Flat6 Innovations

I have tried every brand of rebuilt injector. We have also had local shops specializing with injectors work with them. The results have never been the same as a new injector. We've tested them back to back, and I've even ran tests where 1 bank of the engine has new injectors, and the other has rebuilt. The differences in fuel trim were notable, as well as the rough running index on each bank.

The bigger issue with rebuilt injectors lies in the fluid that was used to clean them, and how long they have been on the shelf. As part of what we do, we work with wholesalers of parts that are having issues with products. A couple of years ago one company lost a lot of money selling rebuilt injectors due to warranty issues. I was asked to figure out the issue and it was determined that the fluid that was being used had a shelf life in the injector of 30 days, after that period it would actually begin to corrode the injector internally.

That said, cleaning and "rebuilding" injectors is done in a lab environment. The injector is being tested in a perfect scenario. Put that perfect injector on a hot engine that has just been shut down, and see if it will hold 60 PSI of dead headed fuel pressure without bleeding down overnight without puddling fuel in the intake ports and cylinders that have open intake valves. Give it a shot. Injectors have been fighting us for 5 years, and when I recommend to you to replace them with new units, this all comes from direct experience, pain, and suffering.

Imo000

Jake is right. You can not rebuild these and most fuel injectors from the last 25+ years. Physically not possible! They are "refurbished" by cleaning them (internally and eternally), then new external hardware is put on (pintle cap and O rings) and are then painted to look new. The internal moving parts are just as worn as then were before. If a company uses the word rebuilt, they are lying. Yes, most flow test them and then they take the 6 closest flowing injectors and send them to you as a set. Often this means that these injectors came form different engines. You have no idea what you are getting other than they are a "flow matched" set of old injectors that look new.

Byprodriver

Who said that ?

TexSquirrel

I've run into problems using rebuilt injectors in BMW engines.
Sure they sprayed fine, made great power, and solved misfire issues.
But they also leaked while setting.
They leaked up to the point of hydro-locking engines that sat very long.
Now I only use new injectors, especially in anything that is not daily driven.

Flat6 Innovations

Yep, what he said.

Which is THE problem we are trying to avoid. Fuel is solvent, puddling that up in the bottom of a cylinder leads to wear, and fuel intrusion. I have stories about this that would go on for days, including a paid technical consultation for a supplier of engines that had a dozen issues with new engines after the old engine had failed from bore scoring. The replacement engines started showing odd symptoms upon installation, and that was traced back to the same cylinders that failed previously. Luckily the core engines went through a photo documented teardown. The common denominator was the fuel injectors remained in their same locations, feeding the same cylinders with both engines. This was as conclusive as it gets, and well documented.

Porschetech3

Why not just use the 996.2 injectors? The 996.1 injectors are EV-1 (0280150470) and flow 229cc/min, the 996.2 EV-6 (0280156053) flow 249cc/min that's a difference of just 9%. And if using Ethanol laced fuel (E10),it requires 6.3% more fuel than pure petrol, it will be closer to Lambda 1 (0 trim) than if using the EV-1 stock injectors and pure petrol.

Usually I see trims running +5-+6 % when running Ethanol laced fuel. The DME can adjust +- 10% LTFT and =- 10% STFT and will set CEL if a +- 25% is reached.

The EV-6 and EV-1 are the same length, connector, and o-ring size and Ohm (12).. The EV-6 has a better spray pattern and runs cooler.

The 0280156053 flows only 20cc/min more ( 249cc/min vs 229cc/min) than the 0280150470 and would even be better suited for E10 on the 3.4 engine.

Since the price is SO much different, seems putting EV-6's in the 3.4 would be worth it, I'm sure Jake has done this, comments Jake?

The 3.4 doesn't suffer from bore scoring as much as it's big brothers, but uneven or leaking injectors can certainly cause this issue.

That 996.2 injector 0280156053 249cc/min is also used in the 2.7 and 3.2 986 from 01+

TexSquirrel

I got confirmation from Warehouse33 that the 996.2 Bosch fuel injectors they sell are new.

Flat6 Innovations

808Bill

Jake, I'm glad you're back on the forum! Thank you for the education...

Flat6 Innovations

Paul Waterloo

Jake's, thanks so much about saying that the 996.2 injectors would work with a modification. I would rather have new and truly appreciate you making a video on how to modify him to go into the fuel rail.

Bash Hat

AnthonyGS

Porschetech3

Both the EV-1 and EV-6 mentioned in my post use the Bosch Jetronic/Minitimer connector , commonly referred to as just the EV-1 style connector.(not the USCAR connector knucklehead )

EV-1, EV-6 and EV-14 are Bosch injector "body" styles, not connector types.

Bosch even makes the EV-14 in the "standard " length ( EV-1 replacement)with flow rates up to 1000cc/min with the "EV-1 style Bosch Jetronic/Minitimer connector."

BTW the flow rate is 3 Bar for these specs.

danielcooper9

Jake, Do you recommend using the same injectors when rebuilding a 3.6 to 3.8 or do they change?