Electromotive xdi, Руководство по установке и инструкция пользователя

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XDI Manual Version 1.8 Page 20
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2017 Electromotive, Inc.
Firing Order must be separated in order to fully understand what is occurring on an odd-fire distributorless
ignition.
4.2.g To find the TDC Event Order :
1. Turn the engine to TDC #1.
2. Rotate the engine in its normal direction of rotation.
3.
Record the order in which the cylinders have TDC’s. It does not matter that the TDC events are
mixed between compression and exhaust during this process.
4.2.h Rotary Engines
Single Tower Coils are used for this application.
For rotary engines, the coil firing occurs on both the leading and trailing spark plugs. For a 2-rotor
engine, 4 single tower coils will be needed. References to DFU #1 will correspond to the 2 primary spark plug
coils (coil outputs A1 and B1), and will fire the
leading spark plugs on rotors 1 and 2, respectively.
References to DFU #2 will correspond to the 2 secondary spark plug coils (coil outputs A2 and B2), and will
fire the
trailing spark plugs on rotors 1 and 2, respectively. Typically, rotaries work well with about 7-15
degrees of split between the leading and trailing ignition under light load . This timing split option is only
available to XDI-2 users. Under full load, the engines generally make best power with closer to zero degrees
of split. A rotary will run on just the leading or trailing ignition, but a power loss will occur. Keep this in mind
when trying to diagnose ignition wiring problems.
Rotor 1 -- Leading : Coil Channel A1 Trailing : Coil Channel A2
Coil Channel A1 and A2 are split by the value in the Dual Plug Timing Split. (XDI-2 only).
Rotor 2 -- Leading : Coil Channel B1 Trailing : Coil Channel B2
Coil Channel B1 and B2 are split by the value in the Dual Plug Timing Split. (XDI-2 only).
4.2.i Dual Plug Engines
For dual plug engines, there are two spark plugs per cylinder. Although it may seem that you should
connect both towers of one coil to the two spark plugs of one cylinder, this is NOT the case. Doing so would
require one coil to fire two spark plugs that are on the compression stroke, which would have a very negative
effect on spark energy. Instead, the coils must be wired so that each cylinder will have two coils for its two
spark plugs. Refer to the example of the 6-cylinder Porsche Dual Plug engine (
Figure 7 ) in conjuction with the
example in (Common Engine Setups) to see how the wiring should be done.
Since most dual plug cylinder heads have a hemispherical design, the spark for both plugs on an
individual cylinder should occur at the same instant for optimum flame-front propagation.
Figure 8 : 4-Cyl DFU Setup