I think we're talking at cross puppies. :) The injectors on my Kwacker are totally strippable. You can disassemble everything bar the electrical switching jobbie. I've looked at the cross-section and it is radically different to the ones on my bike. On my injectors there's a grub screw that turns about three turns out - this allows the body to unscrew and pull away so as to allow access to the internals which can then be removed. You can (or you used to be able to anyways) get a little rebuild kit with o rings and replaceable components to service it with. The grubscrew locates into the top of the threaded body which has a slight dimple in it. This is so that you know the o ring is sufficiently compressed to seal the unit properly.

Externally the unit looks like any other Bosche affair. The onboard computer and airmeter are Bosche - I'm assuming the injectors are too but I could be wrong - it may be a Kawasaki made unit.

Admitedly the bike injectors are the only ones I've actually had experience of pulling apart - like I said I believe the Porsche units are all sealed. When I last had cause to 'rock' them (is that the same as backflushing?) I don't recall seeing any way to pull them apart - although they looked very similar to the Kwacker units.

There could be a good reason why Kawasaki fitted serviceable injectors. In 1980 Kawasaki brought out the very first commercially manufactured fuel injected motorcyle - the KZ 1000 - H. Shortly after that they also brought out the GPZ 1100i and the KZ 1300 D Kawasaki have always been refreshingly good about using as many common components as they could throughout their range - making life much more simple for those who spanner on their bikes. It's possible they made the injectors strippable in order to interchange them with the afore mentioned bikes with only a few slight changes in the nozzle internals.

Well I just talked with the RCEngineering tech (possibly owner) and he says they "balance" the injectors. When I pressed him on this balance thing he admitted that they do not take the injectors apart they just clean the heck out of them. This brings the injectors back to within 2% of each other and thus they are "balanced".

Pure BS! You might as well have some one just clean a set at $50 than spend $28 each for the same service.

However he also admitted that they can take one of the Bosch injectors apart once and change the insides for custom applications (read Big Buck$ here). He was adamant that this is NOT the $28 service.

If an injector is found to be uncleanable, such as a leak at a seam, it is returned to the customer with a note.

Thus they do not rebuild injectors. They clean and flow test providing a graph of their findings.

...uhmmm I'll have to disagree with you Socal.

Injector cleaning is not as simple as using some carb cleaner and blowing air through them. Injectors generally do not fail mechanically but rather microscopic debris/ additives in gas etc accumulate and affect the flow patterns of injectors....

The choice of solvents and frequency of ultrasound to use is not what I would consider a back yard mechanic to have access to. So injectors that are cleaned (rebuilt I guess you could call it that) are adequate especially when you are looking at $80/injector and higher in other cars (150 in my friends landrover). So for a ~30-50 bucks to be cleaned right and having a set that is documented to flow at a certain spec I would think would be more than adequate.

.... on side note: most of the industry uses the term rebuilt when it comes to cleaning injectors not just highboost951.....heheheh... The definition seems to be implied as long as the part is returned to OEM spec regardless if you can slice it open and see the parts for yourself...

You will not find the word "rebuilt" on either of the listed web sites in regards to the Bosch 944 type injector.

These guys up here managed to send out a bosch injector to be rebuilt? But what do they know?

Check step number 19....

http://www.pcaucr.org/pcaucr/site.nsf/Public/321d3231a7906d568525694000007ffa

Ignorance is bliss. Most call it a motor. A few others it's correct term; engine.

Then a crap pile of money makes everything ducky.

Okay, I should bite my tongue but....I can't, I'm young and weak...okay, I'm going to say it...Socal, I don't think anyone really gives a **** other than you. You must have a lot of spare time on your hands to be worried about the "rebuilt" fuel injector conspiracy, especially after hearing that you took the time to give RC' the shakedown and waste theirs.

damn censorship

So you don't think that the 944 consumer should know what they are really getting for their money?

Cleaning the injectors is something most can do at home as long as they have a two or three foot piece of tubing, some solvents and a compressor.

This saves at the minimun $50 if not $120 minus the $12 for the four o-ring kits. May not be 99.9% but I'll bet that no one here can tell the difference between the two methodes.

first off thanks for not killing me after that post!!! it was a mix of humor, stress relieve, and a bit of stab. I think we're justing kinda pissing in the wind here but oh well.
Regarding my stance on informing the 944 consumers...I think you know the answer to that; I recall saying that buying new ones would be a waste of cash since having them "rebuilt" would give the same results at a fraction of the cost. The majority of my posts are answering questions, not asking them.
I'm still puzzled at what your trying to accomplish. When you were cleaning the injectors back in the '70's, those were manual CIS and MFI injectors. You're forgetting the need to electrically open the 944 injector. I'd be careful what you're suggesting others to do, let's look at your recipe for disaster, compressed air(lots of oxygen), combustable liquids/gases, and electricity/possible sparks.

You make a very good point about how no one would be able to tell the difference, even yourself. This is funny because that's exactly the problem, do you think the typical 951 owner who blew his headgasket from running lean "knew" that one of his injectors wasn't quite up to par but continued to flog it anyway?
A ping is pretty easy to hear and correct on a n/a motor; a simple band-aid is higher octane. The turbo is different story, hearing ping on a turbo when you're already using high octace fuel is a little more scary, burnt valves and blown headgaskets come to mind.

Ultrasonic cleaning, according to the Society of Automotive Engineers, is the most effective and safe cleaning method. You couldn't even compare spending your method at $12.50 to the value of spending $55 total to achieve factory spec and within 2% of one another.

When trying to tune a motor using a/f ratios and running increased fuel pressures and bigger injectors, it's a necessity to have matched injectors, otherwise as I said earlier, you're pissing in the wind. typically readings are combined from all cylinders, or an average, in turn with w/o matched injectors the same thing happens on tuning, if one is not up to par, it pulls down the overall A/F ratio, then the others are ran even richer to cover the bad one. see this being a problem? It's not just turbos that I'm talking about either.

If the whole world was just driving '83 944's w/o mods or seeing track use then....it's not a perfect world either.

Back pressure will open the Bosch electro magnetic injectors.

Yes our Bosch injector is basically mechanically the same injectors as are used in the 1970's VW's. They are not the CIS or MFI.

1970 VW-Bosch injector

You can tell how rich or lean a cylinder is running from the spark plug.

If it suits someone's need then have the injectors professionally cleaned then do so. I'm pointing out that this is NOT rebuilding as the injectors are never disassembled. I would not call replacing the strainer screen rebuilding.

The "balancing" is erroneous too. When you send your injectors to be cleaned the service will test the flow rates after the cleaning and give you a sheet showing how each injector performed. It's up to you to match up a set of injectors.

The turbo has a knock detector and will retard the timing.

SO Cal Driver, Im getting ready to pull my injectors out and clean them on my own. Can you tell me how YOU do it. I have all the tools you speak of and would like to try it myself first. The car sat for 3 years without being started now after flushing the fuel system it running crappy. Think the injector Cleaning would help alot. Have replaced the fuel pump.