pfi & 747's

[Shannen Durphey]

rr wrote:
> 
> I wouldn't be too quick to dismiss the '747 for a port
> injected engine. Edelbrock sells a pfi conversion kit to
> convert '747 powered trucks over to port.
> 
> In the tables they change the injector constant to 112, and
> the pump shot stuff to smaller values. The most interesting is
> that they leave the injector bias, min bpw, max bpw and the
> 'switch to async' mode pulse widths the same.
> 
> The key is to find out if they are using saturated or p&h
> injectors. Anybody know about this? Other thing in their
> favor is that these trucks are not revving too high. Although
> they add fuel fuel right up to the end of the ve table.
Here's what I have:

> They are 17 ohms DC resistance.  There is no other part number
> that
> Edelbrock gives for them except their house number of #3598.  They are
> pintle-type, they flow 30 lbs./hr at 50 psi, 20 degree spray cone.

Looks like 4 1/4 Ohms/bank of 4, yes?  Compared to around 2 Ohms for
traditional tbi injectors.

> 
> I'd bet they are using p&h injetors. As the pfi p&h's are
> twice the impedence as the tbi p&h's, you could drive
> four from one driver, in a parallel/series configuration.
> 
> BobR.
> 
> p.s. still working on an iac writeup, I'm knee-deep in school
> work, bit more off than I could chew. . . or is that grabbing
> a hot iron by the end opposite the handle <g>
Definitely the latter.
Shannen
> 
> (Three more Months!)
> 
> --
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