50 dn generator

lostagain · June 13, 2018, 08:37:50 PM

The new Prevost buses I drive have 3 alternators. Belt driven. They have gone to 8 electric fans on the radiator and the charge air cooler. The fans only come on one at a time going up a hill on a hot day. The alternators only produce on demand. Modern technology...

JC

TomC · June 15, 2018, 07:28:14 AM

Electric fans on radiators are fine when the sizing of the radiator is made for the reduced air flow with the electric fans. Electric fans work great on transit buses since they are stop and go. Trying to retrofit electric on our buses just don't work. Good Luck, TomC

luvrbus · June 15, 2018, 07:42:36 AM

The 8 work on a Prevost when all 8 are on you need a safety belt those will suck you in when you walk by, lol old Two Dogs of the past on the Bus Nut board would be proud of the electric fans on the Prevost

buswarrior · June 15, 2018, 07:46:15 AM

Yup, a package deal.

Radiator and fan air flow have to be partners.

Did anyone find 2-dogs, the debate raged years ago...

Happy coaching!
Buswarrior

luvrbus · June 15, 2018, 07:59:20 AM

Prevost had a few hiccups at first but all is well now they work with the same radiator as the mechanical drive saving 50 hp.Boomer taught us this 15 years ago on his Eagle that everyone said would not work lol it is still working with a electric fan

chessie4905 · June 15, 2018, 02:07:43 PM

The Prevost I saw didnt have a two cycle engine. There isn't enough space in front of radiators for the number of fans it would take.

MagnoliaBus · June 16, 2018, 06:50:11 PM

I will soon remove my grear driven 50DN and replace it with a belt driven/air cooled Delstar alternator of the same frame size.(http://www.delstar-hd.com/results.asp?q=8600191)
This alternator run cooler than the oil cooled 50DN even in a hot engine comparment (we have tested it on a couple of transit buses where i work).
It also has higher Amps output at low engine rpm.
Another good thing about belt driven alternator is the ease of access to inspect cable and terminal.

buswarrior · June 17, 2018, 04:41:33 AM

For the air cooled folks, check out an MCI J model.

There is a duct from the curb side engine room access door to the alternator, to feed it cooler outside air.

Heat kills alternators, and those of us who are charging big battery banks while jumping between boondocking sites, are making a lot of heat.

The hotter engine rooms are also just on the cusp of being in the hands of busnuts. Average engine room temps have risen dramatically between before and after various EPA thesholds, and some manufacturers didn't get some years sorted out as best as they could have. Know Whatcha got!

Happy coaching!
Buswarrior