NS Dev
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| posted on 6/11/09 at 03:02 PM |
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Fuel pump capacity, litres per hour for given horsepower??
Pardon the catchy title, but I've lost my old cribsheet and I need to do some calculations........
Anybody know the approximate litres per hour per hp for a typical car engine............
Only need be approximate, just got to calculate whether some pumps are big enough to to the job, and I can find the specified litres per hour for the
pumps.
cheers
Nat
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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BenB
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| posted on 6/11/09 at 03:37 PM |
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Presumably you can use the BSFC to work it out...
Most injector tables use a value of .52- presuambly a worse case scenario.
From wikepedia
The BSFC Calculation (in SI)
To calculate BSFC, use the formula BSFC = Fuel rate / Power
Where:
Fuel rate is the fuel consumption in grams per second (g·s-1)
Power is the power produced in Watts where P = Tω
ω is the engine speed in radians per second (rad·s-1)
T is the engine torque in newton meters (N·m)
The resulting units of BSFC are grams per joule (g·J-1)
Commonly BSFC is expressed in units of grams per Kilowatt-hour (g/kWh). The conversion factor is as follows:
BSFC(g/kWh) = BSFC(g/J) * 3.6*106
The conversion between metric and U.S. units is:
BSFC_METRIC(g/kWh) = BSFC_US(Lbs/(HP*Hr)) * 608.277
BSFC_US(Lbs/(HP*Hr)) = BSFC_METRIC(g/kWh) * 0.001644
Or just look here 
http://injectorrx.com/fpump.html
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BenB
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| posted on 6/11/09 at 03:38 PM |
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IE
Based on industry standards the B.S.F.C for:
Normal Aspirated Engines is .45 - .5
Supercharged Engines is .55 - .60
Turbocharged Engines is .6 - .65
Target Hp * B.S.F.C. = Fuel required in lbs/hr
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ashg
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| posted on 6/11/09 at 03:43 PM |
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just get the most powerfull one you can and let the fpr fo the rest 
i had a 275lph pump on a 250hp motor if that helps at 3 bar fuel pressure.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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NS Dev
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| posted on 6/11/09 at 05:01 PM |
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quote:
Originally posted by BenB
IE
Based on industry standards the B.S.F.C for:
Normal Aspirated Engines is .45 - .5
Supercharged Engines is .55 - .60
Turbocharged Engines is .6 - .65
Target Hp * B.S.F.C. = Fuel required in lbs/hr
cheers. will have a re-calc. Worked on 0.5 lb per hphr, but its turbocharged and I thought that would make a difference. Guessed that the rich mixture
would cancel out better volumetric efficiency but looks like not so!
Will recalc, though I think the decision is made, if we use Bosch pumps, will need TWO 044 pumps (the biggest they make), OR to go for a big
walbro........
The magic hp number is 700 or so, so just going for the biggest ain't going to work necessarily
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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chrsgrain
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| posted on 6/11/09 at 05:29 PM |
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That manta on the website is looking great - have you finished it yet??
Chris
Spoing! - the sound of an irony meter breaking...
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NS Dev
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| posted on 6/11/09 at 06:49 PM |
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manta?
do you mean the chevette? If so, then yep its getting there. Diff rebuild next week and then we should be able to get it on its wheels pretty soon
after.
We are actually about to start on a manta build, full house 400 wide arch jobbie built from a bare shell, though I can't go into too much detail
as its a bit secret until show season next year!!
We've got the 4.6 v8 into the CF van now, and started the rebuild work on that, and the silver mini has new sills, floors and steps fitted, next
step on that is the rear end work, 1/4 repair and boot floor mainly.
We've also just picked up another kadett C coupe for an engine conversion and restoration, have a capri brooklands resto waiting till next year
and a genuine porsche 356 resto on the waiting list too, ooh yea, and a capri mk1 to fit a jag IRS into as well.............
we're a bit busy
[Edited on 6/11/09 by NS Dev]
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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flak monkey
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| posted on 6/11/09 at 07:34 PM |
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280lph is enough for about 600bhp
Or there abouts
David
Sera
http://www.motosera.com
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T66
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| posted on 8/11/09 at 08:52 AM |
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You better both keep me some space for a Fiat 126 ....
Ive just posted this link up on the forum for fuel pumps.
The Swedish Saab tuners I have spoken to with big BHP cars use the Henko pumps.
As opposed to the Walbros we all seem to throb over
695 Swedish SEK = £69
http://www.exd.se/shop/index.php?page=shop.product_details&flypage=flypage_new.tpl&product_id=19&category_id=14&option=com_virtuemart&
amp;Itemid=1&vmcchk=1&Itemid=1
Ivan
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NS Dev
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| posted on 8/11/09 at 10:11 AM |
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cheers folks!
Yea, will be some room in the new year for the fiat, though we are rapidly finding a 2200 sq ft workshop a bit small!
Getting really busy now...........
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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T66
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| posted on 8/11/09 at 12:01 PM |
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quote:
Originally posted by NS Dev
cheers folks!
Yea, will be some room in the new year for the fiat, though we are rapidly finding a 2200 sq ft workshop a bit small!
Getting really busy now...........
What even a tiny weeny Fiat, you must be busy.....
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