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Old 10-21-2009, 08:37 PM   #1
jestephens   jestephens is offline

 
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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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Old 10-21-2009, 08:43 PM   #2
ringadingh   ringadingh is offline
 
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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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Old 10-22-2009, 01:21 PM   #3
blowndodge   blowndodge is offline
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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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Old 10-22-2009, 01:45 PM   #4
glwilson   glwilson is offline
 
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about those spark plugs


Quote:
Originally Posted by Blowndodge "Darksider"
the "squish" area
The "SQUISH" area... now... that's a technical term -- right?
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Old 10-22-2009, 01:59 PM   #5
snarleybill08   snarleybill08 is offline
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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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Old 10-22-2009, 02:38 PM   #6
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about those spark plugs


Quote:
Originally Posted by jestephens
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 ;)
Its got a technical name (lol). Its called "wasted spark ignition".

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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Old 10-22-2009, 05:11 PM   #7
blowndodge   blowndodge is offline
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about those spark plugs


Quote:
Originally Posted by glwilson
Quote:
Originally Posted by Blowndodge "Darksider"
the "squish" area
The "SQUISH" area... now... that's a technical term -- right?
Ok Harley turncoat! "squish band" measured in width and angle from the outside edge of the head as related along the head plane to the sparkplug. This band length and angle are used to create "turbulance" inside the combustion chamber for better flam propagation.

Now get back on that leaky Harley and ride!!
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Old 10-22-2009, 09:10 PM   #8
glwilson   glwilson is offline
 
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about those spark plugs


Quote:
Originally Posted by Blowndodge "Darksider"
Quote:
Originally Posted by glwilson

The "SQUISH" area... now... that's a technical term -- right?
Ok Harley turncoat! "squish band" measured in width and angle from the outside edge of the head as related along the head plane to the sparkplug. This band length and angle are used to create "turbulance" inside the combustion chamber for better flam propagation.

Now get back on that leaky Harley and ride!!
It's too cold out... I only ride when it's "comfy"!!! ;)
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Old 10-22-2009, 09:32 PM   #9
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about those spark plugs

What, he rides a Harley and he's still an Ultimate Member ;)
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Old 10-22-2009, 11:31 PM   #10
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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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Old 10-24-2009, 03:09 PM   #11
glwilson   glwilson is offline
 
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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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Current Rides: 2017 HD Ultra Limited & 2011 Can Am Spyder RTS-SE
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Old 10-24-2009, 04:21 PM   #12
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about those spark plugs


Quote:
Originally Posted by Blowndodge "Darksider"
Quote:
Originally Posted by glwilson

The "SQUISH" area... now... that's a technical term -- right?
Ok Harley turncoat! "squish band" measured in width and angle from the outside edge of the head as related along the head plane to the sparkplug. This band length and angle are used to create "turbulance" inside the combustion chamber for better flam propagation.

Now get back on that leaky Harley and ride!!
Now that ^ was a squish!
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Old 10-24-2009, 10:55 PM   #13
AlabamaNomadRider   AlabamaNomadRider is offline
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about those spark plugs

Squish is a good sound when you are really having fun.
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Old 10-24-2009, 11:23 PM   #14
skeeter   skeeter is offline
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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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Old 10-25-2009, 12:21 PM   #15
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about those spark plugs


Quote:
Originally Posted by skeeter
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?
Yeah Greg, I wasn't going to say anything but now that skeeter brought it up.
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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