roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
How much Fuel ?
SBC, boat, approx. 550hp, gas, 4bbl. 1,200 ft. elev. "Carb Shop", is saying a 200 gph. mech fuel pump is neccessary. Biggest "Carter" is 172 ? How much is enough ? Max power should be no "fatter" than 12.8/1 afr. ? Thanks, roverman.
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ex-tyke Graham Creswick Chatham, Ontario, Canada (1166 posts) Registered: 10/25/2007 11:17AM Main British Car: 1976 MGB Ford 302 |
Re: How much Fuel ?
Per the "Tech Tips from the Professor" article in a typical Summit Racing catalogue, his fuel pump sizing method is based on the following:
At WOT, an engine requires 1/2lb fuel per hr per HP and 1gal gas =6lb. So, for a 550HP engine, fuel pump gph=550x1/2lb/hr =275lb/hr =275/6gph =46gph Based on this method, your carb shop recommendation seems high but you might want to have an independent look at this logic. Math correction made...must have been that last beer. Edited 1 time(s). Last edit at 04/09/2010 12:28PM by ex-tyke. |
Re: How much Fuel ?
You sure they didn't say a 200lb/hr pump?
Take a look at something like this - which is plenty for a 550hp carb'd engine: [aeromotiveinc.com] Look at the flow charts. A 200 gallon pump would be 1200lbs/hour! |
hoffbug Tony Hoffer Minnesota (323 posts) Registered: 10/15/2007 05:25PM Main British Car: Olds 215 EFI |
Re: How much Fuel ?
I was thinking something like this..
[aeromotiveinc.com] With a deadheaded regulator. [aeromotiveinc.com] |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: How much Fuel ?
Thanks all. I'm thinkin, they we're thinkin, Donald will be makin more like 500 hp, of which 200 lbs/hr. would be right there. Graham, when I do the math, 550 hp. X .5,(1/2), I get 275 ? Tony, HP X .23 + GPH. ? I don't know the GPH. How do I add an un-known ? Thanks for the refresher. roverman.
Edited 3 time(s). Last edit at 04/09/2010 11:39AM by roverman. |
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: How much Fuel ?
Ok, with "Graham's" formula, 45.8 gph/550 hp. "Tony's" formula, 126.5 gph./550 hp. Anybody else want to dable in the mistyque ? roverman.
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