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nwsteve
2CV Fan
Joined: January 2nd, 2012, 6:59 pm
Posts: 41
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 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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| June 21st, 2016, 12:44 am |
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ChrisW
Firing on two.
Joined: February 21st, 2012, 9:01 pm
Posts: 1136
Location: Avranches, Sud Manche, France
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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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| June 21st, 2016, 9:08 pm |
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richardmorris
Firing on two.
Joined: July 9th, 2009, 10:27 am
Posts: 493
Location: Bagshot Park
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Re: Cylinder head erosion Is that caused by pinking?
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| July 8th, 2016, 10:30 pm |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
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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
_________________
Kissing the Lash
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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| July 9th, 2016, 9:38 pm |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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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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| July 9th, 2016, 10:57 pm |
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nwsteve
2CV Fan
Joined: January 2nd, 2012, 6:59 pm
Posts: 41
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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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| July 12th, 2016, 9:04 pm |
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ChrisW
Firing on two.
Joined: February 21st, 2012, 9:01 pm
Posts: 1136
Location: Avranches, Sud Manche, France
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Re: Cylinder head erosion Heads are fine - with studs, valves and no erosion
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| July 13th, 2016, 9:24 am |
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