Rust/Water proofing motor internals

General Discussion about electric bicycles.
Post Reply
Rifle
1 kW
1 kW
Posts: 362
Joined: Apr 15, 2009 9:13 pm
Location: Omaha, NE

Rust/Water proofing motor internals

Post by Rifle » Oct 23, 2012 7:11 pm

Trying to figure out the best way to deal with the fact that water can potentially get into hubs and rust things up as well known now through justin's video. I'm wondering why in the video they don't suggest a varnish applied to the internals (such as is done here: https://endless-sphere.com/forums/vi ... it=varnish) as well as vent holes for drying? I want to open mine up and see if any of my rainy riding has gotten into it (I feel like it hasn't since the connections have silicon tape and drip loops and I don't store it out side in the rain) but since that will then break water-proofing seals I feel like I should do the vent holes / varnish after doing so.
2807 9c front hub. 48v 20ah Ping. 12s2p Lipo.

User avatar
Kingfish
10 GW
10 GW
Posts: 4275
Joined: Feb 03, 2010 11:23 am
Location: Redmond, WA-USA, Earth, Sol, Orion–Cygnus Arm, Milky Way. Age: > yesterday < tomorrow
Contact:

Re: Rust/Water proofing motor internals

Post by Kingfish » Oct 24, 2012 10:49 am

Also RUST: DIY Hub Motor Repair & Restoration.

It would cost less than a $1 USD to varnish a motor correctly in production. And drilling two small holes into the periphery - one on each side of the hub covers for weeping seems like a no-brainer. I haven't a clue why they don't do this other than just to cut corners. It drives me batty. It took so much work to repair mine - I wouldn't ever try it again EXCEPT that there are no viable alternatives for where I live - which is in an urban rain forest.

Perhaps one day someone could come up with a method where you drill two holes, inject a lightweight medium that acts as a conformal coat, go for a quick ride to ensure that the stuff has entered every crack and cavity, then drain it out and let'r dry. Done. The enterprising guy that can come up with that process... perhaps a service that provides a Dr. R&R FeelGood experience for say $50 (bearing & wire upgrades extra), could make a tidy sum in the wet counties. Just order a new motor and route it through the Upgrade factor before sending it to me please. I'll take two. 8)

~KF
* My 2WD Garden Wall
* Kinaye MotorSports
* Primary ride: 2WD Disc 9C 2806-equiv / Dual Lyen 12FET / 20S7P LiPo.
* Epics: Going to California: 2011 8)
* 50-mph, 101, 10k-Club. 12,527 miles-to-date, 7037 as 2WD.

It is by caffeine alone I set my mind in motion.
It is by the beans of Java that thoughts acquire speed.
The hands acquire shakes, the shakes become a warning.
It is by caffeine alone I set my mind in motion.

mat h physics
100 W
100 W
Posts: 156
Joined: Dec 07, 2010 12:49 pm
Location: Ral, NC

Re: Rust/Water proofing motor internals

Post by mat h physics » Oct 24, 2012 11:25 am

Have you considered tooling blue (aka gun blue) for the steel laminates? Aluminum will produce an oxidized layer naturally, but may benefit from a sacrificial anode.
IMO, varnish has an inherent "thickness" which will crack under thermal cycles. Many water repellants, including PTFE, are avb, but applying some can be quit a task.
Specialized Hardrock, still conventional.
Schwinn Avenue, still conventional.

itchynackers
100 kW
100 kW
Posts: 1211
Joined: Dec 27, 2009 11:11 am
Location: Janesville, WI

Re: Rust/Water proofing motor internals

Post by itchynackers » Oct 24, 2012 2:21 pm

I just tore down my Pikes Peak motor (which was coated with high-temp vht enamel). Nothing wrong with it, just "improving" it for next season. Anyway, the only change I saw was that the enamel came off the magnets. Everything else looked pristine the way I left it. I suspect it was my prep job. I wasn't sure I could roughen the magnet surface to paint, so I just cleaned and left it. However, there isn't any visible rust/corrosion/damage of anykind (I was running ATF fluid).
9c 9x7f w/ 12awg phases
9c 8x8r w/ 10awg phases, temp sensor, vented
9c 6x10r w/ 10awg phases, temp sensor, liquid cooled, 3rd Place Pikes Peak 2012!

"Don't argue with the galactically stupid...they drag you down to their level and beat you with experience"

LI-ghtcycle
1.21 GW
1.21 GW
Posts: 3872
Joined: Aug 29, 2009 11:39 pm
Location: Oregon City Oregon

Re: Rust/Water proofing motor internals

Post by LI-ghtcycle » Oct 24, 2012 4:24 pm

Anything that is going to last has to be a form of a controlled oxidant such as bluing agents used with firearms, or parkerizing (sadly parkerization only works on ferrous metals, perhaps anodizing will work for the aluminum parts?) but sure, some nice varnish would be better than not, I bet there is a form of marine coating/treatment that would be ideal. :idea:
Thank you Justin_Le for your selfless act of kindness! We all are in your debt.
Back on track E-Bronco! Now with Cro Motor Mid-Drive Goodness!
https://endless-sphere.com/forums/viewt ... 28&t=44997

Vision R40 w/3000w MXUS as mid-drive, NuVinci N171B rear wheel as transmission, Silent yet powerful, running 72v 11.6 ah (20s 18650 Li-Ion) to climb hills, tow trailer with zero pedaling when needed!

https://endless-sphere.com/forums/viewt ... 28&t=75247[/size]

Post Reply