camshaft identified

The left cylinder head was installed.
(note the bigger valves!)

The rocker assembly ultrasonically cleaned and fitted.

With the valve gaps set - then the difference in measurements relative to valve versus cam follower becomes more obvious.

It now looks more like the cam is a fast road piper cam.

The cam was set to full lift on the inlet of piston 1 by measuring start and finish point of the dwell angle (12 degrees) and setting the crank angle to halfway in between.

The cam is then disconnected from the sprocket and the crank set to 112 degrees ATDC,
The cam then reconnected and new yellow alignment dots added (will drill later)

Monitoring the valve and crank angle now shows a close approximation to the fast road cam spec 24-68 68-24







references
http://www.pipercams.co.uk/pipercams/www/tech_camshaft_installation.php
http://www.pipercams.co.uk/pipercams/www/tech.php

What cam is it!

I don't know what the camshaft is, I suspect a fast road cam.

It has a "P" and number 401 and 112.
I hope it means Piper cam
0.401" lift & 112 degrees inlet full lift.
But probably wrong.

I started by measuring the camshaft with the dial guage on the cam followers.

I got a 60 degree overlap and 173 degree duration.

I set the camshaft to be in the middle of the overlap at TDC






Then checked the timing again against the crank.
Measurements then didn't seem quite so obvious.

I began to worry I had a full race cam.
Thought best to install the cylinder head and measure on the rockers.

Tomorrow... maybe.