Recent content by barrti

I have always been impressed with needle rollers as used in petroloil engines. They survive high loadings and rpm just fine. This means they only need scant lubrication especially considering the low power levels here 4stroke glow engines use journal bearings in the conrod and these rely on...

Nice idea but no, it clears the rod by quite a bit. I'm pretty convinced it is as rcdielrc says: it is there to use for a ring peg if the piston is used in a two cycle engine. The rod big end is located by the back plate and the crankshaft web. This is the usual arrangement for these overhung...

He didn't say which one. Yes mine ha a 23mm bore. My OS FS-40 has a similar piston too (with the lump). Cheers

Greg from rcdieselrc (YT) confirmed that the piston casting is used in two and four stroke engines. The lump is used for the piston peg location in a two stroke engine. He said that there is no orientation. I'll put it back with the lump under the exhaust valve in case it helps with heat...

I am rebuilding an OS FS-52 Surpass engine. Someone else has removed the piston so I was not able to mark it for orientation. I notice that there is a small rectangular casting lump inside the piston, under the piston crown (See image below). It seems like a deliberate feature, so I am...