94vertluvr Posted July 20, 2010 Report Share Posted July 20, 2010 Hey, can anyone give me the cylinder compression reading for a 'healthy' 3.4L? Thanks in advance!!! Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted July 20, 2010 Report Share Posted July 20, 2010 normal is 100psi or more, with no more than a 30% difference between the highest and lowest cylinder. Quote Link to comment Share on other sites More sharing options...
94vertluvr Posted July 20, 2010 Author Report Share Posted July 20, 2010 Thanks Robert!!! normal is 100psi or more, with no more than a 30% difference between the highest and lowest cylinder. Quote Link to comment Share on other sites More sharing options...
kuntzie Posted July 20, 2010 Report Share Posted July 20, 2010 noemal should be well over 100, like 195-200psi id consider 160 to still be "ok" Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted July 20, 2010 Report Share Posted July 20, 2010 that may be, but according to alldata, 100PSI is the service limit. anything less is cause for reuild/inspection. Quote Link to comment Share on other sites More sharing options...
94vertluvr Posted July 20, 2010 Author Report Share Posted July 20, 2010 So should I be looking for 160 out of a low mileage engine then at least for assessment purposes to make sure this is indeed a low mileage engine? noemal should be well over 100, like 195-200psi id consider 160 to still be "ok" Quote Link to comment Share on other sites More sharing options...
Galaxie500XL Posted July 20, 2010 Report Share Posted July 20, 2010 Well, it's a good indication that the rings are good, and the valves aren't burnt...always good things. As far as using a compression check to verify low mileage, that I'm not as certain about... A good visual inspection, compression test, and if possible seeing it run starts you off on the right foot. Even then, occasionally you might get burned. Quote Link to comment Share on other sites More sharing options...
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