Cam Timing

[neilv]

As some of you may have seen in previous threads my 2000 Griff 500 has had a problem with pinking. Originally the timing was just retarded to remove the problem, but this has killed the performance.

TVR Power have said that winding the timing back is not the way to do it, they have also said to make sure that the Cam timing is correct, for which the car is duly booked in.

Here is the question though; what way could the Cam timing have anything to do with the pinking?

Regards,

Neil V

[neilv]

I only picked this car up in March and it was pinking on the test drive, the previous owner (who has been spoken too) has said that he never noticed any performance/pinking problems and it has never had any surgery of any type.

Hoe does the Cam timing would affect the compression? Surely, at some measure of degrees before detonation, all the valves will be closed? I appreciate how performance would be affected if the exhaust and inlet are not at the correct offset.

All I can think is that there is a suspected cam timing problem AND the timing marks are all wrong. Meaning that the timing was always to far advanced (hence the pinking), but winding it back to the proper offset kills the power because of the Cam timing? But not being an engineer I really am guessing.

Neil V