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Fuel Pumps
Uprated fuel pumps are usually essential at some point when modifying an engine. There will always be some latitude in the the original pumps supply capacity, the danger is going beyond this, especially with a turbo charged engine. A high speed lean condition could result in melted pistons!
In order to calculate whether your pump is up to the current or planned horsepower output use the following formula:
Fuel Flow (cc min) = HP x K
K = 5.6 for forced induction and 4.6 for Naturally Aspirated engines
You might like to work the other way round and see how much power your pump can deliver. If you had a 130hp N.A engine and you wanted 180 hp and you know the pump delivers 644cc a minute what power would the pump supply.
Fuel Flow / K = HP so for N.A engine this pump will deliver 140 hp.
In this example you need to increase the pump flow to more than 828cc minute. In reality most pumps are rated well above the actual output of the engine in order to ensure the fuel injection system works correctly. If the pump is up to the job your next job is to check the injectors are. Divide the flow required at the estimated horsepower output by the number of injectors to get the required injector flow. Remember that you need to have an injector at least 15-20% higher flow than this. This is because to operate reliably injectors should only operate on around 85% duty cycle. So for our engine we want 180 hp from we need an injector of = 180hp x 4.6 = 828cc divide by 4 (4 injectors) = 207cc minute plus 20% allowance for duty cycle = 248 cc min.
We sell a range of uprated pumps online. If you have specific requirements or need more information please call.
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VertPower Ltd T/as Balance Motorsport are based in Henfield, West Sussex. We are close to Brighton and Worthing
