Got a 72 B-300/6
Engine runs rough with no power.
Got approximately 1 115-120
2 115-120
3 85 -85
4 115-120
5 105-115
6 115-120

after 3 or 4 revolutions with throttle and choke open.

engine burns no oil and does not smoke. I have a point system and am checking it out now. Carburetor is a one bbl 1920 (i think)

QUESTION with these comp numbers, should i be looking at a rebuild or just a good vlv job. Engine was rebuilt several yrs ago but details and components unknown. Have had to replace a couple of valves in the past as they were deformed and burnt.

thanks in advance

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FRCC
(9) slant six engines / + misc parts for same.
1969 D100 318 4 spd

Check valve lash on cylinder #3 first. If that's good, it looks like a valve on #3 is your problem.

Your numbers are dry-wet, correct?

CJ

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Part of Tyrde-Browne Racing

thanks cj
yep, checked lash today and found no tight valves. Adjusted all intake and exh

what do you pros use to determine if rings need replacing?
I have placed oil in the cylinders and the effect was small during comp testing

_________________
FRCC
(9) slant six engines / + misc parts for same.
1969 D100 318 4 spd

no didn't check wet today the variations was just when i check them more than once.
Will check dry and wet tomorrow and post. How much diff would indicate rings? Or, how much diff should there be?

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FRCC
(9) slant six engines / + misc parts for same.
1969 D100 318 4 spd

The compression check number would be a night and day difference (I've seen a 10psi cylinder go to 45 on the wet check...LOL)...

The next step would be a leakdown test that would determine if it was cylinder/valves/gasket (all of the above).

-D.Idiot

forgot to mention oil pressure is 50-60 lbs at warm idle.
will also do leak down tomorrow as well as wet comp, that should tell me whats wrong i guess.

_________________
FRCC
(9) slant six engines / + misc parts for same.
1969 D100 318 4 spd