Search String: Display: Description: Sort:

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Compression\s+Ratios\s*$/: 15 ]

Total 15 documents matching your query.

1. Compression Ratios (score: 1)
Author: "Peter J. Thomas" <pjthomas01@snet.net>
Date: Thu, 26 Mar 1998 21:05:51 -0500
Ok, here is where I show my stupidity. Bought my first compression guage. It is calibrated in psi. How do I determine the compression ratio? Ie. how do I convert x psi to n:1? Peter Thomas
/html/shop-talk/1998-03/msg00144.html (7,391 bytes)

2. Re: Compression Ratios (score: 1)
Author: Berry Kercheval <berry@kerch.com>
Date: Thu, 26 Mar 1998 19:49:01 -0800
Well, atmospheric pressure is 15 psi (close enough for this calculation) so 10:1 compression ratio will give you 150 psi. However, only a perfectly sealing engine will give you 150. figure at least
/html/shop-talk/1998-03/msg00145.html (8,096 bytes)

3. Re: Compression Ratios (score: 1)
Author: "Peter J. Thomas" <pjthomas01@snet.net>
Date: Thu, 26 Mar 1998 23:48:38 -0500
Does this mean the gauge should start at 15 psi? I getting close to these numbers for an 9:1 engine, so I'm in good shape. Thanks. On a side note, I bought a screw in model with a rubber hose. The fi
/html/shop-talk/1998-03/msg00146.html (9,587 bytes)

4. Re: Compression Ratios (score: 1)
Author: cak@dimebank.com (Chris Kantarjiev)
Date: Thu, 26 Mar 1998 22:11:27 -0800
You don't. You compare the numbers you get across the engine. If they are within 10% high to low, you go away happy. Someone is almost certain to say "oh, 1 atmospher is 14.7 psi, so just divide by 1
/html/shop-talk/1998-03/msg00149.html (7,977 bytes)

5. Re: Compression Ratios (score: 1)
Author: Trevor Boicey <tboicey@brit.ca>
Date: Fri, 27 Mar 1998 01:57:04 -0500
Not to mention that this relies on a cam that is perfectly tuned for "starter cranking speed" which of course never happens. Very hot cams can give really low compression readings because of overlap
/html/shop-talk/1998-03/msg00150.html (8,561 bytes)

6. Re: Compression Ratios (score: 1)
Author: Mark Bradakis <mjb@cs.utah.edu>
Date: Fri, 27 Mar 1998 00:05:21 -0700 (MST)
how do I convert x psi to n:1? The short answer is you don't. Test each cylinder, see what the range of values might be, and hope that there isn't much more than a 10% to 12% spread. Or 15%, or maybe
/html/shop-talk/1998-03/msg00151.html (9,128 bytes)

7. Re: Compression Ratios (score: 1)
Author: "Tony Clark" <lotus.tony@airmail.net>
Date: Thu, 26 Mar 1998 21:55:46 -0600
do I n:1?
/html/shop-talk/1998-03/msg00152.html (7,975 bytes)

8. Re: Compression Ratios (score: 1)
Author: "Tony Clark" <lotus.tony@airmail.net>
Date: Thu, 26 Mar 1998 22:27:00 -0600
do I n:1? No stupidity here . . . if you didn't know better, a compression gauge _should_ read in compression ratios. shouldn't it? Unfortunately, it's not that simple. The number that we know as "co
/html/shop-talk/1998-03/msg00153.html (8,801 bytes)

9. Re: Compression Ratios (score: 1)
Author: Trevor Boicey <tboicey@brit.ca>
Date: Fri, 27 Mar 1998 03:19:19 -0500
...and if you have ZS/SU type carbs, lift the pistons! Jam them open with something large enough to not get sucked in. -- Trevor Boicey, Ottawa, Canada. tboicey@brit.ca, http://www.brit.ca/~tboicey/
/html/shop-talk/1998-03/msg00154.html (8,152 bytes)

10. Re: Compression Ratios (score: 1)
Author: Bob Hamilton <hamilton@navnet.net>
Date: Fri, 27 Mar 1998 07:43:13 -0400
Peter and others, I believe that the compression ratio has very little correlation the readings you will obtain from a compression gauge. The compression ratio is the ratio between the cylinder volum
/html/shop-talk/1998-03/msg00155.html (9,221 bytes)

11. Re: Compression Ratios (score: 1)
Author: Larry Hoy <larryhoy@ecentral.com>
Date: Fri, 27 Mar 1998 07:10:32 -0700
Mark is correct, here is the formula. Compression Ratio = (C - P + G + D + V) / (C - P + G + D) C = combustion chamber volume P = piston dome volume G = head gasket volume D = deck height volume V =
/html/shop-talk/1998-03/msg00156.html (9,175 bytes)

12. Re: Compression Ratios (score: 1)
Author: "Peter J. Thomas" <pjthomas01@snet.net>
Date: Fri, 27 Mar 1998 10:12:51 -0500
Thanks for all the replies. I suspected much of the theory but didn't have anyway to confirm it. Even if the was a little magically formula, I doubt the cheap little gauge is that accurately calibrat
/html/shop-talk/1998-03/msg00158.html (8,421 bytes)

13. Re: Compression Ratios (score: 1)
Author: Eric Murray <ericm@lne.com>
Date: Fri, 27 Mar 1998 08:18:41 -0800 (PST)
However as carbon builds up, the compression ratio does change, because the combustion chamber holds less volume. -- Eric Murray Chief Security Scientist N*Able Technologies www.nabletech.com (email:
/html/shop-talk/1998-03/msg00160.html (8,129 bytes)

14. Re: Compression Ratios (score: 1)
Author: Larry Hoy <larryhoy@ecentral.com>
Date: Fri, 27 Mar 1998 10:10:04 -0700
Ah, ha. Good point.
/html/shop-talk/1998-03/msg00161.html (7,770 bytes)

15. Re: Compression Ratios (score: 1)
Author: Mark Bradakis <mjb@cs.utah.edu>
Date: Fri, 27 Mar 1998 11:09:04 -0700 (MST)
Actually the formula I mentioned was for approximating the compression ratio from the psi reading of the compression tester. I certainly don't remember the formula off the top of my head, but I do re
/html/shop-talk/1998-03/msg00163.html (8,027 bytes)

Current List: 1 - 15
Page: [1]
This search system is powered by Namazu