ORIGINAL: Ken Cz
I posted the below info on another thread then noticed it was a very old one that may not get much response. So here it is again - Thanks for the feedback in advance.
I am running the OS 200 mounted about 45 deg. up from inverted and using a Perry VP-30 pump - stock muffler.
Fuel is Powermaster 15%nitro-20% Syn. Oil.
About 2 gallons of fuel max. run through it.
New OS F plug.
Cowl is shrouded to direct air over cylinder with at least 2x exit opening.
Tank is about 6in aft of carb.
For a prop I am using a APC 18-6W.
Question: I am getting is 8000 rpms tops. Does this sound right? Just seems like it is not developing full power. I did not document it but swear I was getting closer to 9000 rpms when engine was newer.
I have spent a lot of time adjusting mixture and cannot lean it out any further. Even had some of the top glow guys at the field go over my set up and tuning and found no problems.
Any suggestions on what I can try/look at to get more power?
Perhaps adjust the perry pump? If so, which way - more fuel or less?
Any help appreciated.