Fast 65# Injectors

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Oct 8, 2006 | 03:22 AM

JOHN LAWSON

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Fast 65# Injectors

How much fuel presure will I need for these to operate corect?
Thanks, John.

Oct 8, 2006 | 03:57 AM

JMBLOWNWS6

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From: New Braunfels ,Tx

59 psi

Oct 8, 2006 | 11:28 AM

JOHN LAWSON

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Quote:

Originally Posted by JMBLOWNWS6

59 psi

Thanks, That might be my problem.
This is a N/A engine. I have fuel presure set at 40#.
On the dyno it goes up to 4000 rpm and wont go any higher.
Thanks again, John.

Oct 8, 2006 | 01:09 PM

67Ranger

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you dont need a pressure for them to opperate, they just wont flow as much fuel. At 40 PSI they will be 53.5#. The formula for this is: New rating= old rating x square rt. of new pressure/old pressure. Hope this makes sense.

Oct 9, 2006 | 02:17 PM

Old Geezer

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Don't think that..

Quote:

Originally Posted by 67Ranger

these 65's are rated at 59PSI.

All of the FAST injs are rated at 45PSI. [Per their tech desk].The 65's are made by DELPHI.. They rate theirs @ 3 bars, [43.5PSI], as do most injector mfgrs, that are used in hipo applications.

Given they are rated at 65PPH @ 45psi, at 59PSI, they should flow 75.05#/hr.

I test alot of the DELPHI's and find they are very irratic at operating PSI over about 65PSI delta.

BTW, they are a low impedence inj....

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Oct 9, 2006 | 04:57 PM

JOHN LAWSON

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I called Fast tech desk. I expect to make around 800 crank hp. They said 45 psi should be plenty

Oct 10, 2006 | 08:42 AM

Old Geezer

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Yep..

Quote:

Originally Posted by JOHN LAWSON

I called Fast tech desk. I expect to make around 800 crank hp. They said 45 psi should be plenty

The math shows the injs will be "good to go", at 800FWHP..
800 x .5
_________ = 58.8#/HR
8 x .85

Quick ?? How big is this engine to be putting out that much "steam" N/A??

Let'r rip!