907
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| posted on 7/8/05 at 08:17 AM |
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Fuel pump for Dellorto 45's
Hi All,
There's a chap on ebay selling electronic versions of the SU (tick tick tick) fuel pump.
One is rated at 1 to 1.5 psi, 8 gal/hour.
The other at 2.5 to 3 psi, 17.5 gal/hour.
The thing is, I don't know what feed pressure dellorto's require.
Presumably, if the fuel pressure is too high it overcomes the float neddle cut off, and the carbs flood.
Too low a feed rate and the engine is starved of fuel at full throttle.
My knowledge of this subject is limited, so any expert help would be much appreciated.
Anyone know the feed rate and pressure needed for dellorto's ?
Many thanks
Paul G
( My engine by the way, is a Lotus 907 and the twin Dellorto 45's are the standard carbs for this engine. )
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Avoneer
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| posted on 7/8/05 at 10:36 AM |
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I have my regulator set at 2.75 to feed my 2ltr Pinto with twin 45's and it's fine - mechanical fuel pump mind, but the input to the carbs
should be the same.
I've also set a few other to this pressure and they're all fine.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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SixedUp
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| posted on 7/8/05 at 01:32 PM |
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Hi Paul,
Most people run around 2.5psi into Dellortos. Mine are probably set a tad high at 2.75, but it works fine for me. As for flow rate, I found this
site, which had what looked to be useful information:
http://www.aempower.com/faq.asp?fid=17&sid=&tid=2
I can't remember what a 907 produces, but if I assume a max of about 200bhp, and allow a 20% safety margin on the pump, then you need about
16-17 gallons per hour. However, I suspect they mean US gallons, which are smaller than ours (dont ask!), so it looks like the bigger of the two pumps
is probably going to give you a good margin of safety (or headroom for tuning!)
Cheers
Richard
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907
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| posted on 7/8/05 at 05:03 PM |
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Many thanks Pat & Richard.
I'm off to Ebay now to order the big one.
(160 bhp in standard form by the way)
ATB
Paul G
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johnjulie
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| posted on 7/8/05 at 09:41 PM |
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Get the bigger one, and feed it via a Filter King filter/regulator. You can then adjust the pressure to what you want. Get yourself a Burtons
catalogue free,
www.burtonpower.com
page36 has a Filter King with gauge for £42.50
Cheers John
JFDI
"Just F*****G Do It"
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