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Why Install An Inner Rotor Ignition?

by Brad Speed / Wednesday, 03 November 2021 / Published in Scooter Tuning

In the above video we discuss in a fair bit of detail what the purpose and advantage of an inner rotor is, and when you might consider installing one – Really worth a watch, even if just to improve your understanding of how your scooter ignition works.

To summarize, the stator in your scooter (similar to an alternator in a car) uses the rotation of the engine to generate electricity which it uses for various purposes on the bike. A factory stator has a number of coils, each of which perform a specific function (e.g. Spark for the spark plug, charge for the battery, power for the headlights, ect).

The principle of charge generation revolves around a magnet, passing over a coil. Each time the coil and the magnet interact, they generate electricity – as the engine revs and the magnet and coil interact at a higher rate the voltage increases (this is why the charge rate increases as the engine revs).

An inner rotor ignition uses this same principle, however it functions in the reverse to the factory stator. The factory system is based around a flywheel with a magnetic ring around it, which rotates around the stator (coil) to generate power.

For the engine to rapidly rev, it needs to be able to do so with as little drag as possible. The weight of the factory flywheel creates significant inertial drag on the crank as it tries to rapidly increase in RPM. This drag is compounded by the build up of centrifugal force, as the weighted component of the flywheel is relatively far away from the centre of the crank.

An inner rotor solves this problem by lightening the flywheel significantly, and placing it inside the coil component. This drastically reduces the drag, and centrifugal force build by placing a smaller amount of weight, much closer to the centre of the crankshaft – meaning the engine can increase in RPM far more rapidly.

An accurate analogy would be the difference between trying to run while dragging a 20kg bag of sand tied to a rope around your waste, or running without.

Because centrifugal force builds up exponentially as the engine revs, high revving engines experience far worse affects compared to lower revving engines. For this reason, we generally recommend installing an inner rotor ignition on scooters with racing cylinder kits – where the most benefit will be experienced (as these are not a cheap part).

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Polini ECM applications:
VESPA – VESPA 50 4T PRIMAVERA 3V E5
VESPA – VESPA 50 4T SPRINT 3V E5
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@scooterstreetau

scooterstreetau

The key to the Euro 5 Piaggio / Vespa 3V 4T E5 eng The key to the Euro 5 Piaggio / Vespa 3V 4T E5 engine unlocking. Polini ECM for Vespa 50 4T PRIMAVERA and SPRINT 3V E5
PIAGGIO – LIBERTY 50 4T 3V ie E5. 🛵🛵🛵🛵🛵🛵🛵🛵🛵🛵🛵🛵🛵 For all the lovers of the most famous scooter in the world Polini presents the new ECM “ENGINE CONTROL MODULE” for Piaggio 50 4stroke Euro 5. Polini electronic ignition that controls the engines. It includes the sensors, the actuators, fuel injection, ignition and engine auxiliar components. ECM lets the performance of your vehicle increase through the use of a microprocessor of the latest generation, in synergy with an hardware designed for this engine. It’s a plug&play CDI. Very easy and fast to install, it is enough to match it with the Polini Hi-Speed variator. If you require for the power increase of your scooter with the Polini engine kit it is possible to update the ECM though the device supplied and select the maps you desire.
Polini ECM applications:
VESPA – VESPA 50 4T PRIMAVERA 3V E5
VESPA – VESPA 50 4T SPRINT 3V E5
PIAGGIO – LIBERTY 50 4T 3V ie E5
Malossi Cylinder Kit 124cc cast iron. D = 57.5mm. Malossi Cylinder Kit 124cc cast iron. D = 57.5mm. For Yamaha 100cc 2-stroke.
What is the time? #yamaha #time Aerox and BWS both What is the time? #yamaha #time Aerox and BWS both 100cc 2T in for refreshing.
Gotta be one of the hottest 🔥 mods you can fit Gotta be one of the hottest 🔥 mods you can fit to your engine. Malossi Airforce Trans Cover with Red Filter. Check it out🔥🌋☀️#malossi #airforce #airfilter #malossired #scootertuning #transmission #variator #clutch #red #scooterrider
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What #bike does this cylinder fit? #make and #mode What #bike does this cylinder fit? #make and #model Hints: #2stroke #scooter #80s #hello #?
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