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displaying posts 26 to 42 of 42
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| Author | Subject: Melted piston |
 phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #26
That's upmarket car repair technique in Donny that....________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
 Posted 19th Sep 2009 at 04:57
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birk
Seasoned Pro  Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #27
 ________________________________________ Dimma + Gt35 turbo = Solid rear beam mounts £130 07889376885 Dan |
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Posted 19th Sep 2009 at 06:09
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aaron6
Seasoned Pro  Location: On the sofa in maidstone Registered: 16 May 2006 Posts: 5,840 Status: Offline |
Post #28
rich_w wrote: Is that all?! Im a toolmaker by trade and a roughness average or 50 is awfull. With the right cutter, speeds and feeds you can easily achieve a 1.6 ra or better. Grinding will of coarse be better but why bother when milling would be so easy. Wouldnt you just scrape the block flat to save stripping it down? Thats all i did on my birds TU engine when rebuilding after a cambelt failure and that works a treat. Just takes a little time. < 50 RA is the general guideline in terms of MLS gaskets - this doesn't have to be ground, it can be done on a good flycutter. I would also check the block for a crack - however it will be very small, and not necessarily visible!  ________________________________________ See the sheer power and might of the lesser known burrowing owl. |
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Posted 20th Sep 2009 at 04:47
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chrisd306
Seasoned Pro  Location: Perth Scotland Registered: 26 Nov 2005 Posts: 10,061 Status: Offline |
Post #29
Wait til you see the pic of my piston tomorrow i think it should be bad.________________________________________ In my garage just now2003 BMW M3 & 2009 L200 Raging Bull & Audi Q5 S Line AX stock rod & Saxo Stock rod Sold the bike an charged rallye an bought a caravan, midlife crisis or what! |
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Posted 21st Sep 2009 at 00:06
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #30
birk wrote: There is no carbon on the top of that piston, I read somewhere thart that is a good sign of a water leak into that cylinder. Having suffered with overheating issues in the past this is looking very much like you have a crack in the bore somewhere. Can you get the block out, strip it and then have it pressure thested? ________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 22nd Sep 2009 at 00:12
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birk
Seasoned Pro Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #31
The block is already out of the car dave Ive replaced the engine as i couldnt be arsed figuring out what was up with the block Not sure what to do with it now, probs just strip it down at some point and get it tested, then maybe sell it. ________________________________________ Dimma + Gt35 turbo =Solid rear beam mounts £130 07889376885 Dan |
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Posted 22nd Sep 2009 at 00:25
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chrisd306
Seasoned Pro Location: Perth Scotland Registered: 26 Nov 2005 Posts: 10,061 Status: Offline |
Post #32
wait till you see my thread mate, all 4 pistons are f*cked!! its bad pitting due to running normal unleaded instead of super, epic fail!!________________________________________ In my garage just now2003 BMW M3 & 2009 L200 Raging Bull & Audi Q5 S Line AX stock rod & Saxo Stock rod Sold the bike an charged rallye an bought a caravan, midlife crisis or what! |
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Posted 22nd Sep 2009 at 00:42
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buzzbrightyear
Seasoned Pro  Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #33
so high octane fuel is a must on these s/c 6`s then is it??????????andy ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 22nd Sep 2009 at 01:18
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #34
I would have thought that would be a given!________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 22nd Sep 2009 at 01:20
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buzzbrightyear
Seasoned Pro Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #35
?________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 22nd Sep 2009 at 02:21
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chrisd306
Seasoned Pro Location: Perth Scotland Registered: 26 Nov 2005 Posts: 10,061 Status: Offline |
Post #36
yes it is, i totally forgot to be honest, as i never new for sure!       no damage to valves  ________________________________________ In my garage just now2003 BMW M3 & 2009 L200 Raging Bull & Audi Q5 S Line AX stock rod & Saxo Stock rod Sold the bike an charged rallye an bought a caravan, midlife crisis or what! |
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Posted 22nd Sep 2009 at 03:21
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birk
Seasoned Pro Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #37
Nasty  ________________________________________ Dimma + Gt35 turbo =Solid rear beam mounts £130 07889376885 Dan |
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Posted 22nd Sep 2009 at 03:32
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chrisd306
Seasoned Pro Location: Perth Scotland Registered: 26 Nov 2005 Posts: 10,061 Status: Offline |
Post #38
oops on my part like!! stil able to build an engine as got set of pistons that are ok and a spare head and bottem end aswell, so will end up with 3 engines complete, still a bas**rd, that was still runnin before i took it out, just didnt idle, but when reved still went ok lol________________________________________ In my garage just now2003 BMW M3 & 2009 L200 Raging Bull & Audi Q5 S Line AX stock rod & Saxo Stock rod Sold the bike an charged rallye an bought a caravan, midlife crisis or what! |
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Posted 22nd Sep 2009 at 03:42
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rich_w
Seasoned Pro  Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #39
It turns out Chris' pistons melted becuase he was using regular unleaded - 95 octane.This isn't nearly as stable, and doesn't burn as controlably as super unleaded like V-Power or Tesco 99 octane. The result is detonation, and melted pistons as can be seen by the pics. So, all low-boost S/C users, please fill up with a high octane fuel like V-Power or Tesco 99 octane, as recommended in the installation guide. The problem is high compression engines like the XU10J4RS, particularly when boosted, will be prone to det if poor quality fuel is used, or they run lean, too hot etc. If you want to use regular unleaded [95 octane] I can supply some modified ECU software with less ignition advance [and slightly less power!]. Cheers Rich ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 22nd Sep 2009 at 05:21
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #40
You can see where the flame front has got to before the rest has simply detonated under the pressure  ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 22nd Sep 2009 at 05:34
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chrisd306
Seasoned Pro Location: Perth Scotland Registered: 26 Nov 2005 Posts: 10,061 Status: Offline |
Post #41
Post #214 Rich, i totaly acept the blame for this, as both counts was my fault, shit oil then wrong fuel, the kit is an excellant kit and i was very happy with it, so i recomend it to anyone, as long as they use good oil and the correct fuel. ________________________________________ In my garage just now2003 BMW M3 & 2009 L200 Raging Bull & Audi Q5 S Line AX stock rod & Saxo Stock rod Sold the bike an charged rallye an bought a caravan, midlife crisis or what! |
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Posted 22nd Sep 2009 at 13:30
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rich_w
Seasoned Pro Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #42
Chris, not trying to blame anyone mate! These things happen, I mean look at how many engines I have killed getting to where I am now. I raised the point purely because I dont want other people to have the same issues :-) ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 22nd Sep 2009 at 15:05
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