Honda Direct Fire Coils

[Eric Bryant]

Other than issues with not being able to fully saturate the coil, I don't
see a problem with firing them as a waste-spark setup.  I'm sure Honda
designed the coils and drivers to be used this way.  I'm not aware of any
motorcycles that use a cam sensor in a non-EFI application (there may be
some; I just haven't seen them).  You might want to look at the Yamaha R6,
since that also runs CNP in a carbureted application.

My Suzuki TL1000R uses a cam sensor to fire each plug only on the combustion
stroke, but it can run without the cam sensor as a waste-fire setup.  I'm
not sure what effect this has on spark intensity at high revs, since I
haven't done any dyno pulls in any limp-home modes:)

Eric Bryant
mailto:bryante at ghsp.com
http://www.novagate.com/~bryante 



-----Original Message-----
From: James Ballenger [mailto:vtjballeng at yifan.net]
Sent: Thursday, February 22, 2001 1:31 AM
To: diy_efi at diy-efi.org
Subject: RE: Honda Direct Fire Coils


    Honda did something similar on some new bike engines and these rev to
14,100 rpm.  The problem I ran into with my Haltech E6S is that I only had
two outputs to control ignition which would be very inefficient with these
coils because two would fully fire at each tdc and could cause problems.  If
you have 4 dedicated outputs and have a cam sensor you can run them but they
are expensive and by design less powerful than the large coils of units
outside the head.  The cool factor is extremely high though ;-)  I just
realized though that the 99' F4 runs coil per plug and they have no cam
sensor... hmmm.

http://planeta.clix.pt/cbr600f4/pics/600f4-12.jpg
http://planeta.clix.pt/cbr600f4/pics/600f4-25.jpg

James Ballenger
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