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In this video I make a start on the rebuild of my tractor puller engine. I’m using fresh pistons this time so they need to be modified to lower the compression ratio. To get the compression ratio down to the required amount I needed to remove metal from the valve cut outs. Removing it from the valve cut outs also has the benefit of more piston to valve clearance now that the cam has been given more lift.
To machine some material away, I set the pistons up on the milling machine. Plan A didn’t work as the cutter I ordered turned out to be the wrong size. So, I had to come up with a plan B. I set the piston up so the valve cut out was inline with the spindle then offset the table and used the rotary table to achieve the 45mm diameter cut needed.
After all the pistons were done on the milling machine, I used the lathe to turn 1mm off the diameter of the piston down to the top ring, this is done to stop the piston from seizing in the bore when the piston expands from the extra heat created by running a lot more power.
The block is then glaze busted to remove the surface rust from the bores and the top rings are placed in to measure the ring gap.
Hope you found this interesting.
Thanks for watching.