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| Home > General Chat > well these pics says it all, ring land failure | |||||||
 6965 Posts Member #: 507 Fastest A Series Mini in the World leeds/wakefield. |
5th Sep, 2007 at 04:20:45pm
i too have mega pistons in both cars 3 engines., never broke any, melted a few though.lol |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
5th Sep, 2007 at 05:22:43pm
On 5th of Sep, 2007 at 08:13am robert said:
could the part of the piston that has broken be under the squish area where its deepest ? if so ,could the excess fuel be sufficient to hydraulic in the area between the top ring and the head face ,and so break the land ? incedentaly , detonation tends to melt things or make them sieze ,which does not look like its happening ,whereas pre ignition tends to shatter things ,specially cast and hyperutectic pistons ... dave ,where yours the cast ones ? Over fueling to the point of hydraulicing is simply impossible! You would need loads of neat liquid fuel in there!! Pre-ignition is where the burn is started before the spark is delivered. Detonation is where multiple flame fronts colide in the combustion chamber, which can happen do to pre ignition. Either way there would be marks on the top of the pistons that identy det has occured and where.... Alex AlexF |
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
5th Sep, 2007 at 05:39:38pm
http://www.streetrodstuff.com/Articles/Eng...tion/Page_2.php On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
5th Sep, 2007 at 05:48:08pm
you do not have to have a spark to get det - that article is incorrect...
AlexF |
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
5th Sep, 2007 at 05:53:59pm
Now hold it right there Mr Flower.....
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
5th Sep, 2007 at 06:21:18pm
Anti Ignition?? Without spark whatsoever? isnt that a diesl?
Edited by Sprocket on 5th Sep, 2007. On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
5th Sep, 2007 at 06:34:52pm
Like I said - lets see the reference around the picture... On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
5th Sep, 2007 at 06:35:06pm
http://www.stahl.de/fileadmin/Dateien/ex-z...n_processes.pdf
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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 1849 Posts Member #: 672 The oversills police Oslo, Norway |
5th Sep, 2007 at 09:45:34pm
there are loads of pictures like that in heywoods book on internal combustion engines. |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
6th Sep, 2007 at 10:32:27pm
unfortunatly I do not know the source of that picture - its one from BMW and not a great one at that as it labels the pics BDC - clearly not Bottom Dead Centre.
AlexF |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
7th Sep, 2007 at 12:41:18am
Quote Detonation
Detonation is the spontaneous combustion of the end-gas (remaining fuel/air mixture) in the chamber. It always occurs after normal combustion is initiated by the spark plug. The initial combustion at the spark plug is followed by a normal combustion burn. For some reason, likely heat and pressure, the end gas in the chamber spontaneously combusts. The key point here is that detonation occurs after you have initiated the normal combustion with the spark plug. Quote On 6th of Sep, 2007 at 10:32pm AlexF2003 said:
Anti-ignition is simple igntion occuring after the point the spark has been delivered but not because of the spark. Its the same as pre-ignition just at a point after the spark should have done its job. Quote Pre-ignition
Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing. Anytime something causes the mixture in the chamber to ignite prior to the spark plug event it is classified as pre-ignition. Quote The two are completely different and abnormal phenomenon.
Still confused as to how you achieve Det without a spark 
Quote On 5th of Sep, 2007 at 05:48pm AlexF2003 said:
you do not have to have a spark to get det - that article is incorrect... Google finds little on Anti - ignition relating to internal combustion engines, though i did find it mentioned in this page 
Please, this is a friendly discussion 
Edited by Sprocket on 7th Sep, 2007. On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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 1913 Posts Member #: 1392 Pointless Post Whore Liverpool, North west |
7th Sep, 2007 at 05:47:50pm
you just like stirring up sprocket Back once again like a renegade master |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
7th Sep, 2007 at 07:01:55pm
LOL!
AlexF |
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1913 Posts Member #: 1392 Pointless Post Whore Liverpool, North west |
7th Sep, 2007 at 08:36:13pm
Im on the same level as regards to your detonation now as i can see this on the pics you posted.
Back once again like a renegade master |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
7th Sep, 2007 at 09:49:47pm
glowing bits of the combustion chamber...
AlexF |
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 8297 Posts Member #: 408 Turbo Love Palace Fool Aylesbury |
7th Sep, 2007 at 10:31:15pm
On 7th of Sep, 2007 at 08:36pm minimadj said:
Im on the same level as regards to your detonation now as i can see this on the pics you posted. Still cant see how combustion can occur with no spark though? How do you think diesels work? They don't have a spark, they combust by compression and heat. https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel
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 6274 Posts Member #: 509 Post Whore Isle of Man |
7th Sep, 2007 at 10:40:28pm
Im no where near as bright as you lot on this subject, but i cant see any contradiction in AlexF's quotes, and htey all seem valid to me??
"Turbo's make torque, and torque makes fun"
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 1060 Posts Member #: 588 Post Whore Delaware, USA |
7th Sep, 2007 at 10:41:24pm
On 7th of Sep, 2007 at 08:36pm minimadj said:
Still cant see how combustion can occur with no spark though? Just listen to an engine running on after you turn the ignition key off!! Back to the pistons, All I can say is that mine were fine until it was overfuelled (AFR was at least 11) and the ignition was advanced to 30 degrees...... THEN they went!!. One showed some very light detonation marks but the other did not and all were sooty above the top ring. Terry website:- http://www.terryhunt.co.uk
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1913 Posts Member #: 1392 Pointless Post Whore Liverpool, North west |
7th Sep, 2007 at 10:41:44pm
Okay then, I knew it was diesel system
Back once again like a renegade master |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
7th Sep, 2007 at 10:53:12pm
2000 odd degrees will go it AlexF |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
7th Sep, 2007 at 11:09:02pm
On 7th of Sep, 2007 at 09:49pm AlexF2003 said:
glowing bits of the combustion chamber... Could be plug (typically wrong temp plug), or carbon build up or even how the combustion chamber is shaped eg Austin o_series engine had a square machine around the plug hole with sharp edges. Valve bridges (the area between two valves) gets very hot as there is no cooling passages. Just like in the picture above.... Alex If there are red hot parts in the chamber, then it would ignite befor the spark, so Pre Ignition On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
8th Sep, 2007 at 10:07:08am
your right it could...
AlexF |
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1913 Posts Member #: 1392 Pointless Post Whore Liverpool, North west |
8th Sep, 2007 at 02:17:29pm
Dont worry alex I belive ya. Ive just never delved into this subject. Back once again like a renegade master |
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538 Posts Member #: 119 Post Whore Staffordshire or Northamptonshire |
9th Sep, 2007 at 12:18:02am
Are these Mega pistons ?
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
9th Sep, 2007 at 01:12:57am
My apologies On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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