 Engine break in, Compression Changes |
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| newdeal2 |
 Dec 19 2004, 06:01 PM
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#1
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Unregistered  |
After about 20 miles of break in on my rebuilt 2.0 I did a quick compression check. When I first tested [right after run in] all of the cyliders were at about 120-130. Now they range from a tad over 100 to 130. Most are closer to 120. Is this a indicator it's time to adjust the valves?
Also... I noticed in one post that you remove all of the spark plugs when checking compression. I have been doing them one at a time. |
 
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| redshift |
Dec 19 2004, 06:04 PM
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#2
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Bless the Hell out of you!  Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869 |
Break-in:
20 minutes standing still @ 2500 rpm, turn off car, change oil, drive 500 miles, change oil, adjust thingys. There are variations, but that works. Hey, if it's cooled off, sure. M |
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| TheCabinetmaker |
Dec 19 2004, 06:08 PM
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#3
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I drive my car everyday Group: Members Posts: 8,325 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Yep, remove them all. Hold the butterfly in the throttle body open with a screwdriver (or other like object).
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| newdeal2 |
Dec 19 2004, 06:26 PM
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#4
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Unregistered |
Yep...I do think it's valve adjutment. It's running a tad rough at speed. Has plenty of power but gets choppy over say 3000 rpm. I also read that the type of cam I put in will change readings on tests due to the additional lift/durration.
Now that I am running points [short term] it's a pain getting everyting to mesh (IMG:style_emoticons/default/mad.gif) |
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| newdeal2 |
Dec 19 2004, 06:30 PM
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#5
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Unregistered |
redshift:
I did my break in based on the Wilson book. 2,000 for 20 min's and then on the road accelerate up to about 75% then engine break and repeat. It helps seat the rings in both dirrections. |
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| redshift |
Dec 19 2004, 07:07 PM
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#6
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Bless the Hell out of you! Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869 |
I don't think it's an engine mechanical problem causing choppy running... maybe one of the normal choppy problems... points... spark.. ground... etc..
Oh... carbs too.. M |
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| newdeal2 |
Dec 19 2004, 07:15 PM
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#7
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Could be...it was running pretty good and strong the first few runs and degraded from there. That's why I'm thinking mechanical but with these cars it could be anything, especially something worked loose, vacuum leak,another clogged injector, who knows. It's a trial and error, live and learn kind of deal.
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