Hey pe, thanks for all your replies, im using mobil 1 fully synthetic the engine is running fine, but i get some b lack stuff at the exhaust, i heard some oils leave residue after burning and i was told about penzoil, i also saw klotz fully synthetic racing oil for gas engines, its on tower hobbies is that good oil?

many oils do that, especially in new engines. It should get less when the engine runs in

thanks again!

What prop should i put on a CMP Zero 1.20 ? it weighs about 5kg complete id say. Im using the standard pitts silencer from mvvs. I was to buy a mejlik and since they are expensive i dont wanna make a wrong choice. Could you please advise?

Does anyone have any numbers on rpm, since this engine is pre-2008 it has to run 8k rpm on the ground. Im interested in scale flight with good speed since its a warbird vertical is important but not so much to me. Thanks in advance.

16x12 for speed, 18x8 for all out pull. It will pull-out (3D) a 5000 grams plane on canister or pipe

Its neither a canister nor pipe, its the silencer that looks like a pitts. Will those prop sizes still work ?

Forgot to mention its the silencer for mvvs 1.60 number is 3270.

I have the prop rpm numbers with the 3270 muffler on my web pages www.mvvs.nl , and so does the MVVS factory www.mvvs.cz

The warning on your website about pre-2008 engines needing 8k rpm stationary, would 7500 - 7900 rpm be bad?

Not necessarily. The pre-2008 1.60 is at the design limits for conrod bearing load, so about 1 in 20 engines would be affected. Higher rpm reduces the connecting rod bearing load considerably. So does reducing the compression ratio by adding an extra shim under the head, which can be done without any power loss.

Could you please provide me a link to where i can purchase the shim i need.

Once again thank you very much for the help!

I have shims,
You can send mail from [link=http://mvvs.nl]My web page.[/link]

Thanks ill order them now!

Thank ever so much!