twigworker
Jedi Trainee
Offline
I am in the middle of doing a normal valve adjustment on an 85 XJ6 and started wondering about the possibility of advancing the intake cam a few degrees. The thought occurred to me that the factory may have dropped the cams back a little from earlier specs in order to help with the emissions, something like the MG factory did to their single carb cars.
The car runs well enough as it is being set with OEM cam and ignition timing but I just thought that a little tweek might be a pleasant surprise for the owner.
My question is, has anyone had any real world experience with advancing the cams on these emission cars, and if so how far did you go and did you deal both cams or only the intake?
Jack
Edit: I am thinking 4 cam degrees or so, and probably both cams. Does this sound abvout right?
The car runs well enough as it is being set with OEM cam and ignition timing but I just thought that a little tweek might be a pleasant surprise for the owner.
My question is, has anyone had any real world experience with advancing the cams on these emission cars, and if so how far did you go and did you deal both cams or only the intake?
Jack
Edit: I am thinking 4 cam degrees or so, and probably both cams. Does this sound abvout right?