Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!

Log in

I forgot my password


Display results as :

Rechercher Advanced Search

Latest topics
» Laying off building planes for a while.
by batjac Today at 2:35 am

» WTB driven gear(s)
by Jason_WI Yesterday at 11:28 pm

» Hey BOB, there's a market for your Enya's
by GallopingGhostler Yesterday at 10:44 pm

» Cox P-40 Parts
by crankbndr Yesterday at 7:05 pm

» 5 Sure Start Engine Radial
by getback Yesterday at 10:04 am

» Cox .01 /.02 /.05 Engines & Mods / Nano Speed Planes
by 1/2A Nut Fri Oct 19, 2018 9:32 pm

» High Performance Cox tools by Bob Oge
by roddie Fri Oct 19, 2018 9:08 pm

» Recent engine acquisitions
by KariFS Fri Oct 19, 2018 4:37 pm

» Shuriken cylinder with piston for sale
by ukanduit Fri Oct 19, 2018 3:07 pm

» Sterling 36-inch RTF CL P-51 Mustang w/Cox .15 Sportsman
by Ken Cook Fri Oct 19, 2018 2:42 pm

Cox Engine of The Month

"Prototype T.D. .010 c.1960"

Speed Contest 2018
CEF Traveling Engine

Win This Engine!
The Traveling Prop

World of Aviation

Basic maintenens and performance

Go down

Basic maintenens and performance

Post  Pin head on Wed Apr 16, 2014 1:12 pm

I just wanted to know if i could use olive oil as a after run oil.

Why can't we use synthetic oil in our cox engines.

What is a good size plane for a cox 049killer bee.

Can I use olive oil instead of castor in fuel.

Thanks in advance
Pin head

Back to top Go down

Re: Basic maintenens and performance

Post  RknRusty on Wed Apr 16, 2014 3:54 pm

I'll answer with what I've learned from modelers who have a much better background in engineering and lubrication than I do. As I understand it, castor oil has a lot of properties that no other oils have. Those are the same reasons why 2-stroke motorcycle racers use it in their engines. Aside from being a good lubricant, it has a high smoke point, higher than even many synthetics. Rather than burning off in combustion, it mostly passes through and exits the exhaust carrying heat with it, thereby regulating the engine's temperature. Without it the engine would not have the ability to radiate heat fast enough to prevent destroying itself. The portion of castor that does reach a critical temperature, rather than burning off, turns to a varnish that deposits a protective layer that prevents wear of load bearing surfaces.

One of these in particular in the Cox engines is the ball socket that connects the connecting rod with the piston. It must have a varnish coating to lessen friction and prevent it from eating itself in short order. This is the main weak point of Cox engines. The ball socket still needs to be tightened with a reset tool after breaking in, and sometimes after an engine has been run in a high performance manner. The varnish also prevents premature wear of the piston and cylinder. Olive or other vegetable oils would not be up to the job.

Modern synthetics make a good addition if mixed 50/50 with castor. They reduce excessive varnishing and have even better lubrication properties. The best after run oils are air tool oil with additives that neutralize the leftover combustion compounds that would otherwise oxidize and corrode the engine's internals.

Any 1/2A control line. kits with wing areas in the 100-200 square inch range are good for a Killer Bee. That's probably one of the best Cox reed valve engines ever. RC and Free Flight planes can have much larger wing areas if they are light and floaty.
Here are some examples of C/L models:

There's more. I'll get back to it later if someone doesn't continue. Welcome to CEF

Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!

My Hot Rock & Blues Playlist

Posts : 10630
Join date : 2011-08-10
Age : 62
Location : South Carolina, USA

View user profile

Back to top Go down

Re: Basic maintenens and performance

Post  PIN HEAD on Wed Apr 16, 2014 4:54 pm

Thanks for the info - really appreciate it.


Back to top Go down

Re: Basic maintenens and performance

Post  Sponsored content

Sponsored content

Back to top Go down

Back to top

- Similar topics

Permissions in this forum:
You cannot reply to topics in this forum