aliveagain
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posted February 28, 2009 11:24 AM
coil speed?
Whats the highest rpm that the 12's coils can handle?Curious what the life span is also to see if they maybe getting weak with age.All are within limits but that doesn't mean the insulation isn't breaking down from heat.
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whitehendrix
Zone Head
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posted February 28, 2009 08:49 PM
they should theoretically be able to take 15-20+Krpm depending on the flux collapse rate, which is exponential and damn-near instantaneous. they all pretty much have the same flux decay rate. somewhere i wanna say in the very low milliseconds if not microseconds.
not sure on the life span of the 12-R's coils.. i've seen some last for years, some for months.
look for dark spots on the bakelite and pitting in the rubber.. you'll hear voltage leak to ground as well. should do it at any temp if it is going to do it.
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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aliveagain
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posted March 01, 2009 04:30 AM
Thanks! Never knew about coils and whether the spark voltage would drop after 9 years now.If I ever decided to have the motor spin faster(say maybe to break into a new class),does the coil/spark plug have the same strength now as it did nine years ago?Would it be something to look at if I had a power drop of a few ponies?
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I wondered why the baseball kept getting bigger. Then it hit me.
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whitehendrix
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posted March 01, 2009 07:26 PM
about the only thing that gets weak is the insulation, but really, if they haven't broken down to the point of missing, i would go ahead and use them unless you're really concerned and just wanna set them aside as spares.
the properties of the coil itself (inductance mainly) won't change practically forever.
some ppl say about the O2 content in the wire hen it's drawn and that it'll affect the inductance/resistivity values, but i'm not so sure that holds too much water.. maybe uncoated wire in free air, but the coil wire is enamel coated and sealed on it's bobbin in epoxy
you can always go for new coils and keep the stock ones as spares.. it can't hurt.. as well, i'm sure theres companies that make a slightly higher output coil as well.. about the only thing i think would affect the coils ability to function at high speeds is the ECU parameters like dwell and the cyclic rate the power goes thru the coil at..
thing is, no coil from one to the next is ever the same. thus the reason they outline a tolerance for it to fall in in the manual.. like for most kawi trigger coils, they call (i think) 440-480 ohms and EVERY single one i've ever tested came in at 460 almost on the money. but that doesn't mean i would rule out one that came in at 439.26 or 465 ohms.. it's kind of a good judgement call.
the best thing ever invented was a megger.. sadly, they're expensive and kinda hard to find it seems.
they're specifically made to test insulation at a high voltage (most at 500V, some at 1KV and a few others at 5KV) and will tell ya if you're going to have a problem with a component or wiring. next to that, a good quality DMM like a fluke or simpson ill be your best friend in tracking degradation of coils thru the race season..
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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aliveagain
Needs a life
Posts: 5033
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posted March 02, 2009 05:09 AM
cool,thanx
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I wondered why the baseball kept getting bigger. Then it hit me.
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2000redrocket
Pro
Posts: 1662
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posted March 02, 2009 08:30 PM
yep 500 to 1000v will show brakedown in insulation. at work i use a wiggens tester and go from one leg of 480 (which it 277 to ground) to motorwindings to look for grounds and sofar if the wiggens light for the coil goes on the megger will say it is junk.
to gain output we can increase the input. msd boxes give in the realm of 400vdc to the primary side of the coil. what do you guys think if we make a seperat circuit with big dc volts for the plus side of the coils. think the ecu will like it? it is a windings ratio after all. just going 24 vdc will step up the output.
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whitehendrix
Zone Head
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posted March 03, 2009 11:32 PM
crank meggers are the shit.
i used them when i was an electrical engineer at a block plant remotely testing belt and mixer motors.
also used them in a paper mill i was a fabricator and mechanic at..( and unofficially did electrical work) theres was probably several hundred motors there.. most of them on VFD or vector drives and all at 480V and 98% of them in a wet environmnent.
used some kinda pushbutton unit there with a fixed 500CVD output and leds for the resistance scale. real simple and nice.
a megger in industry is yor best friend.
bikes? rarely used, but still invaluable when you need one.
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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