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post #11 of 16 (permalink) Old 03-10-2012, 07:56 AM
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For the first couple years the H-D ECM program required cam angle and crank position signals to determine where the rotating assemblies were positioned . After '01 they determined the crank signal was all that was really needed , plus it was a cost saving feature .
I could see that with two cams and two cylinders, with just the crank sensor alone, the ECM might not be able to determine where each piston was in its cycle ????
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post #12 of 16 (permalink) Old 03-10-2012, 08:08 AM
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In a TC engine if something happens with the cams , chain breaks or something , the engine isn't going to run anyways . The crank signal lets the ECM know where the pistons are located at all times and that's really all that's critical . It's a step count setup and when the step count gets interrupted the ECM sets a code and turns on the engine light .
Many EFI auto systems use both a cam and crank sensor set up .

Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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post #13 of 16 (permalink) Old 03-10-2012, 08:18 AM
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Thank you!
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post #14 of 16 (permalink) Old 03-10-2012, 12:58 PM
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Quote:
Originally Posted by SCHMIDTYS View Post
In a TC engine if something happens with the cams , chain breaks or something , the engine isn't going to run anyways . The crank signal lets the ECM know where the pistons are located at all times and that's really all that's critical . It's a step count setup and when the step count gets interrupted the ECM sets a code and turns on the engine light .
Many EFI auto systems use both a cam and crank sensor set up .
Correct Schmidty. Cam and crank timing are noted on cars due to variable cam timing, with regards to engine power and of course, EPA requirements.

As for the module idea, you are likely right, in that it's for carb only, not EFI.

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post #15 of 16 (permalink) Old 03-10-2012, 01:04 PM
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Originally Posted by Tucson_Tim View Post
I could see that with two cams and two cylinders, with just the crank sensor alone, the ECM might not be able to determine where each piston was in its cycle ????
The engine fires at specific degrees, (315* and 405*-Dual fire and 705* single fire) which are noted on the flywheel. Crank sensor reads the flywheel's postion, reports to the ECU and ECU tells coil to fire. ECU also controls all timing curves and changes through the rev range.

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post #16 of 16 (permalink) Old 03-10-2012, 01:09 PM
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The engine fires at specific degrees, (315* and 405*-Dual fire and 705* single fire) which are noted on the flywheel. Crank sensor reads the flywheel's postion, reports to the ECU and ECU tells coil to fire. ECU also controls all timing curves and changes through the rev range.
Thanks. I think I need to read up on the ECU and stop asking these dumb questions.
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