JBrady
Active Member
- Messages
- 1,776
- Location
- Houston Texas
I have been an advocate of turbocharging for over 20 years. I tried to bring screw type supercharging to the offshore powerboat race community in 1991. I understand the relative inefficiency of "roots" style supercharging verses "true" comressors.
That said I am excited by the new Eaton TVS superchargers. IF... and that is a big if... Eatons claims of adiabatic efficiency in the mid 70s (up to 76%) is true this is a breakthrough developement.
http://www.eaton.com/EatonCom/Produ...Products/Products/Superchargers/TVS/index.htm
Adiabatic refers to temperature rise, how much the temperature increases for any given amount of boost created. The less heat the better the efficiency and the less likely the engine will detonate.
Both screw type superchargers and roots type superchargers are positive displacement devices. This simply means that for each rotation of the charger a specific volume is moved. Since a piston engine is also a positive displacement device the two (supercharger and engine) can be combined to create a fairly flat boost curve.
This also means that boost is available almost immediately at any RPM. This gives the engine the same "feel" as a bigger engine. From the standpoint of a street driven car this is usually considered the best and most fun way to get that wonderful low speed response and power.
With the production capacity and numbers that Eaton runs this all means low cost high efficiency superchargers.
That said I am excited by the new Eaton TVS superchargers. IF... and that is a big if... Eatons claims of adiabatic efficiency in the mid 70s (up to 76%) is true this is a breakthrough developement.
http://www.eaton.com/EatonCom/Produ...Products/Products/Superchargers/TVS/index.htm
Adiabatic refers to temperature rise, how much the temperature increases for any given amount of boost created. The less heat the better the efficiency and the less likely the engine will detonate.
Both screw type superchargers and roots type superchargers are positive displacement devices. This simply means that for each rotation of the charger a specific volume is moved. Since a piston engine is also a positive displacement device the two (supercharger and engine) can be combined to create a fairly flat boost curve.
This also means that boost is available almost immediately at any RPM. This gives the engine the same "feel" as a bigger engine. From the standpoint of a street driven car this is usually considered the best and most fun way to get that wonderful low speed response and power.
With the production capacity and numbers that Eaton runs this all means low cost high efficiency superchargers.
