why no blowers in daily drivers?

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Originally Posted by Ol' Ron

I do think this is possible and one of the tests I'll be preforming id just that. The Eaton blower is available at a very reasonable price they were available on Buick's since 1992 until the mid 2000 on their 3.9L engines. Unfortunately there isn't an intake available for them. These blowers work on a demand principle where the engine run under atmospheric pressures until Manifold vacuum drops below a predetermined value and you get max boost. This allow the driver a stock engine performance until he needs more power. I've built such a setup for testing and will pass along the results. These are also available from Magnason, They use a different blower , but operate on the same principal. Pics to follow.

Old Ron. The operating principle you describe is how the supercharger is setup on my engine (photo attached) in a daily driven car. Under normal street operation the engine runs naturally aspirated on the carb's primaries. As engine vacuum decreases the valve bleeding off the supercharger's boost closes at which time the 6#'s of boost is sent to the engine. The trick is maintaining engine RPM to stay on the torque curve without getting into it and making boost. (For some reason my 73 year old brain and legs don't communicate like they used to.) As you know CR, Cam design and Boost all play a role in making a supercharged engine street friendly. Another equally important element in balancing performance and fuel economy is getting the power to the ground. In setting up my car as a driver I used an automatic transmission with O/D and 3.73 gears. In retrospect I think any supercharged engine that produces good low and mid range torque coupled to an O/D trans a better compromise might be 3.54 gears. Just food for thought when you get around to the actual build.