1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Piston Rings

Discussion in 'A3/S3 Forum (8L Chassis)' started by Lemon S3, Mar 27, 2012.

  1. Lemon S3
    Offline

    Lemon S3 Alex

    Joined:
    Sep 1, 2009
    Messages:
    1,319
    Likes Received:
    9
    [Mar 27, 2012]
    I've recently bought some forged rods so I've got the rods n pistons out, I've got some new big end bearings and was wondering if it would be sensible to change the rings as well? If so, where do I get them from as having trouble finding any a part from ones on ebay from lithuania.
    #1
  2. Ads

    Ads

    [Sep 30, 2014]

  3. s3dave
    Offline

    s3dave TFSI Hybrid

    Joined:
    Nov 11, 2009
    Messages:
    10,120
    Likes Received:
    729
    [Mar 27, 2012]
    TPS around £120 + vat ive just bought some....:icon_thumright: mine needed doing, all 4 was letting oil through
    #2
  4. StaceyS3
    Offline

    StaceyS3 Well-Known Member

    Joined:
    Dec 17, 2010
    Messages:
    2,138
    Likes Received:
    200
    [Mar 27, 2012]
    Iirc I got mine from audi for just over £120 Inc vat but that was with discount

    So are you finally rebuilding yours with a possible hybrid? ;)
    #3
  5. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 27, 2012]
    If you're thinking of changing the rings you will need to hone each bore and make sure the rings are gapped correctly. I'm goin to leave my piston rings alone unless they are in serious need of changing.
    #4
  6. S3featesV9
    Offline

    S3featesV9 Active Member

    Joined:
    Dec 8, 2010
    Messages:
    1,033
    Likes Received:
    12
    [Mar 28, 2012]
    Hmmm, Is that a must? Just because I'm not really too sure if my bores were honed when my rings where done? They wernt faulty, just had them replaced?
    #5
  7. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    I'm no engine expert but I was under the impression that the bores needed to be honed to ensure a good clean surface for the new rings.
    #6
  8. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,983
    Likes Received:
    1,365
    [Mar 28, 2012]
    You will need to hone the bores if fitting new rings else they won't be able to bed in properly and not seal... you would end up causing more issues than you started with... honing can be done with the engine in situe using a honing tool on a drill...

    Caution should be taken for obvious reasons and make sure you cover the crank journals while you do it and make sure everything is cleaned after with brake cleaner or similar..
    Laser Tools 2070 Engine Cylinder Hone

    Pay especially careful attention to the oil squirters...

    <tuffty/>
    #7
  9. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,614
    Likes Received:
    318
    [Mar 28, 2012]
    The rings are about 15-20quid per cylinder from Jason at All German Parts.

    As above you will need to hone the bores, but it can be done without removing the engine/crank.

    Personally i think its crazy to remove the pistons from an engine and NOT fit new rings. Sure they may well be fine, but so were the bearings, and you replaced those... Especially when the plan is to tune the engine, having as much of the motor fresh as possible will ensure a better end result.
    #8
  10. Sandip
    Offline

    Sandip Well-Known Member

    Joined:
    Nov 7, 2006
    Messages:
    2,382
    Likes Received:
    60
    [Mar 28, 2012]
    Westy, defo do the rings if the rods/pistons are out. Mine wasn't letting any oil through then this happened
    [​IMG]
    #9
  11. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Sandip, I still don't know what happened to your old 1.8T lump?!
    #10
  12. Sandip
    Offline

    Sandip Well-Known Member

    Joined:
    Nov 7, 2006
    Messages:
    2,382
    Likes Received:
    60
    [Mar 28, 2012]
    Piston ring shattered and took a chunk of the piston with it. I had major detonation, possibly dodgy fuel what was the cause. The head looked like someone had been at it with a chisel....really bad!

    I'm surprised i didn't bend a rod to be honest
    #11
  13. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Blimey. I'll be checking the rings on mine but I don't want to attempt the honing myself as I can do more harm then anything.
    #12
  14. Sandip
    Offline

    Sandip Well-Known Member

    Joined:
    Nov 7, 2006
    Messages:
    2,382
    Likes Received:
    60
    [Mar 28, 2012]
    Honing the bores and doing the rings would give you the peace of mind and take away any doubts in the future...... ;)
    #13
  15. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Unfortunately I don't have the time to get the block out to take to an engine specialist to get honed. Welly used his old rings and his car is going strong. I'll check them over when the pistons are out and I'll change them if they definitely need doing but it will probably end up delaying the build a bit.
    #14
  16. beachbuggy
    Offline

    beachbuggy Well-Known Member

    Joined:
    Jan 27, 2010
    Messages:
    1,760
    Likes Received:
    139
    [Mar 28, 2012]
    Rings per set from GSF are £11 so £44 in total. Definately hone bores.
    #15
  17. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,614
    Likes Received:
    318
    [Mar 28, 2012]
    how are you going to know if they "definitely need doing"?

    Didnt Tufftys break a ring after reusing them...
    #16
  18. Sandip
    Offline

    Sandip Well-Known Member

    Joined:
    Nov 7, 2006
    Messages:
    2,382
    Likes Received:
    60
    [Mar 28, 2012]
    Fair enough bud, you've got better luck than me so the chances of a major disaster like mine are slim! lol
    #17
  19. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,983
    Likes Received:
    1,365
    [Mar 28, 2012]
    You can hone with the block in place bud... if I were closer I'd do it for you :)

    <tuffty/>
    #18
  20. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    So do I mate.

    I have a couple of big worries like honing too much or at an angle where the block is in situ, or wrecking an oil squirter and needing to fix that!
    #19
  21. s3dave
    Offline

    s3dave TFSI Hybrid

    Joined:
    Nov 11, 2009
    Messages:
    10,120
    Likes Received:
    729
    [Mar 28, 2012]
    Went to see my car today at RStuning, and i saw a broken ring by the tool tray, and asked was that mine,? and he said yes, it snapped clean in half when the piston ring compressor released it... proberbly thousands of heat cycles then a sudden pressure release..150k milage though...:huh:
    #20
  22. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Ideally I could do with an ASN member who has done honing before and has all the kit to pop round mine Easter Weekend and lend a hand ;)
    #21
  23. S3featesV9
    Offline

    S3featesV9 Active Member

    Joined:
    Dec 8, 2010
    Messages:
    1,033
    Likes Received:
    12
    [Mar 28, 2012]
    I think I do too. Garage said they didn't get it honed!! Wtf?

    I've done about 1100 miles since then and no issues yet?
    #22
  24. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    If honing didn't need to be done and I could just slap new piston rings in I'd do that!
    #23
  25. S3featesV9
    Offline

    S3featesV9 Active Member

    Joined:
    Dec 8, 2010
    Messages:
    1,033
    Likes Received:
    12
    [Mar 28, 2012]
    garage said they didnt see any reason too as the bores were fine, and could still see the cross hatch on bores. so just did a quick deglaze with hot water and sos pad. apparently only need honing if you cant see the cross hatch?. if it needed it then it would of been sent away with the crank.
    #24
  26. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,983
    Likes Received:
    1,365
    [Mar 28, 2012]
    Depends on the definition of 'honing' I guess... I use the hone tool I linked to above and deglaze/add cross hatch to the bores... while this isn't honing in teh traditional sense it will serve to do the same thing at the end of the day... just because you can see the cross hatch doesn't mean it will be much use in bedding in new rings tbh... a quick run up and down the bore with a honing tool such as the Laser one is usually more than enough...

    <tuffty/>
    #25
  27. S3featesV9
    Offline

    S3featesV9 Active Member

    Joined:
    Dec 8, 2010
    Messages:
    1,033
    Likes Received:
    12
    [Mar 28, 2012]
    your right in saying that, if your going to do a job...then use the right tools. just thinking that maybe westy could use same method as the garage i used if he doesnt have access or feel comfortable using the drill bit. although theres only one way to learn, its not too expensive either.

    take twice as long though and more elbow grease using a steel wool pad too.

    garage have told me not to worry, so thats some weight off the shoulders.
    #26
  28. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,614
    Likes Received:
    318
    [Mar 28, 2012]
    the yanks seem to like the flexhone tools, i've got a 1.8T sized one you can borrow if you want.
    #27
  29. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Ok guys, you've finally done it! You've persuaded me to do the sodding rings :)

    Aragorn if you dont mind me borrowing your honing brush I'll pay the postage and hook you up for a few beers too.

    Can anyone confirm what rpm drill I will need to use this tool?
    #28
  30. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Also is the bore 81mm when buying rings?
    #29
  31. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,614
    Likes Received:
    318
    [Mar 28, 2012]
    I just used my variable speed mains drill and just sort of guessed the speed after watching a few youtube videos :p

    Standard bore is 81mm yes.
    #30
  32. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Cheers. Just ordered the rings.

    If I PM you my address are you ok to post me the brush and invoice me for postage? :)
    #31
  33. monkey_lewis
    Offline

    monkey_lewis Reverse Gear

    Joined:
    Jan 10, 2011
    Messages:
    199
    Likes Received:
    2
    [Mar 28, 2012]
    Dont want it high tho
    #32
  34. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,614
    Likes Received:
    318
    [Mar 28, 2012]
    yeh, iirc the video did two speeds, so many strokes slowly and so many strokes at a higher speed.

    Westy: yeh i can send you the tool
    #33
  35. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,983
    Likes Received:
    1,365
    [Mar 28, 2012]
    I used the 1st speed on a battery drill for mine... just felt more in control if I did manage to catch the squirter...

    <tuffty/>
    #34
  36. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

    Joined:
    Apr 26, 2004
    Messages:
    12,606
    Likes Received:
    278
    [Mar 28, 2012]
    Where from bud? Care to share cost too

    #35
  37. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    #36
  38. beachbuggy
    Offline

    beachbuggy Well-Known Member

    Joined:
    Jan 27, 2010
    Messages:
    1,760
    Likes Received:
    139
    [Mar 28, 2012]
    #37
  39. Prawn
    Offline

    Prawn My other car is a MINI!!!!

    Joined:
    Dec 8, 2006
    Messages:
    9,637
    Likes Received:
    1,382
    [Mar 28, 2012]
    Westy, are they genuine in any way? Would you perhaps not be best off going for some direct from TPS? or through jason? or am I missing something on the ad?
    #38
  40. Westy
    Online

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,307
    Likes Received:
    973
    [Mar 28, 2012]
    Nobody said they were half that price, they said £15-£20 per bore which is still £60-£80. Plus it's easier for me to click a few buttons then to phone GSF and ask for "Jason" and ask for a discount etc.
    #39
  41. beachbuggy
    Offline

    beachbuggy Well-Known Member

    Joined:
    Jan 27, 2010
    Messages:
    1,760
    Likes Received:
    139
    [Mar 28, 2012]
    I said here! I'd even have given you the part number.
    #40

Share This Page