1959 F100 Carburator
#1
08-13-2015, 12:52 PM
1959 F100 Carburator
I'm trying to bring back to life a 1959 with 292 CI engine and need to replace the carb. The installed carb is a Holley R-2011, 2300. What I need to know is what CFM do I need for street use, 350 or 500? I have read that 500 is the max that I should use.
I just want to get it running again after sitting for 15 years.
I just want to get it running again after sitting for 15 years.
#2
08-19-2015, 06:52 PM
My experience was that a stock 292 just did not run right with a 500 CFM carb, it was jetted way too rich out of the box, pump shot too large, etc, even after jetting and such, it is just not the optimum size.
Carb theory says that the correct size carburetor means fuel will be atomized properly, this has to do with the venturi or bore size and engine size, equals air/fuel velocity. If the carb is too big for the engine it will never run right because of the large droplets falling out, this is a classic mistake for engine tuners.
It depends on your future plans for the motor perhaps, but a stock 292 is not a high performance motor as such and has very low compression. It's actually better to err on the side of too small, rather than too large. It will idle smoother and provide better low end torque and crisp throttle response. The stock carburetors provided for 292 equipped trucks were 1.028" venturi flowing something like 250 CFM or so.
If you want a little more performance for a stock motor, Holley makes a 350 CFM 2bl. that would be excellent, the stock size OEM carb is a little anemic. There was a method to the madness though, in those days Trucks were not used as everyday personal transportation and were often loaded to the gills.
Carb theory says that the correct size carburetor means fuel will be atomized properly, this has to do with the venturi or bore size and engine size, equals air/fuel velocity. If the carb is too big for the engine it will never run right because of the large droplets falling out, this is a classic mistake for engine tuners.
It depends on your future plans for the motor perhaps, but a stock 292 is not a high performance motor as such and has very low compression. It's actually better to err on the side of too small, rather than too large. It will idle smoother and provide better low end torque and crisp throttle response. The stock carburetors provided for 292 equipped trucks were 1.028" venturi flowing something like 250 CFM or so.
If you want a little more performance for a stock motor, Holley makes a 350 CFM 2bl. that would be excellent, the stock size OEM carb is a little anemic. There was a method to the madness though, in those days Trucks were not used as everyday personal transportation and were often loaded to the gills.
#4
08-19-2015, 10:41 PM
Oh, anything that will bolt on will work. But if you dig around the net with the carb # should be able to find out the rated CFM.
You're not done yet, getting the right size carb is just the beginning. Carb tuning can be a little time consuming but it's definitely worth doing. Jet sizing based on altitude, power valve selection, pump shot/squirter - learn a little basic plug reading goes a long way, etc.
You're not done yet, getting the right size carb is just the beginning. Carb tuning can be a little time consuming but it's definitely worth doing. Jet sizing based on altitude, power valve selection, pump shot/squirter - learn a little basic plug reading goes a long way, etc.
#5
08-21-2015, 07:41 PM
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