Re: [Chrysler300] Compression pressure , 300H

["Flathead Engineering" <flatheadeng@xxxxxxxxxxx>]

Rick really knows his stuff as he a second generation Chrysler guy and a 
professional mechanic. Suprised that he didn't mention the altitude effect 
on compression readings here in Denver. Makes about a 15% difference and 
definitely affects jetting. Some of you may have gotten a taste of that at 
the Golden meet.
----- Original Message ----- 
From: "RICK AND DEBBIE CLAPHAM" <rixpac@xxxxxxx>
To: <mgoodknight@xxxxxxxx>; "Rich Barber" <c300@xxxxxxx>
Cc: <mmoore8425@xxxxxxx>; <chrysler300@xxxxxxxxxxxxxxx>
Sent: Friday, November 09, 2012 6:22 AM
Subject: RE: [Chrysler300] Compression pressure , 300H


>
> I agree with everything written on the compression testing. The pressures 
> seem a little low. We have diagnostic machines that direct you to needed 
> repairs, your battery condition, ignition primary and secondary. Timing 
> and spark plug burn time, cylinder contribution. Combustion efficiency 
> through all ranges. These machines are like and external computer 
> monitoring system that our old cars just didn't come with and the new cars 
> have today. I have been using these machines for several years now and 
> have found some interesting needed repairs. Cam and lifter replacement, 
> worn distributor, wrong timing and vacuum advance totals. needed metering 
> rod change in primary. After analysis repairs I picked up two miles per 
> gallon and performance plus lower emissions. These machines, with the use 
> of a chassis dynamometer can yield even greater accuracy. The results can 
> be printed out take with you.  Rick
>
>
>
>
>
>
> To: c300@xxxxxxx
> CC: mmoore8425@xxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
> From: mgoodknight@xxxxxxxx
> Date: Fri, 9 Nov 2012 11:44:12 +0000
> Subject: RE: [Chrysler300] Compression pressure , 300H
>
>
>
>
> Thanks for your research Rich,
>
> That's a good write-up on compression testing. One might conclude from 
> that reading that too much emphasis is often put on the results of 
> compression testing and that proper (valid) compression testing is not 
> often accomplished.
>
> Much can be learned about the condition of an engine from studying the 
> results of a valid test, but inaccurate diagnostics are more commonly the 
> main outcome.
>
> My recommendation is to avoid such a test unless you have strong evidence 
> of a problem that can be easily identified by a test. If the engine runs 
> well and performs properly, don't do the testing. You might see results 
> that will cause you undue worries.
>
> Marshall Goodknight, engine failure analyst
>
> Please note: message attached
>
> From: "Rich Barber" <c300@xxxxxxx>
> To: "'Michael Moore'" <mmoore8425@xxxxxxx>, "'300'" 
> <Chrysler300@xxxxxxxxxxxxxxx>
> Subject: RE: [Chrysler300] Compression pressure , 300H
> Date: Thu, 8 Nov 2012 22:47:28 -0800
>
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