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10-21-2009, 08:37 PM | #1 |
Join Date: Jan 2009
Location: Fairview Heights, IL (StLouis)
Posts: 1,601
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about those spark plugs
I just read a recent post about our spark plugs in the Garage forum, and it reminded me of a question I wanted to ask you all.
::) Why 4 plugs in a 2 cylinder engine? My first presumption was for twice the spark thus a more efficient burn and power . . . . BUT THEN someone told me that one set fired on the exhaust cycle in order to burn any remaining fuel thus reducing emissions. So which is it? Or maybe something really cool I don't even know about ;)
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Jay Stephens, Former National Vice President (2013-2015) 2006 Yamaha FJR1300 formerly 2011 Vaquero- Black formerly 2005 Nomad - black/silver Login or Register to Remove Ads |
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10-21-2009, 08:43 PM | #2 |
Join Date: Aug 2007
Location: Newmarket Ontario Canada
Posts: 35,387
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about those spark plugs
The plugs fire at the same time in the cylinder, its an easy way of getting a better burn in a large displacement motor. We only have two coils, one for each cylinder. If you wanted to fire the plugs independently you would need a separate coil for each plug or a distributor.
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2002 Nomad aka Bountyhunter VBA #27 VROC #18951 |
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10-22-2009, 01:21 PM | #3 |
Sr. Contributor
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about those spark plugs
Dual flame fronts allow the burning mixture to travel through the "squish" area more efficiently thereby allowing more advanced timing without detonation. As you can see it doesn't work worth a sh*t on the Nomad.
This wouldn't be needed with more centrally located spark plugs.
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I love my Victory Cross Country Tour 106. Smells like Victory! Ultra's are Limited There are two types of Harley riders. Those that trailer them and those that push them. The most Interesting Man in the World "Find the things in life you don't do well and don't do those things" Member # 0005 |
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10-22-2009, 01:45 PM | #4 | |
Join Date: Jul 2008
Location: North Central Illinois
Posts: 8,575
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about those spark plugs
Quote:
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"During times of universal deceit, telling the truth becomes a revolutionary act." "You can have your own opinion, but not your own facts." Former VBA NCR Assist Regional Leader Formerly: 2004 1500FI Bronze Nomad: 2009 & 2014 HD Ultra Current Rides: 2017 HD Ultra Limited & 2011 Can Am Spyder RTS-SE Attended: VBA National Rallies 2009, 2011, 2015; VBA/NCR Regional Rally 2010, 12, 14, 16 and several rides throughout with regional members. VBA Member #652 HOG Member #3935417 |
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10-22-2009, 01:59 PM | #5 |
Member
Join Date: Oct 2009
Posts: 273
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about those spark plugs
they do all fire on the exaust stroke but not for any reason benefitting the engine. it is so they don't need a distributor. a whole lot of engines do this. even lawn mower engines. firing on the exaust stroke has no benefit whatsoever, and it will shorten the electrode life of the plugs. bill
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10-22-2009, 02:38 PM | #6 | |
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about those spark plugs
Quote:
the front pot and rear pot all fire together, so when the front is on compression and needs the spark, the rear is on exhaust and the spark has no use at all. As bill says it saves on a distributer, keeping build costs down. But Plugs will still work for over 30,000 miles if you want them to. ::) |
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10-22-2009, 05:11 PM | #7 | ||
Sr. Contributor
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about those spark plugs
Quote:
Now get back on that leaky Harley and ride!!
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I love my Victory Cross Country Tour 106. Smells like Victory! Ultra's are Limited There are two types of Harley riders. Those that trailer them and those that push them. The most Interesting Man in the World "Find the things in life you don't do well and don't do those things" Member # 0005 |
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10-22-2009, 09:10 PM | #8 | ||
Join Date: Jul 2008
Location: North Central Illinois
Posts: 8,575
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about those spark plugs
Quote:
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"During times of universal deceit, telling the truth becomes a revolutionary act." "You can have your own opinion, but not your own facts." Former VBA NCR Assist Regional Leader Formerly: 2004 1500FI Bronze Nomad: 2009 & 2014 HD Ultra Current Rides: 2017 HD Ultra Limited & 2011 Can Am Spyder RTS-SE Attended: VBA National Rallies 2009, 2011, 2015; VBA/NCR Regional Rally 2010, 12, 14, 16 and several rides throughout with regional members. VBA Member #652 HOG Member #3935417 |
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10-22-2009, 09:32 PM | #9 |
Join Date: Jul 2007
Location: Peoples Republic of New York State
Posts: 15,154
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about those spark plugs
What, he rides a Harley and he's still an Ultimate Member ;)
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Tim "TC" Conley VBA #9 2011 Victory Kingpin mine 2013 Victory Boardwalk -hers [LEFT][COLOR=#000000] [SIZE=4] |
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10-22-2009, 11:31 PM | #10 |
Join Date: Jun 2008
Location: NW Region
Posts: 5,222
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about those spark plugs
Greg bought a Harley?...oh no...now he is a 99 percenter!
Next thing you know he will be wanting to grow the federal government, support the entitlement programs, bailouts, and help B.O. (I love calling him B.O....because he stinks!) run for re-election!
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VBA #659 2003 Nomad 1500 (Gone but never forgotten) 2005 Honda ST1300 - Sweet and still kickin 2006 Honda Goldwing - Best Boat in the Marina |
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10-24-2009, 03:09 PM | #11 |
Join Date: Jul 2008
Location: North Central Illinois
Posts: 8,575
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about those spark plugs
See what you started BD!!!
I fessed-up to the purchase the week I did it in late July. I stepped-down from being an ARL of the NC Region. Trip allowed me to hang around anyway. Regarding entitlements, bailouts, socialism, and that kind of crap... you can count on me to not support that. HOWEVER.. regarding "BO" -- I like that! ;) That's what I'm going to start using from now on. So... in conclusion... all of you guys watch your plugs when it concerns the "squish" area!
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"During times of universal deceit, telling the truth becomes a revolutionary act." "You can have your own opinion, but not your own facts." Former VBA NCR Assist Regional Leader Formerly: 2004 1500FI Bronze Nomad: 2009 & 2014 HD Ultra Current Rides: 2017 HD Ultra Limited & 2011 Can Am Spyder RTS-SE Attended: VBA National Rallies 2009, 2011, 2015; VBA/NCR Regional Rally 2010, 12, 14, 16 and several rides throughout with regional members. VBA Member #652 HOG Member #3935417 |
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10-24-2009, 04:21 PM | #12 | ||
Join Date: Jun 2008
Location: 6th Floor up at the The Nervous Hospital up in East Central State, NC
Posts: 7,454
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about those spark plugs
Quote:
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??-Mar.2,2012 "Rocky" My Beloved Dog RIP Mike Tripp VBA#767 '96 800 Vulcan Classic 06 1600 Nomad 07 1600 Nomad "The shoes you buy at the Salvation Army is already been broke in"- Aunt Kawhead |
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10-24-2009, 10:55 PM | #13 |
Sr. Contributor
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about those spark plugs
Squish is a good sound when you are really having fun.
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Gene Cross, Jr. Boaz, Alabama KawaNOW/VBA #1181 |
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10-24-2009, 11:23 PM | #14 |
Sr. Member
Join Date: Mar 2008
Location: Kerrville Tx
Posts: 1,713
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about those spark plugs
Can you squish your pics together so your harley will fit on my screen.
Where was the picture of the Harley taken? Do you have any pics on photobucket?
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Robert(skeeter)Dozier 07 Red&Titanium Nomad 81 Suzuki 850GL KawaNow pre# |
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10-25-2009, 12:21 PM | #15 | |
Join Date: Jul 2007
Location: Peoples Republic of New York State
Posts: 15,154
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about those spark plugs
Quote:
Could you stack one of your sig pics so some of us don't have to scroll left to right to read any thread you post in? I know you guys get sick of my whining but damn, it is annoying when the screen is made to wide by over sized pictures.
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Tim "TC" Conley VBA #9 2011 Victory Kingpin mine 2013 Victory Boardwalk -hers [LEFT][COLOR=#000000] [SIZE=4] |
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