turbo/supercharging

[Derrick Pero]

I was also throwing a turbo charging idea but was wondering...
To use a turbocharger I am under the impression that the compression ratio needs to be 
lowered to around 7:1. When not pressurized, or cruising, The CR would be exactly that. 
I thought an engine is more efficient at a higher CR? So that would make the engine 
inefficient just tooling down the highway?? Is it a tradeoff? Can you make a torbo work 
at 9 or 10:1 CR? 
-- 
Later...
Derrick


Todd King wrote:

>   Allright! Another guy about to realize the incredible benefits of forced
>   induction and join the Dark Side! May the force(d induction) be with you!
>   Think intercooled turbo; there are few drawbacks and it's truly (mucho!) power
>   on demand, then it's out of the way when you don't need it ie regular old
>   "vacuum" just like n.a. induction while putting around town, then the sky's
>   the limit (well, depending on octane and a few other things :-) for power when
>   you need it. The turbo offers the highest specific output potential of the
>   two; it's more efficient (and more flexible) than a mechanically driven
>   supercharger since it uses otherwise wasted exhaust gas energy. There are a
>   ton of old, misleading misconceptions about 'em, but take it from someone
>   who's been running turbos for nearly a decade now: once you get one, there's
>   no going back to n.a. when you want power! BTW there is always pressure (on an
>   absolute scale) in the intake manifold of every engine. We should toss the
>   notion of vacuum and just run absolute pressure gauges to ease some of the
>   confusion :-)
> 
>   Todd_King at ccm.co.intel.com

-- 
Later...
Derrick