500whp, Direct Ignition vs Wastespark
one benefit of waste spark is it guarantees no variance in timing between the 2 chambers. it does have negatives but they're not quite as bad as implied here.
direct ignition does have a few more benefits, one of which is not scavenging the unburnt fuel so that it can cool the chambers slightly more before the next ignition event.
i've run all types of setups and never noticed any huge drawbacks to either setup, including rather high horsepower street cars running waste spark on stock coils for many many years without any unexplained failures.
700+whp isn't quite in that ballpark though, i wouldn't be using stock coils even with an amp with waste spark for that sort of power and expect good results. going that far requires slightly more extreme measures for reliability. the difference between 500whp and 700whp is the difference though, 500 does not require those extreme measures and many people have done just fine by the examples listed above simply with an ignition amp.
direct ignition does have a few more benefits, one of which is not scavenging the unburnt fuel so that it can cool the chambers slightly more before the next ignition event.
i've run all types of setups and never noticed any huge drawbacks to either setup, including rather high horsepower street cars running waste spark on stock coils for many many years without any unexplained failures.
700+whp isn't quite in that ballpark though, i wouldn't be using stock coils even with an amp with waste spark for that sort of power and expect good results. going that far requires slightly more extreme measures for reliability. the difference between 500whp and 700whp is the difference though, 500 does not require those extreme measures and many people have done just fine by the examples listed above simply with an ignition amp.
Last edited by RotaryEvolution; Jul 25, 2013 at 11:05 AM.
Rotary Enthusiast
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From: Melbourne FL/San Antonio TX/Okinawa Japan
If I am reading things correctly, I don't think he means stock coils, but stock coils on a wasted spark setup; wasted spark being the key argument. His point is not that high hp cant be achieved on wasted spark, but its not the "smartest way of doing it"
I think thats his argument
I think thats his argument
chuck
Rotary Enthusiast
Joined: Aug 2006
Posts: 1,216
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From: Melbourne FL/San Antonio TX/Okinawa Japan
Isn't teh factory twin coil, effectively two coils (or a single large coil with twin posts tapped at the same winding?) running in parrallel from a single ignitoer, not in series back to each other?
So both coil posts are the same polarity earthing to the block via the plug gap, not a closed loop from one post, through one lead, across the housing/centre plate/housing and back through the other plug to the other leading post? Sounds like a retarded setup to me, I don't believe one fouled leading plug (or an ignition wire falling off) will kill the other rotor? I think you are a bit mixed up bud.
So both coil posts are the same polarity earthing to the block via the plug gap, not a closed loop from one post, through one lead, across the housing/centre plate/housing and back through the other plug to the other leading post? Sounds like a retarded setup to me, I don't believe one fouled leading plug (or an ignition wire falling off) will kill the other rotor? I think you are a bit mixed up bud.
about how the leading coil works
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