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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Best way to test injectors for flow?



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      11-11-2018, 05:22 PM   #1
JonEQuest
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Best way to bench test Injectors?

I am putting my car back together after a rebuild and want to make sure I have everything working right. I want to test the injectors before putting them back in the head. I have a mix of three index 2 and three index 8 injectors so I really want to make sure these older ones are working right so I don't ruin a fresh engine. I bought the car with a bent rod so for all I know I have a bad injector that caused detonation or even leaked down and hydalocked it at one time. Checking for leak down will be easy but I am not sure how to test volume and spray pattern.
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      11-11-2018, 06:11 PM   #2
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Save yourself headache and get index 12
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      11-11-2018, 09:29 PM   #3
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Quote:
Originally Posted by FEDE/E92 View Post
Save yourself headache and get index 12
Just buying several hundred dollars of injectors would be an easy fix but I don't have several hundred extra dollars laying around. So I need to test these and make sure they are functioning properly and none are low flowing.
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      11-12-2018, 03:31 AM   #4
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You'll be wanting a set of 12s, even if they function right now, the likelihood that they wont soon is high and the risk you speak about regarding the new engine is the same.
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      11-12-2018, 08:30 AM   #5
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Quote:
Originally Posted by MJ80. View Post
You'll be wanting a set of 12s, even if they function right now, the likelihood that they wont soon is high and the risk you speak about regarding the new engine is the same.
I do plan to replace them eventually but the only replacement options I see are about $1,200 or buying from questionable sources. So for now I need to test the ones I have to make sure I don't have a weak or partially clogged one.
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      11-12-2018, 01:34 PM   #6
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Show us pics of what you got.

Be prepared to put new seals on, at a minimum.
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      11-12-2018, 02:01 PM   #7
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Quote:
Originally Posted by FCobra94 View Post
Show us pics of what you got.

Be prepared to put new seals on, at a minimum.
I've already ordered new seals. mine are a mixed bag of index 2 and index 8. This is the order they were in my car.
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      11-12-2018, 03:12 PM   #8
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The pic is hard to tell what condition the tips are in..."leaky" injectors are pretty easy to tell by looking at them = if the entire tip is black with soot and smells like fuel, then you got a leaky injector.
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      11-15-2018, 01:03 AM   #9
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I recently changed all my injectors to Index-12. The old injectors didn't have any issues with leaking or anything. They all are still working great. I just wanted to upgrade to prevent any future issues. They're a mix of Index-7 and Index-8. If you end up needing any, let me know if you are interested.
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      11-15-2018, 01:13 AM   #10
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Quote:
Originally Posted by N5ifty4our View Post
I recently changed all my injectors to Index-12. The old injectors didn't have any issues with leaking or anything. They all are still working great. I just wanted to upgrade to prevent any future issues. They're a mix of Index-7 and Index-8. If you end up needing any, let me know if you are interested.
OK, I will.
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      11-15-2018, 08:06 AM   #11
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Quote:
Originally Posted by FCobra94 View Post
The pic is hard to tell what condition the tips are in..."leaky" injectors are pretty easy to tell by looking at them = if the entire tip is black with soot and smells like fuel, then you got a leaky injector.
#2 from left to right. Side tip is bent up, meaning is possible it was pushed in too deep into the head. I would replace it.
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      11-17-2018, 11:33 PM   #12
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Quote:
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Quote:
Originally Posted by FCobra94 View Post
The pic is hard to tell what condition the tips are in..."leaky" injectors are pretty easy to tell by looking at them = if the entire tip is black with soot and smells like fuel, then you got a leaky injector.
#2 from left to right. Side tip is bent up, meaning is possible it was pushed in too deep into the head. I would replace it.
I need to look at that one closer.
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      11-18-2018, 12:11 AM   #13
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Quote:
Originally Posted by JonEQuest View Post
I need to look at that one closer.
I have few index #1 with new seals if you need some. Also maybe index 6 or 7. Need to check
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      11-22-2018, 03:09 PM   #14
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Quote:
Originally Posted by feuer View Post
Quote:
Originally Posted by JonEQuest View Post
I need to look at that one closer.
I have few index #1 with new seals if you need some. Also maybe index 6 or 7. Need to check
I will let you know. Thanks.
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