MarkDeTriomphe Posted January 20, 2009 Share Posted January 20, 2009 Hi All - couldn't find another thread to hi-jack, so had to resort to starting a new one. I have two cylinder heads in the shed (one of which may be destined for Alex's MKI) - neither of which seems to have totally consistent markings / measurements. Anyone like to suggest where they might have come from?The first has a casting (raised) number 312388 and stamped 218255. It is approximately 3.4" high but has 30.3mm exhaust valves. Was fitted to Alex's MKII when he bought it, so seems reasonable enough. However, unless I am measuring the valves incorrectly, shouldn't this head have 32mm valves? Could they be unleaded?The second head is more of a puzzle. The casting (raised) number is 313247 and it is stamped 219016. The head height is 3.5+" and it has 30.3mm valves - and I am sure these are not unleaded. The casting number and height indicate a low compression carburated TR6 head from Africa ( :-/). The stamp# and exhaust valves seem to indicate an "S" head. Since I have only ever taken apart two 6 cylinder engines - one "S" engine and one 2500 (pre TC), I'd have assumed it was from the "S" - but has anyone ever seen a low compression "S"?Thanks for any ideas,Mark Link to comment Share on other sites More sharing options...
Greeks Posted January 21, 2009 Share Posted January 21, 2009 I'm guessing that you've had a butcher's at this Mark: http://www.triumphclub.co.nz/technical.htmlPerhaps remeasure and check again...or it might be like my crankshaft - the numbers don't agree with the records? :-/They must have had fun in the factory putting these little riddles for [s]idiots[/s] enthusiasts like us to try and figure out 40 years later :-) Link to comment Share on other sites More sharing options...
DJB_Harvey Posted January 21, 2009 Share Posted January 21, 2009 Cylinder head part no 218225? (dont think theres a head no 218255) is 3.400"...Valve size debatable on year and application.....No2 head 219016 is a 2500 S head 3.475" and has 30.3 mm exhaust valves....Dont think there ever was a low compression head for a S....HOWEVER im at work at the mo so all these figures /part nos are from memory ! Also there never was an un-leaded head from the factory but quality original 30.3mm valves 149872/3 (I think !) were stellite faced /tipped. Link to comment Share on other sites More sharing options...
MarkDeTriomphe Posted January 22, 2009 Author Share Posted January 22, 2009 Thanks for the reply. 218225 is the number stamped on head number 1 and seems to tie in with the data on the link posted by Greeks above - all except for the valve size.Head 2 is still a puzzle. I am willing to accept that I may have measured the height incorrectly - it was dark when I was sorting them out last night. However, the numbers still don't seem to tie in with the table in the above post - ie head stamp = 219016 and casting # = 313247 - see picture. Think I'll have to do some more measuring at the weekend! Link to comment Share on other sites More sharing options...
Deleted User Posted January 26, 2009 Share Posted January 26, 2009 Tagged for home interest Link to comment Share on other sites More sharing options...
Royboy66 Posted January 26, 2009 Share Posted January 26, 2009 my head is a 219016 with the number 313248 ! Link to comment Share on other sites More sharing options...
Richard B Posted January 26, 2009 Share Posted January 26, 2009 Bet they used whatever casting was in stock... Link to comment Share on other sites More sharing options...
Nick Jackson (2) Posted January 26, 2009 Share Posted January 26, 2009 Does it also have "V3297" on it somewhere. If so, it could be a batch of heads for "spares stock". Link to comment Share on other sites More sharing options...
MarkDeTriomphe Posted January 27, 2009 Author Share Posted January 27, 2009 97679 wrote:Does it also have "V3297" on it somewhere. If so, it could be a batch of heads for "spares stock".Like this?Note the exhaust valve with rather unusual flow characteristics :-/. Think I'm beginning to remember why I removed the head in the first place. Link to comment Share on other sites More sharing options...
Nick Jackson (2) Posted January 27, 2009 Share Posted January 27, 2009 That's it but I'm not sure exactly what it means. I found a reference on this:-http://web.mit.edu/blang/www/Cylinder-Heads.xlsSee row 17 Link to comment Share on other sites More sharing options...
PHOENIXGT6 Posted February 11, 2011 Share Posted February 11, 2011 Hi, The 2500 'S' head IS a low comp' rat' @ 8.5 - 1. Cheers. Link to comment Share on other sites More sharing options...
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