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Superior Design= Superior Performance

Last Update: May 24/19

SDS CPI-2 Aviation Ignition System

The CPI-2 is the evolution of the original CPI ignition system. CPI-2 builds to a large degree on customer feedback. People wanted a smaller panel footprint, over voltage protection, integrated LOP function, larger display, aviation standard keypad color, LCD dimming, aural warning output, automatic backup battery switchover with integrated battery solution and the ability to data log. These features along with others, makes CPI-2 the most capable Experimental aviation ignition system on the market.

CPI-2 kit for Lycoming 4 cylinder engine. No wiring harnesses shown but these are included.

CPI-2 kit for Lycoming 6 cylinder engine.

  • CPI-2 gives you complete, user programmable timing control with rpm (100 rpm increments on direct drive engines) as well as manifold pressure (boost retard and vacuum advance)
  • Logical, 1 degree programming increments for all parameters
  • Small size of panel programmer- 2.8 X 2.8 X 1.2 inches deep
  • Integral MAP sensor
  • Rev limiting
  • Backlit LCD has gauge mode to display rpm, manifold pressure and actual ignition timing
  • 12V tach output
  • Programmable dwell time and cranking retard values
  • Single CPI-2 module can drive two coil packs for twin plug, 4 cylinder engines (Continental, Lycoming, Jabiru 2200, Rotax 912/914 etc.)
  • Based on proven SDS EM-5 and CPI software over 20 years experience and thousands of systems in service worldwide
  • MAP units display in inches of mercury absolute
  • Low current draw/ long spark duration. 4 cylinder coil pack and controller draw about 1.2 amps at 2500 rpm.
  • CPI-2 has a button to alter advance with mixture strength for best LOP cruise economy or swiching between mogas and 100LL.
  • Magnet alignment screen for fast crank sensor setup, error warning for missed magnets/ alignment issues
  • Coil test mode
  • Runup test for twin plug aviation installations
  • Simple wiring hookup, Wiring harness included made from Mil Spec Tefzel wire.
  • Hall Effect triggered. Flying magnets (supplied) can be mounted to crank pulley or flywheel
  • Magnets are crankshaft mounted so timing is precise, no worries about magneto gears, drives, bearings wearing or failing as on some other EIs
  • Never any "Lost Timing" scenarios as with other EI brands
  • No chance of engine kickback and broken starters when cranking as with some other EI brands
  • No electronics mounted inside hot engine parts like many other aircraft EI systems
  • No cooling blast tubes required like some other aircraft EI systems
  • No periodic inspections on mag gears, cotter pins, bearings, shafts, seals, PCBs like P-mag. Just check spark plugs during annual
  • All components firewall forward are waterproof unlike some other aircraft EIs
  • Our circuit boards are conformal coated in key areas to resist humidity, condensation and oxidation unlike some EIs which have bare boards
  • Coil packs are engine mountable
  • Bolt on kits for Experimental Lycoming 4 and 6 cylinder, Continental O-200, IO-550, Jabiru 2200/ 3300, Rotax 912/914 engines
  • Variety of coil pack mounts available for Lycoming engines- (top case, mag hole and firewall)
  • Backup battery option with automatic switchover and charging circuit
  • Over voltage protection
  • Ability to data log to a Windows device
  • Aural warning output
  • Automatic timing advance protection with MAP when LOP is engaged
  • Power saving options when operating on backup power
  • Adjustable display dimming and contrast
  • Status and warning LEDs plus screen messages tell you how the system is operating

  • Racetech/SDS has been selling EIs to the aviation market since 1997. We've built our reputation and business on reliable, affordable products and the best customer and tech support in the industry. You'll find us friendly, helpful and timely in our responses before and after the sale.

    Note the CPI-2 should only be used with resistor type spark plugs and good quality, EMI/ RFI suppression type plug wires. Never use non-resistor plugs or solid core wires. We can supply quality MSD plug wire, boots and terminals to fit most engines.

    Easy Programming and The Lean of Peak Switch Advantage

    SDS introduced LOP timing advance to the Experimental EI market in 2015. While other aviation EIs give you a canned timing curve which is often secret and hard to adjust, usually requiring extra cost options to observe and change, SDS CPI makes basic timing adjustments quick and easy to do and our LOP switch optimizes ignition advance when running LOP. This feature extracts all possible energy from the fuel, picking up a few knots which are lost when running leaner mixtures.

    Simple ignition curve programming in logical 100 rpm and 1 degree increments

    Programmable LOP advance amount

    The figure below illustrates how combustion flame speed changes with air/ fuel ratio.

    Notice how much flame speed slows down with lean mixture here. The SDS LOP switch advances timing when you are running LOP to achieve peak cylinder pressure at the optimal point for best torque.

    Notice how advanced or retarded timing affects the pressure vs. crankpin position curve. Unlike magnetos with fixed timing, CPI can deliver optimal ignition timing under all mixture, rpm and load conditions. EIs which cannot adjust timing when running LOP, lose efficiency compared with CPI

    Available in both single and dual controller configurations

    Optional backup battery detail. Tray kit is $140US not including battery. Order Powersonic battery PS-1227 from Amazon or Ebay.

    Optional mounting tray detail

    Battery and tray footprint is 5.25 long, 2.75 wide and 4.75" high

    Panel mount programmer showing Gauge Mode. Size is 2.8 X 2.8 X 1.2 deep. Serial cables exit the back.

    Displays main and backup battery voltage and shows which source is providing power.

    Audio control window

    On backup battery, coil B on

    CPI-2 can advance timing when only running on one coil

    Coil charge time is adjustable

    CPI-2 can log to a Windows device

    Thermal imaging test of the PCB during development and testing phase

    Optional vacuum block kit gives smoothest possible vacuum signal to the controller by averaging and damping pressure pulses. 1/8NPT fittings screw into your primer or injector ports. Block mounts with Adel clamps to 3/4" engine mount tubes. 4 cyl. block kit (left) $50US. 6 cyl. block kit (right) $75US


    CPI-2 hardware and basic features: https://www.youtube.com/watch?v=xq8jIAEU27o&t=32s

    CPI-2 running on our test Continental O-200 engine: https://www.youtube.com/watch?v=ykeNFBLUYEg&feature=youtu.be


    CPI2 programmer panel drawing updated Mar. 15/18

    CPI2 installation manual updated April 25/19

    CPI2 hardware installation manual updated May 24/19

    Kit Pricing (Lycoming)

    Single controller 4 cyl. $1656US (fires one set of plugs)
    Dual controller 4 cyl. $2628US (fires two sets of plugs)
    Single controller 6 cyl. $1960US (fires one set of plugs)
    Dual controller 6 cyl. $3160US (fires two sets of plugs)

    Our backup battery tray and wiring will be a $140 option on all systems. Battery is not included. Order a Powersonic PS-1227 from Ebay or Amazon.

    A single controller can also fire both sets of plugs if desired. Add $411 to the single controller price for 4 cylinder engines and $574 for 6 cylinder systems.

    April 26/19 Service Bulletin Regarding 18 to 14mm Spark Plug Adapter Installation

    Due to a number of broken brass plug adapters, we've changed the procedure for installing these as follows: 1. Thread the spark plug into the adapter 2. Torque the assembly into the cylinder head using the PLUG hex to 19 ft./lbs. 3. Torque the ADAPTER further to 25 ft./lbs. Use only a thin stripe of anti-seize compound on the plug and adapter. Do not coat the threads. Although we've done multiple yield tests on the adapters torqued into a fixture and they fail at 32-35 ft./lbs., a number of people were snapping them at the originally recommended torque of 22 ft./lbs.

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