ORIGINAL: proptop

I didn't know the O.S. 4 stroke car engines went back quite that far Greg...

Even still, with a sealed rocker cover, I wonder how effective the upper end lube was/is?
Those 4 stroke engines will turn waaayyy more r.p.m. than an airplane 4 stroke will, I know that, so valvetrain lubrication would be even more important.
If the top end of the motor is sealed, how much can actually get up there?

We have a rather famous (in the R/C car world...CRC Racing ) bunch of guys here in Rome, and I recall seeing a few of the .26's in buggies, and one .40 in a truck several years ago, but IIRC they had durability problems of one sort or another.
Next time I'm over there guess I'll have to ask what happened to the O.S. 4 strokes in this area.

http://www.teamcrc.com/crc/