Hi Tom,
As Earl said, 2.5 to 3.5 psi pressure for SU carbs.
The fuel flow required by an engine is called Brake Specific Fuel
Consumption (BSF). It can be estimated as follows:
The range of BSF for most engines is from 0.35 to 0.6 lb/hr/hp. (pounds
per hour per horsepower) Average is about 0.5 lb/hr/hp.
Gasoline weighs 5.6 to 6.5 lb per gallon. Use 6.0 lb.
Example: 150 hp engine --- 0.5 lb/hr * 150 hp = 75 lb/hr &
75 lb/hr / 6 lb/gal = 12.5 gal/hour.
A pump that supplies 12.5 gal/hr at 2.5 psi should be adequate for 150
horsepower.
The SU pumps such as the AUF300/AZX1300 are rated at around 15 gal/hr &
should handle 180 hp. Other pump brands are available with similar or
higher flow ratings.
A 15 gph flow equates to two pints per minute which you can roughly
check by running the pump output into a measuring cup for a minute. Not
as exciting as full throttle runs up a hill, but easier on the engine.
At least for an estimated starting point.
Dave Russell
Thomas Mulligan wrote:
> "It is a diaphragm type pump with correct pressure and flow specs for SU
> carbs"
>
> What are the correct pressure and flow specs for SU carbs? Are they all the
> same?
>
> Thanks
> Tom
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