Spark Plug pics and compression test results 4 years after rebuild

[70charginglizard]

Decided to pull the plugs out on the lizard and check the compression on it before I pull the covers over it and put it way for the winter.

Here are the results.



Cylinder no. 1.....145 PSI

[70charginglizard]

Cylinder no. 2......140 PSI

[70charginglizard]

Cylinder no 3.....140 PSI

[70charginglizard]

Cylinder no 4.....140 PSI

[70charginglizard]

Cylinder no. 5....150 PSI

[70charginglizard]

Cylinder no. 6 140 PSI

[70charginglizard]

Cylinder no 7....150 PSI

[70charginglizard]

Cylinder no. 8.....140 PSI

[70charginglizard]

So what do you think? I know cylinder 8 plug looks a little wet but thats just because they were not firing when I was compression checking and the fuel got in them a bit.
Spark plugs looked pretty good to me except for no 6 and 7 (carbon deposits) and maybe 3 and 8 ? (little carbon on sides)

Still having that overheat issue posted earlier.

[Chryco Psycho]

looks good to me the compression is even & the plugs are as well
is the pcv valve connected to the carb base or the rear intake runner ? it could be coloring the rear plugs
 

[70charginglizard]

looks good to me the compression is even & the plugs are as well
is the pcv valve connected to the carb base or the rear intake runner ? it could be coloring the rear plugs
 

pcv valve on my 440 goes in the carb base at the front and connects into the top of the driver side valve cover

[Chryco Psycho]

that is where it should be

[Challenger340]

Some questions , if you don't mind.

How are you doing the compression test ?
Carb wired "open" ?
All 8 plugs out ?
4 bumps only per hole ?
1 st bump, 75 % of the 4 th and final bump ?

What Intake manifold and camshaft are you running ? What Pistons ?

Overall looks pretty good !

[70charginglizard]

Some questions , if you don't mind.

How are you doing the compression test ? with this...see attached photo
Carb wired "open" ? no. why would I have to do that when compression checking. Never heard of that one before.
All 8 plugs out ? No,  I took them out one at a time. checked the compression and them put that plug back in and went on to the next one. does that make a difference?
4 bumps only per hole ? I thought you ran the motor as many bumps as you could till the compression tester stopped moving up?
1 st bump, 75 % of the 4 th and final bump ?

What Intake manifold and camshaft are you running ? What Pistons ? Crane cam (Very similar to a six pack purple cam) and stock pistons/rings.

Overall looks pretty good !

[Challenger340]

Wiring the carb wide open, with all 8 plugs out and the ignition disabled, gives a constant cranking speed, consistent across all 8 cylinders for the purposes of comparitive testing.
4 bumps only, the first being 75 % of the fourth and final, is relating strictly to the rings, and their sealing.

If you continue to keep cranking, the engine will act as a compressor, and eventually keep building pressure like the one in the garage for filling a tire.
Just nicer on the 4 only thing to plot the effective cylinder pressure as per your cam timing to try and look at the heating problem you mentioned, but no matter.

[70charginglizard]

Good info. I'll remember this next time. I done for the year pulling the plugs outta that pig for now.

thanks

[Runner]

If you continue to keep cranking, the engine will act as a compressor, and eventually keep building pressure like the one in the garage for filling a tire.

that wont happen, the exhaust valve opens and dumps the presure out the exhaust puipe and not into a sealed can.