does anyone know if the precups are up to the task of staying hot the entire time? i know it was dicussed awhile ago that one of the main drawbacks of the idi design is the waste of heat. mainly through the cylinder head. i am not talking about the engine coolant system, but the way we make power. i though the idea, and what i think we are talking about now, is to extend or produce more heat by increasing the injection event longer/bigger i.e. more fuel. i was talking to another forum/member, and read some interesting SAE and DOT papers on these designs to change or modify the existing precups. what i take from it that in order for the idi design to effiecent the pre combustion chamber must remain as hot as possible during the entire combustion process to the next to auto ignite the fuel for the next go around. by increasing the fuel to keep this temperature up. who knows if the precups are up for the task? the other meber seemed to think, and with good evidence to, the current form of the precups loose to much heat energy through the cylinder head itself. meaning it disapates the heat to much, and this kind of heat is what we need. this what makes power in the idi diesel world.
options that were talked about, and what he said "i am working on" was a new design of precup that had a sheild or layer of insulating metal between the precup and the head to keep that baby glowing hot the entire time. this might prevent precups from going bad without being in contact with two way different temperature surfaces and cracking. obvisouly this research seem a little out there for me, and sounds way expensive for custom made precup from some body. (who?)
the idea is theasable though. just at diesel power's article on piston desgin quoteing that a flat top diesel piston design like in our idi were the most efficent. unlike the direct injected diesel of modern trucks, who have to keep a very large precup in the piston hot with what i like to call a "pilot light" to run. they waste more fule for the power they run. thanks but ill keep my 7.3 anyday of the week.
as far mounting two pumps, i think we need to look at a couple of engine that have the oil fill/ timing cover gear drive off. mount two pumps low right up close to the cam gear would be awsome and cheap to retro fit, but would mean a custom intake manifold, which wouldnt be that bad.
p.s.
i am not running anything from a chevy on my truck ever!
