correct cylinder pressure

BruceHarless · 05-26-2014, 11:48 AM

1989 2pg rebuilt engine -- recently I put a 50-over piston in this fully rebuilt engine. With a compression gauge in the spark plug hole, it shows 100 lb quickly and holds it quite well. I often see "120 lbs" as the target -- is 110 lbs a problem that will affect it starting/ running?
Bruce

pachanga90 · 05-26-2014, 12:07 PM

Are you holding the throttle wide-open during cranking(if you have the cable unhooked).Are your crankseals in good condition? Is the piston in correctly(there is a front and rear).Did a ring get damaged during installation? Is the piston correctly fitted in the bore(did it get bored oversize or even egg-shaped due to using a flex-hone).I don't remember the desired range for compression on a 2pg,but definitely over 110(I think the spec.may have been 135-150?).Any of these alone or in combination will drop compression.Hope this helps.

BruceHarless · 05-27-2014, 11:32 AM

This 100 lbs is after it stopped running. When I first rebuilt it, it did closer to 120lbs, but I figured 100 probably indicated some seating of the rings, etc. Not so?
Bruce

jlloyd · 05-27-2014, 09:16 PM

I may be wrong but I think 1989 was a 3pg engine....

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05-26-2014, 11:48 AM	#1
BruceHarless Not Yet Wild Join Date: Dec 2013 Posts: 27	correct cylinder pressure 1989 2pg rebuilt engine -- recently I put a 50-over piston in this fully rebuilt engine. With a compression gauge in the spark plug hole, it shows 100 lb quickly and holds it quite well. I often see "120 lbs" as the target -- is 110 lbs a problem that will affect it starting/ running? Bruce
BruceHarless Not Yet Wild Join Date: Dec 2013 Posts: 27

05-26-2014, 12:07 PM	#2
pachanga90 I Refuse To Get Stuck!!! Join Date: Jun 2010 Location: Hilton,NY Posts: 5,427	Re: correct cylinder pressure Are you holding the throttle wide-open during cranking(if you have the cable unhooked).Are your crankseals in good condition? Is the piston in correctly(there is a front and rear).Did a ring get damaged during installation? Is the piston correctly fitted in the bore(did it get bored oversize or even egg-shaped due to using a flex-hone).I don't remember the desired range for compression on a 2pg,but definitely over 110(I think the spec.may have been 135-150?).Any of these alone or in combination will drop compression.Hope this helps.

05-27-2014, 11:32 AM	#3
BruceHarless Not Yet Wild Join Date: Dec 2013 Posts: 27	Re: correct cylinder pressure This 100 lbs is after it stopped running. When I first rebuilt it, it did closer to 120lbs, but I figured 100 probably indicated some seating of the rings, etc. Not so? Bruce
BruceHarless Not Yet Wild Join Date: Dec 2013 Posts: 27

05-27-2014, 09:16 PM	#4
jlloyd Getting Wild Join Date: Apr 2011 Posts: 91	I may be wrong but I think 1989 was a 3pg engine.... Sent from my iPhone using Tapatalk
jlloyd Getting Wild Join Date: Apr 2011 Posts: 91

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