Accel Launching The First Ever Coil-On-Plug Ignition Conversion

ACCEL11ACCEL2ACCEL3Accel is launching the Stealth Supercoils that you mount to the spark plugs,  eliminating the bulky external coil and the need for spark plug wires while delivering up to 20-percent more voltage than stock ignition.  This patent pending ignition coil is a very interesting new part for Harley-Davidson® Twin-Cam owners looking to improve the look and performance of their bikes.

The ACCEL Stealth SuperCoils hide all ignition wiring in the head of the coil pack eliminating the need for ugly spark plug wires and provide quicker engine starting and improved throttle response while offering a clean, custom look. Available in either black or natural finishes, the Stealth SuperCoils mount directly to the spark plug and feature a cross functional aluminum cast cover that acts as a heat sink, pulling heat away from the cylinder heads.

“We’ve taken proven automotive technology and adopted it to the Harley-Davidson Twin-Cam engine, bringing to  market a product that seamlessly combines a hot new look with the unmatched ignition performance that ACCEL is known for,” said Jason Ellison, Product and Sales Manager for the ACCEL Powersports division. “The increase in performance I’ve experienced first-hand during test rides is impressive and we’re incredibly excited to introduce this innovative product.”

ACCEL’s new coil system requires no cutting or splicing of the factory wiring harness. Thanks to high quality Delphi connectors, installation is a simple plug and play affair. The coil itself boasts a faster rise time and higher voltage than the traditional system, meaning the plugs receive maximum spark energy and perform even better. As with all ACCEL SuperCoils, the Stealth SuperCoils are covered by ACCEL’s famous limited lifetime warranty. ACCEL Stealth SuperCoils fit all fuel-injected Harley-Davidson Softail and Touring models from 1999-2013 and are available in both “natural” cast aluminum and black finishes. Additional applications are currently in development and testing for 2014. More information at Accel Motorcycle.  or Prestolite Performance.

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17 Responses to “Accel Launching The First Ever Coil-On-Plug Ignition Conversion”


  1. 1 Dar @ Brass Balls Cycles Sep 28th, 2013 at 9:25 am

    Love to see performance upgrades that make sense and maintain a clean design. What are the applications for S&S motors. I’d link to try this on our bikes.

  2. 2 Sharkey Sep 28th, 2013 at 10:23 am

    I have no doubt these will work well, but I see them as more cosmetic than performance enhancing…how do you quantify “faster starting” and “quicker response”?

  3. 3 LoneRider Sep 28th, 2013 at 11:45 am

    Great Idea, suprised it took this long to get to V-Twins. Less spark scatter, less voltage loss, hopefully it will be compatable with all years that have electronic ignition. Wonder the price Cyril did Accel not have that at press time? Hopefully it it priced more resonably than say stuff from the company.

  4. 4 timmoking Sep 28th, 2013 at 3:25 pm

    Dealer is gonna love charging the extra unit of time at service! This product looks good for custom use, but as a daily rider, the simplicity of popping the wire off the plug appeals to me more.

  5. 5 winterman Sep 28th, 2013 at 5:41 pm

    more bling to keep the money coming to the myth.

  6. 6 richard Sep 28th, 2013 at 6:18 pm

    Can the performance improvements be quantified in practical terms? Better gas mileage, more HP/torque? Will I notice any difference what so ever? Coils, spark plug wires seem to work well…they efficiently light off the fuel/air charge from idle to red line. Also, I do not think plug wires are “ugly”.

  7. 7 timmoking Sep 29th, 2013 at 3:37 am

    And yeah Richard, I agree- Plug wires are not ugly and are an integral part of the “mechanicalness”

  8. 8 Zipper Sep 29th, 2013 at 3:27 pm

    What A revolting development this is. ..Z

  9. 9 Mack Sep 29th, 2013 at 5:35 pm

    If price right is right ….I think it they will sell a boat load

  10. 10 Scott Sep 30th, 2013 at 6:56 am

    Or you could just hide the coil under the seat? Oh wait, that’s too complicated for the bolt-on crowd.

  11. 11 Wilhelm Sep 30th, 2013 at 8:48 am

    What is a sound idea on cars (no distributor, cheaper to make) doesn’t have to be so brilliant on a bike. Whats’s the idea in replacing a nice looking spark plug wire with an ugly blob of plastic? But wtf, haven’t we all ripped apart perfectly well running hogs to “improve” on Mother Milwaukee?

  12. 12 Lyle Landstrom Sep 30th, 2013 at 9:56 am

    So how’s the coil going to work after repeatedly heating up and cooling down on those hot heads? I’ll stick to the good ol’ reliable system and keep my coil as cool as possible in the stock location.

  13. 13 Terence Tory Sep 30th, 2013 at 10:16 am

    Lyle Landstrom,the smaller coil on the head would probably run essentially cooler than a normal one.They don’t not need to induce such a strong charge to travel all the way up the plug lead.Plenty of air near the small coil to keep cool.When have you ever touched a plug cap and its hot?,Like never.

  14. 14 Lyle Landstrom Sep 30th, 2013 at 11:08 am

    TT, you do have a point because of the ceramic insulator in the plug. Time will tell. LL

  15. 15 A 1 MIKE Sep 30th, 2013 at 12:52 pm

    glad to see the Harley aftermarket is making their way into the nineties! lol

  16. 16 Lee Sep 30th, 2013 at 3:16 pm

    Jason was across the aisle at the TR/Bikers Choice dealer event and let me have a look. Excellent idea and very nice quality, not plastic. One of those “Coulda had a V-8″ moments, seems a natural for HD. Good luck!

  17. 17 ROBERT CONLEY Dec 7th, 2013 at 1:47 pm

    I HAVE PERSONALLY TRIED EVERY “HOT” COILS AND EVERY TYPE IGNITION, AND STILL HAVEN’T FOUND ANYTHING , INCLUDING “SINGLE FIRE ” “DUAL FIRE’ OTHER THAN ABOUT A HALF HORSEPOWER GAIN AND A SLIGHT LESS VIBRATION. STILL, HAVEN’T SEEN ANY MAJOR CHANGE. SPARK IS SPARK, END OF STORY. INCIDENTLEY, WHAT’S THE PRICE OF THIS NEW BRAINSTORM? I HAVE WATCHED PERSONALLY THE TESTING THAT HARLEY DOES AT YORK,PA. IF ANYTHING WORKS BETTER THEY’LL FIND IT BELIEVE ME.
    ALSO, I WOULD LIKE TO MENTION A CV CARB. THAT EVERYBODY SEEMS TO WANT TO DICARD, BIG MISTAKE. HARLEY TESTED CARBS ALL OVER THE WORLD IN CONDITIONS THAT WOULD MAKE YOU CRY. GUESS WHAT PERFORMED BEST UNDER EVERY CONDITION AND ALTITUDE? KLEHIN CV CARB. SO, BACK TO THE ADAGE “IF IT AINT BROKE DON’T FIX IT.
    48 YRS ON A HARLEY
    BOB CONLEY
    robertconley009@gmail.com
    . ps; ALSO, HAVE TRIED EVERY SCOOTER OUT THERE, HARLEY WITHOUT A DOUBT DOES MORE R&D THAN ANY OTHER MANUFACTURER.

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