engine and drivetrain Interested in tii injector testing feedback

[wegweiser]

The machine shop we use for our machining of engine internals has the ability to test high pressure gasoline and diesel injectors. I'm thinking about having my spare set tested and / or cleaned.

1) I'm wondering what the failure rate really is on these - I've heard they're virtually indestructible if treated with respect

2) Going rate for testing service? $$?

3) Was it worth it - any performance improvement?

The above machine shop is also a magical place where 5 foot high PILES of Kugelfischer-looking diesel pumps await rebuilding and 6 foot long crankshafts get machined and straightened. They do everything from diesel barge engines (engine blocks larger than the body of an average SUV!) to cylinder head machining and aircraft parts tooling.

I'd like the peace of mind of knowing the injectors in the F Bomb are good, but don't want to recklessly spend cash I don't really have.

Opinions?

[VintageAutobahn]

The Bosch diesel fuel injection repair shop that I take my injectors to for testing does it for free, the owner tells me to bring him some work when I buy a diesel. I think some of the "Kugelfisher guru's" charge around $15 per injector for testing.

Of the 20 or so injectors I have had tested all but a couple have been usable.

[MikeWooldridge]

I've had probably 16 tested, and maybe two were "bad", meaning they lost spring tension, and didn't "mist" properly, although were still useable. The biggest problem according to the folks I use is a bad pintle, which they can resurface. I'd say 90% will test OK unless the inside is rusted badly, causing the spring to lose tension.

Cost can run from $0 to $8, depending on what they do to it. Arkansas BOSCH repair facility. They really don't like to fool with these, but will if you work with them on the timing. I actually watched the operation.

[wegweiser]

Well... Dayum! If it's THAT cheap - that makes it a no brainer! I've had four injectors sitting in a baggie soaking in penetrating oil for about a year....just to keep them from corrosion in storage.

Thanks all!

[oldguy]

diesel kfish type pumps and gas kfish pumps are completely different. A diesel pump runs at about 1200-1700psi. A gas one makes 450-500psi on a good day.

[wegweiser]

diesel kfish type pumps and gas kfish pumps are completely different. A diesel pump runs at about 1200-1700psi. A gas one makes 450-500psi on a good day.

That doesn't surprise me at all. It's just so alien to me, to see mechanical fuel pumps stacked in great big piles! They have turbos larger than a 19" BMW road wheel, laying around the place, too. I'll have to get photos next time I go there.

[lilmo]

You're local diesel guy can probably tell you if the injectors leak and approximately at what psi they open. Send the injectors, your pump and a bunch of $ to PAR, PFI or the like if you want the real deal.

I would be curious to hear how a brand new injector would test out at a diesel shop, and how that would compare with some of the old ones I've had checked.

[wegweiser]

We've sent several 300SL pumps and their injectors to Gus, et al... he does beautiful work!