1. After 20+ years it's time to pass the torch. If you are interested in acquiring this forum please contact support@cv-performance.com for details. Any spam will be reported and blocked.
  2. Welcome to Bike Talk, a forum for all bikers and motorcycle enthusiasts. If you are new to Bike Talk, be sure to register for free and join the conversation.

    There's always someone around willing to help out with questions or give a friendly wave back. All Harley and metric riders are welcome.
Bike Talk Motorcycle Forum is For Sale Welcome to Bike Talk

Duel Plug vs Single Plug

Discussion in 'Motorcycle Tech Talk' started by JohnnyBiker, Jan 18, 2011.

Page 3 of 3
  1. Lucifer

    Lucifer Well-Known Member

    Joined:
    Mar 20, 2008
    Messages:
    3,861
    Likes Received:
    102
    Location:
    Cape Breton NS,Canada
    Dual plug heads were used mainly on high compression shovels because the pistons were so far up in the combustion chamber they would shroud the fuel mix from the spark on the opposite side of the piston dome...putting a spark plug on both sides of the piston dome helped give a better more complete burn of the fuel mix....here a look at a set of 8.5:1 wiseco's so you can see the "pop-up" 9.5"1 or 10.5:1 have even higher domes
    http://www.wiseco.com/PDFs/Wiseco-HarleyShovelhead1340.pdf
    Last edited: Jan 23, 2011
    Lucifer, Jan 23, 2011
    #41
  3. Lucifer

    Lucifer Well-Known Member

    Joined:
    Mar 20, 2008
    Messages:
    3,861
    Likes Received:
    102
    Location:
    Cape Breton NS,Canada
    I don't think the vibration would be that much more than a single plugged head if at all...the cost of dual plugging heads for just one model and different pistons probably would have been the demise of the 1200S.
    These guys are mostly metric bike riders and find all Harley's vibrate too much for them.
    Lucifer, Jan 23, 2011
    #42
  4. chucktx

    chucktx Moderator Staff Member

    Joined:
    Jul 5, 2005
    Messages:
    12,545
    Likes Received:
    10
    ya....i was just stating what the article said.......
    chucktx, Jan 23, 2011
    #43
  5. Lucifer

    Lucifer Well-Known Member

    Joined:
    Mar 20, 2008
    Messages:
    3,861
    Likes Received:
    102
    Location:
    Cape Breton NS,Canada
    If he took his OL for a ride he wouldn't have said that...;):D
    Lucifer, Jan 23, 2011
    #44
  6. chucktx

    chucktx Moderator Staff Member

    Joined:
    Jul 5, 2005
    Messages:
    12,545
    Likes Received:
    10
    :roflmao:
    chucktx, Jan 23, 2011
    #45
Page 3 of 3

Share This Page

XenPorta © Jason Axelrod from 8WAYRUN.COM