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Ingersoll-Rand publishes an engineers’ handbook called “Cameron Hydraulic Data”. Let’s double that to say 20 feet to take care of the bends in the steel pipe from the gasoline tank up to the engine fuel rail. Lets assume we have about 10 feet of 3/8” fuel line. Most of you know that the pressure drop thru a straight pipe is less than an elbow or a 45 (same principle as your air ducting from your blower thru the piping and on into the engine). Now we are going to calculate the pressure drop thru a 3/8” steel line for a typical vehicle at a flow of 83.3 gph or 1000 HP. 1000 divided by 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour. OK stay with me now as we calculate how much gasoline fuel we need to support say 1000 HP. The reason I am making all these conversions for you is because typical fuel pump measurements are made in volume versus mass although mass is more accurate. 7201 typical) then in round numbers we need 1 gallon of gasoline per 12 HP (5.994/.5). Since gasoline has a weight of 5.994 lbs/gallon a SG of. We won’t go into why one chooses such rich air fuel ratios suffice to say that using a BSFC of. Remember that maximum HP occurs at an A/F ratio of 13:1. At WOT (Wide Open Throttle) a BSFC (Brake Specific Fuel Consumption) of ½ pound of fuel per horsepower is quite safe: resulting in A/F ratios of 11:1 or richer. If we use alcohol we need about double the flow or with E85 we need to increase the flow numbers by around 30 %. Let’s see why today this is what I call a “wives’ tale”.
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The reason most people do not understand why is because “back in the day” when carburetors ruled and everybody ran a Holley electric fuel pump running at 14 psig then into a rail mounted PRV set to 6 psig the “pump head” was insufficient to overcome the pressure drop thru the 3/8” line: particularly if the pump was at the front of the vehicle. But before you do check out the following (and remember a dirty fuel filter is often the culprit of falling fuel pressures!). More pump head can be achieved with a bigger pump, higher pump voltage and/or increasing the line size. If the pressure falls as the engine RPM’s go up you need more pump head.
#RUBBER HOSE 2 INCH DIAMETER FOR GASOLINE INSTALL#
The simple way to know is to install an electronic fuel pressure gauge. Don’t I need to increase the size of the fuel line to at least ½” id (from a #6 to a #8 or #10) to support say 600 HP”? The answer is “NO”! A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! Given a big enough pump a 3/8” steel line could support 1000 HP. Quick reference for AN to Inch line conversion:įuel Line Sizing A question that is often asked of me when dealing with high horsepower applications is: “My fuel line is nominal 3/8” id. This is an interesting article that I came across that seems to be pretty relevant. Lots of strange information out on the internet regarding fuel line sizing and it seems like most of the time people run way more diameter fuel line than they need. Three Way Adjustable Remote Reservoir Dampers It does not store any personal data.Two Way Adjustable Non Remote & Remote Reservoir Dampers The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance".
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