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Yeah, I've ssen that sort of damage as well... But on a turbod engine.
I've heard of water leaking gaskets wrecking the bores before, but thoughtthat was a very rare thing to happen. bad luck, I guess... Another forum suggested, detonation could be a cause - I think that could be possible, as I indeed had - occasinally - problems with that. Iin low rev-high load situations. The engine made a 'pinging' noise. Is this also refered to as det?
Serves me right for not sorting that out in time, I guess...
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I think the fact the plugs are corroded on the thread is a pretty big clue where the water has been coming from... Though why it'd affect those two more than the others I don't know, water isn't all that picky IME lol.
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bl1300
Posted a lot
Posts: 1,678
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Pinging, Pinking, Knocking and Detonation are all different terms for the same thing. I,e pre ignition the mixture igniting when the piston is still on its up stroke.
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Current fleet.
1967 DAF 44
1974 VW Beetle 1303s
1975 Triumph Spitfire MkIV
1988 VW LT45 Beavertail
1998 Volvo V70 2.5
1959 Fordson Dexta
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scruff
Part of things
Posts: 621
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Jul 10, 2011 10:23:47 GMT
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Pinking is not detonation.
Pinking is pre-ignition
Detonation is explosive combustion
Pinking is not that serious, it needs addressing but won't cause any problems if it's only occasional. A de-coke (Carb cleaner in the intake) can fix it.
Detonation will kill the engine in no time at all and smash things.
The reason for this is pinking is just like the ignition timing being miles out, the fuel still burns on a flame front
Detonation causes a massive spike in the peak combustion pressure as the whole lot goes up explosively in one go.
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Last Edit: Jul 10, 2011 10:25:17 GMT by scruff
1994 Lotus Esprit - Fragile red turbo with pop up lights.
1980 Porsche 924 - Fragile red turbo with pop up lights.
I spy a trend...
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Jul 10, 2011 10:33:39 GMT
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Its like mythbusterss in here, with BL1300 supplying an endless stream of myths
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1974 Lancia Beta Saloon
1975 Mazda 929 Coupé
1986 Mazda 929 Wagon
1979 Mazda 929 Hardtop
1982 Fiat Argenta 2.0 iniezione elettronica
1977 Toyota Carina TA14
1989 Subaru 1800 Wagon
1982 Hyundai Pony 1200TL 2-dr
1985 Hyundai Pony 1200 GL
1986 Maserati 425 Biturbo
1992 Rover 214 SEi 5-dr
2000 Rover 45 V6 Club
1994 Peugeot 205 'Junior' Diesel
1988 Volvo 760 Turbodiesel Saloon
1992 Talbot Express Autosleeper Rambler
2003 Renault Laguna SPEARS OR REAPERS
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Pinking is not detonation. Pinking is pre-ignition Detonation is explosive combustion Pinking is not that serious, it needs addressing but won't cause any problems if it's only occasional. A de-coke (Carb cleaner in the intake) can fix it. Detonation will kill the engine in no time at all and smash things. The reason for this is pinking is just like the ignition timing being miles out, the fuel still burns on a flame front Detonation causes a massive spike in the peak combustion pressure as the whole lot goes up explosively in one go. From what I understand, pinking is where the fuel isn't as stable as it needs to be for the conditions inside the cylinder, and ignites from a hotspot before the spark ignites it, causing an early flame front. De-coking the engine reduces the particulates and carbon the glow and cause the fuel to pre-ignite. Detonation is where the heat and pressure cause the fuel to ignite spontaneously from within the mixture, at several points at once, and the fronts collide? Either way both conditions aren't desirable... --Phil |
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scruff
Part of things
Posts: 621
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Agreed neither are good but pinking/pinging isn't very damaging
The odd bit of pinking under heavy load, hot engine, poor fuel, coked up engine, etc is to be expexcted on old engines worked hard. It sounds like somoene tapping a coin on a tin roof, tink-tink. My Nova used to do it when driven hard.
Detonation sounds like a bottom end knocking, loud, intermittant and very unpleasant. Won't go on for long though as it'll all suddently go quiet...
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1994 Lotus Esprit - Fragile red turbo with pop up lights.
1980 Porsche 924 - Fragile red turbo with pop up lights.
I spy a trend...
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Jul 13, 2011 13:39:43 GMT
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Ok, thanks for clearing that up  In that case I had only pinging, not detonation. As far as I can trust my ears of course. Cheers, Jan |
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In that case I had only pinging, not detonation. As far as I can trust my ears of course.