The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Bob_Roller on August 17, 2013, 08:07:06 AM
-
Got a non-contact infared thermometer this week, using it check my home air conditioning/heating system .
I checked the tire temps on the R65 this morning .
Air temp at 0500, 94 F (34 C), tire temps front and rear 101 F (38 C), road surface temp 106 F (41 C) .
After getting to work, 11 miles, 1.5 miles of surface streets, 9.5 miles of urban expressway, 70 mph .
Front tire 121 F (49 C), rear tire 130 F. (54 C), road surface temp at work, 102 F (39 C).
The ride home should get interesting, forcast temp for around 1500, is 113 F (45 C).
-
Did you check tire pressures at the elevated tire temps? Now that, too, would be interesting information.
-
I checked the tire pressure yesterday afternoon at around 1500, I move the bikes around, so the one I take to work on Saturday morning is next to the garage door and I don't have to do any moving early in the morning, the front and rear pressures were 37 psi .
I'll do a pressure check when I get home today .
-
It'll be interesting to see if the pressures follow the 10/10 rule or 10/20 rule or more likely something in between. If not the full 10/20 I would still expect you to have a bigger % rise on the rear.
I got 9.5/17.4
-
I checked the tire temps before I left work at 1430, both were 124 F (51 C) .
This is under covered parking at work, there is an 80 acre city parking lot covered in asphalt just to the east of the employee parking where I work, that probably explains the high temp, as the temp at Skyharbor airport where I work, was 111 F (44 C) at 1425, road surface temp 165 F (74 C).
Got home pulled the thermometer from under my mesh jacket and got 'ERROR' on the display, removed the batteries and reinstalled them a few minutes later, no help .
Checked the tire pressures, front and rear were at 44 psi .
I placed the thermometer in the freezer and 5 minutes later, it worked fine, so I know next time to put the thermometer in my packpack and maybe it will work when I get home !!!!!
Tires had 'cooled' down to 120 F (49 C), when I checked them .
I'll try this again, I'll take the tire pressures before I leave for work, then when I get there, same for the return trip home .
-
Good Lord, Bob! Riding around in the dark just outside the Gates of Hell...
Now I'm more concerned about you.
-
But it's a 'dry heat' , that makes it tolerable !!!!! ;D ;D ;D
A joke I just hear this week .
A priest was asked by his superiors, why he had so few converts in Phoenix .
The priests reply, ' after one winter here, heaven has no appeal, after spending one summer here, they have no fear of hell' . ::) ::) ::)
-
Aren't those infrared thermometers beaut. I got one last week and went straight for the engine. Now I can worry about why the right cylinder is hotter than the left (125/110). I'll do the tyres next time I'm out on the bike.
-
Difference in barrel temperature is manly due to a difference in the amount of gas coming in. Too lean a mixture and the cylinder runs hotter.
Often playing a bit with the idle mixture screw helps a lot...
Of course, I suppose the two spark plugs are the same and in the same state. And valve play is also equal on both cylinders...
-
Are these the Harbor Freight thermometers?
-
Why yes it is in my case .
I had a 20 % off coupon, thet were on special, so I got it for $15US .
Checked it with a calibrated infared thermometer at work and it was within a 2 degrees F of the calibrated thermometer .
-
Tried this again this morning .
Air temp at 0510 was 78 F. and 84% humidity, road surface temp 87 F, front and rear tire temp 90 F .
Front and rear tire pressures 35 psi .
Got to work, front tire temp 115 F, rear tire 121 F .
Tire pressures, front 36 psi, rear 38 psi .
A longer trip may have gotten the tires up to a higher temp and pressure, this was 11 miles .
-
Wow. Large differences in tire temps due to road and ambient air but not such a big swing in tire pressures.
Appreciate you taking the time to monitor and post your test results.
You da man, Bob. [smiley=dankk2.gif]
-
I may take a longer trip tomorrow morning, being a holiday weekend and getting out by 0500 traffic shouldn't be a problem .
Just looking at the pressure on the front tire while hot, the pressure may need to come down a bit .