Cdi rpm range

[Guest |167|]

In the specs of the xps-4, this is written: This unit is capable of full ignition output power up to 10500 RPM and will function even in 8 cylinder applications.

Does this mean that this setup is not recommended for rpm's exceeding 10500?

[rayhall]

The XPS-4 will operate above 10,500 rpm. This rating is for a twin rotor engine with leading and trialing spark plugs. On a four stoke engine the demand from the CDI is less. The XPS-4 has twin dump capacitors. This means one capacitor is charging while the other fires. This means spark power does not drop as the rpm rises, unlike single dump capacitor CDI.

Ray.

[Guest |167|]

The application is a high rpm pheripheral port twin rotor.

Is there quad capacitor cdi's available that would better support higher rpm on twin rotor?

The customer already have a Autronic cdi, but is swithcing to V88 ecu, and would like all hardware of same brand if possible without loosing functionality.

I noticed that Autronic claims higher supported rpm's.

[rayhall]

The XPS-4 CDI will work to 15,000 rpm on a twin rotor engine. Even if the engine revs to 16,000 or 17,000 the CDI will still work. It does not just stop working. As you go above the 10,500 rpm the spark power starts to drop away a little. The engine needs the maximum spark power at the engines maximum torque rpm, not its maximum.

I guess if you had an engine with maximum torque at 12,000 or higher, then a four capacitor CDI may be an advantage. The XPS-4 is used on drag racing and circuit race cars that rev over 11,000 rpm. The Leanne Tander RX7 circuit car is just one of them.

Ray.