Tim the Tool Man Taylor

"PartyPooper2012" (PartyPooper2012) 03/08/2017 at 09:46 • Filed to: None

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MORE POWER... <>

I need more info on engines

Lets take 3 common engines - 4 cyl. 6 cyl and 8 cyl. For this discussion, let’s say 2 liter, 3 liter and 4 liter respectively. No turbos. no superchargers. All 3 will allegedly make a car go. Let’s put all 3 engines in same size and weight car.

What should we expect to see performance wise? Will 4 cyl be slowest? and 8 cyl be fastest? because cylinder count?

Will 6 cyl be faster than 4 and 8 because weight of 8 make car much heavier? and 4 cyl engine won’t have enough oomph?

itschrome > PartyPooper2012 03/08/2017 at 09:50

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too many variables..

Pixel > PartyPooper2012 03/08/2017 at 09:59

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If we keep everything hyper-simple the 8 will be fastest.

The 8 cyl car will have twice the power of the 4cyl car, but only twice the engine weight (not twice the car weight).

Same vs the 6cyl. IT has 1/3 more HP, but only 1/3 more engine weight.

Jcarr > PartyPooper2012 03/08/2017 at 10:08

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Relevant:

PartyPooper2012 > Pixel 03/08/2017 at 10:08

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Is doubling displacement equal to doubling power?

If I had a 8 cylinder with 8 liter engine - would that be 4x power?

Pixel > PartyPooper2012 03/08/2017 at 10:26

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in the real world? No. Way, way, way to many variables, starting with most 4cyl engines are inline and most 8cyl are V8.

But in general, barring forced induction, more cylinders = more HP. And the added weight of the larger engine is not enough to negate the added HP.

PartyPooper2012 > Pixel 03/08/2017 at 10:40

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is it the cylinders that add horsepower, or the liters?

Pixel > PartyPooper2012 03/08/2017 at 10:45

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Again, No. Way, way, way to many variables. 

The Stig's former college room mate > PartyPooper2012 03/08/2017 at 15:34

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You can make this a little easier by comparing engines that are based on other engines. Examples: a chevy 4.3 V6 is basically a 5.7 V8 with two cylinders cut off. Compare two identical 1993 C1500 trucks, one with 4.3 and one with 5.7, and the V8 is faster. Or a Dakota 3.9 v6 vs 5.2 V8. or a Ford Taurus 3.0 Duratec v6 vs an Aston Martin vantage 6.0 V12 (both cars are actually within 100lbs of each other)

Other than that, you have way too many variables to compare.

PartyPooper2012 > The Stig's former college room mate 03/08/2017 at 15:42

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I am trying to figure out obsession of displacement and cylinder number. I can get a nice 2 liter engine with 4 cylinders and it will go not far behind a 6 cyl or 8 cyl cars.