500 HP . I am only turning this motor to 5500 tops and need some advice here. What is the best set up? Can you have the same performance or better with a single set up? Help..
Bryan
I think that if you believe a guy is knowledgable enough to have him build your engine, you should probably listen to him.
If you get the air/fuel ratio balanced for maximum horsepower and/or maximum fuel economy the engine doesn't care how many carburetors it has. All carburetors have an adjustment to calibrate the air/fuel mixture (jets) and you can adjust/jet them to be too rich or too lean. A two- four barrel tunnel ram can be jetted to be too lean just like a single four barrel.
There is a big advantage from having eight barrels feeding eight cylinders, it's called good fuel distribution to the cylinders. Each carb barrel has a straight shot into each intake port.
If the automotive industry didn't need a low profile hood most of the carbureted automotive engines would have come equipped with a high rise, individual port, tunnel ram system for perfect fuel distribution.
A single plane four barrel intake manifold is a compromise between hood clearance and performance.
To cut down on the accelerator pump shot you can reduce the plenum volume for better fuel economy at low speeds.
Dennis
Originally posted by Bryan Rose
I now have a tunnel Ram Wieand and a pair of 660's on top, ...just burns a ton of fuel .
Welcome to the world of tunnel rams, Bryan.
My engine builder, and a lot of other people, say it is a waste and to go to a high performance single set up with a 850 cfm carb, like a demon or 4500 HP. Can you have the same performance or better with a single set up?
Bryan
Technically speaking, I think the t/r and two 4BBL's will give you better high-performance. Also, a lot of people out there think tunnel rams are all about top end, but they actually help significantly in the mid-range too.
It is true that a proper single 4BBL can be set-up to provide very, very good performance--this is definitely true as far as performance vs. cost is concerned when compared to a t/r set-up.
And if your primary concern is the additional amount of fuel burned with a t/r vs. slightly less power gain over an excellently set-up single, then you might consider a single 4 BBL.
I was downright shocked and astonished at the amount of fuel my tunnel ram and 660's swallows. But I'm never going back; my next motor will have two 850's on top. Try and beat that with your 4500.
LO
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