General > In General...
True Horsepower- an inside look at honest horsepower
musturbo:
I know this is a car, but this is what I mean when hp doesn't mean a whole lot.
Minnetonka_Mark:
I saw the article about True Horsepower. For me the key point was NOT the peak horsepower. Instead, examine each of the graphs taking close look at the power output in the range just above idle, say 2K to 4K RPM. I don't have the graphs in front of me as I'm writing this, but I recall that the KX500 engine is COMPLETELY in a league of its own just above idle. Just above idle the engine output very quickly reaches 40HP. Then it gradually builds to 60HP. NONE of the other large displacement engines make much more than 20HP just above idle. Take your properly jetted KX500 out to the paved street in front of your house, i.e. someplace where the tire hooks up well, and twist the throttle just a bit while in second gear. You'll immediately feel that HP surge. When you're riding on dirt the rear wheel just throws dirt so you don't feel the low RPM power output as much. The KX500 has an amazing engine.
delusionised:
--- Quote from: Minnetonka_Mark ---I saw the article about True Horsepower. For me the key point was NOT the peak horsepower. Instead, examine each of the graphs taking close look at the power output in the range just above idle, say 2K to 4K RPM. I don't have the graphs in front of me as I'm writing this, but I recall that the KX500 engine is COMPLETELY in a league of its own just above idle. Just above idle the engine output very quickly reaches 40HP. Then it gradually builds to 60HP. NONE of the other large displacement engines make much more than 20HP just above idle. Take your properly jetted KX500 out to the paved street in front of your house, i.e. someplace where the tire hooks up well, and twist the throttle just a bit while in second gear. You'll immediately feel that HP surge. When you're riding on dirt the rear wheel just throws dirt so you don't feel the low RPM power output as much. The KX500 has an amazing engine.
--- End quote ---
key point for me is thats probably the last dyno we are ever going to see printed in a magazine :!: sad but true, sucks big time
Ramski:
Let's not forget the pressure Yamaha and Suzuki put on the AMA to drop the 500cc nationals. Like it's been said before. It's all about money. The only improvement they could really make to a two stroke motor was make it more eco friendly. They saw a lot more potential for improvement in the four stroke motor, plus let's not forget the parts departments are making a killing. Those 250fs are ticking time bombs and cost a fortune to rebuild if they grenade! :(
Polar-Bus:
--- Quote from: mikesmith on May 17, 2005, 07:06:24 PM ---The 4-stroke advantage is in tractable easy to ride power delivery (not as much skill as a big 2-stroke takes),2-stroke takes a skilled rider to go fast and not waste power or let the bike wear you out.4-strokes are here because of the EPA and manufacturers make more money in parts and dont forget the public "me to" mentality.
--- End quote ---
VERY well stated. Ive owned both. Even though a KX5 peaks @ 60 hp, its VERY difficult to put that 60 hp right to the DIRT. You average 450 puts out approx 10-12 less hp, BUT with the engine firing every 4 strokes instead of two, they are superbly efficient at putting traction down into the dirt. Traction being equall, a KX5 should spank the snot out of a 450 4 stroke. BUt in a race there are always so many variables that change the overall outcome.
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