Nu hittade jag det jag sökte angående duration. Jag kom dock ihåg fel. Det skall vara vara ca 26 graders duration på gnibban men förtändningen ligger på runt 60 grader.
Ignition and timingEdit
The air/fuel mixture is ignited by two 14 mm (0.55 in)
spark plugs per cylinder. These plugs are fired by two 44-
amperemagnetos. Normal
ignition timing is 58-65 degrees
BTDC (This is dramatically greater
spark advance than in a petrol engine as "nitro" and alcohol burn far slower). Directly after launch the timing is typically decreased by about 25 degrees for a short time as this gives the tires time to reach their correct shape. The ignition system limits the engine speed to 8400 rpm. The ignition system provides initial 60,000 volts and 1.2 amperes. The long duration spark (up to 26 degrees) provides energy of 950
millijoules (0.23 calth). The plugs are placed in such a way that they are cooled by the incoming charge. The ignition system is not allowed to respond to real time information (no computer-based spark lead adjustments), so instead a timer-based retard system is used.
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