ORIGINAL: rinnander
John,
I have 2 RCV .91 4 stroke that I bought for this plane, for some reason I do not like the nitro type engines. I put one of the RCV in a F4U CMP model it works well but messy with the excess oil.
Are you running the proper amount of lubricant with your RCV?
One of the guys at my local field flies a .91 RCV and I notice it runs pretty clean.
I think he's running about 15% synthetic lube with very little castor blend.
I think they are interesting engines, all the advantages of a four stroke with no valves
to bother with and the external dimensions of a two stroke.
Happy flyin', Oscar