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Author Topic: Compression Ratio  (Read 1763 times)

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Offline tbucketjack

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Compression Ratio
« on: February 23, 2013, 01:45:11 AM »
I just did a compression test on my stock 1971 2.0. I got: 145, 147, 145, 145 on a warmed up engine. Then I did the wet (oil) test and got:   145, 152, 145, 150  I normally get blue smoke on start up and she will puff out sometimes while idling. Is this compression too low? Could the smoke be from valve guides or the seals? Thanks     

Offline wbacon8780

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Re: Compression Ratio
« Reply #1 on: February 23, 2013, 04:20:05 AM »
Valve seals will cause the blue puff. Seals are no good and oil gets by them and leaks into the cylinder, when you start it you get your blue puff.

Offline fast64ranchero

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Re: Compression Ratio
« Reply #2 on: February 23, 2013, 12:14:39 PM »
As stated above, it's valve stem seals, The  2.0L has a flooded top end and the valve stem seals are an issue if old or not installed correctly.
You can do them without pulling the head by making a fork tool to compress the valve springs.
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Offline D.R.Ball

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Re: Compression Ratio
« Reply #3 on: February 23, 2013, 08:34:02 PM »
Your compression is fine , change your valve seals.......

Offline tbucketjack

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Re: Compression Ratio
« Reply #4 on: February 24, 2013, 12:51:52 AM »
Just want to thank you for the inputs. Valve stem seals it will be. Thanks again. :)