My UPS scale and my digital fish scale agree that the

Mazda coils

(with mounts)
weigh 4 lb 9 oz and 2 lb 11 oz respectively.  Total is 7

lb 4 oz.

Ken Powell

I only weighed one.  Forgot that they were different.

Jerry

Are these CDI coils or is Tracy using transistorized ignition

(i.e. 12V

on

the primary vs. ~300V for CDI)?

Eric Holmberg
Express 2000 FT

I'll let Tracy answer that. Tracy?

Paul Lamar

The AC Delco coils  are magnetically biased inductive ignition

coils with

their own igniters and current limiting circuitry.  Magnetically

biased

means they have a very high energy spark in spite of their small

size.

Others may disagree (and I'm sure they will :)  but I think  CDI

does not

have any advantages in our (aircraft) application when the engine

is run at

7000 rpm or less.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

By their own igniters, do you mean that they have the drive transistors
built into them?  Along with current limiting once the core is
saturated?

Yep, I agree with you and see no reason to make things complicated with
CDI unless it's for a reason :)  I'm currently trying to do some
ion-current measurments, so I'm going to build a CDI system so I can
burn my fingers a litttle while prototyping :0

-Eric Holmberg
Express FT

 
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