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Old 03-14-2004, 01:32 PM   #1
ENiGmA
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difference between a 4cylinder and a 6cylinder?

just curious
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Old 03-14-2004, 01:37 PM   #2
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what diffrences do you want to know about? your question leaves such a broad spectrum of answers it is nearly impossible to answer your question. P.S. i'm not really flaming you, but rather need more information to be able to help!!
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Old 03-14-2004, 05:35 PM   #3
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how much more clueless can you be?

4 cylinder engines have 4 cylinders

6 cylinder engines have...now stay with me here..6 cylinders!

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Old 03-14-2004, 06:42 PM   #4
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dude its as simple as 6 cylinder engines have more cylinders than 4 cylinder engines to "create" more power - more fuel/air gets combusted, goto howstuffworks.com or something for beginners
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Old 03-14-2004, 07:05 PM   #5
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Basically, 6cylinders use to be bigger than 4 cylinders -obvious- and bigger engines give you more torque at low rpm.

But if you are reffering to engines with the same capacity (for example 3.0 L 4cyl. and 3.0 L 6cyl.) 6 cylinders use to be smoother than 4 cylineders.

On the other hand, we can do another comparison. Hyundai's 2.7 L V6 170 hp vs. VW's 1.8 L turbo 150 hp. Both engines have similar performances, but Hyundai's V6 runs smooth roaring like a kitty meanwhile VW's 1.8 turbo screams like an eagle when running at 7000 rpm. In this case, a 4 cylinder turbo is more radical than a 6 cylinder.
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Old 03-14-2004, 11:54 PM   #6
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well it also all depends on the quality of parts used. also, the more pistons you have, generally the more lb/ft of torque it produces. usually. for it's not uncommon for say a v-6 to produce more bhp than a v-8, but the v-8 probably generates more torque.

it's all complicated and whatever. one more thing, the more cylinders an engine has, the smoother it usually is. especially during acceleration. with more pistons it's easier to tune out the engine vibration as much as possible.
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Old 03-16-2004, 12:25 PM   #7
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While all of the above is very true, remember that the number of pistons has no direct correlation to the size of the engine. the characteristics of an engine are engineered into it in the design stage in most modern cars, so passenger cars will be required to have smooth, quiet and efficient engines whilst "sports" cars will be required to have more responsive and powerful engines with little concern towards noise levels. Manufactures chose an engine out of their parts bin (so they do not have to design an entirely new engine) and then change the ECU, which in turn changes the mapping of the engine. They also change cams or add and remove turbos etc to vary the engines between vehicles. This method works out cheaper and quicker.
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Old 03-17-2004, 12:53 AM   #8
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Can we just end this now before any more mis-information gets handed out? What everyone is says has a certain level of truth of course, but I think this is WAY over the original poster's head now. Let's just leave it at, we need MORE specific info as to what he/she is looking for. SURELY we cannot be dealing with someone so clueless as to not know the difference from a numbers standpoint. Regarding the 3.0L 4cyl and 3.0L 6cyc we would all know that it is the same VOLUMETRIC displacement, rather, the geometry changes proportionally, ie) bore and stroke. Six cyl's have two more pistons and each one will be smaller than the four cylinder's pistons but the total summation of volumetric displacement is the same. It's got not a thing in the world to do with block size. When talking liters and such, we care about displacement.


Quote:
Originally Posted by R34RB30DETTV
While all of the above is very true, remember that the number of pistons has no direct correlation to the size of the engine. the characteristics of an engine are engineered into it in the design stage in most modern cars, so passenger cars will be required to have smooth, quiet and efficient engines whilst "sports" cars will be required to have more responsive and powerful engines with little concern towards noise levels. Manufactures chose an engine out of their parts bin (so they do not have to design an entirely new engine) and then change the ECU, which in turn changes the mapping of the engine. They also change cams or add and remove turbos etc to vary the engines between vehicles. This method works out cheaper and quicker.
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Old 03-17-2004, 04:53 AM   #9
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But in some cases a 4 cyl(cylinder means piston therefore a 4cylinder has 4 pistons, unless you're dealing with a rotor engine but we wont go there) can produce more power than a 6cyl (6 piston). For Example, The wrx STi produces ~270hp (turbocharged), and thats a 4cyl, the 300zx produces 222HP (naturally aspirated [non turbo]), and thats a 6cyl. I'd rather have a turbocharged 4 cyl because they're light, and I like to drive SlideWayS,
Thats my .
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Old 03-17-2004, 04:56 AM   #10
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Quote:
Originally Posted by enron fever
well it also all depends on the quality of parts used. also, the more pistons you have, generally the more lb/ft of torque it produces. usually. for it's not uncommon for say a v-6 to produce more bhp than a v-8, but the v-8 probably generates more torque.

Not quite. it's not the number of cylinders, but rather the combusted volume pushing against the piston that produces the torque. Lets say you have a 6 cylinder and an 8 that are the same displacement, lets go with 300 cubes (personal preference ). Everything else being equal, the 8 will be smoother and most likely will produce more horsepower as it has more constant power pulses. The 6 cylinder will run rougher (unless it's an inline) but will put out more torque. This is because in the 6 everytime it fires it has a greater volume per cylinder to combust, so more force pushes on the piston to turn the crank. It has fewer pulses, but the ones it does do more work.

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Old 03-17-2004, 12:46 PM   #11
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Quote:
Originally Posted by Hoxviii
Not quite. it's not the number of cylinders, but rather the combusted volume pushing against the piston that produces the torque. Lets say you have a 6 cylinder and an 8 that are the same displacement, lets go with 300 cubes (personal preference ). Everything else being equal, the 8 will be smoother and most likely will produce more horsepower as it has more constant power pulses. The 6 cylinder will run rougher (unless it's an inline) but will put out more torque. This is because in the 6 everytime it fires it has a greater volume per cylinder to combust, so more force pushes on the piston to turn the crank. It has fewer pulses, but the ones it does do more work.

Justin
true, also the stroke and the bore proportions come into it but like cmeseadoin says, lets leave it at this..
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Old 03-17-2004, 02:41 PM   #12
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Quote:
Originally Posted by jzxTT
But in some cases a 4 cyl(cylinder means piston therefore a 4cylinder has 4 pistons, unless you're dealing with a rotor engine but we wont go there) can produce more power than a 6cyl (6 piston). For Example, The wrx STi produces ~270hp (turbocharged), and thats a 4cyl, the 300zx produces 222HP (naturally aspirated [non turbo]), and thats a 6cyl. I'd rather have a turbocharged 4 cyl because they're light, and I like to drive SlideWayS,
Thats my .

just to be a little anal the WRX STi engine has 300 hp. not 270.

http://autos.yahoo.com/newcars/d/sub..._overview.html
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Old 03-17-2004, 03:14 PM   #13
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Thank you superjew, I was JUST getting ready to correct him on that. If you're gonna give stats, give the right ones. STI=300hp / Lancer= 271hp.

[quote=SuperJew]just to be a little anal the WRX STi engine has 300 hp. not 270.
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Old 03-17-2004, 03:25 PM   #14
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Quote:
Originally Posted by JaBoFordRid3r
dude its as simple as 6 cylinder engines have more cylinders than 4 cylinder engines to "create" more power

If only you hadn't said that then maybe replies like jzxTT's could have been prevented

Quote:
Originally Posted by jzxTT
But in some cases a 4 cyl(cylinder means piston therefore a 4cylinder has 4 pistons, unless you're dealing with a rotor engine but we wont go there) can produce more power than a 6cyl (6 piston). For Example, The wrx STi produces ~270hp (turbocharged), and thats a 4cyl, the 300zx produces 222HP (naturally aspirated [non turbo]), and thats a 6cyl. I'd rather have a turbocharged 4 cyl because they're light, and I like to drive SlideWayS

Bringing turbos and drifting into this discussion is beside the point

I thought it would be interesting to sit back and read the replies to ENiGmA's question but I think it's time for me to post now

ENiGmA, cylinders tend to have 2-5 valves each. More valves help to produce more power because of the engine being able to 'breath' better. You already know about air and fuel being mixed because Car Guy told
you: -
More air + more fuel = more power.

More cylinders = more valves = more air.

The cylinders make up the size of the engine. If a 2.0-litre engine has 4 cylinders then each cylinder = .5 of a litre.
The cylinders in an engine don't want to be too big or too small.

There you have it - 2 factors that are linked to how many cylinders an engine has are size and the quantity of valves. Smoothness has already been mentioned and the sound they produce also comes into the equation.

Is that understandable and informative enough for you?
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Old 03-17-2004, 05:35 PM   #15
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just a question... if all V6's are faster then 4cylinders than why do all the kids these days want the 4cylinder imports tht are supposedly "faster" than all the V6's.... i'd race my imaginary GT 500 against one of those wussies anyday...
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