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1. [Healeys] 4 Cyl Compression Measurement (score: 1): Author: "Jack Newton" <jmnewt@comcast.net>; Date: Tue, 1 Dec 2009 11:05:07 -0700; Do any of you list participants have a good estimate of the compression readings (psi) that one should get on a 4 cyl rebuilt 100-4 BN-1engine with new rings, pistons, valves, etc. Engine is just ass; /html/healeys/2009-12/msg00032.html (7,114 bytes)
2. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Oudesluys <coudesluijs@chello.nl>; Date: Tue, 01 Dec 2009 20:24:45 +0100; Generally you will not get a proper reading on the compression from an engine that has not been run in. Kees Oudesluijs NL Jack Newton schreef: _______________________________________________ Support; /html/healeys/2009-12/msg00037.html (7,866 bytes)
3. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: "Rich C" <richchrysler@quickclic.net>; Date: Tue, 1 Dec 2009 18:07:34 -0500; Just as an aside, as I understand it, standard pistons for the Hundred were 7.5 to 1 ratio. The Le Mans kit pistons were offered in 8.1 to 1 or 8.5 to1 Rich Chrysler ________________________________; /html/healeys/2009-12/msg00052.html (8,010 bytes)
4. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: "Greg Lemon" <glemon@neb.rr.com>; Date: Tue, 1 Dec 2009 17:56:21 -0600; For what it is worth when I rebuilt my 100 engine with .060" over 8.5/1 pistons and Le Mans cam I got readings in the neighborhood of 165-170 psi across the four. At 8.0/1 I would assume you owuld be; /html/healeys/2009-12/msg00054.html (7,594 bytes)
5. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: TERRY COLL <coll44@msn.com>; Date: Wed, 2 Dec 2009 14:01:04 -0500; Sorry, but I'm not following the math here. Atmospheric pressure is 14.7 psi (at sea level) so a compression ratio of 8.5 should yeild appx. 125 psi. Assuming I'm missing something, can anyone splain; /html/healeys/2009-12/msg00086.html (9,349 bytes)
6. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Bob Spidell <bspidell@comcast.net>; Date: Wed, 2 Dec 2009 20:16:10 +0000 (UTC); Compressing a gas causes it to heat and (try to) expand, raising pressure beyond nominal. There are formulas for computing the total compression, but I'm to lazy to google it right now. bs -- Bob Spi; /html/healeys/2009-12/msg00089.html (7,892 bytes)
7. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Bob Spidell <bspidell@comcast.net>; Date: Wed, 2 Dec 2009 21:26:42 +0000 (UTC); Found a link: http://en.wikipedia.org/wiki/Compression_ratio Look at: " Fault finding and diagnosis" bs -- Bob Spidell - San Jose, CA Compressing a gas causes it to heat and (try to) expand, raising; /html/healeys/2009-12/msg00090.html (7,947 bytes)
8. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Oudesluys <coudesluijs@chello.nl>; Date: Wed, 02 Dec 2009 23:28:25 +0100; Allthough there are ways to compute the final pressure, it is very complicated and probably not very accurate. You have to take into account pressure loss through leakage, heat exchange air/cilinder/; /html/healeys/2009-12/msg00091.html (9,849 bytes)
9. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Richard Ewald <richard.ewald@gmail.com>; Date: Wed, 2 Dec 2009 14:37:35 -0800; Don't forget that everyone assumes their compression gauge is accurate. The truth is it could be off by who knows how many PSI. I've seen two gauges disagree on the same engine by more than 20lbs. Wi; /html/healeys/2009-12/msg00092.html (9,784 bytes)
10. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Bob Spidell <bspidell@comcast.net>; Date: Wed, 2 Dec 2009 22:39:54 +0000 (UTC); True, but the original question was '... compression ratio of 8.5 should yeild appx. 125 psi ...' The short answer is 'Ideal Gas Law.' bs -- Bob Spidell - San Jose, CA Allthough there are ways to com; /html/healeys/2009-12/msg00093.html (9,573 bytes)
11. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Chris Dimmock <austin.healey@gmail.com>; Date: Thu, 3 Dec 2009 23:03:21 +1100; I totally agree with Kees "Most important is that all cilinders show the same pressure within ca. 5% of each other and that there is no significant oil burning or crankcase pressure." A Healey engine; /html/healeys/2009-12/msg00100.html (10,926 bytes)
12. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Bob Spidell <bspidell@comcast.net>; Date: Thu, 03 Dec 2009 05:47:33 -0800; _______________________________________________ Support Team.Net http://www.team.net/donate.html Healeys@autox.team.net http://autox.team.net/mailman/listinfo/healeys http://www.team.net/archive; /html/healeys/2009-12/msg00102.html (8,154 bytes)
13. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Alan Seigrist <healey.nut@gmail.com>; Date: Thu, 3 Dec 2009 22:12:49 +0800; Just another note on this: compression is more or less self correcting once you get over 500 rpms, so regardless of how good or bad your rings are, you will have plenty compression for the engine to; /html/healeys/2009-12/msg00103.html (8,489 bytes)
14. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Bob Spidell <bspidell@comcast.net>; Date: Thu, 03 Dec 2009 06:38:08 -0800; _______________________________________________ Support Team.Net http://www.team.net/donate.html Healeys@autox.team.net http://autox.team.net/mailman/listinfo/healeys http://www.team.net/archive; /html/healeys/2009-12/msg00105.html (8,451 bytes)
15. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: warthodson@aol.com; Date: Thu, 03 Dec 2009 10:22:46 -0500; The compression readings will also vary depending upon wheather or not they were taken with the throttle opened or closed. Gary Hodson _______________________________________________ Support Team.Net; /html/healeys/2009-12/msg00106.html (8,401 bytes)
16. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: TERRY COLL <coll44@msn.com>; Date: Thu, 3 Dec 2009 10:58:12 -0500; Makes sense! Thanks Bob! Terry Coll Compressing a gas causes it to heat and (try to) expand, raising pressure beyond nominal. There are formulas for computing the total compression, but I'm to lazy t; /html/healeys/2009-12/msg00108.html (9,165 bytes)
17. Re: [Healeys] 4 Cyl Compression Measurement (score: 1): Author: Oudesluys <coudesluijs@chello.nl>; Date: Thu, 03 Dec 2009 17:32:27 +0100; Compresion readings should always be taken with the trottle fully open. Kees Oudesluijs warthodson@aol.com schreef: _______________________________________________ Support Team.Net http://www.team.ne; /html/healeys/2009-12/msg00113.html (8,780 bytes)

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