I compared the grinds of the Hot Cams and the Web Cams and Web has three stages with more lift and duration. Also, Hot Cams does not have the decompression mechanism on their cams. I will be posting dyno runs for the Web cams this week.
TC RACING has cams for the Z400. Think the guy said it was $189 w/exchange. I'm going with him even though it might be a little more than everyone eles's. He been doing Doug Gust work on the DRZ400. He also builds some real good 4-stroke motors.
Hi-perf cams let more in and out which creates more hp. The stages r how 'aggresive' the cam is. Stage 1 is mild and stage has a little more, but Hot Cams rn't very aggresive to begin with. I think Web Cams is the way to go.
High performance cams open the valves earlier, and/or open them faster, and/or keep them open longer, and/or open them farther. The longer the valves are open and/or the farther they are open, the more fuel/air mixture is let in, hence the more power is produced. Theoretically.
BTW, WP (or anyone who can answer the question), what the devil is a decompression mechanism?
Theres alot more to cams than just duration and lift. There is whats called overlap, overlap for those who dont know is when the intake and exhaust cams overlap. At high rpms this can make big power. when the exhuast opens at the same time as the intake it actually pulls the freash are into the cylinder, and the intake air pushes the hot exhuast gases out. Problem is, if a cam has a ton of overlap generally the bottomend is a little choppy. So generally that is why a mild cam generally makes more bottom-mid range, and the more lift and duration generally overlap occurs and you get more top end. If I was running a rec motor i would lean more toward duration that lift. as lift tends to put more wear on valvesprings and lifters.
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