nexxa

My old OS.46 isn't screaming like before. After 2 years in my Viper500 with APC 9X7 with Ultratrust muffler. This engine is lying in a drawer now and the airplane in a garbage!. If I want to make it scream like before what I need to change?

Bearings and sleeve
Bearings, sleeve and piston
Bearings, sleeve, piston and connection rod

With time the engine lost some compression. When it's cold, it harder to start. It take maybe 30 secondes (need to wait until is hot) before it run and idle ok. Don't know the RPM, but I lost a maybe 2000 or 3000 rpm easely comparing 2 years ago.

Thanks

daven

My Feedback: (1)

Does it need bearings? Does the prop turn smoothly, or is it gritty?

It may only need a piston and sleeve, but at the cost of those replacement parts, you may want to consider a new engine.

Mike Connor

My Feedback: (5)

Sounds like it may be a peeled liner. Pull the head and look inside. A new TT Pro 46 is under $100 and will stay up with the 46FX.

rmenke

My Feedback: (13)

nexxa


If you decide to requild that 46FX, suggest you go to Performance Specialities (Nelson Racing guys, or was) for your high quality piston and abc linner. Will also give you a few rpm's. Not designed to be a cheater engine, just a quality replacement parts. Use their good bearilngs also. Cost is about the same or less than OS, much better quality. No more pealing linner either. Actually my TT's have been better than the OS, current design is stronger for sure in the head area. ENJOY

Flyboy Dave

My Feedback: (21)

....you can also use the Magnum .46 replacement parts which are much better than the OS parts.
The Magnum liner is true brass, with true chrome liner plating....good.

http://www.hobbypeople.net/gallery/281149.asp

FBD.

nexxa

Thanks.

Are you sure these parts will fit the 46FX, just before ordering it!? Thanks for reply.

I took a look of the engine inside. There is little rust on the rear bearings, but no loose at all.
The connecting rod look like new.

I will go with a new sleeve and piston and give a hot antifreeze bath to remove all this varnish on the engine head before putting everything together.

I know I can by a new TT.46 or Magnum for ±100$ but, i hate putting something to the garbage. And I like my little OS.46FX!

Flyboy Dave

My Feedback: (21)

....yes, the parts interchange....it has been done a few times....

http://www.rcuniverse.com/forum/m_69...tm.htm#6936314

http://www.rcuniverse.com/forum/m_66...tm.htm#6604087

http://www.rcuniverse.com/forum/m_58...tm.htm#5858864

FBD.