[sbsk518]

Originally Posted by _N54

It's back to the normal price now. It was always around $1800 for a 6 pack.

I paid 1400 last year.

[E90lmao]

Originally Posted by E93Dude

Am not disputing that 9's were probably the least reliable of the 12 iterations, but again - the price. Just for good measure, I had each of my ebay three-pack cheap-o used index 9s, cleaned/pressure tested at an injector repair place for $20/each and have one of them installed now and it runs fine. If it fails I don't care - just throw it away and put in another. Bit of a hassle, sure, but I have other things I'd rather spend $1,800 on than replacing all 6 with new OEM 12s. I guess I'm lucky that they are working without issue so far.

Was this a special injector shop or just a generic shop who happened to know to clean these out? I have a set of index 10s that I want to clean with my hydrosonic cleaner but I read that you have to run them in reverse to push the gunk out the threaded side. Otherwise you run the risk that the stuff you clean up just gunks up the interference fit within the nozzle and it just stay open. Is this true? I think they mentioned "back flowing through the injector"?

[E93Dude]

Originally Posted by E90lmao

Was this a special injector shop or just a generic shop who happened to know to clean these out? I have a set of index 10s that I want to clean with my hydrosonic cleaner but I read that you have to run them in reverse to push the gunk out the threaded side. Otherwise you run the risk that the stuff you clean up just gunks up the interference fit within the nozzle and it just stay open. Is this true? I think they mentioned "back flowing through the injector"?

This: https://www.injectorrx.com/


Dunking your injectors in an ultrasonic bath will clean them on the outside, but not really on the inside where it counts.

[stewbets]

Originally Posted by E93Dude

Am not disputing that 9's were probably the least reliable of the 12 iterations, but again - the price. Just for good measure, I had each of my ebay three-pack cheap-o used index 9s, cleaned/pressure tested at an injector repair place for $20/each and have one of them installed now and it runs fine. If it fails I don't care - just throw it away and put in another. Bit of a hassle, sure, but I have other things I'd rather spend $1,800 on than replacing all 6 with new OEM 12s. I guess I'm lucky that they are working without issue so far.

I'm right with you on dealing with a hassle versus spending $1800. And I got some injectors off of eBay that were functional. It's just that most of them seemed to leak somewhere between a little and a lot and the rising frequency of spun bearings was beginning to concern me. Regardless, I'd still be messing around with eBay injectors if a very generous forum member didn't sell me his old 12's super cheap.

[E90lmao]

Originally Posted by E93Dude

This: https://www.injectorrx.com/


Dunking your injectors in an ultrasonic bath will clean them on the outside, but not really on the inside where it counts.

Yeah that's what I figured, thanks!

[E93Dude]

Originally Posted by stewbets

I'm right with you on dealing with a hassle versus spending $1800. And I got some injectors off of eBay that were functional. It's just that most of them seemed to leak somewhere between a little and a lot and the rising frequency of spun bearings was beginning to concern me. Regardless, I'd still be messing around with eBay injectors if a very generous forum member didn't sell me his old 12's super cheap.

Damn near everybody in this forum needs an Index-12 sugar daddy…. Hypothetically, if I knew for a fact that I had no choice someday other than to pay for an outrageously prices set of 6 12s, I'd probably sell my car now.

[E90lmao]

Originally Posted by E93Dude

Damn near everybody in this forum needs an Index-12 sugar daddy…. Hypothetically, if I knew for a fact that I had no choice someday other than to pay for an outrageously prices set of 6 12s, I'd probably sell my car now.

There's so many people willing to dismiss anything aside from index 12s I found whenever I was looking at replacing mine, went for a set of 10s myself and fingers crossed they last me! Every post you read everyone is just copy pasting "index 12s or don't even both" i agree, if we absolutely had to go index 12 or nothing selling the car it is... in Canada a set of new index 12s would run $2300 CAD before taxes, duties and shipping, thats half what I paid for my e90 335.

[feuer]

Originally Posted by E90lmao

There's so many people willing to dismiss anything aside from index 12s I found whenever I was looking at replacing mine, went for a set of 10s myself and fingers crossed they last me! Every post you read everyone is just copy pasting "index 12s or don't even both" i agree, if we absolutely had to go index 12 or nothing selling the car it is... in Canada a set of new index 12s would run $2300 CAD before taxes, duties and shipping, thats half what I paid for my e90 335.

Yes, I agree. Many people that own n54, n54 or n63 engine vehicle aren’t on the forums. Many of them are still on index 1, 5 or 7. So the responses you will get on here will be repetitive. It’s given.

[Hoody007]

FWIW, the local dealer has the injectors for $441 retail! List is $330.

I can second that the index 9s are the worst. Have three 140K mile index 7s in, with no misfires. Two index 9s failed (cylinders 3 and 5). The third index 9 (cylinder 1) is still fine though. The 9s were installed by BMW under warranty…

Both failed injectors were replaced with 12s, but that's because I was wary of eBay injectors.

I read once that certain cylinders are more stressed somehow than others - is there any truth to this?

[E93Dude]

Originally Posted by Hoody007

FWIW, the local dealer has the injectors for $441 retail! List is $330.

I can second that the index 9s are the worst. Have three 140K mile index 7s in, with no misfires. Two index 9s failed (cylinders 3 and 5). The third index 9 (cylinder 1) is still fine though. The 9s were installed by BMW under warranty…

Both failed injectors were replaced with 12s, but that's because I was wary of eBay injectors.

I read once that certain cylinders are more stressed somehow than others - is there any truth to this?

Yes, cylinder 6 (nearest the firewall) seems to be where a lot of injector problems happen, probably because its hotter in that part of the engine bay, less air circulation.

Separately with the exception of one index-9, the rest of my injectors are all 1s. The progression of worst to best is not linear from series 1 to 12. BMW made engineering changes along the way to reduce manufacturing costs, with varying levels of success/failure. The index 1s were expensive to make because (I believe) they were cast in one piece. Later versions were two piece units that were welded together. I think 11s and 12s went back to that unibody style because it was a more reliable design.

If anyone knows better about this above, please correct me.

[TheMidnightNarwhal]

Originally Posted by E93Dude

Yes, cylinder 6 (nearest the firewall) seems to be where a lot of injector problems happen, probably because its hotter in that part of the engine bay, less air circulation.

Separately with the exception of one index-9, the rest of my injectors are all 1s. The progression of worst to best is not linear from series 1 to 12. BMW made engineering changes along the way to reduce manufacturing costs, with varying levels of success/failure. The index 1s were expensive to make because (I believe) they were cast in one piece. Later versions were two piece units that were welded together. I think 11s and 12s went back to that unibody style because it was a more reliable design.

If anyone knows better about this above, please correct me.

I'm curious to. Mine are all 9s and my number 1 is leaky a little bit.

I read similar things as well but in the end that all forum talk you know, no one links sources or links to show the info so I take it all with a grain of salt.

[E93Dude]

Originally Posted by TheMidnightNarwhal

I'm curious to. Mine are all 9s and my number 1 is leaky a little bit.

I read similar things as well but in the end that all forum talk you know, no one links sources or links to show the info so I take it all with a grain of salt.

Agree. I'm basing my comments off off of what I've read in this forum, and BMW service advisors. But frankly, Until Dr. Ing. Gunter von Unnötig Kompliziert, chief of the injector engineering section at Bosch coughs up the real story, this is all just us smokin' and jokin' on a cold morning at a Cars & Coffee meet...

[Sgop335]

Originally Posted by E93Dude

Agree. I'm basing my comments off off of what I've read in this forum, and BMW service advisors. But frankly, Until Dr. Ing. Gunter von Unnötig Kompliziert, chief of the injector engineering section at Bosch coughs up the real story, this is all just us smokin' and jokin' on a cold morning at a Cars & Coffee meet...

What does chief of injector engineering at Bosch has to do w our injectors?

[Technics_]

Check my index 12 injector ordeal thread for clarity but I paid $1945 shipped for the index 12 kit that includes the decouplers on 11/4/21.

Subtotal $1756.08
Shipping $22.99
Tax $166.81

Total $1945.88

[E93Dude]

Originally Posted by Sgop335

What does chief of injector engineering at Bosch has to do w our injectors?

He is a made up person. I was trying to be ironic by implying that nobody here really knows why BMW contracted for 12 iterations of injectors - only the engineers in Germany really understand. If you do a little googling on the made up name you will see a commentary on BMW's penchant for engineering things in a seemingly needlessly complicated way.....

[feuer]

Originally Posted by E93Dude

Yes, cylinder 6 (nearest the firewall) seems to be where a lot of injector problems happen, probably because its hotter in that part of the engine bay, less air circulation.

Separately with the exception of one index-9, the rest of my injectors are all 1s. The progression of worst to best is not linear from series 1 to 12. BMW made engineering changes along the way to reduce manufacturing costs, with varying levels of success/failure. The index 1s were expensive to make because (I believe) they were cast in one piece. Later versions were two piece units that were welded together. I think 11s and 12s went back to that unibody style because it was a more reliable design.

If anyone knows better about this above, please correct me.

Cylinder 5 would be the hottest and I believe experience most knock but neither directly linked with why injectors fail. Number one reason is probably not driving the car. I have been replacing many injectors. Currently own two n54, down from three, and also work on other people n54s. All revisions of these injectors are machined. Not cast. All revisions, not only on these injectors, but in general, are made to be cheaper than what they are replacing. Index 1 and 2 have same body with machined 3 mounting tabs. Rest have welded on tabs which are know to break off with ease in mid index revisions. All are made from few machined pieces assembled together. There are 4 or 5 different bodies. We mostly care about the piezo elements which are on the inside.

[Sgop335]

Originally Posted by E93Dude

He is a made up person. I was trying to be ironic by implying that nobody here really knows why BMW contracted for 12 iterations of injectors - only the engineers in Germany really understand. If you do a little googling on the made up name you will see a commentary on BMW's penchant for engineering things in a seemingly needlessly complicated way.....

I figure the irony, was pointing out Bosch not him or his name.. I Understand that ppl dont care too much about the facts around here but it is siemens vdo or guess is continental now not the same company as bosch.

[E93Dude]

Originally Posted by Sgop335

I figure the irony, was pointing out Bosch not him or his name.. I Understand that ppl dont care too much about the facts around here but it is siemens vdo or guess is continental now not the same company as bosch.

I was trying to make a simple joke, so no need to over analyze it. I do care about facts here, so if Siemens or Continental were the original manufacturers of the injectors, then I stand corrected.

[Saif2018]

Jist ordered a set of Index 12 Injectors, nearly £1500 🤦

https://www.mlperformance.co.uk/prod...fe338ba5&_ss=r

[haaken675]

If I didn't have so much money dumped into my e92 I would probably cut my losses and look into a different car with the pries of injectors going so high.

[stewbets]

Originally Posted by E93Dude

I was trying to make a simple joke, so no need to over analyze it. I do care about facts here, so if Siemens or Continental were the original manufacturers of the injectors, then I stand corrected.

I liked your joke.

[Saif2018]

Originally Posted by Soden82

My friend let me borrow his Autel MX808 or whatever model it is. Saved me so much time and money. Might buy one for myself

Buy Protool app, it's more extensive and doesn't cost several hundred dollars or pounds.