why does 1995 8 cylinder buick roadmaster beat 2008 cadillac srx on gas mpg? - Chevy Impala Forums
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post #1 of (permalink) Old 05-06-2008
marwinstonboro
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why does 1995 8 cylinder buick roadmaster beat 2008 cadillac srx on gas mpg?

The caddilac is a six cylinder and the buick is a 350 v8 It doesnt make sense buick gets 26/17 while the cadillac gets22/15 horsepower is at 250 range im sure buick has more torqe. I dont know what cadallac weighs but buick weighs 4200! IS this how far weve come in 13 years? I knoew buick figure are corrct i own one sorry for spelling my backspace is out thaks
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post #2 of (permalink) Old 05-06-2008
 
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Part of the difference is that the Buick has a very simple and straight forward pushrod engine.

That new-fangled OHC 24valve Northstar in the Caddy is so dang complicated and it's really thirsty.
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post #3 of (permalink) Old 05-07-2008
 
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Fuel economy.

The EPA recently changed their fuel economy calculations to take into account "real world driving" rather than laboratory figures. Here is a link to the epa website for further reading.

http://www.epa.gov/fueleconomy/420f06009.htm

The northstar is a gem of engineering. The ohc 32valve drivetrain is brilliant, and much more efficient than a pushrod 16valve motor could ever fantasize about. Honestly, it's less complicated mechanically. MUCH fewer moving parts, and the layout of which makes a LOT more sense. The fuel/spark control is much more sophisticated (you could pronounce that complicated, but i like sophisticated) enabling the fuel delivery and timing to be MUCH more precise. Again, increasing economy.

Look for a How It Works in the near future (going to continue ground up with suspension next, i'll do engines after, and cover the northstar, since they are starting to put them in rear drive cars, and I believe even a buick, and someone might just feel like putting one in a b body, or derivative) about the difference. I'll go into the differences and how the advances in technology are better for the cars and industry in moderate detail, it'll make sense then hopefully.
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