The NC billet base plate/heat sink is designed to be bolted to
 the back side of the firewall with a couple of small
 holes for the AN style connectors. The 2.5 inch high
 cover is deep drawn aluminum 1/16th inch thick.

 What do you guys think?

 Paul Lamar



 Paul:

 You might want to consider mounting the Multistrike CDI Packaging
 to the inside of the firewall (cockpit side)----------------so it
 is subjected to less heat? How much heat will the CDI box produce?
 How hot is the engine side of the firewall? How reliable are the
 electronics at that temp? How much more reliable would they be at
 the (lower) cockpit firewall side? Is it easy to route the 300V
 wires thru the firewall to the coils? I do know the suggested way
 to penetrate the firewall is to drill a hole and route wires thru
 a piece of (slit) silicon tubing, then smear more high temp silicon
 around everything on both sides (quite inexpensive, effective, and quick).

 I do know Tracy Crook wants his EFI box mounted on the cockpit side
 of the firewall---------------probably for heat and vibration reasons.
 Would there be a reliability benefit if vibration isolators were used?

 Thanks and regards,



 cozyflyr

 "The American republic will endure until the day the Congress discovers
 it can bribe the people with the people's own money."
 - De Tocqueville - 1840


 Yes that is what I meant by the back side of the firewall.

 Paul Lamar



 Hi Paul

 Thinking out loud, love the idea of custom milled heatsinks etc, but how
 about using a ready made solution, how about some of the inverter boxes
 that
 you already have?

 Or instead of deep drawn box 4" x 2" alloy tube cut to suit and heatsinks
 on
 ends.

 Just an idea.

 Clive

 Not a bad idea. The trick is screwing the heat sink to the
 thin wall tube and getting the FET's near the end of the PC board.
 There are limited sizes of extruded tube.
 To cut the cost of the PC board it should be 2.5 by 3.8 inches.
 That is a standard size.

 The deep drawn cans are off the shelf from Zero Manufacturing


 There are some neat extrusions out there with built in heat sinks
 but I have not found the source company that makes them yet. Perhaps
 they are proprietary to the inverter manufacturer.

 Paul Lamar


 Try a search based on "heat sink extrusion".
 Here are some results.


http://www.mmmetals.com/pages/extrusion_profiles/extrusion_tables/single_and_double_channel_heatsink_aluminum_extrusion.htm
 http://www.aavidthermalloy.com/products/heatsinks.shtml
 http://www.alexandriaextrusion.com/aec/capabilities/heatsinks.cfm
 http://www.qats.com/Products/Heat-Sinks/Extrusions/2.aspx
 http://www.himfr.com/buy-heat_sink_extrusions/

 C. Smith


 Thanks Craig.
 I looked at most of them. The bottom line is they will
 have to be machined some what anyway. They are also not
 cheap. If I have Jeff make it I will get exactly what
 I want.


 Paul Lamar


Paul, Will the CDI and fuel injection eventually be in a single enclosure or
at least on a common base.  If it is separate bases how many individual
boxes for a two rotor with 4 spark plugs and 4 fuel injectors and the power
supply. Also assuming much of the interconnecting wireing can be on the back
side of the firewall, how many connecting points pass through the firewall.

george grimes

The plan right now is to use three Mazda 2nd gen coils.
One waste spark for the leading plugs and two coils for the
trailing plugs. All electronics except the hall effect sensor
are in one box if I can except for the coils of course.
It really depends on electrical noise considerations.

There are also some new MSD coils on the market including
a waste spark version that will also work.

It will be ignition only and not dependent on a fuel injection
computer to fire. The ignition will be stand alone.

IMHO the carb solution has been underutilized on the rotary.

I think a tuned p-port intake manifold with a 2 barrel Holley
will get people up and flying sooner and cheaper and be almost
as good as EFI with well over 200 HP.

Paul Lamar