Calculating the numbers.. at 6000 RPM, CRANK wheel is turning at 100revs/sec, cam at 50 So for 4 cylinder distributor thats: 2 pulses per revolution thus 200Hz. 6 cylinder distributor: 3 pulses per crank revolution thus 300 hz 8 cylinder distributor: 4 pulses per crank revolution thus 400 hz 60-2 crank wheel 60 pulses per crank rev thus 6000 hz 60-2 crank wheel with cam 60 pulses per crank rev thus 6000 hz 36-1 crank wheel with cam 36 pulses per crank rev thus 3600 hz 4-1 crank wheel with cam 4 pulses per crank rev thus 400 hz 8-1 crank wheel with cam 8 pulses per crank rev thus 800 hz 6-1 crank wheel with cam 6 pulses per crank rev thus 600 hz 12-1 crank wheel with cam 12 pulses per crank rev thus 1200 hz 40-1 crank wheel with cam 40 pulses per crank rev thus 4000 hz disty four style 50 off 40 on 2 pulses per crank rev (4 per cam) thus 200 hz oddfire 90 0,135 odd pattern, thus no constant freq portion Optispark 360 and 8 360 pulses per cam rev, thus 180 pulses per crank rev thus 18000 hz NOTE: max rpm about 15krpm MAX with this pattern before ISR overload... Sweeping on this one may have jitter issues too 12-3 oddball 12 pulses per rev thus 1200 hz 36-2-2-2 36 pulses per rev thus 3600 hz 4200 wheel odd pattern, thus no constant freq portion 36-1 mazda FE 36 pulses per rev thus 3600 hz mitsu 6G72 with cam 3 pulses per rev (crank) thus 300 hz Buell oddfire 4 pulses per rev (crank) thus 400 hz GM LS1 Odd pattern thus no constant freq portion Lotus 36-1-1-1-1 oddball 36 pulses per crank 3600 hz Honda RC51 wiht cam 12 crank pulses 1200 hz 36-1 with zecond trigger on 33-34 36 crank pulses 3600 hz 36+2-2 NGC4 36 crank pulses 3600 hz Weber marelli 8 crank 2 cam pulses 8 crank pulses 800 hz Fiat 1.8 16V Odd pattern Nissan 360 CAM wheel sensor 360 cma teeth (180 crank equivalent) 18000 hz NOTE: RPM limited to about 15K rpm Sweeping may introduce some jitter Mazda 24-2 caz (equal to 12-1 crank) 12 crank teeth 1200 hz