Is it worth the money? Some say it doesn't do much of anything other than upgrading the system and others say it stops a lot of the viberation in the solid mount EVO's

 

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- hi ,

- would like to know about the vibration thing too.

thanks.

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I put a Daytona Twin-Tec single fire on my 92 Heritage, I think that it starts easier, and runs smoother, In my opinion....

 

Thanks, I know they don't knock out all of the vibs but maybe smooth them out a little. I don't have any trouble starting but once I change it out I could be surprised. I have a 93 Fatboy that I bought used and I am pretty sure that is has never been changed out other spark plug wires that I just put on.

 

I just purchased a Dyna single/dual fire module for my FXR. That way I can go either way as my new Screamin Eagle coil and wires are compatible with the Dyna system. I also purchased the Dyna single fire coil that is compatible with the SE wires as well.

My understanding is that with single fire you have more spark energy. In addition you can also retard the rear cylinder slightly in a higher compression engine. I'm thinking about going that route as my engine withe the SE heads installed will be 10.5 to 1.

I also have a NIB Dyna 2000 dual fire module at a great price. It is also compatible with the stock Harley or SE coil and wires. It has a 7 pin connector for an earlier model Evo. If you have a later module with a higher pin count, you'll need to purchase the adaptor cable from Dyna. If decide to go single fire I'll also have an almost new (200) mile SE coil and wire set. The wire set however, will only fit a center mounted coil like an FXR. You can e-mail or PM me if anyone is interested. Trust me, the price will be right!

 

Thanks for the offer Buddy but if I decide to go with single fire, I will change everything. My module is a 7 pin and at the moment I am running a SE module on it. Not bad but keep hearing more about the single fire and it would make since.

 

Have a Dyna 2000i in my Ultra. Can't say I felt much difference at low speeds, but at highway crusin yes, a noticable reduction in vibration. I would think there is an improvement in power also, since the pistons are no longer fighting one anotherto a small degree. Installed during other work so I can't give you much more than that.

 

With the stock set up, dual fire, that just means the plugs fire on the intake and exhaust stroke right?? By changing to single fire (firing on intake compression stroke only) how'sthat going to eliminate any vibration. If anything it may keep the plugs from wearing out sooner. Doesn't sound like it's worth the bother. What I've wanted to know for years is why MOCO used dual fire coils in the first place.

 

I single fire both my strokers with a 96 ss motor I try to eliminate as much vibration as possible I really don't think there is much of a diff between dual fire and single fire It looks cool with 2 coils

 

Back in the days of points ignition both plugs fired at the same time due to only one set of points for both cylinders. The aftermarket came along with "single-fire" ignition and the factory eventually caught up.......believe it or not, the single fire does smooth the engine out some probably because any unburned fuel doesn't get burned during the exhaust stroke.