Holley TBI Injectors VS Pressure

[Walter Sherwin]

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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