ORIGINAL: speedracerntrixie
ORIGINAL: bjr_93tz
Ummm, minimum rpm to excite the sensor? They use a traditional magnet/hall sensor arrangement don't they?
Warming up your pitching arm for a speed of sound 270degree flip died out with magneto ignition.
BTW the cdi in the YS will fire at near zero rpm, it just needs to see the magnet move away from the sensor. The only ''problem'' with the YS arrangement is that at hand flipping speed it's probably going to spark at 20+ degrees before top dead center.
As stated in a previously, it's the firmware that was burned into the IC controling the CDI. It would be an easy change for OS to make. I guess the Hobbico guys arent going to address that for us. As far as the YS, it should be starting up at close to zero. The placement of the sensor is not always the point of fire. Some ignitions have you set them up at zero and then advances as the RPMs go up. Some ignitions have you set them up 28 degrees advanced then start up at a full retard and decrease the amount of retard as RPMs increase.
Yep, and the maximum delay for the "YS" cdi is about 9.5ms meaning the slower you flip it the more advanced the spark. If you can flip it at about 500rpm then you'd get pretty close to sparking just before or at TDC, any slower than that doesn't bear thinking about.
I'm just struggling with the idea that a slow flip on this OS engine would result in the CDI not sparking, I can understand this if the CDI is programmed to see a couple of pulses, calculate the rpm, then start firing which would mandate the use of an electric starter, but I'm not sure how the OS cdi knows it's going too slow from a single flip, not unless it measures the pulse width as well as frequency?
Anyway, not wanting to hijack a very interesting thread, I hope things sort themselves out as the more options we have in pattern the better.