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Things that make you go "hmm." (Hawk cams)
| Description | : | This is a comparison of a new camshaft I have designed (blue line) vs. the 174x8 race cam. The bike is a 700cc Hawk with 28mm valve heads. Lately I've been scratching my head a lot regarding camshafts, and have spent a lot of time trying to learn what the camshaft trends are in the upper levels of racing, whether that be motorcycles, F1, NASCAR, IRL, etc. The answer to that is, generally, shorter duration coupled with monster sized intake valves. Coming up with a new design for the Hawk presents a lot of problems. 1) Available cam profiles are few and far between, because of the rocker arm geometry. You can't just pick a cam profile already available from a shim under tappet engine, it won't work, because motion at the valve won't be linear. 2) It's not that easy to put appropriately-sized intake valves into the Hawk heads because, well, so many reasons I can't even begin to explain it. Because it's a 20+ year old design, that's why. The cam I've come up with combines some profiles that exist, but I'm not saying much more at this point because I've spent too much time working on this to give it all away. Suffice it to say, the cam works and I'm relatively happy. (even tho it is a compromise) My goal was similar top end power to the x8 with more midrange, and that's exactly what I got. You'll note that some information is missing from the dyno chart, I have my reasons for that... mainly because I want you to look at the shape of the curves and not get all caught up in "the numbers." Also I'm still working out some fueling kinks in the area after 8500 rpm, some different main air jet calibration is needed. A work in progress- I will update as I accumulate more data. |
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