rake60
Well-Known Member
- Joined
- Jul 8, 2007
- Messages
- 4,756
- Reaction score
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With John's original thread on this engine filling up, I thought I'd we should
split it up a bit.
As soon as saw this engine I had to attempt it.
John's beautiful build was even more of an inspiration to give it my best
shot. My best shot just didn't get it. :-[ So I went into the damage
control mode. I found that the base and upright support were out of
square .005" To fix that I clamped the base to the mill table and dusted
the lower cylinder base to clean-up. Then in the same set up I skinned
across the upright support in the area where the upper cylinder mounts.
The second deviation was on the pivot bolts. I used standard 10-32
socket head bolt and fitted the cylinders with thin wall bushing that I cut
.005" longer then the cylinders to allow free rolling clearance.
Third deviation was the pistons. I made mine of plain 1018 cold roll steel.
Cut them for a snug fit, smeared them with toothpaste and turned the
engine over my hand until they'd lapped themselves in for a free turning
fit. Put the air to it the first time and it binds up tight. Out of shear
frustration I grabbed a can of wheel bearing grease that was near by and
smeared it on the pistons. Hooked the air to it again and it took off.
[ame]http://www.youtube.com/watch?v=cpP-PT_fC7o[/ame]
I'm not real happy with the final results. Might just have to give this one
another go from the beginning someday, but not soon. It has been the
most frustrating project I've ever done. :-\
Rick
split it up a bit.
As soon as saw this engine I had to attempt it.
John's beautiful build was even more of an inspiration to give it my best
shot. My best shot just didn't get it. :-[ So I went into the damage
control mode. I found that the base and upright support were out of
square .005" To fix that I clamped the base to the mill table and dusted
the lower cylinder base to clean-up. Then in the same set up I skinned
across the upright support in the area where the upper cylinder mounts.
The second deviation was on the pivot bolts. I used standard 10-32
socket head bolt and fitted the cylinders with thin wall bushing that I cut
.005" longer then the cylinders to allow free rolling clearance.
Third deviation was the pistons. I made mine of plain 1018 cold roll steel.
Cut them for a snug fit, smeared them with toothpaste and turned the
engine over my hand until they'd lapped themselves in for a free turning
fit. Put the air to it the first time and it binds up tight. Out of shear
frustration I grabbed a can of wheel bearing grease that was near by and
smeared it on the pistons. Hooked the air to it again and it took off.
[ame]http://www.youtube.com/watch?v=cpP-PT_fC7o[/ame]
I'm not real happy with the final results. Might just have to give this one
another go from the beginning someday, but not soon. It has been the
most frustrating project I've ever done. :-\
Rick