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General control line discussion => Open Forum => Topic started by: andy borgogna on May 20, 2016, 01:59:39 PM

Title: In need of some help with a K&B .40
Post by: andy borgogna on May 20, 2016, 01:59:39 PM

I inherited a K&B 40 R/C engine that I would like to convert to a control line engine, in short replace the carb with a venturi.  But, the engine is missing a prop thrust washer.  I have a friend with a lathe and maybe he can make the washer for me but if anybody out there in cyber space has one they don't need I could sure use it.  Any other help or info would be greatly appreciated.  After running the engine through the crock pot process it appears to be in good shape and I have a plane on the board that would a good fit.
Thanks in advance
Andy

Title: Re: In need of some help with a K&B .40
Post by: Terry Caron on May 20, 2016, 02:36:14 PM

Hi Andy - MECOA lists parts for the .40s here:
http://www.mecoa.com/kb/40/40-parts.htm
Good luck with it.

Terry

Title: Re: In need of some help with a K&B .40
Post by: andy borgogna on May 20, 2016, 02:43:04 PM

Thanks Terry I will give them a call.
Andhy

Title: Re: In need of some help with a K&B .40
Post by: andy borgogna on May 20, 2016, 02:57:26 PM

Just ordered the part, hope this works out.
Andy

Title: Re: In need of some help with a K&B .40
Post by: Terry Caron on May 20, 2016, 03:05:12 PM

If it's in good shape as you say, Andy, you shouldn't have any worries.
Let us know how it runs and post pix of your build!  ;D

Terry

Title: Re: In need of some help with a K&B .40
Post by: andy borgogna on May 20, 2016, 04:02:57 PM

Will do Terry.  Thanks again. ;D

Title: Re: In need of some help with a K&B .40
Post by: Dennis Toth on May 20, 2016, 04:18:36 PM

Andy,
The K&B 40 will work fine but you need to get the right venture around a 0.275 with ST NVA through the venture (Jim Lee or Randy Smith has them see vendor's corner). They like 10% nitro and 24% total oil (50/50 ok). Don't over prop it, a 10 1/2 to 10 3/4" x 5 prop works fine. Likes to run rich 2 cycle (almost a 4 cycle). Ship should be around 52 - 56" around 48 -50 oz ish. Mine works fine with a tongue muffler.

Best,    DennisT

Title: Re: In need of some help with a K&B .40
Post by: Motorman on May 21, 2016, 08:51:46 PM

Don't over tighten the set screws for the venturi. Put some blue loctite and just snug them or they will crack out.


MM

Title: Re: In need of some help with a K&B .40
Post by: Dan McEntee on May 21, 2016, 10:23:38 PM

   Do a search here for this engine and posts by the late Jim Thomerson. he used and liked the K&B .40 quite a bit and liked them. I think he propped his in the 11-4 range but not sure of that. I have one or two but have never ran them.
   Type at you later,
   Dan McEntee