Holley TBI Injectors VS Pressure

Shane Buss shaneb at ev1.net
Tue Feb 15 04:12:04 GMT 2000


What's the lowest effective pressure these injectors work well with? I
should have the 80#ers  tommorrow..

Shane
-----Original Message-----
From: Walter Sherwin <wsherwin at idirect.com>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Tuesday, February 08, 2000 4:45 PM
Subject: Holley TBI Injectors VS Pressure


>Shane;
>
>The Holley B2 TBI injectors do not typically like a lot of static fuel
>pressure.  I have never tested the #65's myself, but I have extensively
>tested the #85's on my flow bench.  According to what I've read & heard,
>both are constrained by the same limitations.  The basic problem is
>associated with the fact that the internal ball and pintle rod are
>magnetically "coupled", and that the internal hydraulic differential forces
>(a product of increased fuel pressure) can become sufficient to separate
the
>two elements and cease flow entirely.
>
>With a 4/1 amp driver, the #85's are happy puppies at 15psig when hot.
>Roughly 18psig is the upper hot operating limit, with same.  Cold, on the
>bench, the #85s will operate irregularly above 20'ish psig and will
>completely shut-off at 26psig.
>
>Not quite the same injector, but food for thought........
>
>
>Walt.
>
>
>
>
>>Date: Mon, 7 Feb 2000 22:31:00 -0600
>>From: "Shane Buss" <shaneb at ev1.net>
>>Subject: Fuel Pressure with Holley Injectors
>>
>>I'm running very lean with 65# injectors on my holley 670cfm tbi unit...
>>Im running about 16psi with the stock fuel pump...
>>
>>How high can i effectively turn up the pressure? I heard with the chrysler
>>injectors holley uses above 17-20psi could cause problems...
>>
>>How high is the stock fuel pump good for also..
>>Thanks,
>>Shane
>
>
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