FS: Delphi 26lb fuel injectors

[tpepmeie]

Have some barely used (500miles) injectors out of the 427. These are Delphi units (Lucas style). These flowed 23 lb/hr @ 40psi. This is 26 lbs/hr at 50.7 psi, which is the LT5 rail pressure. For completeness, this is 24 lbs/hr at 3-bar (43.5 psi), which is the normal rating pressure.

Will let all 16 go for $200.

Todd Pepmeier

[tpepmeie]

TTT. make an offer.

[XfireZ51]

Al, and Bob G should jump on these.

[Hog]

Good deal there.

[randy ransome]

Does anyone know if these injectors work in a 91 ZR-1?
Need to know if they are a drop in replacement.

[XfireZ51]

Does anyone know if these injectors work in a 91 ZR-1?
Need to know if they are a drop in replacement.

Why do you think you need 26# injectors?

[csavaglio]

I don't think he meant he needs them, I think he was asking if they were a stock sized replacement.

They would fit, but flow too much for a stock car. If I recall, stock is about 21 lb/hr.

[XfireZ51]

I don't think he meant he needs them, I think he was asking if they were a stock sized replacement.

They would fit, but flow too much for a stock car. If I recall, stock is about 21 lb/hr.

Right. I was curious as to what modifications were requiring 26# injectors.
Stock inj. Run at ~23#.

[Schrade]

Are they too much for my stock '90?

Can anyone on the boards do a spray test?

This car is the only fuel injected car I've owned, that turns over 4-5 times, sometimes a second key pull, before it fires. I really think a spray test is in order.

Short of a spray test showing what I have now, I'm VERY interested, just to have them ready, at that price...

[randy ransome]

I have a 368 cubic inch, Cory Henderson built, with a 63mm throttle body.
Stock cams, just wondering if these injectors will be too big?

[XfireZ51]

I have a 368 cubic inch, Cory Henderson built, with a 63mm throttle body.
Stock cams, just wondering if these injectors will be too big?

I'm assuming Corey tuned the motor as well and he's one of the best. The real issue w larger injectors involves control of the PW at idle. Too big an injector and a smooth idle becomes problematic.
There are big displacement motors running on stock injectors although that doesn't mean they couldn't use more fuel. A determining factor is assessing the injector duty cycle at WOT. Is the injector going "static" in order to provide the proper amount of fuel at WOT?
Rule of thumb is you'd like to be at ~85% duty cycle.

[randy ransome]

I got ya. Yea, I'll just order the replacements from FIC.
Idling problems are what I'm having. Thanks.

[tpepmeie]

The real issue w larger injectors involves control of the PW at idle. Too big an injector and a smooth idle becomes problematic.

There is NO risk of idle control with 26 lbers. At idle, the entire pulsewidth is sent to the primary injectors. This is likely well over 4msec, so not even close to the non-linear portion of the injector curve.

If the calibration is modified for 26lb injectors, you will notice no adverse affects.

[tpepmeie]

Bump TTT. Need these gone. Make offer.

[Pete]

Todd,timing timing timing is everything we just went with bigger injectors on one of the big inch FBI Z's.

If tuned for these injectors idle will be fine,LT4's came with 28lb injectors or were they 26lb either way they idled fine.

GLWS
Pete

[tpepmeie]

bump. Nobody needs a nearly new set of stainless injectors for $200. Thought these would go a lot sooner.

[XfireZ51]

Todd,

Is this what you used for the 427? If so, any sense of what the duty cycle was at WOT?

[tpepmeie]

Todd,

Is this what you used for the 427? If so, any sense of what the duty cycle was at WOT?

Dom,
yes, these were used in Build 1 of the 427. I think they were around 63% DC per the math. 24ms pulse width x .51 (secondary scalar) = 12.2ms per injector. The datalog I have from the chassis dyno stopped at 6200 rpm.

I don't have the datalog from the engine dyno. But I can say that we were running 12:1 at 7000 rpm/700 chp, but with ridiculously high VE table values. Translated-- I think other components were limiting the fuel delivery, not the injectors.

These injectors *should* be good for:
750 chp @ 80% DC
650 chp @ 70% DC

high 670's was the uncorrected hp from the engine dyno on that day with those atmospheric condition. So, I'd say the DC was in the low 70% range at peak power on that day.

[Jagdpanzer]

Todd,
PM sent
Are both primary and secondary injector tips the same stlye as used in the later 93-95 engines?

[tpepmeie]

yes, later style tips.

[XfireZ51]

Todd,

If you still have the datalog, there's a way to interpolate the rpm beyond the 6350 limit.

[XfireZ51]

Phil,

Those injectors sound like a nice set for ur 402.