[Diy_efi] RE: Using Flywheel as RPM/TDC Sensor?

[Steve Ravet]

________________________________

	From: diy_efi-bounces at diy-efi.org
[mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Milanoguy
	Sent: Thursday, December 23, 2004 12:05 AM
	To: diy_efi at diy-efi.org
	Subject: [Diy_efi] RE: Using Flywheel as RPM/TDC Sensor?
=09
=09

	Hi
	Has anybody tried to use an  existing flywheel as a crank sensor
for an EFI system? I was thinking of using the ring gear teeth and a
hall effect sensor as the rpm sensor and a magnet screwed to the
flywheel as the number one cylinder TDC indicator.
	Would it be possible to take these two signals, run them thru
some kind of microprocessor and signal conditioner and generate a
combined signal that would be acceptable to a EFI CPU that is expecting
either a Bosch 60-2 signal or the Ford 36-1 signal?
	The flywheel I intend to use has 131 teeth on the ring gear, 360
divided by 131 does not generate an even number like the Bosch
60(360degrees/60 teeth=3D 6 degrees per tooth) or the Ford (360 =
degrees/36
teeth=3D 10 degrees per tooth) instead the number is 2.74809 (rounded to
the 5th place)  (360 degrees/131 teeth=3D 2.74809 degrees per tooth).
	So the signal must  first be converted into a more reasonable
number and then the flying magnet signal must be merged into the signal
to look like a missing teeth signal.
	Is this feasible? Or a dumb idea?


------------------------------------------------------------

Feasable, certainly, but is it more or less work than mounting the
appropriate wheel?  There was a batch or 2 of wheels made for the efi332
list if you're looking for a source for wheels.

--steve


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