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| Cylinder head erosion http://www.international2cvfriends.com/forum/viewtopic.php?f=7&t=5821 |
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| Author: | nwsteve [ June 21st, 2016, 12:44 am ] |
| Post subject: | Cylinder head erosion |
Greetings Took the heads off one of my Visa engines- this is the 'good' engine. Once I had cleared off the black crap, I found it had lots of pits by the exhaust valve seat and on the edge of the combustion chamber- just starting to eat into the flat bit where the barrel sits. The exhaust valve seat is pitted too. Piccy:  Is the head scrap or still useable? |
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| Author: | ChrisW [ June 21st, 2016, 9:08 pm ] |
| Post subject: | Re: Cylinder head erosion |
I have a pair on an engine I used before if you need - also rebuilt cam by Kent cams etc etc |
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| Author: | richardmorris [ July 8th, 2016, 10:30 pm ] |
| Post subject: | Re: Cylinder head erosion |
Is that caused by pinking? |
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| Author: | Sean [ July 9th, 2016, 9:38 pm ] |
| Post subject: | Re: Cylinder head erosion |
certainly looks like there was some. Its always at the edge opposite the sparkplug where the hump of the piston is closest to the head |
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| Author: | ken [ July 9th, 2016, 10:57 pm ] |
| Post subject: | Re: Cylinder head erosion |
That would have taken some doing on a Visa 652, considering that the ignition timing was set by Citroen. Mind you, many years back I heard about some characters who locked in the extra 10* vacuum advance, reckoning that made the engine more 'lively', just as long as you ignored the resultant pinking, of course. Now I think about it, they were based somewhere in the north-east...  Sean wrote: certainly looks like there was some. Its always at the edge opposite the sparkplug where the hump of the piston is closest to the head |
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| Author: | nwsteve [ July 12th, 2016, 9:04 pm ] |
| Post subject: | Re: Cylinder head erosion |
ChrisW wrote: I have a pair on an engine I used before if you need - also rebuilt cam by Kent cams etc etc I've got to look at all options- any chance of some pics of the heads you have got? |
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| Author: | ChrisW [ July 13th, 2016, 9:24 am ] |
| Post subject: | Re: Cylinder head erosion |
Heads are fine - with studs, valves and no erosion |
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