[Diy_efi] 2.0 diss module with the 1227749

[William Shurvinton]

Please turn off html. You mess up the archives.

If you are using a GM DIS it uses a hall effect sensor. These give a TTL
output. GM crank wheels are very small as they fit behind the balancer wheel
in most cars.

A reluctor is more speed controlled. That is why zero crossing detectors are
used. How on earth do you think an HEI module gets an accurate signal with
only a 1" diameter star wheel.

Diameter matters not one jot unless you go out of your way to badly design
things.
----- Original Message -----
From: Djfreggens at aol.com
To: diy_efi at diy-efi.org
Sent: Thursday, September 12, 2002 4:27 AM
Subject: Re: [Diy_efi] 2.0 diss module with the 1227749


well here is my thought on this very subject and i will take any flames or
compliments.as the diameter of the wheel decreases the speed of the trigger
will go down at the outer most edge. even if the wheel were the right
pattern this change in speed could drive the module nuts. think about it now
the wheel is going solwer with a smaller trigger area. even properly scalled
its still not what it had when it was first desinged. by changing the
dimension of the wheel you could be inadverently scrweing with it. its
actually apretty simple concept really a 36x drive cant read a cd rom disk
spinning at 48x speeds can it ??


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