15eren Posted September 3, 2015 Report Share Posted September 3, 2015 The engine in my TR6 has engine-number (CC 28XXX HE). Must be an early engine I have measured the thickness of the head including gasket to 80,75 mm or 3,23 inches. Can anybody tell what the Compression ratio is on this engine? Tage Quote Link to post Share on other sites
Peter Cobbold Posted September 3, 2015 Report Share Posted September 3, 2015 (edited) Tage, It is extraordinarily thin. 80.75mm is 3.18 inches. If we take the gasket off your measurement we have 3.145" to compare with the table. http://www.goodparts.com/tech_docs/TR6_Compression_Ratio.html "each 0.01 inch removed equals 1cc ". So compared with the 10.5:1 head you have a chamber volume of 3.336 - 3.145 = 0.191 which is 19cc less. So your chamber volume is 39.8 - 19 = 20.8cc That gives a compression ratio (416.3 + 20.8 ) / 20.8 which is: 21:1 !!! its a diesel.. Thats very approximate, you need to measure the volume with a burette. Even so either I've got the sums wrong or your measurement is too small..... Peter If your measurment was 87.5mm = 3.445" then the table gives Comp Ratio 9:1 Edited September 3, 2015 by Peter Cobbold Quote Link to post Share on other sites
15eren Posted September 3, 2015 Author Report Share Posted September 3, 2015 (edited) Hi Peter Sorry, sorry. Completely wrong measurement. The correct is 87,10 mm (3.42 inch). New batteries in the meter made the difference :-). Tage Edited September 3, 2015 by 15eren Quote Link to post Share on other sites
Peter Cobbold Posted September 3, 2015 Report Share Posted September 3, 2015 Tage, No worries ! - a bit of excercise keeps my brain from fading too fast...hopefully. Peter Quote Link to post Share on other sites
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