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Old 11-19-2005, 09:28 PM   #1
DT04
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Quick quetion

I am sure this has been asked before, but i couldnt find a thread for it.

Can someone tell me the difference between v4, v6, and v8? Is it the more cylinders the faster and better acceleration, or does it depend on the size of the car. (I am confused because I see some cars with v4's and more hp than a v6) If someone could clarify that would be great, thanks.
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Old 11-19-2005, 09:30 PM   #2
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Old 11-19-2005, 09:31 PM   #3
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First of all its an I4, the difference between them is the number of pistons, cylinders and displacement mostly
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Old 11-19-2005, 09:32 PM   #4
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Ok, thanks.
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Old 11-19-2005, 11:05 PM   #5
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Technically, all that matters is displacment, not piston numbers, but in real life, the more pistons you have, the more power you can generate because;

1. A crankshaft can't take the torque coming from a 20 liter inline 4

2. If you have a V32 that has a bore of 90 millimeters and a stroke of 30 millimeters, each piston will produce around 10 ft-lbs of torque. That brings the total to 320 ft-lbs, and because of the small bore, you can rev the car to around 15-16 thousand RPMs, and make power up there. (provided you have parts that can withstand those revs). So, 15,000 RPMs, and 250 ft-lbs of torque, you get over 700 horsepower. If you have an inline 4 with a bore of 720mm, and stroke of 240mm, you'll get a VERY large amount of torque, but the RPM power-band will be very low (500-2500 RPMs).
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So, technically, with more pistons, you get more power, but you can't just judge a car's power based solely on that fact. You have to look at piston displacement, overall displacement, air ingestion, bore and stroke, aspiration, etc, etc.

Here's one major fact for you, NEVER use any one fact as a determining factor. No one number or fact means anyting on it's own.
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Old 11-20-2005, 01:22 AM   #6
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Quote:
Originally Posted by 99integra
First of all its an I4, the difference between them is the number of pistons, cylinders and displacement mostly

Not necessarilly, there have been V4's, we've been through this so many times, but I believe Volkswagen made it in a couple of their cars in the 60's...
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Old 11-20-2005, 02:34 AM   #7
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ok well im not to smart with under the hood either but i kinda understand it. You can have either a I4 or a V4, there have been V4's. But that means how many cylanders there are and well the more pistons you have pushing the crankshaft the quicker you can move off the line or so.
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Old 11-20-2005, 07:31 PM   #8
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Generally speaking, more cylinders=more power. This is not always the case though. Imports (specifically Asian) rarely use V8s. V8s are viewed as overweight gas gusslers to many Import buyers. So companies trying to appeal to the tuner/import crowd make 4 cylinder cars with 8 cylinder power. This is usually done by using turbos. A Suabru WRX STi makes about 320hp with a 4 cylinder engine. A new Mustang makes about the same hp, but it uses a V8. In most cases however, a 4 cylinder engine is used for good fuel economy, and isn't very fast. An 8 cylinder on the other hand is always used as a performance engine nowadays. If a car company makes the same car with 2 engines, the one with more cylinders is always faster. Example= a 2005 Mustang V6 is slower that a 2005 Mustang GT, which has a V8.
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Old 11-20-2005, 10:48 PM   #9
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Quote:
Originally Posted by DT04
I am sure this has been asked before, but i couldnt find a thread for it.

Can someone tell me the difference between v4, v6, and v8? Is it the more cylinders the faster and better acceleration, or does it depend on the size of the car. (I am confused because I see some cars with v4's and more hp than a v6) If someone could clarify that would be great, thanks.

You nearly answered you own query didn't you? As has been stated the number denotes the cylinder count. The rest is just subjective and no hard & fast rules apply.
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Old 11-21-2005, 07:13 PM   #10
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hm, actually, more cylinders does not necessarily mean more power. it just means more continous firing per revolution. more displacement is the one that should equal more power.

of course, a combination of both will most surely mean more power.
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