Thread: Saabs supercharged SVO engine (2001) gets 30% BETTER MPG than naturally aspirated engine.

Edited on Tue Sep-15-09 05:46 PM by JohnWxy With higher octane fuel (E85 = 113 octane) You can use higher compression and get more power per cu in. MOre power means more "work". and work is what were interested in. YOu can downsize a supercharged or turbocharged engine and get better mileage than a similar powered naturally aspirated engine of larger size. http://ateupwithmotor.com/terms-and-definitions/technol... " a...

Premium made with ethanol should cost less than regular not more.

Wikipedia says, at the moment: "The SVC project was shelved by General Motors, when it took over Saab Automobile, due to cost." A moving cylinder head could be quite an engineering problem. It'd be interesting to know what difference they thought it'd make to manufacturing cost, and reliability.

Alcohols have less energy then gasoline and diesel. High performance vehicles, those with high compression or supercharged need higher octane to prevent preignition. The higher octane of E85 will allow the turbocharged engine to run it OK but to get the same performance MPG goes down. There ain't no free lunch!

Edited on Mon Sep-14-09 07:39 PM by Turbineguy (or for that matter superchargers) push more air into an engine, permitting more fuel to be burned. Burning more fuel generates the greater horsepower. Naturally aspirated 4 stroke engines benefit from charging by an increase in volumetric efficiency. This results obviously in more power for a given sized engine. This translates to a smaller engine for a given size power requirement. Turbos are...