Pinto Cam Timing
Stole this thread of the Westfield Web site, Interesting.!!!!
Dont really know whether this will turn out to be a word of warning for others about to check/adjust their cam timing, whether it was a school boy
error on my part, or something else. I will explain...
A few weeks ago I went round to a mates house to check/adjust his camshaft timing on his Pinto motor. He had armed himself with with the timing
figures obtained from Kent cams own website. Luckily, it quoted the lift at TDC figure (2.95mm), so I cracked on. After a few minutes finding exact
TDC and checking vlave clearances before adjustment, I was happy that the timing was spot on, and the engine was installed.
It fired up, and ran sweetly, except for a strange noise from the cambelt area. The noise has no real connection with the tale, other than I was
unhappy with the vernier pulley that was fitted at the time. The belt was running slightly off the back of the pulley (there was a gap between the
pulley and the belt guide), so I suggested that he obtained another, as the one fitted actually looked to be a home made affair from the amalgamation
of two standard pullies.
One genuine Kent Cams Alloy vernier later, and I was back resetting the timing. The pulley comes with a mark that aligns with the original timing mark
on the cylinder head. But to get the 2.95mm lift figure, I had to advance the pulley one tooth to get the timing spot on. The engine fired up again,
ran sweetly, and the cam belt alignment problem was cured.
However, the fact that I had to put the pulley a tooth out has been niggling me, so I went back round tonight and decided to recheck my work using the
'full valve lift' method. First I double checked my previous work, it appeared spot on. However, when I used the 'full valve
lift' method, instead of being at the recommended 110deg, it was set at a whopping 150deg!
So, I have now reset the timing using the latter method. This has meant I have had to put the cam pulley back the tooth I talked about above. Now, all
of the original marks line up, and according to the vernier, it is 2 deg advanced from the standard mark. To finish, I measured the part lift at TDC,
which is now 1.52mm.
So, what does the collective think? Maybe an error in the info on the Kent Cams website? I am missing something blatently obvious?
If nothing else, I know we can safely swing the cam timing around a few degrees...
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