larry30000 wrote:
Took her out for a 40 mile spin today lots of breaking in city traffic, temps were between 150f-170f degrees on all of the wheels & hubs. What would be an acceptable temp. range?
Larry, getting back to you. I had the TT out this weekend. I do not know exactly where you took your temps. Meaning location on the wheel. Are they drum or bearing temps? Part of this is are they all the same in the same spot on all 4 wheels within reason. A lot of heavy braking will heat the whole thing up with drum OD being hotter but the magnet dragging can heat the side too.
To get a truer bearing temp you need more rolling with less braking. Also what did you use to measure with? What type of probe?
I find my bearing areas to be in the ~ 110 area when just cruising down the highway and not a lot of braking. But this will go up to ~ 130 after a lot of stops.
These temps are as I have measured them with my casting thickness etc. If you probe in a different area or have different castings by a great extent you will have different numbers and hotter ones if closer to the OD of the drum.
As a guide from somewhat normal machine temps. here are some temps as a general guide. These are more from machines I use at work, not your wheel drums. I do not have exact numbers from a host of wheel bearings but these may give you a guide. Others may jump in here and help give a wider range on wheel temps and where they took them at.
120F is cool. 150 is getting warm. Bearings at 170 are very warm. Bearings at 220 are getting hot and bearings at 300 had better have the right grease and expansion clearance or they are in serious trouble. You should be using high temp wheel bearing grease but it too will melt at real high temps. of 350 to 400F
They do make real high temp bearings/grease for special applications to run at 300 degrees all day long, but I'm sure you do not have them...
To help, I took my temps this weekend. I also found I had one brake shoe to tight in relation to the others and it was braking first. I adjusted it at the campground and retook temps on the way home. So helping you, helped me. I also edited the first page of this post in
BLUE with my measurements and where I took them
Hope this helps
John
