hello everybody,
I've been struggling to get my 235 running as smoothly as it should. All new ignition parts and the valves are adjusted to spec. I've been driving it for a while and it runs and pulls pretty good. She fires right up. But there has always been some exhaust popping under load and at higher RPM's. Also, she idles very smoothly when cold but when she's fully warmed up there is some miss fire type sounds...not constantly but every so often the engine sounds like it skips a beat. Another thing, every so often after running at high RPM/high speed for a while I notice a slight smell of antifreeze but I always assumed I overfilled the radiator because it does leak from the small overflow tube at the bottom sometimes.
I decided to do a compression test today and wanted to share the results with you and get some opinions what you think is wrong, because there definitely is something wrong. I did this test on a cold engine, choke and throttle wide open. I have not tried squirting any oil in the cylinders and trying it again to rule in our out bad rings.
Here are the results by cylinder. Note: all of the spark plugs looked great when I removed them.
#1 - 105 PSI
#2 - 120 PSI
#3 - 140 PSI
#4 - 130 PSI
#5 - 140 PSI
#6 - 130 PSI
I've read a lot of threads on this here about low compression between adjacent cylinders and I think I might have a bad head gasket between the #1 and #2 cylinders. The motor does not overheat and I see not evidence of coolant and oil mixing in the engine or radiator.
What do you guys think?
Last edited by jaydee5150; 02/22/2018 11:36 PM.
