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Thread: Piston wear

  1. #1
    Senior Member Three Rings Van Black's Avatar
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    Piston wear

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    Hello,

    Would you replace the pistons for this wear if it was yours?


    First is from one side, second is the other side. They all look more or less the same
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  2. #2
    Veteran Member Four Rings aluthman's Avatar
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    Pics aren't working.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
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  3. #3
    Veteran Member Four Rings brandonpham's Avatar
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    Quote Originally Posted by aluthman View Post
    Pics aren't working.
    https://www.flickr.com/photos/van-bl...posted-public/

    https://www.flickr.com/photos/van-bl...posted-public/

    If you're pistons are out or that close to accessible, why not upgrade?

  4. #4
    Veteran Member Four Rings aluthman's Avatar
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    Clean the pistons up good and take the rings out. You need to use a feeler gauge to measure and see if there is wear in the ring lands. I think I listed the specs in either the Engine build info thread or in my DIY. The coating worn off the skirt is no big deal as long as there are no rough scuffed areas or scratches/gouges. It would be a good idea to get the skirts recoated before reinstallation though. Swain Tech does it for $20/piston.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  5. #5
    Veteran Member Four Rings aluthman's Avatar
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    Found it:

    Quote Originally Posted by aluthman View Post
    Just found all the info I needed in some stuff I got from Mec a while back. Here it is for anyone else that may need it, and keep in mind that all the measurements are in mm and not inches.






    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  6. #6
    Senior Member Three Rings Van Black's Avatar
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    Quote Originally Posted by brandonpham View Post
    https://www.flickr.com/photos/van-bl...posted-public/

    https://www.flickr.com/photos/van-bl...posted-public/

    If you're pistons are out or that close to accessible, why not upgrade?
    Upgrades aren't really available in Europe a lot. Plus, I'm not looking for crazy power out of this car, it's my DD
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  7. #7
    Senior Member Three Rings Van Black's Avatar
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    Quote Originally Posted by aluthman View Post
    Clean the pistons up good and take the rings out. You need to use a feeler gauge to measure and see if there is wear in the ring lands. I think I listed the specs in either the Engine build info thread or in my DIY. The coating worn off the skirt is no big deal as long as there are no rough scuffed areas or scratches/gouges. It would be a good idea to get the skirts recoated before reinstallation though. Swain Tech does it for $20/piston.
    Thanks a lot for the info Adam. The pistons look quite good, just the coating's off. I'll have to see if I can find someone who does teflone coating where I'm from
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  8. #8
    Veteran Member Four Rings aluthman's Avatar
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    Yeah I totally missed the part about you being in Europe.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  9. #9
    Senior Member Three Rings Van Black's Avatar
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    Well then: crank main: ~53.97 all of them, crank rod: slightly above 47.76, pistons: 82.445 -> 82.45, rings: about 0.5 gap, engine bores: 82.52 ish
    Very odd, I'll have to check the valves next. My compression was about 9 bar. Can't see anything wrong yet
    Last edited by Van Black; 10-08-2016 at 07:04 AM.
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  10. #10
    Veteran Member Four Rings Denio24's Avatar
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    Quote Originally Posted by Van Black View Post
    Well then: crank main: ~53.97 all of them, crank rod: slightly above 47.76, pistons: 82.445 -> 82.45, rings: about 0.5 gap, engine bores: 82.52 ish
    Very odd, I'll have to check the valves next. My compression was about 9 bar. Can't see anything wrong yet
    These engine wear quite well on a stock tune, until they get upgraded. My cylinder #1 piston's ring lands basically disintegrated and I'm happy that it didn't cause more damage than it did. Definitely upgrade the pistons since you have them out already. Since you're in europe, looks for an engine code BGB. Those are factory forged pistons that are quite readily available in europe from any junk yard.
    Garage: 2008 Quartz Gray Audi A4Q 6MT
    Tuning: JHM Tuned Stage 2 93 Octane w/ IE HPFP

  11. #11
    Senior Member Three Rings Van Black's Avatar
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    Quote Originally Posted by Denio24 View Post
    These engine wear quite well on a stock tune, until they get upgraded. My cylinder #1 piston's ring lands basically disintegrated and I'm happy that it didn't cause more damage than it did. Definitely upgrade the pistons since you have them out already. Since you're in europe, looks for an engine code BGB. Those are factory forged pistons that are quite readily available in europe from any junk yard.
    What tune where you running? The pistons I have seem to be forged as well, they're missing the cast lines. My code is BWE
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  12. #12
    Veteran Member Four Rings Denio24's Avatar
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    Im running the jhm stage 2+ tune with the upgraded fuel pump and stock k03 turbo

    Sent from my SM-G920P using Tapatalk
    Garage: 2008 Quartz Gray Audi A4Q 6MT
    Tuning: JHM Tuned Stage 2 93 Octane w/ IE HPFP

  13. #13
    Senior Member Three Rings Van Black's Avatar
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    Quote Originally Posted by Denio24 View Post
    Im running the jhm stage 2+ tune with the upgraded fuel pump and stock k03 turbo

    Sent from my SM-G920P using Tapatalk
    K03 held up to that? how long have you been running it and how many ponies?
    I'd go for a HFC, FMIC and K04 hybrid on a Revo tune, don't really know what stage yet TBH, maybe the uprated HPFP internals as well.

    It's scarry to hear that the piston breaks from something like a stage 2
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  14. #14
    Veteran Member Four Rings Charles.waite's Avatar
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    Is BGB the higher power Euro-DTM engine?

    Also, pics embedded for posterity:



    -CP
    2008 2.0t S-Line Ti 6MT Avant
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  15. #15
    Veteran Member Four Rings aluthman's Avatar
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    I think that is BUL.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  16. #16
    Veteran Member Four Rings Charles.waite's Avatar
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    ETKA shows BUL, BYK, BPJ,BGB, BWE, BPG, and BWT all sharing the same current piston part number: 06D107066AB. The only outlier is the early 2006 and 2005 models have the crowned pistons which still lists as part number: 06d107066d.

    I have some doubt there as we all know that those early engines are ALL BPG here in the US and had the crowned pistons, and that the later engines here in the US are ALL BWT and have the flat pistons. So to restate this so that it makes, likely, more real world sense:

    If you had a crowned piston engine (early 2.0t, likely BGB and BPG) then you need to stay on the crowned piston track which currently ends at 06d107066d.

    If you have a flat piston engine (BWE and BWT) then all roads lead to: 06D107066AB.

    BUL, BYK, and BPJ, I can't really comment on as I'm not particularly knowledgable on (other than the BPJ is a transverse engine from A3s, GTIs and passats here in the US) other than those part successions all lead to 06D107066AB also.

    Now, part numbers aside, its really hard to know what construction methods were used for each and every part number unless you have an example of each part number to examine. There have been a ton of piston revisions (especially for the flat pistons) over the years so its very possible that X revision is forged and Y revision is cast. But ETKA won't tell you any of that information unfortunately.
    -CP
    2008 2.0t S-Line Ti 6MT Avant
    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
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  17. #17
    Senior Member Three Rings Van Black's Avatar
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    Adam's right, the 220 is a BUL, all other sn's are 200bhp, for Audi non sport versions. The code Charles listed is great, except guess what: it changes to the new revision, cast piston. I've already
    tried to buy new ones....
    On a side note I got lucky and managed to score a set of crowned forged BGB pistons. And that leads me to ask a dumb one: they're a direct swap, right? They seem a bit taller so I feel
    I should ask if everything else is the same. The seller is passing them on with rods and all as well.

    BTW how in the hell do you embed pictures on this site?
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  18. #18
    Veteran Member Four Rings aluthman's Avatar
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    Yes, they are a straight swap. Your compression will go up however, since the crowned pistons were in 10.5:1 engines and the dished pistons were 10.3:1.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  19. #19
    Veteran Member Four Rings Charles.waite's Avatar
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    Quote Originally Posted by Van Black View Post
    Adam's right, the 220 is a BUL, all other sn's are 200bhp, for Audi non sport versions. The code Charles listed is great, except guess what: it changes to the new revision, cast piston. I've already
    tried to buy new ones....
    On a side note I got lucky and managed to score a set of crowned forged BGB pistons. And that leads me to ask a dumb one: they're a direct swap, right? They seem a bit taller so I feel
    I should ask if everything else is the same. The seller is passing them on with rods and all as well.

    BTW how in the hell do you embed pictures on this site?
    I've heard the crowned pistons were generally (maybe all??) forged, but the flat/dished pistons were cast from everything I've read/seen. Adam was it you that machined down the crown on yours??
    -CP
    2008 2.0t S-Line Ti 6MT Avant
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    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
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  20. #20
    Veteran Member Four Rings aluthman's Avatar
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    Yes, I had the crowns milled off to make a flat piston. This dropped the compression to right around 9.5:1. Since all I did was take the crowns off, the pistons strength shouldn't have changed much since the thinnest part is in the center and that part was left untouched. The car runs great with them.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  21. #21
    Veteran Member Four Rings Charles.waite's Avatar
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    Less reciprocating mass too. Win win.
    -CP
    2008 2.0t S-Line Ti 6MT Avant
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    Former USP CLUB MEMBER #136
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  22. #22
    Senior Member Three Rings Van Black's Avatar
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    Quote Originally Posted by aluthman View Post
    Yes, they are a straight swap. Your compression will go up however, since the crowned pistons were in 10.5:1 engines and the dished pistons were 10.3:1.
    Thanks for the feedback. Are you sure it's not the other way around? Crown 10.3/1 and dish 10.5/1.
    I've checked autodata and it gives me 10.5 CR for BWE engine
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  23. #23
    Veteran Member Four Rings aluthman's Avatar
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    Maybe there are different versions for the dished pistons, but the crowned ones are definitely 10.5:1, at least here in the states.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  24. #24
    Active Member One Ring
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    Hi guys. we are talking crown pistons vs flat pistons... Are these interchangable? I have the 06d107066d but the replacment parts i got is 06d107066c (flat top) . Can i use these without chainging the comp ratio? And if you do end up getting lower comp ratio due to flat psitons, do we need to follow up with programing the car for that ? or he car will run he same ?

  25. #25
    Veteran Member Four Rings aluthman's Avatar
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    Quote Originally Posted by kamikaze_85 View Post
    Hi guys. we are talking crown pistons vs flat pistons... Are these interchangable? I have the 06d107066d but the replacment parts i got is 06d107066c (flat top) . Can i use these without chainging the comp ratio? And if you do end up getting lower comp ratio due to flat psitons, do we need to follow up with programing the car for that ? or he car will run he same ?
    Yes, no, no, yes.
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  26. #26
    Veteran Member Four Rings Theiceman's Avatar
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    Lol


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  27. #27
    Senior Member Three Rings Van Black's Avatar
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    Quote Originally Posted by kamikaze_85 View Post
    Hi guys. we are talking crown pistons vs flat pistons... Are these interchangable? I have the 06d107066d but the replacment parts i got is 06d107066c (flat top) . Can i use these without chainging the comp ratio? And if you do end up getting lower comp ratio due to flat psitons, do we need to follow up with programing the car for that ? or he car will run he same ?
    They're interchangable, I fitted them to my car with no other change.
    Big changes hopefully to come this winter
    -Alex-

    07 A4 2.0 TFSI Quattro,Rebuilt engine, BPG pistons, S-Line interior, S-Line suspension, S4 brakes, RNS-E & Bose

  28. #28
    Veteran Member Four Rings Theiceman's Avatar
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    somewhat related ...

    I am replacing all my pistons in a couple of weeks .

    in my B8 actually . they seem cheap at about 110 US each OE .

    Is there a preferred vendor over stock ? I am looking at Carillos but the price jumps to about 170 per piston.
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