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Post  ian1954 Thu Dec 01, 2016 2:48 pm

The crankcase on this is strange. It is in two parts and the front end is bulky with very little webbing.

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Post  GallopingGhostler Thu Dec 01, 2016 2:59 pm

Design is as such so ball bearings could be fitted easily?
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Post  Ken Cook Thu Dec 01, 2016 3:28 pm

I'd be very curious to see that engine stunt. I know it came in different versions such as ringed and ABC. I would also like to add, they were extremely well made and no pennies pinched.
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Post  GallopingGhostler Thu Dec 01, 2016 3:47 pm

It's a nice looking engine, no doubt it would be a good runner.
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Post  Mark Boesen Thu Dec 01, 2016 4:52 pm

These were the 'Chevy small block' of .40 R/C engines in the 80's-90's, well made, easy to needle and great power. The FSR series was copied by Thunder Tiger (Magnum) and sold by the thousands. But for a U/C engine not so much, they would be on the heavy side and unless you did some major re-porting you'd need to run it in a two-stoke mode with a big diameter, small pitch prop.
I'd guess and say it was a cost/production thing with the two piece case. Later O.S. engines went to a one piece and i remember claims of RPM gains by the one piece case being more rigid? I planted a .40 FSR one time and was able to replace the front end only (with a Magnum part) and save the engine.
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