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Sedans Entry Level Luxury Performance Sedans
11073 messages, Last post on Jul 16, 2009 at 1:47 PM
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Replying to: plekto (Apr 14, 2008 1:52 pm) That adds weight as well. And worsens efficiency. So as a result, you can make a smaller I-6 than a V6 and get the same results. So often, you can fit the I-6 in the car as well as a V6. Forgive me for being pedantic but why would a V6 need more connecting rods than an I6 ? Also, don't forget that you make make a shorter, (in length and lose a little height), engine in V6 than of the same bore I6.............can see some benefits there. Of course Flat 6's are even better, albeit rather rare. Subaru and Porsche being the only ones that come to mind in current production. No particular preference for V or I - just like 6's in general and 5 cylinder diesels in particular, (yes, I know, it's my age  ).
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Replying to: alltorque (Apr 16, 2008 10:24 am) It doesn't. Six cylinders are six cylinders. He was just spitting out parts trying feverishly to prove an I6 is better than a V6 without even considering what those parts are or what they do. 
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Replying to: tayl0rd (Apr 17, 2008 4:54 am) My first car was a 1956 Vauxhall Velox - sort of U.K. take on an early-50's Chevy something; all rounded and nice. That had a 2262cc I6 that pumped out a mind-blowing 59bhp, (but a fair bit of torque), and was coupled to a 3M 'box. First was so low that you could use it for pulling up tree stumps. Even that amount of power could embarass the cross-ply tyres of the day. All black body, lots of chrome and a carnation pink & white interior, (2 x 3 seat benches), plus valve radio. You could definitely see the GM influence. Happy days. 
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Replying to: alltorque (Apr 16, 2008 10:24 am)
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Replying to: louiswei (Apr 17, 2008 7:26 am) |
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Replying to: tayl0rd (Apr 17, 2008 4:54 am) *** from wiki on 60 degree engines*** However, more modern designs often use a 3-throw crankshaft with what are termed flying arms between the crankpins, which not only give the required 120° separation but also can be used for balancing purposes. Combined with a pair of heavy counterweights on the crankshaft ends, these can eliminate all but a modest secondary imbalance which can easily be damped out by the engine mounts *** So you don't have piston. rod. crankshaft. like in an inline engine. You have a bunch of intermediary parts kludged together to keep it from shaking itself apart. GM's 90 degree designs are even more complex and run even rougher, being designed off of V8 engines. Actually quite nasty, really. They tend to eat through engine mounts fairly regularly. The reason you don't see many I6s is because they usually won't fit in a FWD car due to there needing to be space for the CV joints and transmission as well. Thankfully it is making a comeback as makers are slowly realizing what a giant turd FWD technology is, especially in vehicles with over 200HP.
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Replying to: alltorque (Apr 17, 2008 6:18 am) I also remember tube (valve) radios in cars -- they took awhile to warm up and really could run down the battery if left on while the engine (with its generator) was shut down. Lots of things have improved tremendously in automobiles over the past 50 years, but many of them add weight. My '65 MGB was lots of fun to drive & own, with the knock-offs, wire wheels, the tightest steering I've ever had and shifter feel that was unequalled. Safe? Not really. Powerful? No. Radio quality? Awful. Still, a wonderful car. |
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Replying to: plekto (Apr 17, 2008 3:44 pm) Actually, when looked at from a part count perspective, V6 crank shaft, crank bearing, and connecting rod assemblies (bearings included) are actually simpler than an I6. Why is that? Simple, your typical V6 only uses four main bearings with a single 2-cylinder offset throw in between each main pair, however, your typical I6 uses seven main bearings with each cylinder having its own throw situated between main pairs. In spite of this difference, I6 engines usually have a considerably lower parts count compared to a V6 of an otherwise similar design. Best Regards, Shipo
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Replying to: shipo (Apr 17, 2008 8:13 pm)  Sorry, still having flashbacks...  
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