BlueRockCrawler wrote:Albuquralque wrote:BlueRockCrawler wrote:34 teeth plus one missing tooth. The last tooth before the extra wide groove is TDC to the hall effect sensor.
Are you sure about it being the groove "before" the larger groove..........
No, I'm counting the raised parts not the groves through an "1 hole and obviously not doing well. This is why I asked if somebody who had one out had counted the teeth. as near as I can tell, it's the raised part right before the wide groove that's under the crank position sensor at TDC. Again if somebody had one out, they probably have a touch better view then mine.
Albuquralque wrote:Did you watch my video? It shows exactly the position of the flywheel at TDC.
gobium wrote:34 teeth
33 small grooves
One large grove
Large groove triggers the fire
2 teeth deleted to made on large groove
BlueRockCrawler wrote:Albuquralque wrote:Did you watch my video? It shows exactly the position of the flywheel at TDC.
Yes, and even tried to count the teeth, but I don't need to know where the flywheel is at in the peephole at TDC, I need to know what tooth is under the Hall sensor at TDC and the two are different.
gobium wrote:It was simpler back in the old days!
BlueRockCrawler wrote:Darrell, it doesn't work like that. The computer isn't using the CPS as a trigger per se, it just tells the ECU where the crank is and it does some amazing math and times events accordingly. It knows where the crank is and when to fire. But it's not a particular tooth that actually fires off the events, the ECU does, and it should be able to adjust the advance according to engine load, temp. and RPM. At the end of that video up above, you can see he has it set to keep a 10 deg. advance until it warms up and how he tells the ECU what the pattern is. This stuff is fascinating.
rivers wrote:You looking to mark the 4*BTDC mark on the flywheel? Use a "degree wheel". They don't cost much.
Maybe do a little more research on why there needs to be a groove in the flywheel that is larger than the rest.
I fully understand the CPS doesn't "trigger" the ignition to fire. But the pulsed (or square wave) signal from the CPS needs to have a marker signal that the ECU is programmed to recognize and know exactly where the crank is at when this signal is received.
It is fascinating stuff.
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