SuzukiSavage.com - Crank Crank Crank BANG! That was interesting

Welcome, Guest. Please Login or Register :: View Members

SuzukiSavage.com › General Category › Rubber Side Down! › Crank Crank Crank BANG! That was interesting

(Moderators: verslagen1, Dave, Serowbot)

‹ Previous topic | Next topic ›

Pages: 1

Crank Crank Crank BANG! That was interesting (Read 10 times)

skrapiron -FSO

Serious Thumper

Offline

Instant Human....
Just add coffee..

Posts: 1456
Pittsburgh, Pa
Gender: male

Crank Crank Crank BANG! That was interesting
08/30/07 at 11:22:32

I just recieved my new iridium plug in the mail today and put it in my bike over my lunch break.

I just went back out and started it to see what kind of improvement there would be.

The bike cranked like normal, but just as it caught, there was a loud backfire, then it ran as it had before.

My question is, is the iridium plug firing too early and causing the backfire on an otherwise lean start? If so, how can I eliminate it (other than put the stock plug back in)?

Everything I say is fully substantiated by my own opinion.

IP Logged

T Mack 1 - FSO Serious Thumper Alliance Member Offline sold 2001 LS650 for a 1986 XLH1100 Posts: 2919 Emmaus,Pa Gender:	Re: Crank Crank Crank BANG! That was interesting Reply #1 - 08/30/07 at 11:26:39 Changing plug wouldn't change firing timing, only change to either a hotter or cooler spark.........which could affect how it runs. Do you know how the plug is rated? ???
Back to top	Engineers design things, Technicians make them work. --- 30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck IP Logged

skrapiron -FSO

Serious Thumper

Offline

Instant Human....
Just add coffee..

Posts: 1456
Pittsburgh, Pa
Gender: male

Re: Crank Crank Crank BANG! That was interesting
Reply #2 - 08/30/07 at 11:29:34

It is an NGK DPR8EIX-9. The plug I just took out was an NGK DPR8EA.

According to the manufacturer, they should be the same plug, same heat range. The difference being that the iridium plug should require less voltage to create its spark.

Is it possible that it is creating a much hotter spark than the stock plug, and thus causing pre-ignition (of sorts?)

Everything I say is fully substantiated by my own opinion.

IP Logged

Max_Morley Serious Thumper Offline LT650 Luxury Touring & sidecar rig Posts: 1490 Moses Lake. WA Gender:	Re: Crank Crank Crank BANG! That was interesting Reply #3 - 08/30/07 at 14:02:03 In a word, NO. ionization voltage and the coil determine the spark voltage. Spark plug just provides a durable place for the voltage to accumulate and then jump to the other contact, hopefulyy igniting the A/F mixture as it does so.
Back to top	Max at Thumper Acres. '96 Savage bagger, '03 Savage w/Cozy sidecar for wifeni. IP Logged

Serowbot

YaBB Moderator
ModSquad

Offline

OK.... so what's the
speed of dark?

Posts: 28644
Tucson Az
Gender: male

Re: Crank Crank Crank BANG! That was interes
Reply #4 - 08/30/07 at 16:26:04

theoretical question?...If you aren't getting any misses, and therefore each chamber of gas is igniting, do you gain anything from a bigger spark from the sparkplug? I mean the size of the spark isn't moving the piston, it's the huge explosion of compressed gasoline that follows the tiny spark.
Kinda' like a bigger flint in your lighter ain't gonna' make the flame burn brighter.
Am I wrong?
O.K..... now let me have it, let the theories fly!

Ludicrous Speed !... ... Huh

...

IP Logged

T Mack 1 - FSO Serious Thumper Alliance Member Offline sold 2001 LS650 for a 1986 XLH1100 Posts: 2919 Emmaus,Pa Gender:	Re: Crank Crank Crank BANG! That was interesting Reply #5 - 08/30/07 at 17:25:17 WELL.........some say a bigger spark will give more complete combustion. Could be true, but not sure. Bigger spark does help a engine that has seen better days (smoker). Would it cause the Bang? ? ? Depends on a bunch of things. Can you get it to do it again??
Back to top	Engineers design things, Technicians make them work. --- 30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck IP Logged

T Mack 1 - FSO Serious Thumper Alliance Member Offline sold 2001 LS650 for a 1986 XLH1100 Posts: 2919 Emmaus,Pa Gender:	Re: Crank Crank Crank BANG! That was interesting Reply #6 - 08/30/07 at 17:31:50 Just noticed your "Do I really need more power? " thread. http://suzukisavage.com/cgi-bin/YaBB.pl?board=RubberSideDown;action=display;n... Combination of the two things might cause the bang.
Back to top	Engineers design things, Technicians make them work. --- 30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck IP Logged

thumperclone Serious Thumper Alliance Member Offline PGR rider riding with respect Posts: 6054 Grand Junction Colorado Gender:	Re: Crank Crank Crank BANG! That was interesting Reply #7 - 08/31/07 at 04:15:40 longer life is the irads' plug best attribute
Back to top	standing for those who stood for US IP Logged

Pages: 1

‹ Previous topic | Next topic ›

« Home