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Post by karl on Mar 2, 2014 10:04:05 GMT -5
Can any one give me the striaght scoop in these performance cdi's. I have read they advance the timing, but I don't see how that is possible. Or they say they make the plug fire earlier. I can see how they take the rev restriction out. The reason I ask is I put one on my gy6 70cc chain driven motor. It knocked out the revlimiter good! But I am still keeping it between 6k and 7k. My plug is a nice gray ash color. I had to adjust my fuel mix to run richer to get the idle down. Any ideas? I would hate to ruin this motor. Thanks, |
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Post by tvnacman on Mar 2, 2014 15:10:54 GMT -5
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Post by tvnacman on Mar 2, 2014 15:11:31 GMT -5
Cut and paste the entire link . |
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Post by millsc on Mar 2, 2014 15:22:44 GMT -5
In my opinion the performance cdis don't do a whole bunch its more of a " I know its not restricted" type of deal, more for peace of mind.
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Post by karl on Mar 4, 2014 8:34:05 GMT -5
Yep, the one I got "blue" took away the restriction. It adds a little more to the throttle but makes it idle a little rougher. I may try a programmable one. I always thought that if one advances the timing you risk burning valves? My power is good, I just don't like it when I feel the restriction kicking in and the loss of power.
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Post by tvnacman on Mar 4, 2014 12:56:31 GMT -5
Karl I only sell what I use or get positive feed back from . I hsve dold many everyone has been happy . It will give you non laboring cranking and no kick backs from high compression .
John
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Post by JerryScript on Mar 4, 2014 13:49:45 GMT -5
I purchased one of tvnacman's advancing angle CDIs on alleyoop's advice, and it did make a difference in starting. It eliminated kick back I was dealing with, and gives great performance at all speeds.
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Post by karl on Mar 5, 2014 21:38:59 GMT -5
Cool John, What I am looking for is a cdi that does not have the rev restriction and does not mess with the timing, 5 pin AC gy6, 50 cc or 70 cc.......
Thanks
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Post by larrball on Mar 6, 2014 23:02:26 GMT -5
Karl, i have the CDI john has on his web site. Go to Reply #18 |
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Post by rockynv on Mar 7, 2014 0:50:12 GMT -5
I think it would be better stated that the performance CDI does not retard the timing as much as a stock CDI. The GY6 flywheel is set to an advanced position and the CDI then retards the ignition to match its programming curve. In a mechanical distributor their are conterweights and a vacume pot to retard the timing and then depending on load and rpm allow it to go out to the most advanced position. In a GY6 this is all handled electronically with the stock CDI being more restictive on how close it will go to 0 degrees retarded from full advance. To get beyond that they have an offset flywheel key.
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Post by tvnacman on Mar 7, 2014 12:06:58 GMT -5
I think it would be better stated that the performance CDI does not retard the timing as much as a stock CDI. The GY6 flywheel is set to an advanced position and the CDI then retards the ignition to match its programming curve. In a mechanical distributor their are conterweights and a vacume pot to retard the timing and then depending on load and rpm allow it to go out to the most advanced position. In a GY6 this is all handled electronically with the stock CDI being more restictive on how close it will go to 0 degrees retarded from full advance. To get beyond that they have an offset flywheel key. Did you look at the video ? John |
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Post by alleyoop on Mar 7, 2014 17:06:14 GMT -5
That is backwards a Performance CDI Advances the timing not retard it(which means the plug fires early before the piston comes up to TDC) that is why you will see your idle go up it is firing in a shorter period of time(faster). Retarding the timing is allowing the piston to reach TDC or just before and then fire the plug. Now in reality you get a lot more power if you fire the plug JUST past TDC just a hair past when the Crank is on its way down but that puts a lot of strain on the crank and bearings. Advance means early Retard means later many read it as meaning the other way around.
Alleyoop
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Post by karl on Mar 7, 2014 23:19:26 GMT -5
Thanks for all the ideas and suggestions. Once I get this thing broke in I may switch over to one of Johns CDI's. I am kind of in no mans land here. I have a 70cc gy6, chain drive, AC moped, 4 stroke. Not really a scooter, not really a true moped and kind off like a motorcycle. But the thing runs great and I am getting about 100 mpg and it cruises at 40mph with half a throttle left. So I am still in the learning curve.
Karl
PS You should have seen the double take I got from a guy riding a Harley when he saw me give it a couple of peddles of the line at the light, to funny!!!
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Post by tvnacman on Mar 8, 2014 10:03:21 GMT -5
Karl , just another idea here you have the plug on the cdi you have . Remove the pins and switch the plug . then you can use the variable timing cdi .
John
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Post by karl on Mar 8, 2014 13:59:17 GMT -5
John, thanks I was thinking of that, make a pig tail for the six pin.
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..BAD TO THE BONE..