Converting 1.7 Roller Rockers

shoalcracker

Registered User
Playing around today and noticed the position of the stud hole was off centre in the trunion of the rocker.

The offset was approx. .042 towards the rod side.

Flipping the trunion over (pin) we moved the stud mounting point .082 towards the valve.

Checking the travel off the valve we had changed it by .100.

Looks like flipping the trunion over changes 1.7's to 1.8's (approx)

Geometry wasn't perfect on valve but not totally wacked.

Any reason why I can't mill the trunion to receive the nut on the other side and have both 1.7 and 1.8 rockers?

Paul
 
Playing around today and noticed the position of the stud hole was off centre in the trunion of the rocker.

The offset was approx. .042 towards the rod side.

Flipping the trunion over (pin) we moved the stud mounting point .082 towards the valve.

Checking the travel off the valve we had changed it by .100.

Looks like flipping the trunion over changes 1.7's to 1.8's (approx)

Geometry wasn't perfect on valve but not totally wacked.

Any reason why I can't mill the trunion to receive the nut on the other side and have both 1.7 and 1.8 rockers?

Paul

Sorry but your math is wrong. You aren't changing the pivot point within the rocker itself, you are only changing it's position relative to the valve.
 
DD

I'll check again tomorrow.

I had the original mount offset towards the rod 41 thou in the trunion.

Flipping it put the offset 41 thou towards the valve.

Thought that lengthened the fulcrum 82 thou on the rod side. It showed as 100 thou at the valve with the roller going off centre.

Paul
 
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