Hunt For Low Compression (1 Viewer)

Joined
Jan 4, 2011
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I’d probably do a leak down test next. This can tell you if you have a ring problem, a head gasket problem, or a valve problem.
 
Joined
Nov 28, 2015
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Scottsdale, AZ
I am in Tucson AZ (2389 MSL), and I was hauling my Wife and I up to Sedona (4350 MSL) haha.

I was getting 110psi to 105psi for my compression numbers across the board.

I have not check my rings yet, I need to tear it down the engine a little further to see those but do not want to unless absolutely necessary.
My low mileage, original 60 can’t pull 50mph up 17 to Sedona. Just an FYI, I tuck in the right lane with the semi’s with my hazards on at 40-45mph.
 
Joined
Jan 4, 2011
Messages
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Vermont
my 210,000 mile 84 with 31" tires, 4 speed, and original gearing can usually hold about 50mph on Killington Pass in Vermont. I have managed to tow a trailer over the less steep side and maintain 45 mph. But I've never had to let off the throttle on the way up because I was exceeding the speed limit. Climbing passes on I70 in Colorado was 3rd gear, 40 mph in with the big trucks.
 

GLTHFJ60

Rum Runnin'
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Apr 18, 2005
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X3, leakdown test. My guess the valves/seats are worn, or the valves are adjusted too tight. Worse than that, rings weren't sized correctly.

This is all post-break in period, right? I wouldn't expect the compression numbers to be awesome until after the rings have been bedded.
 

MoaByte

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Dec 13, 2014
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Moab
@GLTHFJ60 , I was just about to suggest to check the valve lash. I was able to add 3 inches Hg on my vac gauge by adjusting my neglected valves. .008 intake, .016 exhaust.
 

HemiAlex

TLCA #24987
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Sep 28, 2015
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Houston
326k with a known worn cylinder and a good tune. I Did 75 with my 4 speed and 33’s.

You need an immaculate tune up and a good gauge.
 

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