I started installing new pistons and I can not find or remember if the piston slot and piston pin bolt goes toward the cam or away from it.
When I took the old ones out I told myself to remember how they went.

I'm going to blame this on a senior moment.

Thanks for the help.
Joe

Wrist pin bolts towards the cam

Bolt and slot toward the cam KB

I put mine in with the bolt toward the cam and the slot away from the cam.
Norm

Bolt on the rod is on the cam side, the slot will be on the opposite side. Some pistons have an arrow on them pointing forward.

I ordered pistons from Snyders - there was no inication on which side the slot goes on the pistons. I called Snyders and they said to put the slot toward the cam. The Mac's catalog says the same thing. This is the opposite of conventional auto rebuilding practice. The slot should be on the minor thrust surface, not the major. Snyders could not give me a reason why they put the slot on the cam side - they said that there engine rebuilder always did it that way. Langs says the opposite - put the slot away from the cam. Put the wrist pin bolt toward the cam. I will go with conventional wisdom and Lang's advice. There are threads in this forum about people scuffing pistons in newly rebuilt engines. Perhaps this is part of the problem.
Brian
13 Runabout
25 Speedster

Joe. The slot on a piston is always on the minor thrust side. on a Model T it should be installed away from the camshaft.
In any engine the minor thrust side is always in the direction of rotation, major thrust is always against rotation.

If you think about it -the engine spins clokwise CW [standing in front of car] when the piston is coming doun on the power stroke the crank just past top dead center as it moves doun
the conecting rod moves to the RIGHT at the crank end [here is where the comfusion is] thereby puting the most force on the piston [as gas expands from the top] on the cam side [left]

If the engine ran CCW the the force will be on the right --as i remenber----Hope this helps
Larry

Solid side towards the cam. Ford practice is rod pinch bolt toward the cam.
Dan

What is the engine for Joe?

Thanks everyone.

Ned, 23 Roadster.
Joe

Well, I could be wrong. I just wrote down how I do it. They seem to run ok when I do them this way: http://youtube.com/watch?v=RweQ1ICPCVI
http://youtube.com/watch?v=AzqHjvfejSc