It's a good rule of thumb because you're not liable to see all eight cylinders suffer the same dramatic excess wear.
Keith Tanner Flyin' Miata [EMAIL PROTECTED] http://www.flyinmiata.com <http://www.flyinmiata.com/> 1-800-FLY-MX5s (orders) 1-970-464-5600 (tech) ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Monday, October 27, 2008 2:10 PM To: Keith Tanner Cc: [email protected] Subject: RE: NMC - How to figure "perfect" compression for a compression check? I've seen that a lot.. but it's flawed.. if all read 50psi dead one, I'm fine? No... so at what point is it fine? 100psi? 120? 180? This isn't a Miata question, but an LT1 SBC question.. but it applies to everything. If you are looking at a motor (any) how do you know what the normal reading ought to be? Mathematically I would think it's CR x 14.7, but that comes out very low... Wallyman "Keith Tanner" <[EMAIL PROTECTED]> "Keith Tanner" <[EMAIL PROTECTED]> 10/27/2008 04:06 PM To <[EMAIL PROTECTED]>, <[email protected]> cc Subject RE: NMC - How to figure "perfect" compression for a compression check? The easiest thing to do is check for consistency. If all four are close, that's a good sign. Keith Tanner Flyin' Miata [EMAIL PROTECTED] http://www.flyinmiata.com <http://www.flyinmiata.com/> 1-800-FLY-MX5s (orders) 1-970-464-5600 (tech) ________________________________ From: [EMAIL PROTECTED] [ mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, October 27, 2008 1:15 PM To: [email protected] Subject: NMC - How to figure "perfect" compression for a compression check? Ok, so if a guy wanted to figure out what the "perfect" lossless compression measurement is on a motor, how does one go about it? i.e. somebody tells you to "Do a compression check"... you say "ok, what values dictate good?".. they respond back with some arbitrary number somewhere in the high 100's.. and that's my question: Every motor should have an ideal reading, how do you figure that out? I assume you deal with bore/stroke/compression ratio/head gasket thickness/domed-dished-flat top piston and chamber size and through some magical formula you get a reading of xxx psi is possible? Google is letting me down on this one... Wallyman
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