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Date: Mon, 12 Dec 2011 08:51:36 -0500
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Subject: Re: [LML] Electronic Ignition System Application
From: Colyn Case <colyncase@earthlink.net>
In-Reply-To: <list-5301113@logan.com>
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References: <list-5301113@logan.com>

Brent,

sounds exciting.   Does Monty's process allow you to control max =
cylinder pressure?  Does he assume certain mixtures at certain power =
settings?  (e.g. full rich at max MAP)

Colyn


On Dec 12, 2011, at 7:52 AM, Brent Regan wrote:

A while ago I was approached by Monty Barrett of BPA to develop and =
ignition system for the 9 cylinder M14 radial engine. The magnetos for =
these engines were out of production and unreliable. We applied our =
experience designing certified aerospace electronics and came up with a =
magneto replacement system with a Timing Controller that featured an =
internal poly-phase alternator, manifold pressure sensor, independent =
High-Q magnetic flux sensors and dual microprocessors with cascading =
redundancy. Everything is packaged in a billet machined, O-ring sealed =
MIL-Spec, water and dust proof anodized housing. The Timing Controller =
is coupled to independent "Coil Near Plug" high energy Smart Coils that =
deliver a measured 80+mJ of energy to the spark plasma. The entire =
system is rated to 125 degrees C operating temperature (257 degF), 10G =
sign-on-random vibration, direct and indirect lightning effects as well =
as a host of other DO160F test requirements.

While we were designing this system it occurred to me that I would like =
a couple of these on my IV-P, so we designed it so it could accommodate =
6 or 9 cylinder engines. The only difference being the internal sensor =
ratio and firmware.

The system components have passed qualification testing and the 9 =
cylinder system is currently on the BPA dynamometer undergoing =
performance mapping and endurance testing. This is where we develop the =
advance parameters for RPM and manifold pressure. It really isn't =
practical to attempt to develop these advance curves without a =
dynamometer.

Monty at BPA is currently booking orders for the 9 cylinder M14 system. =
The problem with the 6 cylinder "market" is that there are many =
variables and each significant variant of manufacturer, induction system =
and compression ratio needs to be dynomometer qualified. So, to solve =
this problem Monty will be offering a significant discount on the =
ignition system to select 6 cylinder customers who have BPA perform =
their overhaul and consent to having Monty performance map their engine =
after the post overhaul dyanamometer run-in.

The reason for the dyno testing is that it is not a good idea to just =
make a guess at the correct timing based on RPM and manifold pressure =
and then go fly. That would be like buying a suit out of a catalog. A =
good outcome is unlikely.

The attached picture shows the Timing Controller. It replaces the =
magneto and contains the poly phase alternator, electronics and manifold =
pressure sensor. The MIL-Spec connector is the interface to the =
individual coils. The red cap covers the -4 JIC threaded fitting for the =
manifold pressure connection. Under the blue cap are the firmware update =
connector and integral static timing light. There is NO separate "Brain =
Box" to deal with.

The system is not available for 4 cylinder engines at this time.

If you are interested, contact BPA http://www.bpaengines.com

Regards
Brent Regan

<ZIS Timing Controller.jpg>--
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