Posted by Hal/Eastern WA on September 16, 2012 at 19:50:35 from (97.115.161.244):
In Reply to: Re: slant 6 diesel? posted by s.crum on September 16, 2012 at 05:20:58:
I messed around with slant 6"s for many years, both 170"s and 225"s. They held together well, got good gas mileage and were even fairly powerful for their displacement. But I never saw, or even read about a dieselized version.
The crankshaft might have been strong enough for diesel use, but the connecting rods would have needed to be lots stronger and obviously the pistons would have needed to be forged with a much higher compression ratio. I don"t know how much modification the head might have needed, but only 4 headbolts around each cylinder would certainly be a worry.
Over the years I had 2 head gaskets go bad on slant 6"s, one from a lower radiator hose popping and causing the engine to overheat. That caused the head to warp and need to be planed and get a valve job. That engine ran much stronger with higher compression! I never did figure out what caused the other head gasket to start leaking between 2 cylinders. The head seemed to be perfectly flat and I just replaced the gasket. It ran fine for a long time afterwards. But I would be concerned with the head gasket problem in a dieselized slant 6.
I still have a Duster with a 225 and have thought about the possibility of converting it to multiport fuel injection. I bet a lot of Jeep 4.0 parts could be used, including the computer. I have an aluminum intake manifold, which I think would be a whole lot easier to remachine for injectors than a cast iron one.
But would it be worth it to change over to MPFI? Probably not. I sure wish Chrysler had continued the Slant 6 into the MPFI era so there would be easily available parts. But they didn"t. It sure seemed to me that the 225 worked a lot better than the 3.9"s.
Yeah, a MPFI 225 is fun to think about, and so would a 170 screamer that would safely rev more than about 5500. Maybe someday!
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