Igniters => DIS
Bob Wooten
r71chevy at earthlink.net
Thu Mar 1 02:45:37 GMT 2001
Jurgen,
thanks, if you run across the info on the Motorola chip I would be grateful.
I would go search their site but what site do I search (Motorola, Cheri or
ON semi)? if you cant come up with it, I'll get over it. maybe first I
will check the archives for the CNP or was the reference to DIS & Waste
spark?
I know it is a bunch of work, but it keeps me out of the bars & stimulates
the mind. I am running a 383, super ram, 700r4 & a 7730/8D. check it our
if you'd like www.r71camaro.homestead.com
BW
-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Jurgen Hartwig
Sent: Wednesday, February 28, 2001 8:43 AM
To: diy_efi at diy-efi.org
Subject: Re: Igniters => DIS
> I have been working on my little DIS project & am counting on the coil
> charging for a maximum of 3/4 of a rev of the crank. this being the
case @
> idle the circuit would have the longest "on" time @ 23.1 mS @ 650 RPM, &
the
> shortest time of 1.5 mS @ 10K RPM (yea like my stroker is going to get
to
> 10K, God I hope not or I will put small bits of stroker all over the
road).
> think that this would be too long @ idle? I am going to mock it up with
> LED's @ first & the plug the coils in later & see what happens.
>
Bob, in two pieces of literature I have (Ford FI manual and Wolf 3D
manual), coil dwell, or charge time, is between 4ms and 6.5ms. I believe
those are constant dwell times, and if that is true, then 23.1 ms is
probably too much. There is a Motorola chip that controls dwell.
However, I forget the number. I can try to find it if you would like, but
to be honest, fabricating all this sounds like a lot of time.
>
> if this does happen to be too long a charge time then maybe I will give
> James a ring & see if I cant get some of those smart igniters from him &
> skip the IGBT all together. I would much rather pay the $4 each than
$30
> each for igniters though. specially if I goto CNP ($30 X 8 = too much)
>
Bob, if memory serves, those CNP setups already have igniters on board.
$240 for CNP, or $20 * 4 for GM coils + $30 * 4 for smart igniters. If
you check the archives (1999) somebody (Gar or Bruce or perhaps Shannen)
had done a writeup about CNP. I can't remember if they are TTL. If so,
they might be your cheapest route. I can't remember what setup you were
running (what fuel injection system? Aftermarket or OE?)
Jay
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