Dwell and HEI's

[Paul Ruschman]

	My reason for asking this is due to the limited RPM I have read about the GM HEI. My V-8 Datsun Z seems to run out of ign. at about 5500 RPM but my engine will run to 6500+ RPM. I have read the Jacobs guide to optimizing your ign. and I am going to buy the GM performance coil Jacobs recommends for the HEI but it did not mention anything about improving the coil saturation time. I am not really sure if this is really a issue but I have also read that the HEI falls off at higher RPM's due mainly to the module not being able to keep up.
	Any thoughts?

		BRAAP

	Life is a journey, enjoy it in a  HIGH powered Datsun!

http://www.datsuns.com/projects/paulrproject.htm

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From:  bamcknig at postoffice.syspac.com[SMTP:bamcknig at postoffice.syspac.com]
Sent:  Friday, February 20, 1998 10:22 AM
To:  diy_efi at efi332.eng.ohio-state.edu
Subject:  Re: Dwell and HEI's

Why all the concern about dwell?
My understanding:
If there is too much, the coil gets hot and maybe burns up.
If there is not enough, you get a weak spark.

Gm  uses the same module - reluctor coil- Hi voltage coil etc. on 
both their 4 and 8cyl vehicles.  Over a very wide rpm range. 

Is anybody out there having a problem with dwell?

I suggest not unless they are running a v-12 at very high rpm.

Tkhat was one of the problems solved by electronic ignitions that 
seemed almost impossible to economically solve with mechanical 
points.

Bob McKnight
Phx AZ