Show Posts
16
Tech Forum / CDI ignition
« on: 30 Sep 22, 11:42 am »
Morning all, and here I go again experimenting.
This is a winter project for me on the engine.
The aim is to widen the power band of the engine by having self advancing timing as the revs build, Like most motor vehicles.
Peak power should not be effected as our engines are designed stock to only produce peak power at about 3500 revs.
Quite a few people add 40 of advance by filing the key. I have not. Doing this shifts the peak power up the rev range.
with a 7:1 gearing plus TAV overdrive at 1:1, 6000 revs would give approximately 60mph!!! on a 17" wheel + tyre so our rev range for power is probably best low down, and ideally over as wide a band as possible. If I were a Kart with small wheels, filing the key would be a great advantage where I needed it as the gearing is lower. As we state 35mph as an aim for the CycleKarts, having a wide band of power around 3500 revs should be the aim.
I have come across a fellow in Canada who is producing basic CDI kits for our engines and persuaded him to ship me one.
If it works it should put less stress on the engine, have a better fuel economy, a wider power band, wider torque band and be easy to start.
These things are quite new and the fellow is a small business trying to establish a market. It is an experiment and I may go back to stock if it doesn't work out. If I were you and you were thinking of giving it a go, I would let me spend the small amount of cash on it first and see how it works out.
Thoughts please
https://www.youtube.com/watch?v=NNaAdmFazp4
This is a winter project for me on the engine.
The aim is to widen the power band of the engine by having self advancing timing as the revs build, Like most motor vehicles.
Peak power should not be effected as our engines are designed stock to only produce peak power at about 3500 revs.
Quite a few people add 40 of advance by filing the key. I have not. Doing this shifts the peak power up the rev range.
with a 7:1 gearing plus TAV overdrive at 1:1, 6000 revs would give approximately 60mph!!! on a 17" wheel + tyre so our rev range for power is probably best low down, and ideally over as wide a band as possible. If I were a Kart with small wheels, filing the key would be a great advantage where I needed it as the gearing is lower. As we state 35mph as an aim for the CycleKarts, having a wide band of power around 3500 revs should be the aim.
I have come across a fellow in Canada who is producing basic CDI kits for our engines and persuaded him to ship me one.
If it works it should put less stress on the engine, have a better fuel economy, a wider power band, wider torque band and be easy to start.
These things are quite new and the fellow is a small business trying to establish a market. It is an experiment and I may go back to stock if it doesn't work out. If I were you and you were thinking of giving it a go, I would let me spend the small amount of cash on it first and see how it works out.
Thoughts please
https://www.youtube.com/watch?v=NNaAdmFazp4
