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Did I choose the right plug? 

 

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 Post subject: Did I choose the right plug?
Posted: Sat Aug 22, 2009 8:37 pm 
Getting Side Ways
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Hi all,

Dual fuel EL XR6 Motor....

I searched fordmods for yonks and got lots of sometimes conflicting advice.. but I ended up getting some Bosch super plus WR9LCX+ plugs which I then gapped to 0.8mm.

As I understand it, the WR9LCX plugs are right for the XR motor.. these plugs seem hotter than the Denso's I had in it.. (all of which had a light grey/tan colour on them when I pulled them out.

What are thoughts folks? I had a choice between these and some similiar NGK's.. wasn't sure if I made the right choice..


rgds

Frank
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 Post subject: Re: Did I choose the right plug?
Posted: Sat Aug 22, 2009 8:58 pm 
Getting Side Ways
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The Genuine Ford ones are J16 ARU11 (ND) for LPG and XR. Bosch are good plugs and I am sure they will be ok.

Nippon Denso shows the cross reference of the plugs you picked as being hotter than the ones listed by Ford for your vehicle. Too hot a plug iss almost as bad as not hot enough, I guess only use will tell.
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 Post subject: Re: Did I choose the right plug?
Posted: Sat Aug 22, 2009 11:45 pm 
Tyre Shredder
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With lpg you have to use a colder plug.
I use & recommend ngk's.

 

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FORD EL 4.0L. Crow cam, T.I Performance J3 Chip, Vernier cam gear, CMS stage 3 head, 68mm TB, AU head gasket + ARP studs, AU injectors, Pacey 4480, High flow cat, Shift kit, Stallie, 3:73 TrueTrac.

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 Post subject: Re: Did I choose the right plug?
Posted: Sat Aug 22, 2009 11:55 pm 
Getting Side Ways
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Ride: BA XR6T (mix of BA, BF and FG)

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WA, Australia

racer wrote:
With lpg you have to use a colder plug.
I use & recommend ngk's.



Why does gas require a colder plug? also why does it require or benefit more from a smaller gap?

just curious as to the reasons.....
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 Post subject: Re: Did I choose the right plug?
Posted: Sun Aug 23, 2009 9:49 am 
Tyre Shredder
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Power: 146 rwkw

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NSW, Australia

LPG runs dry so that means more heat in the cylinder.
LPG also has a higher combustion rate = more cylinder pressure.
The bigger the gap the more chance of the spark blowing away.
I'm not a lpg speicalist but i am a sparkie.

 

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FORD EL 4.0L. Crow cam, T.I Performance J3 Chip, Vernier cam gear, CMS stage 3 head, 68mm TB, AU head gasket + ARP studs, AU injectors, Pacey 4480, High flow cat, Shift kit, Stallie, 3:73 TrueTrac.

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 Post subject: Re: Did I choose the right plug?
Posted: Sun Aug 23, 2009 3:39 pm 
Getting Side Ways
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Ride: BA XR6T (mix of BA, BF and FG)

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WA, Australia

Good to know.. thanks.

I guess I should probably have done an 8 range since I'm on gas 90% of the time, but I'm hoping there isn't enough diff there to make a significant issue and I am running 0.8mm...

Funny, I researched on here for over an hour to find the right plug, and in the end I bought the wrong one anyway....

We need a sticky for this.. one that details "fuel only/dual fuel/gas only" for both normal 6's and XR's.

Gonna get more interesting again when I finish the supercharger and have a dual fuel supercharged system... gonna have to get a professional to look into it then.
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 Post subject: Re: Did I choose the right plug?
Posted: Sun Aug 23, 2009 9:31 pm 
Getting Side Ways
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LPG burns slower, thats why it need more advance.

You wont hurt anything with hot plug. i've been using what would be a denso 14 or an NGK 5 in an lpg AU not problems at all.

 

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 Post subject: Re: Did I choose the right plug?
Posted: Sun Aug 23, 2009 10:15 pm 
Getting Side Ways
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Ride: BA XR6T (mix of BA, BF and FG)

Location: Perth
WA, Australia

Good to know MR Tickford. Ta...

I might wind my timing forward a spot actually.. I only really run gas.. the fuel in the tank is premium with injector cleaner in it.. so probably could wind it forward some.
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