I was going to buy 2 RCV engines because of the cowling constraints. The first one is RCV 120 and the next is RCV 90.
Anyone has any experience about this new engines in terms of their reliability and ease of operation (I hate tweaking carb controls all day long)?
Thanks a bunch.

Not personally, but I do know one of their UK display pilots and spoke to the manufacturer at the main trade show last year. The biggest point that they make and it applies to your cowling constraint, is that these are still aircooled engines. Just because they are slimline and can fit inside a Spitfire or Mustang cowl does not mean they will run that way. They still need a big airflow over them to keep cool. If you can arrange for ducting or whatever to ensure unrestricted airflow just as you would for any other engine then you should be ok.

Harry

RCV Cooling.

With our regular engines the air entering the cowling blows through the fins removing the hot air between them. The fins on the RCV engines are at 90 deg to the airflow thus preventing the cool air from blowing through them. Do these engines still cool efficiently?

Why didn't I think to ask at Toledo?

Ed S

Wind, I have a RCV .90 going into the new Hangar Nine P-51. My experience so far is limited to breaking it in and then running it just for fun. It is not a tweaker like an OS, it seems to be a set it and forget it engine. If you take a good look at the pictures you'll notice they have proportionally much more cooling fin area than a standard four stroke, even the prop driver has sizable cooling fins.
I'll be using a four bladed 17x10 Zinger at about 4,200 rpm max.
Ed, this is something that may change my mind about using the RCVon the P-51 is if I don't feel the airflow is sufficient. You will be pleased and surprised at the smoothness of these engines.