300+ rebuild

[Freightrain]

1 hour ago, davehummell said:

Many years ago I worked at a trucking company that ran the 285's with the 5 speed in several cabovers to the coast and they sent a R model with a 237 with 5 speed on a weekly run to Canada. I knew a guy that I used to do work for that had a R model running to Texas and back

The difference is, the 237 and 285 were made for only 5 gears.  The 300+ isn't, so I bet it was slow to recover on a shift.

[cruiseliner64]

Im very interested in this build.please keep us up to date with it.A bit of a side question but how rare is a tip turbine nowadays?I have never seen one but Im interested in how they run.. ....

Paul

[Freightrain]

I was going to try to add one to my 237, but got a whole motor.  I hear they are quiet noisy at full song?  Guess I will find out.

 

Seeing they are 40+ yrs old, it is likely harder to find one?  Mine does work, as I had motor running and if I jabbed the throttle it would send a touch of wind into it and it would spin easily.

They were popular before CAC was mounted in front of radiator.

[Geoff Weeks]

2 hours ago, Freightrain said:

I was going to try to add one to my 237, but got a whole motor.  I hear they are quiet noisy at full song?  Guess I will find out.

 

Seeing they are 40+ yrs old, it is likely harder to find one?  Mine does work, as I had motor running and if I jabbed the throttle it would send a touch of wind into it and it would spin easily.

They were popular before CAC was mounted in front of radiator.

The tip turbine and Low Flow cooling were both attempts to better charge cooling without have to re design the front of the truck for enough room for an CAC cooling radiator (Air to air).

once trucks were being redesigned anyway, the reasons for the tip turbine and low flow systems went away. Having the charge cooler in front of the radiator give the best cooling, and what has become the std today. 

At the time, Mack tip turbine was revolutionary, both Cat and Cummins were still using water cooled aftercoolers, and low thermostat temps, to walk the fine line between good block temp and enough cooling for the charge air. 

 After Macks success, Cummins used the low flow system to run the "super cooled" multi-pass radiator coolant through the aftercooler, before sending it the engine. Cat never did and opted for the cooler in front of the radiator, which meant that their engines above 400 hp could not be fitted to many trucks. Cat engines below 400 hp still had the old water cooled aftercooler.