cockerstar Posted October 6, 2008 Share Posted October 6, 2008 I've been searching, but still haven't been able to find the answer to my question so thread time it is. Is there any way to determine which kind of head gasket I have without pulling the head? My 240 came with a rebuilt engine, but it was on the stand and still is. I've checked everything over to make sure it looks good and the only thing I have left is to determine which headgasket I have so I can come up with a ballpark figure for my compression ratio. Engine is an l24 with flat-tops and an e31 head. I'm getting in the ballpark of 9.3:1 for a 1mm hg and 8.5:1 for a 2mm hg. Does this sound about right? Quote Link to comment Share on other sites More sharing options...
Challenger Posted October 6, 2008 Share Posted October 6, 2008 Cant you calculate the thickness by finding the psi of one of the cylinders and then using the chamber cc, piston dish cc (in your case 0), and then bore/stroke? Quote Link to comment Share on other sites More sharing options...
turboboost Posted October 6, 2008 Share Posted October 6, 2008 Cant you calculate the thickness by finding the psi of one of the cylinders and then using the chamber cc, piston dish cc (in your case 0), and then bore/stroke? That wouldn't take worn piston rings, leaking valves etc into play. Quote Link to comment Share on other sites More sharing options...
cockerstar Posted October 6, 2008 Author Share Posted October 6, 2008 My engine is still on the stand and everything has 0 miles on it so there shouldn't be any wear to take into consideration. Compression testers are known to be horrible inaccurate because their main necessity is precision, so that would have to be taken into consideration. That would also involve having the engine installed and running Quote Link to comment Share on other sites More sharing options...
woldson Posted October 6, 2008 Share Posted October 6, 2008 Pull the block. Heehee;) Quote Link to comment Share on other sites More sharing options...
blue72 Posted October 6, 2008 Share Posted October 6, 2008 Can you get some micrometers onto a bit of gasket that sticks out beyond the head and block? Then you could determine roughly the uncompressed height of the gasket. Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted October 6, 2008 Share Posted October 6, 2008 Is it a MLS one? If not i would suspect just an oem one or a felpro. If it is a MLS there will be little tabs around the outside of the head that have little rivits in them. You should be able to get a pair of calipers on that part and check. Quote Link to comment Share on other sites More sharing options...
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