Pictures of Maney ign installed

acotrel said:

One of my mates fitted the ignition system from a VT750 Honda to his 750SS Ducati. The crank-mounted trigger gave him difficulties. He was a motor mechanic, so had the engine analyser. He got it to advance properly. It improved the Ducati. He used the trigger from a Bosch distributor.- Hall Effect ?

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baz said:

That's a great help!?

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acadian said:

off topic, are you running a total loss system? I've been revisiting the idea of the Electrixworld kit

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Fast Eddie said:

What did you replace it with Steve.

And what do you think to the claim of increased performance due to the increased accuracy of crank mounted ?

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SteveA said:

I didn't get to do much more than run the motor in before it failed. Fundamentally, I believe that Steve did get an improvement that was worthwhile at the level he was riding at. With a Seeley he probably had more space inside the fairing than I did on the Rickman, or I reckon he would have done more to cut the thing down. Norman Whites' pick ups are much tidier. And so are the home brew ones I have seen that attach to the crankcases using a trigger as part of the inner side of the pulley. If I was going to bother with crank triggering again, I would want that type of solution, probably with an Ignitech box. But.....

When it broke I just changed the pickup to a standard Boyer twin coil plate in the cam driven location. You can definitely see the strobe light moving around more due to the cam chain flex now in the loop. I can 'believe' that the better triggering accuracy adds a couple of HP, but when riding it doesn't seem much different.

And it ran fine, for at least a season, until Boyer pick up plates did what Boyer pick up plates do. Crappy crimp style electrical connections get annoying.

I also sat and figured that running half the intended advance curve might have some limitations.

So I changed the box and plate for a basic Pazon Surefire system, which I think of as the same thing as a Boyer, but better made using more recent electronic components. It has been reliable, but I have a spare box in the tool box. I have had to nip up the pickup wire screw in connections a couple of times. But once you know you need to do that after initial fit, and maybe check once in a while, it's fine.

No dramatic change. But the advance curve isn't a big issue on a race bike that spends more than 95% of it's time fully advanced! It may start better, but on rollers, not a big issue. I might worry more if I had to kick it. With a lower revving 1007 I still don't think the advance curve is going to make much difference, or that the lack of 2 HP max is going to show much.

I ran my 850 motor at full advance in the '70s, it works, and Thruxton did it. Fixed advance removes a variable.

I'm sure if you spent enough time on a dyno you would convince yourself you needed both crank triggered ignition and a bespoke curve on a programmable ignition. Or, just ride it! I have decided that as a 70 year old who may not get to ride much in future, this isn't the time for me to be worrying about fancy ignitions.

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Fast Eddie said:

Good info, thanks.

Actually, my previous dyno experiments have led me to conclude that a few degrees either side of nominal is barely detectable on these old lumps. Similarly, I’ve run very happily with fixed advance before. Even having said that, I do like the idea of a very accurate ign, and a BIG spark.

So I think my idea of the ideal ignition is a self contained chargeable Interspan style, crank triggered with a fixed advance.

I’m not aware of such a thing though !

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SteveA said:

Well Interspan has sort of dropped out of the market, so your options include developing something!

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Chris said:

Martin will make an Interspan to whatever spec we want. As long as we can supply the basic box to start. Luckily I have spares.

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