1968 Mci Bus Motor Home

[luvrbus]

New engines still have a option of a after cooler they are not married to the charge air coolers, where you are confused the CAC is a inter cooler meaning the air is cooled before the turbo and with a after cooler the air is cooled after the turbo    

[TomC]

Virtually all new Diesels have air to air aftercoolers. They are positioned to be the first cool air before the radiator. I have air to air intercooling (between the turbo and blower) on my 8V-71. My set up was the first Don Fairchild installed on a bus. He liked it so much, he's done several other buses that way. When pulling a long hill, it keeps the intake much cooler then the rather small coolant aftercooler on Detroit TA engines. Good Luck,, TomC

[bevans6]

Thanks Brian, I had no idea that was the setup. The large trucks I see at work have massive air-to-air radiators to aftercool the intake air, and I had a Volvo 850t that used air also. That incoming air must be very hot if they are willing to use 190 degree coolant to cool it.

The temperature of the charge air is quite directly related to the amount of boost.  If you are running 30 psi above ambient maximum boost the intake charge air will be around 350 degrees F, from memory.  I think the aftercooler can pull that down to around 220 degrees, again from memory (and I have no idea where I am remembering those numbers from).  So quite a useful drop in temperature.

Brian

[5B Steve]

  I talked to the owner of that bus about 10 years ago and they were asking around $ 64,000 at that time. It was in Jasper, Indiana

  Steve 5B......