Difference in CC's

greenspun.com : LUSENET : Junkyard Wars : One Thread

I am building a go Kart/buggy with a 8HP Briggs engine. I noticed reading through the engine specs, that it is 366 CC's. Now, in researching how to build a Go Kart (Not asking for free plans, but designing myself) I started looking at factory built karts, and it seems that the new 8HP Briggs engines are 150CC's, and a lot less tourque.

Can someone explain to me how 8HP is acheived with less then half of the engine capactiy?


-- Leroy McDonough (ootm_hollis@yahoo.com), December 09, 2004


Horsepower is acheive through multiplying torque by RPM. so, the newer engines probably have a higher RPM. DUHHHH! just kidding

-- George (sciencedude7@hotmail.com), February 01, 2005.

I just checked their site and found that their 8hp horozontal genpower engine is 305 CCs. I think that the difference would be derived from craftmanship and design. One way to look at it at an extreme is to think of the fact that a supercharged engine can have the same CCs as another unsupercharged one and have alot more HP. Better design can lead to HP increase because there are many other factors besides size of the cylinder that effect the HP.

-- robbie (nostrebor321@aol.com), February 04, 2005.

Horsepower is a product of torque and RPM, but that's not the only reason for the difference (DUHH!! you wanktard). As has been stated, different designs yield different power output. We're talking about differences in compression ratio, bore to stroke ratio, boost, head shape, side or overhead valves, valve size, number of valves, valve timing, port size and shape, carb size, exhaust system, flow restriction, air filter, spark plug orientation, ignition system, fuel mix, fuel type etc. Don't forget the most obvious - what type of engine it is. Two stroke? Four stroke reciprocating or rotary?

-- mark hooper (mhooper@hotmail.com), February 11, 2005.

Moderation questions? read the FAQ