8v92 Superchargers

Being gear driven off the crankshaft, it’s the blower / supercharger that starves the engine of air the most at low rpm’s. That’s when the turbo shines on a 2 stroke.

To much boost…..? Do you fully understand the dual purpose of the air box drains on a 2 stroke? Just asking…..

 

No I don’t know much about them.

 

I think that the only turboed 2 stroke that I have run was a trip with a truck that had a 6V92. Pretty impressive really! All the rest was 671s, 453s, and 8V71s.

And Jim I admit that I do not fully understand the dual purpose of the air box drains. Could you explain please?

 

Good morning Oxbow my friend, hope all is good in your neck of the woods.

The 6V-92TA Silver in the 1981 International with the Ingersoll Rand TH-55 drilling Rig was rated at 350 horsepower. Pretty good for a small cube V6.

The 8V-92T in my 1980 GMC General is only rated at 365 horsepower, but is capable of more.

The 8V-92TA in the International Transtar I had was 435 horsepower.

The air box drains actually perform a dual purpose. They provide a means of draining the air box of any engine oil, but they also give the engine a way to “blow off” any excess air pressure.
If you ever get around a Detroit running just stick your hand under the drain and feel the air blowing out. It’s like a pressure relief or a bypass around the thermostat in a cooling system.

Not much with words lol, hope that makes sense…..

 

Basically a waste gate? Is it open all the time or is it pressure regulated?

 

That does, thanks. I was aware of the oil drain, but not the excess air part.

 

The drains are open all the time, just a steel line screwed into the side of the block. If oil builds up in the air box…. someone’s gonna have a very interesting time as it turns into a cast iron shower….

 

Little things dad taught me years ago, still wish I had 50% of his knowledge….

 

I still don’t see where a turbo can do much good at low rpm. To get any boost at all at low rpm it would have to have such a small turbine wheel that it would create major blockage and even with the air box drains turbo overspending seems like an issue. Forgive me if my two stroke ignorance is showing.

only way you learn is by asking. I do realize blowers don’t really come in until higher rpm’s, but I also know that can be manipulated by the size of the drive gear. Much like changing impeller wheels.

 

From running a lot of non turboed Detroits in comparison with my brief time running a turboed engine I can tell you that there is a dramatic improvement in low rpm performance with the turbo.

As to why, I best leave that to others.