Hi listers (and Hugh in paticular if you are out there)
I gave my best shot at indexing my TR6 engine on Saturday. My problem
is I seem to be getting conflicting results using two measurements.
Method 1: Instructions included with the Piper 270 cam say to turn the
crank to 112 ATDC, find the maximum lift point of #1 intake and chain
the two things together at that point.
Method 2: Measure the lift of #6 intake and exhaust and find the
crossover point where they are both open the exact came amount (0.038"
in my case) meaning #1 are closed, put #6 and #1 at TDC and chain the
two together at that point.
My problem: Do method 1 and then measure the intake and exhaust of #6
at TDC. The intake is open 0.040" and the exhaust is open 0.035", not
equal amounts. Disassemble and do method 2. Rotate the crank and cam
until #1 intake is fully open and measure 111 ATDC, not 112 as it should
be.
Am I being too picky about this? Is 0.005" or 1degree within reason?
Does the assymetry of this cam mean I cannot do Method 2 to begin with?
Rob in Ottawa
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