Post #1
Well... That was the cause of my problem last week
What exactly would cause this ?
________________________________________
Dimma + Gt35 turbo =
Solid rear beam mounts £130
07889376885
Dan
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displaying posts 1 to 25 of 42
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| Author | Subject: Melted piston |
 birk
Seasoned Pro  Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
That was the cause of my problem last week What exactly would cause this ? Solid rear beam mounts £130 07889376885 Dan |
 Posted 18th Sep 2009 at 02:30
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #2
Lean running/running too hot/air leak.________________________________________ - 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 18th Sep 2009 at 02:31
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birk
Seasoned Pro Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #3
Hmmm, thats a number of things.It wasnt hot i dont think, engine was running fine before it went bang! Running lean, sticky injector maybe ? Air leak, from where ? surely more air would help, or you mean into the cylinder from somewhere ________________________________________ Dimma + Gt35 turbo =Solid rear beam mounts £130 07889376885 Dan |
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Posted 18th Sep 2009 at 02:38
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #4
Air leak into the cylinder.________________________________________ - 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 18th Sep 2009 at 02:40
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birk
Seasoned Pro Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #5
Ahh well, its done now!  Will get a pic 2moz  ________________________________________ Dimma + Gt35 turbo =Solid rear beam mounts £130 07889376885 Dan |
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Posted 18th Sep 2009 at 02:43
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Rich E
Forum Admin Location: Hertfordshire Registered: 27 Apr 2005 Posts: 7,757 Status: Offline |
Post #6
Did you test compression before you ran it after the HG replacement?I'd get the head pressure tested to make sure the valves are sealing ok and then look at the injectors. ________________________________________ Rich |
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Posted 18th Sep 2009 at 02:44
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birk
Seasoned Pro Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #7
Nope, didnt think i had to, it started as it used to, so thought it would be ok.The head will be getting sold on now, as i have no need for it, what with having a new engine now I'll get the injectors looked at aswell, dont want another melted piston ________________________________________ Dimma + Gt35 turbo =Solid rear beam mounts £130 07889376885 Dan |
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Posted 18th Sep 2009 at 02:48
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #8
There's an ANSU cleaning place on that daft roundabout on the Parkway.________________________________________ - 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 18th Sep 2009 at 02:50
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birk
Seasoned Pro Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #9
Wicked, wheres that then ? you got a name or number ?________________________________________ Dimma + Gt35 turbo =Solid rear beam mounts £130 07889376885 Dan |
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Posted 18th Sep 2009 at 02:52
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #10
Nah, they're next to a hose/seals place we use, never used them though.________________________________________ - 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 18th Sep 2009 at 02:59
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pete_rallye
Seasoned Pro  Location: Yorkshire Registered: 12 Dec 2002 Posts: 5,253 Status: Offline |
Post #11
More air=leaner mixture=hotter temp. Remember bunsen burners at school, more air, hotter flame... Sure its melted and not detonated?Have many sc people had melted pistons? Crossflow aka Rob on here has an ASNU machine, sure if you ask him nicely he'll do them for not too much dosh... ________________________________________ Oulton Park in a BTCC 306 vid 1Oulton Park in a BTCC 306 vid 2 Lap of the 'ring |
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Posted 18th Sep 2009 at 03:37
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rich_w
Seasoned Pro  Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #12
Dan,Pretty much as others have said: - Breached HG - this causes the surrounding water-jacket to fill with air, the cylinder loses it's cooling, hot spots develop and cause det - Cracked block - as above - Lean running due to blocked injector or fuel starvation - causes det. - If this is the engine that had the HG repaired, skimming heads often leaves sharp edges around the combustion chamber in the head - these form hot spots and also cause det. - The software used on the S/C conversion is quite conservative and rich, to aid piston cooling and help prevent det. So fueling is unlikely to be the issue. - A blocked oil spray bar would cause the piston to over-heat. - When the HG went before, if it severely over-heated the bore could be out of round causing improper ring sealing. This means you get oil contamination on the bores, which also induces det. What cylinder was it on? ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 18th Sep 2009 at 04:12
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birk
Seasoned Pro Location: Doncaster Registered: 24 Oct 2005 Posts: 7,032 Status: Offline |
Post #13
It was on the one where the headgasket blew, so related to that it seems.Melted = the piston has curled over and sunk down on the edge, like a candle if you like. ________________________________________ Dimma + Gt35 turbo =Solid rear beam mounts £130 07889376885 Dan |
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Posted 18th Sep 2009 at 04:56
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chrisd306
Seasoned Pro  Location: Perth Scotland Registered: 26 Nov 2005 Posts: 10,061 Status: Offline |
Post #14
get some pics up mate________________________________________ 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 19th Sep 2009 at 00:36
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crossflow
Regular  Location: England Registered: 21 Jan 2008 Posts: 159 Status: Offline |
Post #15
with the piston melting in the same cylinder as where the headgasket blew, points to one thing which is when headgasket blow just skimming the head is not enough you need to deck the block also due to it been warped aswell.It's very common for people these days not to skim the block aswell due to the work involved. These new age steel headgaskets need a perfect finish for them to seal right. You need head and blocks to be ground to get the steel headgasket to seal correctly. |
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Posted 19th Sep 2009 at 03:07
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #16
^^What he said, really you need a minimum of 50 microinch finish on both the block and the head, I took mine to 12.5 when I did mine.________________________________________ - 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 19th Sep 2009 at 03:21
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crossflow
Regular Location: England Registered: 21 Jan 2008 Posts: 159 Status: Offline |
Post #17
Only a few places will have grinders to do this i know i'am the only one around my area that has a surface grinder |
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Posted 19th Sep 2009 at 03:35
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #18
Did mine on the mill.________________________________________ - 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 19th Sep 2009 at 03:36
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crossflow
Regular Location: England Registered: 21 Jan 2008 Posts: 159 Status: Offline |
Post #19
We need to use grinder as we rebuild F1 engines which don't use headgaskets at all |
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Posted 19th Sep 2009 at 04:34
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #20
Not really any advantage either way for an MLS gasket though.________________________________________ - 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 19th Sep 2009 at 04:37
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rich_w
Seasoned Pro Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #21
< 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! ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 19th Sep 2009 at 04:41
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #22
^Magnaflux do a decent dye inspection kit for picking up cracks - although obviously only if they've reached the surface.I think I've still got some of the dye somewhere if you want to borrow it Dan? Have to see if I can find the UV lamp though  ________________________________________ - 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 19th Sep 2009 at 04:44
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rich_w
Seasoned Pro Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #23
Aye, Magnaflux is good, unless you have an x-ray machine, which is even better  ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 19th Sep 2009 at 04:49
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #24
Don't tell him that, he'll be off up to Sheffield General with it tucked under his shirt, pretending he got broken ribs...________________________________________ - 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 19th Sep 2009 at 04:49
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rich_w
Seasoned Pro Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #25
phillipm wrote: Don't tell him that, he'll be off up to Sheffield General with it tucked under his shirt, pretending he got broken ribs...  Have people from Donny got a reputation like that then? ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 19th Sep 2009 at 04:53
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