[vettestr]

MSD uses a multiple or 3 to 5 fire sequence's per cylinder at RPM's below about 2500 RPM. Given the speed of or the time allowed to supply a firing pulse it becomes impossible to continue above about 2500 RPM. The electron is damn quick but 3 to 5 pulses per stroke just becomes peaks in output but is always a continuous burn pattern in each cylinder.
The time or lack of becomes mind boggling..... 2500 RPM with 8 cylinders means it fires cyl. #1 2500 times in 60 seconds or it has 0.024 parts of a second to complete that one cycle. At say 3 pulses in that 0.024's of a second becomes 0.008 seconds per pulse width for the MSD to charge the coil and then discharge the coil to saturate and do it again. Then remember the engine is a 4 stroke ...wow! 7000 RPM / 60 = 0.00857's of a second.
To really screw with your mind think about what your connecting rod is doing. It is a length of metal with about 600 grams (a piston) of weight on the end. If the stroke is say 3.480 inch's long then we start with it at top of cyl. or TDC on firing cycle.
At 7000 RPM it moves from top of the cyl. or power stroke = from TDC is pushed down to bottom of cylinder or BTDC (first 3.480 inches of travel) and then is stopped at the bottom and then pushed back up (3.480 inches more of travel) to complete the ex. cycle then stooped at top ,now on the intake cycle it is pushed from the top back to bottom (so another 3.480 inches of travel) to get to bottom again so here comes the last ( 3.480 inches of travel) to get back to the top of cylinder on the compression stroke or cycle to complete just one complete firing cycle IE.. 1 RPM x 7000. Remember this the next time you miss a shift at 7 grand. The poor piston has traveled 3.480 inches 4 times for what we call 1 RPM 3.480 x 4 = 13.920 inches in 1 second. What is the mile per hour of piston or connecting rod speed? The real trick is getting pushed at this MPH and getting pushed and stopped up and down 4 times. It does kinda stop or is called dwell. 13.920 inches in a second, times 60 seconds = 835.2 inches times 60 sec per min. times 60 min per hour or 50112 x 60 = 3006720.0 inches per hour. So 3006720.0 inches / 12 in. per foot = 250560.0 feet per hour. or 250560.0 / 5280 feet per mile is 4176 miles of total piston travel in an hour at 7 grand. But from a start to stop and again and so on to get those 4176 miles of travel!!!! Buy GOOD parts or you will get to look at them in many small pieces. did I do that math right? I think so, but took a couple phone calls in between this mess I made, And I did not do drugs in college so no excuse at all. jeff C
Forgot to do spell check so??