Go Back   Harley Davidson Forums > Harley Davidson Motorcycles > Classic > Shovelhead
Sign in using an external account
Register Forgot Password?
Search

Shovelhead A place to talk about Shovelheads.

Reply
 
 
 
P
 
Thread Tools Search this Thread
  #1  
Old 11-14-2010, 02:31 PM
fxs_hufee fxs_hufee is offline
Hang Around
Join Date: Nov 2010
Posts: 3
Default Duel plug heads????

Hey Guys I just bought my first HD, it an 1982 FXS lowrider, I have no ehistory on the bike. My question is are the duel plug heads stock or after market?. I'm sure I'll have many other questions as time passes and I clean it up over our long Canadian winter. Thanks in advance for you r feedback

Hufee
Reply With Quote
  #2  
Old 11-14-2010, 05:15 PM
sqdealgeorge sqdealgeorge is offline
Road Warrior
Join Date: Dec 2007
Location: Mauston Wi
Posts: 1,792
Default

Duel plug not stock I did a 93CI shovel with duel plug heads and single fire Don't know if the 2 plugs per cylinder helped but the bike was impressive It looks good with all the plug wires running around You can also run compression release plugs off the unused plug holes if you ever want a high comp stroker motor
Reply With Quote
  #3  
Old 11-14-2010, 08:31 PM
TwiZted Biker's Avatar
TwiZted Biker TwiZted Biker is offline
Big Kahuna HDF Member
Join Date: Mar 2009
Location: Niles Canyon Ca.
Posts: 26,469
Default

Not stock but a very nice addition for a shovelhead , solves a few chronic problems like fussy starting and dirty spark plugs . You can run the cheap pump gas without knocking and pinging . I've dual plugged every shovel I've ever owned and about 70% of the rebuilds I do for people . When doing a tune up you may find the bike will run better with the timing backed off a few degrees . Looking in the timing hole you see the mark on the flywheel centered is 35 deg. , move the mark to the rear of the hole so you just see it that,s 2 1/2 deg retarded . I've found that or a hair more is the sweet spot for shovels & dual plugs .
__________________
1972 93" ShovelSaurus Rex


If you haven't been to the edge your just a tourist in life's cheap seats .

When you think your day can't suck any worse remember somewhere somebodies job is making *****'s
.
Reply With Quote
  #4  
Old 11-18-2010, 03:57 PM
Wheelup's Avatar
Wheelup Wheelup is offline
Senior Rider
Join Date: Aug 2010
Posts: 426
Default

Great if it's kick only.
Reply With Quote
  #5  
Old 11-18-2010, 05:15 PM
TW's Avatar
TW TW is offline
Road Master
Join Date: Jun 2008
Location: Illinois
Posts: 1,017
Default

Shovelhead combustion chambers were very inefficient. I've had 2 that were dual-plugged.
It will help burn off more of the air/fuel mixture.
__________________
***************************************

I'm not a gynecologist, but I'll take a look.
Reply With Quote
  #6  
Old 11-18-2010, 05:36 PM
CustomRKC04 CustomRKC04 is offline
Hang Around
Join Date: Nov 2010
Posts: 59
Default

Yah definately not stock my dad runs dual plugs on his 74 Kick only with some other mods to the motor he had it blue printed at Lake shore H-D in like 1980 and its one of the best sounding bike Harely ever built. By the way his 74 is for sale if anybody is looking.
Reply With Quote
  #7  
Old 12-15-2010, 04:18 PM
Scottyscycle Scottyscycle is offline
Hang Around
Join Date: Dec 2010
Posts: 2
Default

Quote:
Originally Posted by TwiZted Biker View Post
Not stock but a very nice addition for a shovelhead , solves a few chronic problems like fussy starting and dirty spark plugs . You can run the cheap pump gas without knocking and pinging . I've dual plugged every shovel I've ever owned and about 70% of the rebuilds I do for people . When doing a tune up you may find the bike will run better with the timing backed off a few degrees . Looking in the timing hole you see the mark on the flywheel centered is 35 deg. , move the mark to the rear of the hole so you just see it that,s 2 1/2 deg retarded . I've found that or a hair more is the sweet spot for shovels & dual plugs .
I have to ask Twizted Biker, Did you intend to explain timing the ignition this way ? I have not posted before on this forum and would have preferred to do it in private, but that is backwards, I hate to say, leaving the front of the hole is retarded as the piston would be closer to TDC in which the firing would be later (retarded). Timing the ignition at the rear of the hole would fire sooner (advanced) Hate to see folks doing their timing incorrectly as that is one of the main benefits of dual plugged heads when used on a Hemi Head design
Reply With Quote
  #8  
Old 12-15-2010, 06:38 PM
sqdealgeorge sqdealgeorge is offline
Road Warrior
Join Date: Dec 2007
Location: Mauston Wi
Posts: 1,792
Default

I go along with Twizted here the line on the wheels should be centered at the normal advance mark (front cylinder ) for timing By bringing this line to the rear slightly The bikes seem to run better Maybe because I run the 52 with the line at the rear of the timing hole (circuit breaker ) or maybe we're both retarded
Reply With Quote
  #9  
Old 12-15-2010, 08:00 PM
panz4ever's Avatar
panz4ever panz4ever is offline
Outstanding HDF Member
Join Date: Oct 2005
Location: Santa Klaus County, Cali
Posts: 3,052
Default

Ran a custom built 96" kick only pan as described by Twizted and it ran like a raped ape.
Reply With Quote
  #10  
Old 12-29-2010, 08:33 PM
Hillsidecycle.com's Avatar
Hillsidecycle.com Hillsidecycle.com is offline
Sponsor
Join Date: Oct 2009
Posts: 5,934
Default

This may come as a complete shock to many folks but dual plugs ain't what most think. We have dual-plugged Pans, Iron & Evo XL's, Shovels, Evo's and Twin Cams, over the almost 3 decades we have been in business.
Small engines, as well as large powerplants.
NEVER had we EVER experienced anything earth-shattering, in regards to doing so, while dyno testing/tuning later, and trust me, we shook the trees.
Machine heads, 4 plugs, 2 sets of wires, multiple coils, specialty coil mounts, usually along with a single fire ignition.
Let's see...........650.00 plus dollars for no more torque, or hp, in a street driven bike.
Think I'd rather have a bar of soap.
Scott
__________________
HILLSIDE MOTORCYCLE & MACHINE, INC.
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
315-495-6650 tel/fax
www.hillsidecycle.com
Palmer's Performance Products
Complete Machine Shop
Case Boring, Cylinder boring
Complete Cylinder Head Shop
Serdi and Goodson Tooling
Super-Flow Flow Bench
Crank Rebuilding
Dyno Tuning
Our Predator Series Engines
From Flatheads, to 2015 models.
"OVER 30 YEARS OF BUILDING HARLEY POWER"
Facebook/Hillside Motorcycle & Machine
Reply With Quote
Old 12-29-2010, 08:33 PM
 
 
 
P
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
big radius for duels dulley Touring Models 1 02-21-2014 07:33 PM
duel fire coils ruin66 Sportster Models 0 10-20-2013 10:04 PM
V&H Power Duels vs Dresser Duels P51Driver Touring Models 12 04-28-2013 09:45 PM
V&h power duels or true duels Dockt0r_Wh0 Exhaust System Topics 7 12-27-2012 07:28 AM
Front turn signals for my '77 fxs Conaing Shovelhead 1 10-19-2010 10:22 PM


Tags
chat, dual, eagle, evo, factory, harley, heads, plug, plugged, rooms, screaming, shovelevo, shovelhead, spark, sportster


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join HDForums

Advertising
Featured Sponsors
Vendor Directory
Sponsors

All times are GMT -5. The time now is 12:06 AM.


Internet Brands, Inc.