gearbox temp

[96terrano]

hi guys, i've got some digital temp gauges that i'm planing to fit into me truck at some stage, i was gonna use one for outside temp and one for gear temp, question is, do gearboxes get that hot? can thay over heat?:nenau

 

[solarman216]

hi guys, i've got some digital temp gauges that i'm planing to fit into me truck at some stage, i was gonna use one for outside temp and one for gear temp, question is, do gearboxes get that hot? can thay over heat?:nenau

Most unlikely, unless there is a problem inside, and by then it is already too late, Auto's excepted, Rick

 

[96terrano]

cheers, i won't bother with inserting a temp sensor

 

[glanrichbex]

Most unlikely, unless there is a problem inside, and by then it is already too late, Auto's excepted, Rick

Oh yes they do get hot .... but not to the extent where they need temperature monitoring. The losses is transferred to heat, put your hand on the gearbox case after a long run and you will be shocked.

All Wheel: Transfer case, two differentials, and a transmission. The transfer case and two differentials typically eat up about 5% of the power on their own, and the transmission eats up 10-20% power depending on if it's an auto or a manual. So total losses anywhere from 25-35%.

Rear Wheel drive, rear drive typically sees 15% loss for a manual, and 25% loss for an auto. Mid-engine, rear drive, transverse setup sees 12-22% losses like the FWD above. Mid-engine, rear drive, longitudinal setup sees 16-26% losses.

 

[solarman216]

Err the T2 in two wheel only has one dif, the rear axle one, the front is not on line and there is no third dif, Rick

 

[glanrichbex]

Err the T2 in two wheel only has one dif, the rear axle one, the front is not on line and there is no third dif, Rick

Just examples of losses in different combinations of transmissions :thumbs

 

[96terrano]

very interesting, i was working on mum's honda jazz yesterday , fitting a K&N which involved removing the air box and that gave me direct access to the gearbox. i was surprised at how warm it was i thought it was maybe heat off the engine untill i felt other parts of it. gears spining dont generate that much heat do they? well.......apart from the reduction gearbox in my electric drill........but thats buggered :lol:the honda's gearbox wasnt that hot, i could keep my hand on it no bother

 

[glanrichbex]

very interesting, i was working on mum's honda jazz yesterday , fitting a K&N which involved removing the air box and that gave me direct access to the gearbox. i was surprised at how warm it was i thought it was maybe heat off the engine untill i felt other parts of it. gears spining dont generate that much heat do they? well.......apart from the reduction gearbox in my electric drill........but thats buggered :lol:the honda's gearbox wasnt that hot, i could keep my hand on it no bother

Gearboxes do generate quite a bit of heat, why do you think there is 5Ltr of oil in it? - 1Ltr would be more than enough to lubricate the bearings and gears - on that basis you could make the gear case more compact to hold less oil.... only problem is you have a smaller heat sink and it would get hot.