[Land-speed] Magnesium

[Doug Odom]

Tom, What brand are they? Are they Almag or Aluminum? I do know that I set 
up the Mag much tighter than the Aluminum ones. The Mag ones grow about 3 
times as much and need more preload.  Doug Odom in big ditch



> Hey, List,
> Does magnesium transfer heat differently than aluminum? The question 
> arises as a result of work I have done on six of the cars I have worked on 
> that run at the local short track. I have rebuilt  the Quick change rear 
> ends. Five of the rears are aluminum and one is magnesium. I have measured 
> the temps on each after racing as soon as the return to the pit area...as 
> soon as i can get to them. The temps are measured at the bell(on the side) 
> and at the rear cover where the spur gears are housed. I expect to see the 
> temps to be higher at the cover than the bells. The aluminum  rear ends 
> run anywhere from 206 to 225 at the bell and 225 to 244 at the cover. The 
> magnesium runs 270 at the bell and 290 at the cover. (Track temp last 
> night was 118). Is the mag rear end holding more heat than the aluminum?
> the lubricants vary from team to team with Mobil 75/90 the most popular, 
> Royal purple and Gibbs 75/110 ars also used. The mag rear uses Gibbs lube. 
> Went to it after last weeks temps were 10 degrees higher at the cover.
> Any one have an idea about  aluminum versus magnesium? Thanks in advance 
> for your thoughts.
> Tom
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