 compression numbers, how bad are these |
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| mobymutt |
 Oct 8 2017, 06:46 AM
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#1
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Senior Member  Group: Members Posts: 553 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada  |
Just did a compression check, here's what I measured:
108, 120, 96, 85 I've got a stock 1.8L, but would like to build a 1911 or 2056 in the relatively near future. Hopefully I'll be ok for another year or so with the current setup. |
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| mobymutt |
Oct 8 2017, 08:31 AM
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#2
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Senior Member Group: Members Posts: 553 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada |
Full disclosure: I did just have the engine apart, but (for a number of reasons) I didn't replace the pistons, cylinders or rings.
There was actually a pretty big 'pocket' in one of the cylinder walls (looked like a casting void), so having at least one cylinder with low compression doesn't surprise me. Is there an actual spec for what the compression numbers should be on a good engine? |
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| rgalla9146 |
Oct 8 2017, 09:11 AM
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#3
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Advanced Member Group: Members Posts: 4,671 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None 
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QUOTE(mobymutt @ Oct 8 2017, 10:31 AM)  Full disclosure: I did just have the engine apart, but (for a number of reasons) I didn't replace the pistons, cylinders or rings. There was actually a pretty big 'pocket' in one of the cylinder walls (looked like a casting void), so having at least one cylinder with low compression doesn't surprise me. Is there an actual spec for what the compression numbers should be on a good engine? Uniform numbers is the goal. The actual number is dependent on engine configuration. |
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Posts in this topic
mobymutt compression numbers Oct 8 2017, 06:46 AM
914Sixer Looks like time to rebuild. Go for the 2056. Oct 8 2017, 07:02 AM DM_2000 Do a leak down test, that wil let you know where t... Oct 8 2017, 07:13 AM rgalla9146 A leakdown test should be done as well. It will gi... Oct 8 2017, 07:48 AM
malcolm2
The compression test should be done after a p... Oct 8 2017, 04:14 PM Morrie
Full disclosure: I did just have the engine apar... Oct 8 2017, 10:56 AM porschetub
Full disclosure: I did just have the engine apart... Oct 8 2017, 01:53 PM cuddyk If you separated the pistons and jugs and didn... Oct 8 2017, 02:27 PM DM_2000 I don't do the often repeated "add oil to... Oct 8 2017, 04:05 PM mobymutt Thanks to all for the responses (and patience, as ... Oct 8 2017, 04:17 PM Mark Henry Start saving some coin Matt, likely there's go... Oct 8 2017, 05:17 PM mobymutt
Start saving some coin Matt, likely there's g... Oct 8 2017, 06:42 PM injunmort consider the tangine racing cable set up rather th... Oct 8 2017, 05:23 PM mobymutt
consider the tangine racing cable set up rather t... Oct 8 2017, 06:39 PM |
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