55 restoration

[simplex1957]

I started to restore my 55 a few weeks ago. I'm going to try to attach some pics.

[Ricks]

Looking good!

 Why the insulating paint on the inside of the case?  Do you think it will hold up to the gas/oil mix?  It is hard to tell from the picture, but did you paint the area that the transfer port is in?

[simplex1957]

Yes I painted the transfer port and the intake track. I think it will not only seal
the case but maybe flow a little better. I also radiused the flywheel where the
port comes through. IDK, will see?

[pd]

Yes I painted the transfer port and the intake track. I think it will not only seal
the case but maybe flow a little better. I also radiused the flywheel where the
port comes through. IDK, will see?

Hopefully , the paint you used will resist any breakdown .

Did you bore the flywheel port bigger or simply radius the hole ?

Pete .

[simplex1957]

It's an industrial paint like on electrical windings and its baked on.
I just cleaned up the flywheel port and radiused it a little.

[Ricks]

I enlarged the hole in the crank on one of my motors slightly, and also polished it and cleaned up the port.  Hard to tell with out back to back tests, but this motor runs really strong.

What is your clearance now that you have painted the intake port? I don't remember what the spec should be, but I would guess about .005.

[Bruce]

That opening in the crank....exposes and closes an intake port?

[Mike Sal]

Gyptal is the sign of an old fart working on this project!!!  The inside of my Kaiser & Model T motors are coated with it!!!
Mike Sal

[Mike Sal]

There is a cross hole in the crank which lines up with the port for the carb.  As  the crank revolves, it "opens" the channel for the fuel mixture to be drawn into the crankcase.  As the port closes, the piston is traveling down to push the fuel thru the transfer ports to the combustion chamber.
Mike Sal

[simplex1957]

What is your clearance now that you have painted the intake port? I don't remember what the spec should be, but I would guess about .005.
[/quote]

The shaft is .981 and the port is .990 with paint so that would be .0045 on each side.

[pd]

There is a cross hole in the crank which lines up with the port for the carb.  As  the crank revolves, it "opens" the channel for the fuel mixture to be drawn into the crankcase.  As the port closes, the piston is traveling down to push the fuel thru the transfer ports to the combustion chamber.
Mike Sal

Here's a drawing of the crank to help you see what Mike described .
The arrow points to the 'cross hole ' .



If you remove the carb and look into the port while turning the crank , you'll see the cross hole .

[pd]

I enlarged the hole in the crank on one of my motors slightly, and also polished it and cleaned up the port.

Rick ,

Exactly which hole did you enlarge and by how much ? And , which port did you clean up ?

Pete .

[admin]

I ran a sanding scroll on the inside of the crank.  I probably only opened it a few thousands of an inch. The port on the crank I just cleaned up the casting.  I felt this hole was already big enough.

I have spoken to Wayne about what I did, and he told me the next time he has cranks made, he is going to have a couple done with a larger diameter so he can put a larger hole down the middle.   I also told him to stroke the crank .010 or so for a little more displacement.

If we could make another horsepower or two out of these motors, these bikes would be more rideable on a 45 mph street!

[simplex1957]

Gyptal is the sign of an old fart working on this project!!!  The inside of my Kaiser & Model T motors are coated with it!!!
Mike Sal

Heeey!  I resemble that remark!

[pd]

I have to agree . The crank 'center' bore seems to be a bottleneck , compared to the carb intake port and the cylinder transfer ports . Although , the Tillotson MT carb venturi might be a closer match . I don't know what the throat of the Carpenter carb measures .