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nitpicking Posted by JimBlake [Email] (#141) [Profile/Gallery] (more from JimBlake) on Wed, 15 May 2002 08:19:38 In Reply to: Turbo's dont blow..., AP, Tue, 14 May 2002 18:51:01 Members do not see ads below this line. - Help Keep This Site Online - Signup |
You got the basics right, but I'm gonna nitpick.
Reroute the exhaust??
Yes it does. Rather than straight out to the catalyst, it routes it to the turbine first. This extracts energy from the exhaust, but imposes extra back-pressure which means the engine has to work harder to "push" the exhaust out thru the turbine. As you know, the overall result is more power. No, the exhaust doesn't get put back into the engine. Thats EGR, if your car has that.
"Compressor turbine"??
Which is it, compressor or turbine?? A turbine extracts energy from expanding gas, and a compressor compresses gas. In a "turbocharger" they are connected to the same shaft. Just a nitpicky detail of semantics.
Theoretical displacement??
Naturally aspirated & boosted engines' displacement is geometric. Piston area x stroke. Nobody corrects "theoretical displacement" based on a restrictive intake system providing some vacuum even at wide-open throttle. Thats volumetric efficiency or pumping losses.
The FIA rules don't really apply to non-racing engines, BMW must have just used that for naming the car. I don't believe they listed 4.5 liters displacement on the specification sheet.
posted by 131.184.14...
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