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Author
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Topic: alcohol carb
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anglia
Journeyman Posts: 35
From: wauseon,ohio USA
Registered: Mar 2003
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posted 04-04-2003 09:24 PM
   
ok now I have the carb what do I need to do to make it work . Fuel pump ,plugs timing ,anything eles I need to know?
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jsracingbbf
Gearhead Posts: 2751
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 04-04-2003 09:28 PM
I like a belt driven fuel pump, even with a carb. I used to run a set-up with a bypass log. It was a C&S specialties 950 Holley with a AeroQuip style fuel log, Enderle checkvalve/bypass valve. ( where the return jets go )The pump was a Hilborn #1 size. I never ran a pressure gauge on this setup. never starved for fuel. Fuel cell was up front. ------------------
Jerry
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
Jerry: (speaking to Jeff) " you gonna take your doors off first round time trials?"
Jeff: (chevy guy, friend) No stupid why would I wanna do that?
Jerry: thought you might want to save them since I'm gonna blow them off anyway ( shrug walk off)
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anglia
Journeyman Posts: 35
From: wauseon,ohio USA
Registered: Mar 2003
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posted 04-04-2003 09:44 PM
Do you think that I can get away with one of the new holley electric pumps. how much gain do you think there is over gas?
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 04-05-2003 09:52 PM
I've just gotten online and have now seen this question (out of town til tuesday).I runa a BG alchy carb that flows 920 cfm. Iuse a Holley 350 pump with the cell mounted in the back. (I did make a 9.97 pass 2 years ago using a Volumax 250 pump, but I feel it is borderline too small). I run -10 line to a Holley Big Port regulator, and two -8 lines out if it (one to each bowl). I also run the bowl extensions to ensure adequete fuel supply at the carb. It works great. I have never had a fuel delivery problem with this set up. BUT, if I were starting over, I would probably go to a front mounted cell and a belt driven pump. It really is better that way. With the set up the way I have it now, my car is capable of high 9 second qrtr mile times, so it does work. Depending on how effecient your motor is now will affect how much ET you will gain. With my car, alcohol is worth anywhere from .3 to .6 in the qrtr, depending on which motor is in the car. With alchy, generally one step colder plug than you would run on gas, and the timing will vary from motor to motor. Mine likes alot of timing. (has run best with 46* of total in it  ) Other motors may run best with less timing. The only way to tell is to try it with the timing set where you normally would on gas, and go up and down from there and see how the motor responds.
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jsracingbbf
Gearhead Posts: 2751
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 04-05-2003 11:33 PM
KV covered it pretty well. I might add that BoLaws makes a pump that supposedly has an internal bypass so no return line is needed. It is belt driven. I've never run one though. I've heard they are good pumps though. I run a DSR pump now, from Darrel Saucier Racing. he used to be out of memphis but is not close to Indy. His pumps are run mainly by World of Outlaws guys. He has it set up for much closer tolerences than the Hilborn or enderle pump. It is also easier to rebuild and all billet.
Good Luck.
JS
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