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Post  Paulgibeault Thu Oct 18, 2018 6:26 pm

Gentlemen,

Perhaps there are a few of you who might be interested in what one fellow (Bob Oge) does to obtain high performance in his Cox .049 motors.
Here is a most unorthodox way of breaking in the motor without the use of a test stand! Photos taken at the Dallas Fall speed/Race content last weekend.  

High Performance Cox tools by Bob Oge  20181021


-Here's Bobs tool for holding his (newly chromed) Cox cylinder while lapping in a new piston.High Performance Cox tools by Bob Oge  20181022
High Performance Cox tools by Bob Oge  20181023
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High Performance Cox tools by Bob Oge  Empty Bob Oge Piston Holder Lapping Tool

Post  Paulgibeault Thu Oct 18, 2018 6:30 pm

Here's Bob's custom piston holding fixture tool.

High Performance Cox tools by Bob Oge  20181027
High Performance Cox tools by Bob Oge  20181026
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High Performance Cox tools by Bob Oge  Empty Bob Oge's piston lapping tool

Post  Paulgibeault Thu Oct 18, 2018 6:35 pm

Here's Bob's adjustable piston "truing" tool that laps the piston completely square. It's made from a piece of steel which everyone told him would not work.
Well dang!  It does work & works well!



High Performance Cox tools by Bob Oge  20181029
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High Performance Cox tools by Bob Oge  Empty Bob Oge's chromed crankshafts.

Post  Paulgibeault Thu Oct 18, 2018 6:39 pm

Here are Bob Oge's chromed crankshafts. Bob sands the stock crankshaft down a bit then chromes it back to size.
When done right, they fit real free in the c/case.



High Performance Cox tools by Bob Oge  20181030
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High Performance Cox tools by Bob Oge  Empty Notes from Bob Oge on piston fit

Post  Paulgibeault Thu Oct 18, 2018 6:48 pm

Bob claims that his method of determining if a piston is worn is by turning the motor to top dead center & looking for bubbles coming off the piston.
If bubbles are evident, the piston is worn.  However, Bob feels that if the piston sticks much below TDC, then it will not be a "fast" one...
INTERESTING!
By applying a thin layer of chrome to a (bead blasted) clean cylinder bore, Bob can resurrect most any cylinder and that
gives the rebuilt motor a much longer service life. Bob shut down his chroming service & no longer offers it to modelers unfortunately.  Sad
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Post  Jason_WI Thu Oct 18, 2018 7:00 pm

That's pretty neat. How many RPMs did these mods increase in the engine performance?
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Post  Paulgibeault Thu Oct 18, 2018 7:12 pm

Jason_WI wrote:That's pretty neat. How many RPMs did these mods increase in the engine performance?

You know, I'm not sure if they add all that much extra RPM to a perfectly set up standard engine. HOWEVER, they sure do add to the RELIABILITY & LONGEVITY of the engine.
If you can control piston to cylinder fit, you have a much better chance of going consistently fast also.

Truly, the proof of the pudding is really in the flying. Sadly due to the horrendous rainfall, mouse race had to be cut from the events roster & so we really don't know... Sad


High Performance Cox tools by Bob Oge  20181032


Last edited by Paulgibeault on Fri Oct 19, 2018 12:32 am; edited 1 time in total
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Post  Cribbs74 Thu Oct 18, 2018 7:33 pm

I would also be interested in performance figures, although longevity is probably much more important as long as the engine is competitive. Sorry you got rained out.
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Post  1/2A Nut Thu Oct 18, 2018 7:44 pm

Thank you for sharing Paul Thumbs Up that was interesting.

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Post  balogh Fri Oct 19, 2018 12:30 am

Paulgibeault wrote:Here's Bob's adjustable piston "truing" tool that laps the piston completely square. It's made from a piece of steel which everyone told him would not work.
Well dang!  It does work & works well!



High Performance Cox tools by Bob Oge  20181029
High Performance Cox tools by Bob Oge  20181028

Very interesting tools. Thanks for posting.

I wonder if I understand its function correctly: to e.g. reinstate piston roundness after a balljoint resetting went wrong and resulted in a trumpet in the piston crown? (What else would impact roundness other than a wrong resetting?)
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Post  Paulgibeault Fri Oct 19, 2018 12:37 am

balogh wrote:
Paulgibeault wrote:Here's Bob's adjustable piston "truing" tool that laps the piston completely square. It's made from a piece of steel which everyone told him would not work.
High Performance Cox tools by Bob Oge  20181029
High Performance Cox tools by Bob Oge  20181028

Very interesting tools. Thanks for posting. I wonder if I understand its function correctly: to e.g. reinstate piston roundness after a balljoint resetting went wrong and resulted in a trumpet in the piston crown? (What else would impact roundness other than a wrong resetting?)

YES, I believe that is correct. Some (softer) pistons get out of round easily. Others seem to hold shape better.
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Post  getback Fri Oct 19, 2018 8:12 am

Cool Stuff Paul , Thanks for sharing this . I am sure having constant runs are as important as beeing the fastest . Babe Bee .049
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Post  fredvon4 Fri Oct 19, 2018 3:10 pm

Red paint drops or Blood in the piston photos?
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Post  Ken Cook Fri Oct 19, 2018 4:16 pm

Bob did 3 LA.25's for Phil Cartier, they just run like no other LA .25's that I have seen. I have a piston liner from Bob for my Fox .15 BB. I haven't run it yet.
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Post  Paulgibeault Fri Oct 19, 2018 7:54 pm

Thankfully....stray paint!

fredvon4 wrote:Red paint drops or Blood in the piston photos?
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Post  roddie Fri Oct 19, 2018 9:08 pm

Thanks MUCH for this info Paul!!
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