ESE's works engine tuner

[F5 Dave]

Attachment 280192 Attachment 280194

I made up a spacer for a 3/4 inch BR10EG resistor plug along the lines suggested by Wob.

Actually Wob told you to weld it on & he did so for a good reason. You've just made a BR7EG emulator.

[TZ350]

You've just made a BR7EG emulator.

...... .... bugger

[wax]

Wob/ frtiz anyone
Have you guys compared wasted spark to a non wasted spark on an engine and what was the result as far as power was concerned

[F5 Dave]

Well I'll chime in under the anyone clause & say a lot of it would depend on the ability of the ign to generate enough juice at high revs.

I do know a chap that had a bunch of issues on a dirty old aircooled bigbore MXr running on Methanol & problems disappeared when they went to a non wasted spark ign. perhaps Meth was igniting, or perhaps see first paragraph.

[wax]

Well I'll chime in under the anyone clause & say a lot of it would depend on the ability of the ign to generate enough juice at high revs.

I do know a chap that had a bunch of issues on a dirty old aircooled bigbore MXr running on Methanol & problems disappeared when they went to a non wasted spark ign. perhaps Meth was igniting, or perhaps see first paragraph.

Yes thats right, Im making a custom flywheel for an msd 4217 ignition for my race bike. Im just wondering one lump or two. Its easy to do one lump but if there were getting a gain with a wasted spark then I will look at making it a two lump flywheel. the other advantage of a two lump flywheel is I can use a spare pickup in case one goes wrong I can simply switch to the other pickup, its an endurace engine

[2T Institute]

Look under the bonnet of any reasonably modern car and do you see individual coils or a single coil?

[wax]

Look under the bonnet of any reasonably modern car and do you see individual coils or a single coil?

I see one coil per cylinder, that doesnt mean they are wasted spark. If you see half the number of coils vesrus cylinder you can be reasaonably sure they are wasted spark. Im not sure if wasted spark made more power on the dyno on a two stroke than a single spark. im not asking about using a distributor ie the single coil.

[F5 Dave]

I can't imagine how they would make more power & in fact give less time to build up charge.

How often to pick up coils go duff? Have to be pretty unlucky & then pretty lucky to work it out & swap it over in time.

[wax]

180 degrees is a fair amount of dwell time. I agree pickups dont give grief often but its a 24 hour race and I just want to have all my bases covered. I was wondering if a wasted sprk system clears the plug better and is less prone to fouling. I mean I didnt think the rsa cylinder with its big square entry to the transfers would make more power. The more you play with these engines the more you realise how finicky they are and even the smallest things make the big difference. I was just hoping to hear from some one who had in fact run it up on a dyno and done the test

[wax]

My ignition system has a full redundant system built into it ready to go. you can just plug it in. 24 hours at 14000 rpm really tests stuff and prior preperation prevent piss poor performance.

Its the stuff you dont do that lets you down

[TZ350]

KX80 single spark per revolution.



KX80 Wasted spark ignition.

Some of our bikes have a wasted spark ignition but we never thought to go to the trouble of trying the ignitions in back to back tests on the dyno.

[wax]

KX80 single spark per revolution.



KX80 Wasted spark ignition.

Some of our bikes have a wasted spark ignition but we never thought to go to the trouble of trying them in back to back tests on the dyno.

Thanks tz Im not sure it will make or not make a difference but it would be worth finding out if its been tested as right now I have the ability to choose

[Flettner]

What do you mean, wasted spark?

[wax]

Wasted spark on a two stroke is when it fires at bdc as well as tdc. Normally its done on a twin cylinder two stroke where they use a single channel ignition system to run both cylinder. On a four stroke its a bit different

[TZ350]

KX80 single spark per revolution.



KX80 Wasted spark ignition.

What do you mean, wasted spark?

Both KX80 flywheels have four poles.

With the first KX80 ignition, both pole pairs charge up the CDI capacitor and the outside trigger coil fires it.

For the second KX80 ignition, both pole pairs charge the CDI capacitor (one pair at a time) and the ignition is triggered by the flux sign change as the magnet pair pass the coil, this happens twice a revolution, so one spark is wasted.

Wax has pointed out some other wasted spark scenarios.