what is good engine compression on a good engine. Mine hasn't much power,soots the plugs and runs rought. Have checked the fuel sys,new plugs,points
new. kicking my b-t, used to run great. ??????????????
engine compresson
- 1crosscut
- Posts: 877
- Joined: December 25th, 2010, 7:22 pm
- Body Type: 82-A
- Model Year: 1929
- Location: Lincoln, NE
Re: engine compresson
65 lbs is pretty close to what one finds on a fresh engine.
Lower compression is okay but the main thing is to have the compression be pretty close between all of the cylinders.
Have you pulled the movable plate out of the distributor to see if the flexible wire underneath it is frayed, broken or shorting out? This will cause many of the symptoms you are experiencing.
Torque the intake/manifold bolts to be sure there is not a vacuum leak there. Also make sure the carburetor is tight to the intake manifold.
Lower compression is okay but the main thing is to have the compression be pretty close between all of the cylinders.
Have you pulled the movable plate out of the distributor to see if the flexible wire underneath it is frayed, broken or shorting out? This will cause many of the symptoms you are experiencing.
Torque the intake/manifold bolts to be sure there is not a vacuum leak there. Also make sure the carburetor is tight to the intake manifold.
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Dave
Dave
- Chris Haynes
- Posts: 2203
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Re: engine compresson
Sooty plugs are caused by running too rich.
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- Joined: August 11th, 2013, 4:25 pm
- Body Type: 82-A Platform
- Model Year: 1928
- Location: Hamilton, Mich.
Re: engine compresson
sooty plugs = rich mixture. Flow test the carb jets. I redid all of mine and runs and starts great now. Was worth the time and effort.
KVO
Dec. '28 AA
Dec. '28 AA
- macswoods
- Posts: 313
- Joined: May 4th, 2009, 1:20 pm
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- Location: Wilhoit, Arizona
Re: engine compresson
Where do I get info on how to do the flow test ?
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- Posts: 753
- Joined: August 11th, 2013, 4:25 pm
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Re: engine compresson
try this to startmacswoods wrote:Where do I get info on how to do the flow test ?
http://modelabasics.com/carb%20basics%2 ... carbBasics
KVO
Dec. '28 AA
Dec. '28 AA
- macswoods
- Posts: 313
- Joined: May 4th, 2009, 1:20 pm
- Body Type: 82-A
- Model Year: 1929
- Location: Wilhoit, Arizona
Re: engine compresson
WOW , WOW---- Great article thank you ! Still working on the problem . Mac.....