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     1. 03:47 PM - Re: compression values (R.C.Harrison)
 
 
 

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Time: 
03:47:56 PM PST US
From: 
"R.C.Harrison" <ptag.dev@tiscali.co.uk>
Subject: 
compression values
      
      
      Hi! Martin
      25% down on the leak down test is maximum permissible on any cylinder..
      Otherwise IMHO the Compression test is barely worth the bother.
      Regards
      Bob H 
      
      Robt.C.Harrison
      
      
      -----Original Message-----
      From: owner-jabiruengine-list-server@matronics.com
      [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
      avidflyer01
      Sent: 08 June 2007 23:28
      Subject: JabiruEngine-List: compression values
      
      <vegayacht@club.fr>
      
      hi folks,
      I would like to find out what are typical compression values on a
      recent 2200; could those who measured their compressions give me their
      results, together with approx engine hours and age?
      
      as I have a problem with a leaky valve in one cylinder I carried out
      some serious tests on my engine and found that on the three "good"
      cylinders I have only 122psi (8.6 bar). I've heard about one engine
      that at 300hrs had as much as 160psi (11.2bar), yet I also heard that
      my 122psi is a reasonable compression.
      
      My compressions were taken with a warm engine, one sparkplug per
      cylinder removed, throttle fully open, good battery. Engine has 100
      hrs, 2 years old (hyd lifters).
      I also did a leak down test: pressure drop on good cylinders were 9%,
      11% and 14%; it was 35% on the bad one.
      
      thanksfor your help
      
      Martin
      Avid Flyer / Jab powered
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=117380#117380
      
      








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