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

[Milanoguy]

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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= 6 degrees per tooth) or the Ford (360 degrees/36 teeth= 10 degrees per tooth) instead the number is 2.74809 (rounded to the 5th place)  (360 degrees/131 teeth= 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?


		
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<DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>Hi</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT size=3><FONT face="Times New Roman">&nbsp;<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>Has anybody tried to use an<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>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.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT size=3><FONT face="Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>Would it be possible to take these two signals, run them thru some kind of microprocessor and signal conditioner and generate a<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>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?</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT size=3><FONT face="Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>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= 6 degrees per tooth) or the Ford (360 degrees/36 teeth= 10 degrees per tooth) instead the number is 2.74809 (rounded to the 5<SUP>th</SUP> place)<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>(360 degrees/131 teeth= 2.74809 degrees per tooth).</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT size=3><FONT face="Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>So the signal must<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>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.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT size=3><FONT face="Times New Roman">&nbsp;<o:p></o:p></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: justify"><FONT face="Times New Roman" size=3>Is this feasible? Or a dumb idea?</FONT></P></DIV><p>
		<hr size=1>Do you Yahoo!?<br> 
The <a href="http://my.yahoo.com">all-new My Yahoo!</a> – What will yours do?
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