|
| Author |
Message |
    
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 946
Registered: 07-2002
| | Posted on Sunday, September 14, 2014 - 06:55 pm: | 
|
I've been working on this inverted Racine twin, some of you may remember the crankshaft I made for it. I started cleaning the block and realized the cylinder had been repaired with epoxy. It looks like someone was trying to bore it and gave up. About 3 1/2" of the cylinder was in good shape, I figured I could start honing from there and get a good in line bore. This engine is headless, doesn't even have a plug at the head to run a boring bar through as Iv'e sen on a lot of headless engines. Setting up a boring bar would have been rough and it would have been a long reach, makes me wonder what kind of equipment they had to bore them in 1895. I ordered some 70 grit stones for the Sunnen hone, used them dry. It was slow going at first, the top didn't get round until .110" over, after that I could increase the pressure and it went faster. Worked about 5 hrs yesterday, got to .160" over, another .030" this morning and the sleeve was ready to go in. Installed it and honed it to within .001". I have to make a tool to chamfer it, that will make it less obvious, it should blend in well. 
beginning honing
 |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 947
Registered: 07-2002
| | Posted on Sunday, September 14, 2014 - 07:02 pm: |
|
>.110" over, cylinder is finally round.
Ready for the sleeve
Hone & sleeve
Sleeve installed, ready for final honing & chamfering.
 |
ernie
Senior Member
Username: ernie
Post Number: 1865
Registered: 01-2002
| | Posted on Sunday, September 14, 2014 - 07:11 pm: |
|
Nice work! |
david_doyle
Member
Username: david_doyle
Post Number: 22
Registered: 03-2013
| | Posted on Sunday, September 14, 2014 - 07:22 pm: |
|
Thanks for showing us what is possible! |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 948
Registered: 07-2002
| | Posted on Sunday, September 14, 2014 - 08:44 pm: |
|
Thanks, it was a lot of honing, I could have brought it to a machine shop with a Sunnen power hone but it's nice to say I did it. |
raa
Senior Member
Username: raa
Post Number: 83
Registered: 02-2007
| | Posted on Sunday, September 14, 2014 - 10:11 pm: |
|
My hats off to you JB that was quite a project
Dick |
johnny
Senior Member
Username: johnny
Post Number: 481
Registered: 03-2006
| | Posted on Sunday, September 21, 2014 - 11:09 am: |
|
Beautiful Job as always, JB
Look forward to seeing it run. |
|
|
|
|
