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Post by steven on Mar 27, 2013 20:14:58 GMT 1
Hi,
I have an old 4L0 cylinder head, it has quite bad detonation marks on one combustion chamber.
Does anyone repair these heads? or are they just scrap now?
I am assuming they must have to be welded up and re machined?
If you have a damaged 4L1 head, with the similar detonation marks, could it be re profiled to a 4L0 head?
steven.
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Post by muttsnuts on Mar 27, 2013 20:21:24 GMT 1
yes so long as the damage is not too deep, skim the head and recut the chamber, I have a nifty little tool that I made that recuts the apron of the chamber (slanting bit), then its just a case of skimming it to the required level, not forgetting to check that the head bolts still clamp the head correctly, if not, use thicker washers
HTH
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Post by steven on Mar 28, 2013 0:58:11 GMT 1
ok, thanks for the info.
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higgsy
Thrash Merchant
Posts: 458
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Post by higgsy on Mar 28, 2013 8:46:40 GMT 1
Speak to Bob Farnham, he's repaired some horrendous damage to some of my heads!
Basically as headcoates said, it's a skim to get it straight then the combustion chambers cut back and cc'd to get the bowl volume correct. Of course this gives you the option to improve the squish and combustion chamber shape while you're at it :-)
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Post by skaterboy on Mar 28, 2013 12:48:44 GMT 1
I have a head that needs to be re-skimmed and wanted to get the combustion chambers recut and optinum squish value . What is the best value and best place to get it done  ? |
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Post by ianr4863 on Mar 28, 2013 18:54:46 GMT 1
You could speak to Fahron . He takes his time but does a top job for a fair price .
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Post by johnlc on Mar 28, 2013 19:51:53 GMT 1
I got a 250lc head done for my 350lc by fahron recently he reprofiled it to suit my engine he advised me to get the smaller head as he ciuld make a better job than the standard head as their is a lor more metal to work with machinibg wise
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