f1zzm Posted November 5, 2013 Share Posted November 5, 2013 Hi allcould anyone tell me how to tell if my 1200 engine is 8 or 8.5/1 by looking at engine numbers,thanks. Quote Link to comment Share on other sites More sharing options...
JohnD Posted November 5, 2013 Share Posted November 5, 2013 You can't do more than guess what the compression might have been At this length of time, unless you can document that no work has been done, the head will have been skimmed and/or the chambers enlarged, by flowing them. Only measuring the chamber size can define the CR.John Quote Link to comment Share on other sites More sharing options...
f1zzm Posted November 6, 2013 Author Share Posted November 6, 2013 Hi John The head doesnt seem to have been machined in any way, and it is from a verylow milage car (although could have gone round the clock) i was hopeing i could just look at numbers but i guess i will have to mesure volumes and get my rusty head around the maths, is there a known thickness for an un molested head? Thanks for the input though. Quote Link to comment Share on other sites More sharing options...
Casper Posted November 6, 2013 Share Posted November 6, 2013 The early engines were 8:1The major change point was at GA178101E (Nov 1964) on, (the 'hot cam' engine) when it went to 8.5:1But, as John says, after 50 years, who knows ?C. Quote Link to comment Share on other sites More sharing options...
f1zzm Posted November 7, 2013 Author Share Posted November 7, 2013 Thanks CasperThats just the info i was after, a great help.D Quote Link to comment Share on other sites More sharing options...
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