Discussion in '1982-Present GM Diesel' started by Seventy4Blazer, May 3, 2002.
can any of the factory turbos be addapted to a SBC?
I've heard its not a great idea to run diesel turbos on gas engines. You can't run the turbo down stream of the throttle with a diesel turbo. The compressor seal on a diesel turbo isn't designed to hold the oil back if there's vaccum on the compressor side so if you put the turbo after the throttle the vaccum will suck the oil out. If the turbo is upstream of the trottle it might work, I don't know. If the turbo has to push air through the throttle it might still put stress on the turbo that it wasn't designed for, since diesels don't have throttles.
I know the Swizcter(sp) line of turbos have a piston-ring type seal in the bearing cartridge, that cannot withstand any real vacume. I don't know of others turbos with this design limitation. BUT turbos are sized (compressor and turbine) for a particular engine/application. You can't just "bolt one on" and expect good results. Pick up a book on the subject that includes compressor/turbine maps to aid in turbo selection. Even if properly researched before hand the turbo may have to be "turned" by swapping the compressor housing (easy to do) to get the best performance.
A good book on desiging a turbo system is _Maximum Boost_ by Corky Bell. Amazon.com has it. Diesel Dan is right, the turbo has to be properly sized for your engine and what you want it to do.
I would personally go with a centrifugal supercharger before a turbo setup.
The maximum boost isn’t relevant first, the supplied amount of air is more important. A Diesel needs about five times so much air as a Gaser, therefore the turbochargers is much too large and heavy. The consequence would be a late load beginning (> 3000@) and immediate opening of the relief valve.
If you like to build a turbo engine less then 1890cui, it would be rather to use a smaller charger.
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