os max 40 fp
12-27-2005, 07:55 PM
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os max 40 fp
Hello
I need advice , I just purchased a plane with a os max 40fp that has been sitting for years, after freeing things up and converting to a remote needle i can get the engine to run but it seems to be throwing a massive amount of oil out the muffler using a 10 % nitro fuel from sig A little advice concerning howw to adjust screws on carb would be useful too manual is difficult too undestand in these areas
should needle be adusted at wide open throttle or less??? engine tends to start backwards some also but from what ive read this not unusal , it feel to have good compression. any thing you can tell me would be helpful this is my first gas engine been electric so far i hope to use this mottor in a spad which is a bit heavy for electric system
Thanks
Doug
I need advice , I just purchased a plane with a os max 40fp that has been sitting for years, after freeing things up and converting to a remote needle i can get the engine to run but it seems to be throwing a massive amount of oil out the muffler using a 10 % nitro fuel from sig A little advice concerning howw to adjust screws on carb would be useful too manual is difficult too undestand in these areas
should needle be adusted at wide open throttle or less??? engine tends to start backwards some also but from what ive read this not unusal , it feel to have good compression. any thing you can tell me would be helpful this is my first gas engine been electric so far i hope to use this mottor in a spad which is a bit heavy for electric system
Thanks
Doug
12-28-2005, 10:26 AM
#2
My Feedback: (11)
RE: os max 40 fp
Oil from the exhaust is normal. Your model will become noticeably coated with it. That's because about 18% of your fuel is oil that doesn't burn.
You adjust the high-speed needle with the engine running at full throttle. Lean the engine to peak and then back off a bit so that the engine is not running lean of peak when you point the model straight up at full throttle with about 1/4 tank.
The air-bleed screw works to adjust the idle mixture. Turning it counter-clockwise leans the idle. You start out with it blocking 1/2 of the air-bleed hole.
A good book to get would be Harry Higley's "All About Engines". It can be ordered from your favorite hobby retailer and gives a wealth of detail.
You adjust the high-speed needle with the engine running at full throttle. Lean the engine to peak and then back off a bit so that the engine is not running lean of peak when you point the model straight up at full throttle with about 1/4 tank.
The air-bleed screw works to adjust the idle mixture. Turning it counter-clockwise leans the idle. You start out with it blocking 1/2 of the air-bleed hole.
A good book to get would be Harry Higley's "All About Engines". It can be ordered from your favorite hobby retailer and gives a wealth of detail.
