Electric Fuel Pump Question
#1
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I'm getting ready to start working on things other than the engine!!!
I have a question,
I have a 383, 9.4:1 compression with .540 lift camshaft and an RPM Performer air gap, with a 750 holley. I have been told that the Carter acorn style (438110 @ Michigan Motorz) fuel pump would supply this engine and be reliable. I know quite a few people that have run them and never had problems but they're on stock air boats, and non high peformance engines.
Any thoughts? I know this can open up a whole bunch of opinions, but it is winter,,,,,what 'cha got???![Whistle](/forums/images/smilies/whistle.gif)
Max RPM 5500
I have a question,
I have a 383, 9.4:1 compression with .540 lift camshaft and an RPM Performer air gap, with a 750 holley. I have been told that the Carter acorn style (438110 @ Michigan Motorz) fuel pump would supply this engine and be reliable. I know quite a few people that have run them and never had problems but they're on stock air boats, and non high peformance engines.
Any thoughts? I know this can open up a whole bunch of opinions, but it is winter,,,,,what 'cha got???
![Whistle](/forums/images/smilies/whistle.gif)
Max RPM 5500
Last edited by CC230; 01-24-2014 at 01:01 PM.
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HP x specific fuel consumption average/ fuel weight = 400 X .50 / 6.1 = 32.78gph
Well looking up the performance version of that pump on Summits website, the best one is 100 gph, that answers that! Thanks Cole.
This is from Boating Magazine:
Formula To Estimate Maximum Engine Fuel Consumption
GPH = (specific fuel consumption x HP)/Fuel Specific Weight
Constants Gas Diesel
SFC .50 lb. per HP .40 lb. per HP
FSW 6.1 lb. per gal. 7.2 lb per gal.
300-hp Diesel Engine Example
GPH = (0.4 x 300)/ 7.2 = 105/7.2 = 16.6 GPH
300-hp Gasoline Engine Example
GPH = (0.50 x 300)/ 6.1 = 150/6.1 = 24.5 GPH
Well looking up the performance version of that pump on Summits website, the best one is 100 gph, that answers that! Thanks Cole.
This is from Boating Magazine:
Formula To Estimate Maximum Engine Fuel Consumption
GPH = (specific fuel consumption x HP)/Fuel Specific Weight
Constants Gas Diesel
SFC .50 lb. per HP .40 lb. per HP
FSW 6.1 lb. per gal. 7.2 lb per gal.
300-hp Diesel Engine Example
GPH = (0.4 x 300)/ 7.2 = 105/7.2 = 16.6 GPH
300-hp Gasoline Engine Example
GPH = (0.50 x 300)/ 6.1 = 150/6.1 = 24.5 GPH
Last edited by CC230; 01-24-2014 at 07:32 PM.
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quikie rule of thunb; take a zero off hp and you have gals per hour needed. 400 hp...40 gph. i ran 1 holley red pump for 2 moderate 350's for a couple of weeks. never any fuel delivery issues.
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I'm using the stock Merc mechanical pump and VST system on a very similar non-stock EFI motor (377 cid/ 9.45:1 / .545" ) with 42# injectors and it seems to hold up. No lean out issues due to insufficient flow. Having said that I'm not familiar with what the stock (Merc) mechanical pump output is.
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Trash, I wish I could use a mechanical pump, my new block isn't drilled for it. I know I could drill it out with a jig, but i'm kinda liking the idea of getting fuel to the carb sooner VS turning the engine over to get pressure. At least untl it get a few psi of oil pressure anyways.