Little China Girl

[T.Roller]

Your motto can be "No Bad Jugs Here!"

By god

 

[dall]

pics of the no bad jugs here

 

[T.Roller]

pics of the no bad jugs here

 

[huskihl]

Dem ain't bad

 

[Stump Shot]

Derail

 

[dall]

That's better but I need their numbers if I'm gonna port them

 

[Stump Shot]

That's better but I need their numbers if I'm gonna port them

36-24-36

 

[dall]

36-24-36

lol phone numbers lol

 

[Stump Shot]

lol phone numbers lol

BR-549 tell 'em junior sent ya!

 

[T.Roller]

BR-549 tell 'em junior sent ya!

Lmao

 

[Stump Shot]

Made up a mandrel out of a 2.25" aluminum round stock. 56mm one end, 54mm the other.




Until cylinder just slid over.

 

[Stump Shot]

Not being too sure about this, took and put a small indentation into the top of the cylinder for the tail stock to run in.



Took and marked one corner with a sharpie (hear they're all the rage with the best Porter) and took a measurement.

 

[dall]

Not being too sure about this, took and put a small indentation into the top of the cylinder for the tail stock to run in.

View attachment 80100

Took and marked one corner with a sharpie (hear they're all the rage with the best Porter) and took a measurement.

View attachment 80106

you have a fancier tool than a sander though

 

[Stump Shot]

Started turning, no turning back now. Took off a total of .045" that will yield a squish of .025" with a .020" gasket.



Was using a HSS cutter, it didn't care to cut through the plating. Used diamond ball burr to get the edge chamfered.

 

[Stump Shot]

you have a fancier tool than a sander though

No belt sander, like the pros use, someday...

 

[Stump Shot]

Marked the squish band by rotating the mandrel in the cylinder. Made marks about 2/3 or more of the band. Seeing as there's no more room to go down am going to have to call this acceptable, and leave it alone.

 

[huskihl]

No belt sander, like the pros use, someday...

I turn down the area between where the bottoms of your 54 and 56mm bases reach on your mandrel. Say your cylinder uses 3" of mandrel on each end of a 10" mandrel. That's 6" total. You have 4" in the middle that's unused. I turn that area down about 1/4", plus about 1/4" up into the cylinder area. It leaves room for a triangle shaped carbide to cut the chamfer. Sometimes it still leaves a burr in the nikasil and it's tough to get the cylinder off. Getting the unused part of the mandrel out of the way allows room for a needle file to clean up the chamfer

 

[Stump Shot]

I turn down the area between where the bottoms of your 54 and 56mm bases reach on your mandrel. Say your cylinder uses 3" of mandrel on each end of a 10" mandrel. That's 6" total. You have 4" in the middle that's unused. I turn that area down about 1/4", plus about 1/4" up into the cylinder area. It leaves room for a triangle shaped carbide to cut the chamfer. Sometimes it still leaves a burr in the nikasil and it's tough to get the cylinder off. Getting the unused part of the mandrel out of the way allows room for a needle file to clean up the chamfer

Good to know, will do next time when it's for reals.

 

[Stump Shot]

Slammed her back together again. Now the flywheel hits the Cross logo. Squish with a paper gasket is .0245" one side, .0255" the other. So the band is out of square only .001". Might be I can sand it a bit with the mandrel. Otherwise it came in spot on for target of .025" finish squish.
Free port is at .047" on the exhaust port. Think I will try turning one more piston to see if this can be tightened up or eliminated. There is a little play at BDC between the crank and piston skirts. Not sure how tight this can be made, reckon I'll find out though.
Hopefully the crankcase can stay together now.

 

[tree monkey]

just nip the corners of the skirt