Hi: Time for new injectors. Started to look at them on ebay and saw all different pound measurements. 19, 22, 24, etc. What's the difference? What would you suggest for a 1985 with 120,000 mies on it? Thanks

 

Contact John at the Fuel Injection Connection. He will steer you in the right direction for your needs. He is very helpful and really knows his stuff when it comes to FI.

Steve

 

Jon is "Da Man" when it comes to injectors.

 

You have the pick the right size, patvette. If not, the car won't run right.

Jon will be able to give you the option of new vs rebuilt (ultra-sonically cleaned) injectors. The later provides quite a savings and are guaranteed.

Many, many people are happy with the Bosch III rebuilt units. If/when a few people have an issue, Jon works way harder than any other company to resolve any issue. BTW..."any other company's" customer service is zilch, nada, non-existent, worthless, laughable, not-worth-while. OTOH, there are people happy with that!

 

I'll 4th that opinion! Jon is the only guy to deal with if you need injectors.

 

It has been said before but John at FIC is the best way to go.
Put a set of Bosch III's on my 1990 and it was the best deal I have gotten in a long time.
Fit, Form, Function, and Price he is second to none.

 

I got a set of injectors from him in my F-150. Fair price, quick shipping, and good to deal with. He really is the go to guy for injectors in the Corvette world as well as other circles. A friend of mine mentioned him the other day in reference to his extremely highly modified Eagle Talon. I never had reason to mention him so I guess he heard about him on the DSM forums.

 

Then its unanimous, John is the man for injectors.

The reason why I felt I need them is that I posted a problem here a few months ago and injectors were one of the possible solutions. It seems the 85 starts in a split second when cold. After a 15 minute drive, a quick run into a corner store and then it is about 10 seconds of cranking to restart. Someone suggested that it might be fuel seaping out from around the injector(s). Plausible, or maybe something else?

 

It is a possibility but there are other things that can cause that as well. A cheap fuel pressure gauge will tell you if your injectors are leaking.

 

I too have Bosch III FI from John.
I bought a new set from him about a year ago.
They are really worth the money (the rebuilts too!) and the service is just perfect.
He could sell them at a way higher price and I would still buy from him.

I´d always buy again! You can´t go wrong.

 

What a ditz I am! I should have posted the problem first and asked for a diagnosis, instead of jumping to conclusions. So, what else might my problem be?

 

it sounds basically what happened to my 89. When cold (in open loop), car ran fine, then when warmed up, (going into closed loop 130 -140 degrees F), it would run rough. The ethanol in the fuel ruins these stock Multec injectors. Jon IS the Man. Worked for me...

 

Have you measured OHMs for the injectors? Especially when hot?

Compare hot to cold values. If consistent, measure fuel pressure hot and cold.

Or just do both.

 

My 85 was having the same problem with the stock injectors. A quick call to Jon at FIC and he set me up with a set of Bosch III's to match the stock units, I didn't even have to change the fuel pressure regulator. I swapped them out and the problem is gone. Now it starts up everytime with a quick turn of the key, I barely hear the starter turn anymore, and the car runs like a bat out of hell.

FIC has the best customer service of any vendor I have ever dealt with! I mean what other vendor would give you their personal cell phone number to call if you had a problem?

With the mileage you have accumulated on your injectors, they need to be serviced. Its possible something else could be causing your problem, but most lilkely, its an injector sticking open. There's a simple test and if I missed something, I'm sure one of the guys here can chime in. When the car is warm and won't start, hold the gas pedal to the floor and see what happens. If the car starts, then its the injectors. If not, then it could be something else. Guys, does that sound right?

You can get the original injectors cleaned and matched, but it takes time to remove, send them out to be cleaned, wait for thier return and then reinstall. Don't bother with getting them cleaned while still in the car like from a place like Jiffy Lube, etc. It works for a little while then you're back to square one. A set of new injectors can be installed in an afternoon if you are mechanically inclined and we're here to help you if you hit a snag (I photo-documented my install).

 

Yes, I will call John, but I do like to understand everything first, in case I run into the same problem again, or in case I can help out someone else with a similar problem.

So, I googled my original question of what the different pound thing is. It may be english to you, but holy crap it might as well be german to me. Can someone simplify it for me or is it already simple enough. Unfortunately, I think I already know your answer.

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So, how much power is this injector good for? That depends on the air/fuel ratio that is used, but a good rule of thumb is to divide this flow figure by 5 to get a hp capability. So, 322cc divided by 5 = 64hp maximum fuel flow with this injector. If you want to be pedantic, it's the mass of the fuel (not the volume) which is the critical factor. Assuming a "normal" fuel density, the mass of the fuel in pounds per hour can be worked out by Dividing the cc per minute figure by 10.5. For this injector, that gives a mass flow of 30.6 pounds/hour. To convert from pounds/hour to horsepower capability, multiply the figure by 2.04. So 30.6 pounds/hour multiplied by 2.04 gives a horsepower capability of 62.4hp - the same as we got from the cc/minute figure.
The power ratings discussed above are for each injector. This means that you need to multiply this rating by the number of injectors that are to be used. So, if you were using the Impulse RS 322cc injectors in a 4 cylinder engine (with one injector per cylinder) the max power that the injectors could deliver fuel for would be about 249.6hp. All of these figures are assuming that you are running an average fuel pressure of ~43psi and at 90% duty cycle.

Conversions
500cc per minute is approximately equal to 49lbs per hour which is equal to approximately 100hp.
lbs/hour = cc per minute / 10.5
lbs per hour = HP / 2.04
cc per minute = lbs per hour x 10.5
cc per minute = HP x 5
HP = cc per minute / 5
HP = lbs per hour x 2.04

 

otay, da mo powa you make da bigga injeta ya nead... "Talk to Jon"
http://fuelinjectorconnection.com/shop/

 

DUH, I get it now! Thanks for the simplified answer. I have stock and stock is what I should go for. Sheesh,

 

Just messing with ya