Tomorrow is the Triumph club meeting in the month when I do the dyno work. The testing plan is given to the service department after the meeting and they reserve me a day or two on the dyno. This happens every year. So, I went to work an hour early and got off an hour early. Then, I walked home, got Vizard's books and all sorts of calculations and rode the 250 down to the local. Always I stand at the bar, order a pint, disengage the brain, and engage the mouth. Today I quietly sat at a table and set to work. Basically, after a pint of serious thought and lots of head scratching, I come the conclusion that there are three viable cam options and who knows which is best. The plan is to do:
Session 1: Sunoco Supreme with high lift exhaust cam used as intake cam, 9 teeth retarded, producing 15 BTDC intake opening, 114 intake centerline, 105 exhaust centerline, 109.5 lobe separation angle, with 32 overlap, all at .050, then switch to:
high lift exhaust cam used as intake cam, 10 teeth retarded, producing 30 BTDC intake opening, 99 intake centerline, 105 exhaust centerline, 102 lobe separation angle, with 47 overlap, then switch to:
medium lift intake cam used as intake cam, 0 teeth retarded, with 15 BTDC intake opening, 112 intake centerline, 111 exhaust centerline, 112.5 lobe separation angle, 32 overlap.
Session 2: use Sunoco Supreme with best cam combination from Session 1. Optimize ignition timing and jetting. Install 4 sizes larger main jets and retard timing 2 degrees. Use Pendine blend jungle juice. Optimize jetting and timing if this shows potential for more HP.
That's the plan.