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Juicy (oily) idea for turbo enthusiasts
Posted 04 November 2003 - 08:32 PM
Diesels like turbos. A lot. So they all have them (now, mostly).
What do diesels have that many turbo cars don't have? And pretty much no non-turbo cars?
Piston cooling. High efficiency turbo diesels have a jet of oil squirted onto the inside (back) of the piston to draw heat from the piston crown. If this added cooling wasn't there, the piston would get so hot, it could melt, score the liner, fry the rings, etc. Actually saw this in person with a Mack engine that had an improperly installed "piss tube". Or oil squirter thingie, whichever professional term you prefer.
So how do you squirt oil onto the back of a subie piston? Squirter tubes probably wouldn't work, cuz there isn't enough room for them.
So, my idea (which isn't new, but seemingly unmentioned on the USMB so far) is to rifle-drill the connecting rods. Keep in mind, drilled rods aren't uncommon, because many engines with floating wrist pins have this feature to lube the wrist pin.
Instead of that, picture this (exactly like a Detroit Diesel 2-stroke): the wrist pin bushing is removed from the small end of the con rod. The rod is put on a mill, and a groove is cut in the center of the bore in the rod. Now a hole is drilled into the very top of the rod. The bushing is replaced, and now an oil passage exists all the way through the rod, around the wrist pin bushing, and out the top, to the backside of the piston. A hole will be needed in the upper connecting rod bearing shell, of course. I guess if you wanted your wrist pins pressure lubed, a hole could be drilled through that, too.
This would be an excellent excuse to buy a high volume oil pump and an oil cooler, because both would probably be needed.
What are YOUR thoughts?
Posted 04 November 2003 - 09:01 PM
Posted 04 November 2003 - 09:08 PM
I like a good excuse to confound my machinist.
Posted 05 November 2003 - 07:51 PM
What could be used as a nozzle for an EA series engine?
Posted 05 November 2003 - 09:41 PM
Posted 05 November 2003 - 09:50 PM
Just some ideas to throw around.
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