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Metal temperature and torque values

DeadEye

GT Reference
GT di Razza Pura
Joined
Jun 13, 2020
Messages
1,480
Location
Eastern Ontario - Western Quebec
One of those questions just popped into my head...
You take the bike out to warm it up, before the oil change, you go a little further that planned and the oil comes out like water.
When closing everything up, I start thinking , everything is hot and has expanded, what ever I tightened now, when they cool will they be loser, loosen ?, perhaps be under the recommended values ??

This could/would apply to anything tightened when hot...
This would be why your told to check the valve clearances cold !
 

Raven

High Miler
GT Famiglia
Joined
Jul 3, 2017
Messages
938
Location
Lac Ste. Marie, Qc
If the fastener and what it is bolted into are the same metal, there should be little difference in torque value. If they are dissimilar metals there could be a small difference.
 

Michael Moore

Tuned and Synch'ed
GT Contributor
Joined
Nov 21, 2016
Messages
26
Location
San Francisco, CA
Matweb has a coefficient of temperature expansion for A356 (a common good quality aluminum casting alloy) of
11.9 µin/in-°F @Temperature 68.0 - 212 °F. For 4340 steel (high strength alloy) it shows 6.83 µin/in-°F @Temperature 68.0 °F. So if the things you are measuring include both ferrous and aluminum materials, you may see different clearances between the items at different temperatures. Using the numbers above can give you an idea of how much the expansion rates differ with changes in temperature.

cheers,
Michael
 

DeadEye

GT Reference
GT di Razza Pura
Joined
Jun 13, 2020
Messages
1,480
Location
Eastern Ontario - Western Quebec
I am guessing that most motorcycle crank cases are made of aluminium, and the drain plug bolts are some type of steel, there being less expansion in the steel, there would be a diffference after it cooled from 90c to 20c But not as much as the Aluminium.
I was initially concerned , being unsure about whether they would be getting tighter or looser.
So maybe they would be a bit looser, but not measurably so.
( at least not by me with my craftsman torque wrench)

Thanks for the input.
 
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