Believe me, I'm far from a car mechanic...actually I'm not even mechanically inclined. But doesn't it stand to reason that if you stroked a motor from 2.0 to 2.2 Ltrs. that you would see an increase in horsepower. There is a slight increase in the amount of torque from the new engine. Hopefully one on the members who buys a new 2004 S2k will run it on a dyno. Your thoughts?

Also, I wonder if the new 2.2 engine has any "new" upgraded parts as compared to the 2.0?

 

In general increasing stroke (length) will result in increased torque. To add horsepower in general you will need to increase bore (diameter).

 

Also note that HP is related to RPM.

 

There are three components to engine performance.

Torque
RPM
Horsepower.

It is not necessary to increase HP to make your car go faster. You can attack the problem by concentrating on the other components. Specifically, Honda went the rpm route.

In a nutshell, Honda's secret is to employ modest HP and torque numbers, but to employ them at extreme rpms. Honda can't match some of it's high HP competitors, but nobody, and I mean nobody can match Honda's power output at the extreme rpm range.

Honda went the F1 route when they designed the S2000. If you look at HP numbers in F1 over the past 20 years or so, they have remained relatively constant. The big breakthrough has been in rpms which enables engineers to take advantage of light weight and gearing.

The S2000 is essentially a miniature version of F1 technology, philosophy, and research in an affordable sports car.

Enjoy the car for what it is and it's heritage, don't get to worked up about HP figures..............Honda F1 engineers don't.

 

hp = torque * rpm.
Honda increased the engine displacement by increasing stroke. Torque increased as a result (as it would if they had increased the bore). Normally, this will result in an increase in peak hp. But the S2000 engine is pushing the limits of engine rpm for a production commercial auto. The increased stroke apparently necessitated a compensating reduction in max rpm (redline). End result was a wash in peak hp. But you will get more hp at any given rpm it can reach.

 

[QUOTE]Originally posted by FCGuy
hp = torque * rpm.
Honda increased the engine displacement by increasing stroke.

 

Not exactly... Work causes a vehicle to "continue" to accelerate. It is the torque at any given moment that causes the acceleration. Its the continued application of torque over time that constitutes work.

 

No mechanic here but there is a slight increase in HP from what I last remembered.

Overall, I believe the car will perform the same because with the larger wheels there will be added weight and the engine has a lower rev. Thus I think an old s2k vs a new s2k will be more or less even.

 

Torque is what makes you car move from a stop light, torque is what makes your car accelerate, and torque is what you feel in the seat of your pants when you hit vtec.

HP and rpm are the components which create torque(or twisting action of an object) the byproduct of HP and rpms.

Hp is defined as the work effort of the average horse to pick up an object(around 500lbs I believe) within a specified time period(one second,I believe)

 

Agreed, torque is what moves that car and it's what you feel in your butt, but the way you're talking about HP as a component to engine performance (and torque as a byproduct) sounds funny to me -- don't you start with a torque output at a certain RPM and go from there?

Also, I believe it's the change in torque that is what you feel when you hit VTEC, called "jerk", apparently.