OS 10 FP,FSR, LA etc
 

What are the differences between OS .10 FP, FSR and LA?
The LA is easy to spot but how can one distinguish between the FP and FSR?

RE: OS 10 FP,FSR, LA etc
 

Basically, they're all fairly similar. They were plain-bearing, non-ringed engines. All have Schneurle porting, which is where the .10 FSR got the "SR" part of its designation. It was named the "FSR" to distinguish it from the Pet .099 that was a crossflow ported engine.

The .10 FP got its designation because it was styled to conform to the FP-series of engines. And the .10 LA was changed in the same way. They are all very close in power and operation. The .10 FSR and .10 FP can be told apart by looking at their castings. It will have the designation molded into it.

RE: OS 10 FP,FSR, LA etc
 

Thanks, when did it turn into ABN technology?

RE: OS 10 FP,FSR, LA etc
 

Sometime in the 1980's to early 90's.