V 4 vs V6 - same HP?
by Medtech - 5/28/05 10:45 AM
If 2 cars have same Horse power and one is V 6, the other is V 4.
Does it make any difference? What difference does it make?
by: Medtech May 28, 2005 10:45 AM PDT
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There is no such thing as a V4...
It is called an inline 4 cylinder because the cylinders are all arranged in a straight line. In a V6 the cylinders are arranged in a V with 3 cylinders on each side. There are many 4 cylinders our there that make more horsepower than V6s. Without getting to technical a V6 will usually be the larger engine with more liters because their are more cylinders, a 3.5 liter for example as compared to 2.0. Size is the first differnce.
Inline 4 cylinders typically make most of their horsepower in the upper rpm range. They are high-revving engines that have redlines in 7000rpm range or so. V6 engines make their horsepower at a slightly lower rpm. This all has to do with the size and design of the engine. Where the engines make their horsepower is the second difference.
Of course you have to look at the torque differences. Usually more liters translates to more torque. So V6 engines usually have more torque than inline 4s. Also V6s usually have more low end torque (lower rpms).
Ok lets say you 200HP Pontiac G6 and an Acura TSX
3.5L V6 (201 HP @ 5600 rpm, 220 lb-ft @ 3200 rpm)
2.4L I4 (200-hp @ 6800 rpm, 166 lbs-ft @ 4500 rpm)
The Acura makes its horsepower at 6800 rpm where the G6 is much lower at 5600 rpm. The G6 has more torque than the Acura available at a low 3200 rpm. All of the torque in the Acura is at 4500 rpm. So they both have the same horsepower but many differences. Of course there are other innovations that change these numbers such as variable-valve timing and exhaust, electronic-lift, double over head cams, number of valves, and so on.
Hope that helps.
no such thing as a V4?
you may want to check that statement....
http://encyclopedia.laborlawtalk.com/V4 amongst others, also the Saab engine
There are no V4s mass produced in an American automobile today.
Despite whether it's a V-4 or an I-4 (most of the time they make the 4 cylynders inline for space reasons), there are important differences between it and a v6.
CC for CC, a 6-cylynder engine has more combustion area, because of more cylynders, which would lead you to think that it'd have slightly more torque (power).
But that difference is slight. What you're going to find is that I4 engines have higher redlines, and you have to rev them much higher to get the power out of them.
V6's also tend to be smoother, as in they rev smoother, they provide power more smoothly, and they cause less vibration.
''V6's also tend to be smoother, as in they rev smoother, they provide power more smoothly, and they cause less vibration.''
I'm going to argue that statement. Typically inline engines are more smooth and refined in nature because they are simpler in design.
Its very interesting.
6 is smoother than 4 - I or V irrespective
Six combustions making one revolution of the engine is ALWAYS smoother than Four combustions making a revolution.
That wasn't an inline-versus-V comment, but a 6vs4 comment. I agree that a straight six would have less vibration because of the simpler nature of the configuration. However, if we're talking V6 (the most common today) versus I4, I know from experience that a v6 is smoother
Inline 4 cylinder engines are inherently rough due to a secondary imbalance from the connecting rods going side to side (front to back on a transverse engine) as the engine rotates. This becomes worse with larger displacement and is the reason 4 cylinder engines over 2 liters usually have counterbalancing shafts added to them.
Inline 6 cylinder engines have natural primary and secondary balance. It is hard to beat an inline 6 for smoothness.
V6 engines can be very smooth if they have 60 or 120 degrees between cylinder banks. They are usually also more compact and lighter than inline engines.
This is my first post to Car Tech. Discussions are very good and right on the money for answers.
Since you know straight 6's, why did Jeep decide to get rid of their old workhorse, the straight 6? It was smooth, powerful and a real workhorse. This goes back a few years ago when Jeep made the transition.
Thanks, and I will be posting again to ask a question.
I'm guessing it saves space to use a V6, and probably is easier to produce. Since almost all car and truck engines have now gone to Vs, I'm guessing it's just for ease.
Maybe more leg room in the front seats for taller people also.
A long time ago I was driving in Boston with my wife. Spotted Bill Russell, from the Boston Celtics. My wife waved to Bill, because she used to baby-sit for his kids while living in Reading, MA.
I saw Bill's knees near the side door window. He was really scrunched up trying to drive. Now, I think, it is easier for seven foot basketball players to drive their automobiles today.
Just my thoughts.
All things being equal, (HP, torque, displacement, pounds per horsepower) number of cylinders make no difference except for smoothness.
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