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Tuning
Advice:- How to Degree a Cam
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Degree wheel must be
on PTO side of motor.
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Find absolute TDC and
set degree wheel to 0. Best to use 360 increment degree
wheel 0/90/180/270, or covert numbers to reflect these
readings.
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Set deflection gauge
on exhaust lifter to read 0. Eliminate rocker and push
rod for most accurate reading.
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All readings must be
in the proper or normal rotation of the motor.
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Start with the
exhaust side of motor.
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Rotate motor till
4.4196mm before max lift. Record this number. Should
read around 204 degrees.
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Rotate motor for max
lift. Now slowly rotate till you read 4.4196mm after max
lift, record this number. Should be around 308.
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Now move deflection
gauge to intake side. Rotate motor to TDC again and
adjust deflection gauge to read 0. Again rocker and push
rod must be eliminated for most accurate reading.
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On intake side,
rotate motor till 4.4196mm before max lift. Record this
number. It should read around 64 degrees.
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Rotate motor to max
lift. Now slowly rotate motor till you read 4.4196mm
after max lift, record this number. It should be around
158.
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From these numbers we
now have on the exhaust side, (204+308/2)-360x-1=104. So
exhaust centreline is 104 degrees.
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On the intake side we
have, 64+158/2=111. So the intake cam centreline is 111
degrees.
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So from these two
numbers we see the true cam centreline is
111+104/2=107.5
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To determine if you
are advanced or retarded you would take 111-107.5=3.5
degrees advanced of cam centreline on intake side.
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Now from what we have seen on the GX160K1 or T1 motor
anything from 3 to 4 degrees advanced of centreline on
the intake side works very well for top ended tracks.
3.75 would be a very good number to shoot for.
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