372 with 385 top end

[Dub11]

Well it looks like if I'm going to do this with the 660 piston it's going to be with a two piece cylinder. I've never done a two piece so it would be a great first time project.
I can use the 385 piston if I have sleeves made from milling a 13mm pin to the inside diameter of 12mm and cutting a couple pieces to length. Clips with big ears should keep the sleeves in place if I go that route. It's a scary thought to go using those sleeves like that but the pin itself is what gets the tension from the bearings so the sleeves might not create any extra force or wear on the clips.

McMaster Carr jas some different sleeve material.

Does anyone have a vid of pulling a crank apart?

Tim aka Dieselfitter has some pics.

 

[Red97]

Does anyone have a vid of pulling a crank apart?

This ain't rocket science... lol bet that spree is still running till it gets run over by a mule cart.

 

[Chainsaw Jim]

I scored some nice head blanks today.

I weighed three pistons, the 51.4mm 372, the 660, and couldn't weigh the 385 because it's to heavy and maxes out my little scales. My not as accurate postal scale puts it at 105 grams.
The 372 is 92.88 grams w/rings no pin.
The 660 is 94.27 grams w/rings no pin and after removing a little from the pin boss to fit the 372 crank.
The 385 piston feels so much heavier that I'm now not sure I even want to risk using it.

 

[Magic_Man]

This ain't rocket science... lol bet that spree is still running till it gets run over by a mule cart.

I would say he's done that a few thousand times. Lol

 

[Chainsaw Jim]

One step closer...

 

[smokey7]

Oh man this is going to be good. Please keep it up I can't wait

 

[Wagnerwerks]

Where do you guys get the head blanks? My locals have nothing that big and I'd like to do a 272/359 like your last with a 2 pc.

 

[mdavlee]

Ebay

 

[Wagnerwerks]

Duh. Lol. Ty Mike.

 

[Chainsaw Jim]

 

[mdavlee]

I like buying 3/4-1" thick already cut in the diameter I need. I've been finding pairs or even 3-4 pieces the same size pretty cheap.

 

[Wagnerwerks]

Yeah... How thin do you think you can go on say a 45-52 mm saw? Think 1/2" would do?

 

[mdavlee]

The plug depth and chamber side will come into play that thin. If you do not drop much into the bore it should work.

 

[P.M.P.]

Awesome thread but aren't 2pc heads a FAD

Isn't it about whats on the inside that mattersor is that what she said

 

[Chainsaw Jim]

Awesome thread but aren't 2pc heads a FAD

Isn't it about whats on the inside that mattersor is that what she said

I suppose it's possible.
In this case I went past the point of no return when I modded the brand new oem 660 piston to fit the 372 rod end before realizing it was too short for the job. The only way to make it work was to take some off the top of the cylinder. It was a rookie mistake which turned out to be a blessing in disguise...I hope. I say that because it put the numbers in a good range for a pipe saw.

 

[LBracing]

What are good numbers for a pipesaw ?

 

[Chainsaw Jim]

What are good numbers for a pipesaw ?

That's a great question for this particular set up. I'll find out if my hunch is right or not when I get it together to run it.

 

[p61 western]

Bump what's going on with this project?

 

[Frank bierce]

Bump what's going on with this project?

Forgot about this project!! Glad you bumped it

 

[p61 western]

Forgot about this project!! Glad you bumped it

Hopefully Jim Comes around and gives us a update.