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Banned
Join Date: Mar 2004
Posts: 183
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Low Compression causes..
Have a low compression cylinder at #2 on a 2.7L (w/CIS) Apart from a piston ring being chipped or broken which is what I expect - what else might cause this condition? 15K on a rebuild (apparently/supposedly).
Doug C |
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02-07-2005, 11:04 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Valve seating issues: Poor valve / seat re-grind or too thin a margin on the valve face, weak spring pressure, chunk of carbon on the valve.
You should do a leak-down test and this will tell you what's happening.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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02-07-2005, 01:24 PM
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Banned
Join Date: Mar 2004
Posts: 183
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I feel ignorant asking this but, can a leakdown test be performed while the engine is not installed in the car?
Doug C |
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02-07-2005, 01:39 PM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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It should be at operating temp, so yes ideally it should be in the car. Try not to sweat too much here. Just find out what's causing the issue. It may be something simple.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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02-07-2005, 01:45 PM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,492
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Have you checked the valve gap? A valve to tight could also cause low compression.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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02-08-2005, 05:36 PM
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Banned
Join Date: Feb 2003
Location: So California
Posts: 3,787
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Do a leakdown or have it done for you. Engine does not have to be in car or be at operating temp. THe leakdown will identify the source of the low compression, ie valves or rings or both. Do the test and go from there.
THe problem you identified is a gross problem, ie low compression. Do not let the relatively small differences between a hot leakdown and a cold one prevent you from doing the test that will still tell you whats wrong with the engine. Last edited by snowman; 02-09-2005 at 06:34 PM.. |
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02-09-2005, 06:30 PM
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