Richard71 Posted November 26, 2017 Report Share Posted November 26, 2017 I don't have a standard untouched cylinder head to compare with, so can anyone confirm if the combustions chambers in the attached pic have been re-shaped? Quote Link to post Share on other sites
GT6M Posted November 26, 2017 Report Share Posted November 26, 2017 its been modded, as the plug side ridges ev gon awol Note, unless its been shaved, it,ll ne down on CR as opposed to an OE,n Only realistic way to check is t,burette the chambers to find oot just hoo much CCs are needed t,fill them up M Quote Link to post Share on other sites
Guest ntc Posted November 26, 2017 Report Share Posted November 26, 2017 Yep looks like 10.1 Quote Link to post Share on other sites
Richard71 Posted November 26, 2017 Author Report Share Posted November 26, 2017 Thanks for the replies, it's the "re-shaped" combustion chambers I'm interested in, I know it's been skimmed, ported & polished, what in addition to GT6M's observation has been done to theses chambers that can be seen with the naked eye? Richard. Quote Link to post Share on other sites
astontr6 Posted November 26, 2017 Report Share Posted November 26, 2017 +2 Has been modded. What do the ports look like, has the casting roughness gone as per the tops of the combustion chambers? What do the valve seats look like? Bruce. Quote Link to post Share on other sites
Guest ntc Posted November 26, 2017 Report Share Posted November 26, 2017 Will this help? Quote Link to post Share on other sites
PaulAA Posted November 26, 2017 Report Share Posted November 26, 2017 Richard Side-by-side comparison with a 219019 casting. This one is skimmed and measured at just over 9:1 (the crease in the combustion chamber touches the face approx 2/3 across the water way - red line). Shape looks pretty similar, though. Paul Quote Link to post Share on other sites
Richard71 Posted November 26, 2017 Author Report Share Posted November 26, 2017 Thanks for the pics, the side by side pic is a big help, thanks Paul for going to the effort. Richard. Quote Link to post Share on other sites
PaulAA Posted November 26, 2017 Report Share Posted November 26, 2017 Richard No problem - hope it helps. Paul Quote Link to post Share on other sites
Guest ntc Posted November 26, 2017 Report Share Posted November 26, 2017 (edited) edit Edited November 26, 2017 by ntc Quote Link to post Share on other sites
john.r.davies Posted November 26, 2017 Report Share Posted November 26, 2017 Been fitted with larger valves too - they "shouldn't" overlap. ntc - a CR froma single photo! IM-pressive! John Quote Link to post Share on other sites
PaulAA Posted November 27, 2017 Report Share Posted November 27, 2017 edit Neil Why have you removed the two images you posted? Paul Quote Link to post Share on other sites
GT6M Posted November 27, 2017 Report Share Posted November 27, 2017 (edited) Having a good look at that pic, like 400X zoom, it looks like the margin es gon between the seats. Compare area between seats on the 2 pics Paul bunged up on his, ye can see heed matterial, on your, it cannae be seen And, cant see any evidence of an insert Which means that valve had pocketed, and been cut back, hence having to bung in a bigger valve Has all chambers got same valves, and been cut the same cutting ex valves too wide { Not too deep, 2 totally diff things, depth an width } this could well lead to a burnt / cracked area between the 2, as the seats are open, and ex gasses flow across the ..dip / cut oot bit, on overlap a common affliction in my findings M Edited November 27, 2017 by GT6M Quote Link to post Share on other sites
Richard71 Posted November 28, 2017 Author Report Share Posted November 28, 2017 Having a good look at that pic, like 400X zoom, it looks like the margin es gon between the seats. Compare area between seats on the 2 pics Paul bunged up on his, ye can see heed matterial, on your, it cannae be seen And, cant see any evidence of an insert Which means that valve had pocketed, and been cut back, hence having to bung in a bigger valve Has all chambers got same valves, and been cut the same cutting ex valves too wide { Not too deep, 2 totally diff things, depth an width } this could well lead to a burnt / cracked area between the 2, as the seats are open, and ex gasses flow across the ..dip / cut oot bit, on overlap a common affliction in my findings M They're all the same as per attached pic. I'd have to remove a set of valves to clarify your point, but I doubt there'll be an issue. Quote Link to post Share on other sites
john.r.davies Posted November 28, 2017 Report Share Posted November 28, 2017 As I noted above, Post 11, they have been enlarged to the max! John Quote Link to post Share on other sites
Nick Jones Posted November 29, 2017 Report Share Posted November 29, 2017 Might just be the effect of 3 angled seat cut? 219016 head pictured further up seems to have been modded with the larger exhaust valve fitted? Normally they have a smaller exhaust valve Nick Quote Link to post Share on other sites
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