Quote:
Originally Posted by jamesqf
Sure - but I bet those transmissions weighed about as much as the whole Insight does :-) And were mostly iron & steel. Aluminium has 4-5 times the thermal conductivity.
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It's the only vehicle I've ever operated that had a transmission temperature gauge.
Yeah, it's about like comparing grapes to watermelons.
No matter.
Itty-bitty car vs
20 ton 6x6 truck with Allison MT553 5sp AT (and DT466 in-line 6 diesel )
- Greater thermal conductivity >> greater heat dissipation during warm up
>> longer warm up for oil in itty-bitty car transmission.
- Itty-bitty transmission mass vs MT553's mass (900lbs-1100lbs ?????)
>> shorter warm up for oil in itty-bitty trany.
- Less work moving 1,500-3,500lb curb weight vs ~40,000lbs curb weight >> a whole lot less friction
>> longer warm up for oil in itty-bitty trany.
- Tiny or non-existent transmission cooler vs large transmission cooler
>> shorter warm up for oil in itty-bitty trany.