Motor Design Question
Motor Design Question
Okay, I was just wondering why have most car companies shifted form straight 4 or 6 cylinders to the V configurations of now. Is it just to have a shorter hood? Or is there a more beneficial reason?
for toyota and nissan, from what i heard, the change from i6 to v6 was because of stricter emission requirements (in japan?)
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Ease of meeting safety/crash standards is a major reason, increased crush space and ease of packaging with V6 config.
Also for front wheel drive a shorter V6 works better for transverse mounting.
Also for front wheel drive a shorter V6 works better for transverse mounting.
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so car 4 bangers are all in line.
as for why the move to v6's, i suspect the main reason is the engine is physically smaller, or at least a shape with more flexible packaging options. with i6 the engine is long and can pretty much only be done longitudinally.
once again, it's another packaging issue. a flat engine configuration is very wide and exhaust manifold runs closer to the ground, which often interferes with steering (track gets too wide). porsche has the engine hanging behind the rear axle and its butt relatively slanted compared to the nose, so a boxer engine would be an ideal package for the chassis.
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Joined: Aug 2001
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From: Houston, Republic of Texas
While the I-6 is the only configuration with natural balance, staggered cranks, balance shafts, and experiments with angles between the cylinder banks have eliminated much of the "buzziness" of the old straight fours and the "shaker" V8s.
Packaging is the problem today, and squeezing a moderate-displacement engine into an engine room that has to be shared an automatic transmission, torque converter, engine accessories (and often the electric motors that drive them), restricts the engine configuration to only a few options. Note the I-5, late of the Chevy Colorado and Volvo. While both engines were short on development, their vibration level was deemed unacceptable by the buying public. Too many compromises had to be made in the engine bay to squeeze in an extra cylinder. A balance-shafted V-6 is a better solution.
Packaging is the problem today, and squeezing a moderate-displacement engine into an engine room that has to be shared an automatic transmission, torque converter, engine accessories (and often the electric motors that drive them), restricts the engine configuration to only a few options. Note the I-5, late of the Chevy Colorado and Volvo. While both engines were short on development, their vibration level was deemed unacceptable by the buying public. Too many compromises had to be made in the engine bay to squeeze in an extra cylinder. A balance-shafted V-6 is a better solution.
Lexus Fanatic
Joined: Oct 2003
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From: Virginia/D.C. suburbs
so car 4 bangers are all in line.
as for why the move to v6's, i suspect the main reason is the engine is physically smaller, or at least a shape with more flexible packaging options. with i6 the engine is long and can pretty much only be done longitudinally.
