Me wrote:

"wintertime heating" ?????? Come on give us all a break. Why in the
world would a Design Engineer spec an Low Vlotage Electric Heating Unit
for a Bus, when they are throughing away, Orders of Magnitude, more
energy out the cooling system, of the engine that is powering the Bus?
This is beyond Stupid, and very near Moooorrrroooooonic.........

They wouldn't; however, pumps and fans add up.

SFWIW, there are at least a couple of manufacturers who provide stand
alone oil fired heating systems for trucks and buses.

You can take your meds and go back to sleep now.

Lew

The origional question was about the alternator running too hot and
questioning the service life.

That thread was 3 months ago! You must be a very slow typist!


On an "alternator" search it showed up. I added to it.

alot of people read these threads because they want info.


so I added to it. I suppose we can go all the way back to threads in
1997 or earlier if you wish.

In article . net,
Lew Hodgett wrote:

They wouldn't; however, pumps and fans add up.

SFWIW, there are at least a couple of manufacturers who provide stand
alone oil fired heating systems for trucks and buses.

You can take your meds and go back to sleep now.

Lew

and why would the design engineer spec an electric pump for the job of
moving cooling fluid around when there is this really BIG engine with
a pile of HP sitting right there, that already has a nice pump on the
front? Just how many low voltage fans does it take to spread the engine
heat around a bus, and just how many AMPS do they draw? Not anywhere
near 200 AMPS.....like MAYBE 20 AMPS if they really had a LOT of fans,
amd wanted to COOK the passengers.

Me maybe you should cut down on your meds, and get a CLUE....

and why would the design engineer spec an electric pump for the job of
moving cooling fluid around when there is this really BIG engine with
a pile of HP sitting right there, that already has a nice pump on the
front? Just how many low voltage fans does it take to spread the engine

heat around a bus, and just how many AMPS do they draw? Not anywhere
near 200 AMPS.....like MAYBE 20 AMPS if they really had a LOT of fans,
amd wanted to COOK the passengers.

Me maybe you should cut down on your meds, and get a CLUE....



Plenty of clue when you realize that a bus isn't a Chevy Corsica.

most Silver Eagle bus's have at least 4, 5 HP dc motors that push
cabin air to all points of the bus. these draw about 25a. a piece. Not
much math to do there.

also the engine does produce the heating water. but there are also at
least 2 booster pumps to aid circulation to the heater coils these pull
about 10-12 a. each.

Then comes all the courtesy lights (over 100 at about .5 a. ea.) which
individually don't draw much, but there is strength in numbers. not
counting the drive, tail lights etc

Air conditioning? i don't know how much the electric cluth on the
compressor can draw but I think it's about 20-25a, as well.

a typical bus used a Delco 50-dn 12v-280 a. alternator (engine oil
cooled) for these reasons.
and they put out about as much at idle as they do WFO.

a typical bus used a Delco 50-dn 12v-280 a. alternator (engine oil
cooled) for these reasons.
and they put out about as much at idle as they do WFO.
OOPS!

Delco-DN 24v-280 A.

a typical bus used a Delco 50-dn 12v-280 a. alternator (engine oil
cooled) for these reasons.
and they put out about as much at idle as they do WFO.
OOPS!

Delco-50DN 24v-280 A.