[DUMBGRUNT]

I’m not an aircraft guy but enjoy things with pistons and pushrods...

Nice!

Curtiss OX-5

http://www.pilotfriend.com/aero_engines/aero_ox5.htm
Though the OX-5 bottom end was reasonably good, typically having a time-between-overhaul (TBO) of a few hundred hours, the valve gear was both fragile and troublesome. It had no provisions for lubrication other than grease and oil applied by hand. Fifty hours was the typical limit of the valve train

27 days x 24 hrs = 648 hrs!

See it run!
http://www.youtube.com/watch?v=eDd94xowWfs

[Yosemitest]

I was thinking it was a Five cylinder radial engine, not a V-8 air cooled engine.
Thanks.

You might like this.

[Yosemitest]

Here's an ASP FS400AR Radial Engine Part 3 someone overhauled and shows running.
Watch and read their comments below.

I first ran this engine in December 2006. *See Parts 1 & 2 of this video series.*

After about 1 hours total running time I read on the internet that some fellow ASP radial owners had experienced catastrophic failures of the connecting rods, resutling in sever damage to the engine. I decided to take my engine backplate off and insepct it. Sure enough, I found a linkpin that had broken. Fortunately for me I found it before the engine had gotten damaged.

I disassembled the entire engine. I sourced the needed spare parts, which are very difficult to obtain in the USA. A fellow modeler made a custom set of linkpins for me. And I set to polishing the entire engine. I have made several customized engines, and this was the biggest job so far!

As it happens sometimes, I got sidetracked on other projects and this engine sat in a box, in parts, for 2.5 years. In May of 2010, I decided to get it back together.

Here is the end result. A gorgeous looking ASP FS400 AR radial engine that runs perfect and sounds awesome. Peak RPM was 6800+, and idle was 1620. The prop is a light weight wood, Master Airscrew 18x10. The fuel was Powermaster 15%. Glow plugs are "Fox Miracle Plugs" 4-stroke plugs. The glow driver is a Microsens Glow5P.