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| TECH CENTER - Tech Discussion - Fuel System Requirements
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TECH DISCUSSION
FUEL SYSTEM REQUIREMENTS
BRAKE SPECIFIC FUEL CONSUMPTION
Brake Specific Fuel Consumption is the ratio of fuel consumed (in lbs. per hour) to horsepower produced. This ratio is a direct indicator of how efficiently the engine converts fuel into power. Most factory gasoline type engines run approximately a .50 to .55 Brake Specific Fuel consumption (BSFC) range while a highly efficient normally aspirated race engine operates at approximately a .40-.45 BSFC.
- Most common turbocharged or supercharged engine configurations
run in the .55 to .60 BSFC range
- For Methanol powered applications the BSFC is doubled
(i.e. turbo/methanol: 1.10-1.20)
These factors should be considered when sizing & selecting injectors for your
particular application.
Generally BSFC = 0.50.
Example: How much fuel flow will you need to feed your new 440 hp E-Tec EFI
crate engine?
Lbs/hr = 440 x 0.50
Lbs/hr = 220
Example: What is the GPH for the 440 hp crate engine?
Lbs/hr = 220 ÷ 6
Gals/hr = 37
Please Note: The above equations and rules apply only to four-cycle engines. The equations have been simplified for ease of understanding. Answers will be approximate but generally will be close enough for use as a guideline.
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