LT5 fuel injector testing video. 93-95 injector retrofit question

[Hog]

I was re-watching Pete's low 11 second 350 cube 1/4 mile run videos, when I was side tracked to an injector test featuring a set of 1991 LT5 injectors with 14,500 miles on them.

http://www.youtube.com/watch?v=i_C_9UOWsVE

Very interesting.

Is there a way to re-machine the 90-92 fuel rails to accept the later 93-95 squirters?
there are a few cutters on the market that are used to make specific injector holes in generic bulk length fuel rail stock. If a cutter that matches the 1993-95 injector design, could the 90-92 rails be cut and then use the 93-95 injectors and seals? or is their not enough material, or other negating factors?

TIA

[Kevin]

seems like a lot of work for injectors that are still going to fail

[A26B]

Originally Posted by Hog

......
Is there a way to re-machine the 90-92 fuel rails to accept the later 93-95 squirters?

The fuel rails are the same 90~95. The difference is the lower primary injector seal design at the injector housing.

........ could the 90-92 rails be cut and then use the 93-95 injectors and seals?

Substituting "injector housings" in place of "rails" above, possibly, but unnecessary for the benefit gained, which would only standardize the lower primary injector o-ring.

or is their not enough material, or other negating factors?

New injectors for both primary & secondary, are the same in all respects, flow & body configuration. As such, there is no more 90~ 92 and 93~95 injector differentiation. The difference between those model years is only in the lower primary seal placement & size. So all you would gain is going from one o-ring size (PN 10067600) to another (PN 17112222). Not worth doing any modifications.

[Hog]

Thanks Jerry, very informative.

[c4koh]

Yes, I can attest to what Jerry says. I just replaced all injectors on my 1992, which Jerry supplied from FIC, and the difference between the primary and secondary was a big or a small O-ring.

In the primary, there is a large O-ring seated into the injector housing, and the "fat" part of the injector sits into that, leaving the flange T-tip with no small o-ring. For the secondary injectors, which are identical, they snug in by the T-tip flange itself, and in this case do have a (smaller) O-ring.

As noted, the new injectors are ethanol tolerant, the old ones not, and the replacement was simple, easy, and works well - so other than NCRS aspects (maybe...) no reason to not move to newer technology.

Steve

[Kevin]

Primaries on the left, secondaries on the right, FIC injectors.