Got my CL350

It does sound like the cam timing is retarded slightly since the piston is reaching TDC before the cam reaches the intended orientation. The angle at the crank is twice that at the cam and it looks like it's off by about the same angle as between LT and LF, which I think is 5° at the crank.

Thinking about the cam sprocket, I believe there are 33 teeth, so one tooth is equivalent to about 10.9° at the cam, 21.8° at the crank. Thinking in these terms it's off by about a ¼-tooth on the cam sprocket. Doesn't seem like a huge amount in those terms.

Here is a thread about cam profiles that might be helpful. I'm curious what others have to say about this.
 
tmross said:
ya 174/180 with Lisle gauge. not that far over the 170 spec.
Click to expand...
At least that kind of confirms the idea that decking the head may have caused a change to the compression chamber volume and contributed to the slight cam timing discrepancy.

It really bugs me that the motor is not performing when fully warm.

What about trying colder plugs, i.e., BR9ES?
 
One more potentially cockamamie theory.
  • Your cam timing investigation shows that the crank reaches TDC before the cam reaches its designated position. Valve action is delayed.
  • If the ignition timing is based on the crank, then the exhaust valve opens later on the power stroke relative to the spark and more heat is retained in the combustion chamber.
I'm not sure if retarding the timing slightly would help, but maybe the colder plugs would help compensate a little if this is what's going on.

I'd be tempted to retard the timing a degree or so and try colder plugs.
 
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