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So what are your cams? On your site I read:
The cam that we normally use in our street performance engines has 264 deg of intake duration and 268 deg of exhaust at .020 lift, with .285" lift at the cam and 110 deg lobe centers. But this tells you nothing about the most important design element of the cam - the shape of the lobes. More important than the duration at .020 or .050 lift, is the duration at .100, .200, etc. Our cams, especially the street cams, are designed to have as little overall duration as possible in order to assure that power and torque increases are produced throughout the RPM range with no loss of low and midrange power. With lobe shapes that open the valves more quickly than other cams with similar low lift durations, they have more duration at mid to higher valve openings, and produce more power. As the optimum requirements for the intake and exhaust are different, our cams typically have durations and lobe shapes designed to meet the separate requirements of the intake and exhaust.
Can you perhaps show us some pics of specific lobes, or figures on duration at different lifts etc. Or whould that be giving away your secret/knowlegde? I'm very interested in how the OHV cams can be improved. I've been pondering about our cams and I believe the design of cam/lifter is a problem since the lobe shape is limited because of the way cam and lifter interact. Can't this be improved in some way, using smaller bottoms on the lifter for example, or...
Anyway, can you tell anything abou the cams? I've emailed a few times regarding your cams, but never got a reply. Also, can you give some general info on the stroker 2.5 liter B20 just to make us drool? Man would that be a torque monster!! Do you have a specific cam grind for that engine, since engine geometry has change, and thus piston speed and thus intake/exhaust charges etc? Are there perhaps graphs of lobe shapes and/or valve actions or something?
Cheers, Ben Flierman
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P131, '65, B20B+M47. P131, '69, B20E+AW71L+LSD. (www.tinustechniek.tk)
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