I'm not currently interested in attempting to twincharge a vehicle, but i've always been curious of the workings of it.

My question is regarding the blower compressing the boost from the turbo.

Would twincharging work w/ a roots or only a twin screw?

Let's say that the turbo is pushing 1.5 bar into the inlet of the supercharger: 1.What would the intake pressure be w/ a roots blower that pushes 1.5 bar when atmospheric pressure is supplied to the inlet?
2. What about the same for a twin screw?

Would a centrifugal supercharger be completely pointless in this application?

*I am only asking theoretically assuming that there would be no temperature increase or heatsoak and regardless of what engine it is applied to*

 

I would think the Roots (Radix) would be the one to go with just for its low end punch, then your turbos will kick in your mid-top ed punch...

Either way, you gots bigger ballz then me for even wanting to try this kind of setup... Props to ya...

 

That is pretty interesting, I think you could take advantage of a really huge blower having the turbo to feed it.

 

There are some system's that use a smaller turbo spooling a larger turbo.
Also the sequential twin turbo's that use a small turbo for low rpm and a larger turbo for the higher RPM's.I plan to twin turbo my truck and want to do the sequential setup maybe.A turbo spooling a roots i have not heard of,though i have seen twin roots setups and also (8) turbo setup before.
Sounds interesting though I don't see a turbo spooling a roots,maybe a root's or centrifugal spooling a very large turbo.That would eliminate the low end power loss because there would be no lag,but in the end the cost would be the same as a larger roots compressor.The coolness factor would be the only reason i would do it.You would still have the parasitic loss of the roots on the crank.

 

Old school diesel truck engines use to have a turbo fed blower setup, I am not to sure about the specs. If it was done before i'm sure there is a way to get it to work on a gas engine.

 

Two-stroke Detroit diesels came with and without turbochargers. They don't use the piston and crankcase to bring air into the engine like your two-stroke dirt bike does. They all have roots blowers on the side of the engine, forcing air through the transfer ports into the sides of the cylinders. The crankcases are pressure oiled like four strokes. They have a second set of rings at the bottom of the piston to seal the crankcase. The ones with only blowers are considered naturally aspirated, only when a turbocharger is added to the intake side of the blower are they considered (turbo)supercharged. This, by the way, is the engine that the first nuts that put roots blowers on gasoline engines, confiscated the blowers from.

 

Yeah, ive heard of the 2stroke twincharged detroit diesels. Those things are insane. I do realize that there would be parasitic loss from the blower still, but im asking this in a purely theoretical situation only regarding the boost that would be created by twincharging. On the cool factor, def. yes. My dream would be and ls7 w/ an mp122h side mounted on each side being fed by two separate turbos but dreams and reality are completely different things.

 

Check this out . That should get some of you interested on figuring this idea out. That car is insane. Watch the videos.

 

http://video.yahoo.com/video/play?p=...h%26ei%3DUTF-8

 

just ask VW, they are doing it production...sorry no million dollars for your idea today.....