Ignition advancer wanted

Hi guys I'm after a cheap ignition advancer for my track day bike. Any body got any ideas ? 4 degrees of advance is the way to go I here.

Or I was thinking I could just rotate the ignition trigger and weld it back up turned 4 degress to the left ?! any body ever done this ?

Thanks in advance.

or just slot mount holes for pick up.

[yorkie_chris]

Originally Posted by zadar

or just slot mount holes for pick up.

+1

aha ! That's a good idea. Are the holes on the back plate ? I've never had the sv to bits. I fitted one to an old gpz.

yes,there are 2 holes and pick up is bolted to engine cover.if you carefully slot them you can move pick up 3-4 degree to advance or retard.

[embee]

I got 2deg by slotting the holes on my SK1, you might be able to squeeze a touch more with some determination. Very noticeable effect when pulling away from standstill on a 'normal' start.

[TSM]

thats what i did, but ive also used the key, so a fair bit more than 4deg, its a wheelie machine now out of corners, a bit too much i think somtimes, just waiting for the crank to say goodbye

showed itself off yesterday, when the bike did an almighty bang at 9k as i was at WOT, i swear i saw a flash, bike stuttered and then just kept going on, never happened before that much

[embee]

Be aware that you can go too far advanced, from what I recall I think about 4deg extra is near optimum for a carb SV650 [JHS info??]. This comes back to it being calibrated on 91RON.

Without seeing dyno curves overlaid I would be a bit wary of overdoing it. Basically if at any given RPM you don't see any gain in torque with increased advance, then it's at the optimum. It's normal practice to set the ignition at typically "MBT-1" (i.e. ignition for maximum brake torque minus one degree) where it can be optimised, and "borderline knock minus one" (BLK-1) where knock limited.

Plug temps and peak cylinder pressures rise quite dramatically with ignition advance, plugs gain typically 10-15 degC per degree of advance, depending on the engine. Anything more than a degree or 2 and you really should go one grade colder on the plug to be safe. Over-advance will heavily load con-rod bearings and puts a lot of heat into the pistons.

[TSM]

Originally Posted by embee

Be aware that you can go too far advanced, from what I recall I think about 4deg extra is near optimum for a carb SV650 [JHS info??]. This comes back to it being calibrated on 91RON.

Without seeing dyno curves overlaid I would be a bit wary of overdoing it. Basically if at any given RPM you don't see any gain in torque with increased advance, then it's at the optimum. It's normal practice to set the ignition at typically "MBT-1" (i.e. ignition for maximum brake torque minus one degree) where it can be optimised, and "borderline knock minus one" (BLK-1) where knock limited.

Plug temps and peak cylinder pressures rise quite dramatically with ignition advance, plugs gain typically 10-15 degC per degree of advance, depending on the engine. Anything more than a degree or 2 and you really should go one grade colder on the plug to be safe. Over-advance will heavily load con-rod bearings and puts a lot of heat into the pistons.

well, this may all be true, but my bike has survived two trackdays (silverstone & brands), many rideouts, daily commutes etc, no easy going in the morning, not shown a problem so far. I run iridium plugs and they have not had any problems, i run shorter oil changes too. If it pops soon i dont mind too much as its realy my toy. I dont recomend everyone doing what ive done though as the odds are someone will have a weaker bike and brake it.

I mean to do a dyno on it, but want to take it and be done properly.

I did bunch of dyno runs on stock curvy and found nothing noticeable.went back to stock.