electronic Ignition with 24 Volt syst?

Ruffair · #1 08-30-2013, 10:59 AM

I am having IO-360-A1B6D built up. It has the single drive, dual mag setup.

I want to use electronic ignition. The single hole in case for mag drive will not let me use Pmag, so other option is EFII or Lightspeed.

Other problem is I have 24 Volt system on aircraft, Main reason for 24 V is to operate the Electric motor for Landing gear. ( aircraft is Zlin)

Any ideas how to get 24v for gear, and 12v for ignition? What alternator output.
Fuel boost pump could be 12 or 24v. Prefer 12v.

Thanks, Kem

Mike S · #2 08-30-2013, 11:16 AM

Kem, welcome to the good ship VAF

Radomir · #3 08-30-2013, 12:30 PM

LSE will take 24V... http://www.lightspeedengineering.com...lasmaINPUT.pdf (pin 7 and 8) so I wouldn't bother with a separate 12V system for that..

mannanj · #4 08-30-2013, 01:27 PM

I have Robert Paisley's EFII ignition in my IO-360-A3B6D. I have his redundant system with dual everything, including battery. It is a very good, efficient system and with tuned injector nozzles from Airflow Performance, I can lean mine out to 6 to 7 gal. per hour at economy cruise.

I'm not sure, check with Robert but I'll bet he can set you up with a 24V system.

I'm sure that you'll like his set-up. It's worthwhile checking into.

Ruffair · #5 08-30-2013, 10:15 PM

Mike, thanks for the welcome..!
Radomir, Thanks for the info. I talked with LS and was recommended the "Mini Sensor" setup, Looks like they can go from 5 to 35 Volts.
Mannan, thanks, I researched the EFI's and like what I see/hear, spoke with Robert yesterday, he indicated 12 volt was all he could do. I'd really like his boost pump too, but it too is 12v. By the way, your paint job would look good on my Czech airplane..!!

Kem

Johnnybgoode · #6 08-31-2013, 05:22 AM

Various converters are available to do the voltage conversion - a black box with 24V in and 12V out with various load capacities.
Did I misunderstand that part of your question? I recently got one for around $200, if I remember correctly.
PB

rbibb · #7 08-31-2013, 06:52 AM

A large voltage regulator chip rated at the amperage needed with a big heat sink would provide needed conversion but you'd need to rig two for redundancy. If electronics ain't your thing find someone in an eaa chapter to work the details. I'm sure there are commercial units available but for maybe $20 bucks in parts you could make your own.

Ruffair · #8 08-31-2013, 02:14 PM

JbGood, and rbibb, Thanks for the input.
the 24 to 12 volt converter/regulator chip, is what I am now studying.

Because of the 24v landing gear motor I plan to hook up 2 batteries
to make 24v. And plan to use a 24v alternator, for charging and operation of the gear.

Then it looks like using some adult supervision, install some converters to step down voltage to 12v. Have a 24v bus and a12v bus for the EFII boost pump, and electric ignition, with plans to have alternate system for "essential power" in case of primary electrical failure.

Your input helps get my mind opening up to the different possibilites. Thanks..!

Kem

rcpaisley · #9 09-04-2013, 02:17 PM

Hi Kem,
A quick Google check brings up lots of 12V to 24V step up converters.
This would allow you to go 12V on your electrical system, alternator, battery and have the 24V only for your landing gear.

Depending on the current requirement for the landing gear, this might be the simplest solution.

Robert Paisley

rcpaisley · #10 09-04-2013, 02:23 PM

There are a ton of these on Ebay.
Here is a 15A model:
http://www.ebay.com/itm/DC-DC-Conver...item1c1d788f76

Search: 12v 24v step up converter

Robert