AuthorTopic: Spark Plugs and LPG  (Read 2108 times)

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Offline blacknight

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Spark Plugs and LPG
« on: August 26, 2006, 22:35:46 »
Thinking of replacing the spark plugs on my 1992 3.9 EFI V8 Range Rover.

Now this vehicle has LPG fitted, so do I still use the recomended spark plugs(whatever they may be) and is the gap affected due to the LPG?

Thanks - Nigel
1996 Discovery 300 Tdi Auto, 3 Door.
1992 Range Rover 3.9 V8 Auto - LPG & 3" Lift. *Now been sold*

Formally known as pj2629 but had to change Username due to Club Reps memory problem!!!

Offline Jake

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Spark Plugs and LPG
« Reply #1 on: August 27, 2006, 11:06:46 »
AFAIK the gaps are the same and you can use normal V8 spark plugs.
I always did on mine and had no problems.
 :D
Jake

Owner - Land Rover Discovery 2
Driver - Land Rover Defender 100" Trayback

Offline Range Rover Blues

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Spark Plugs and LPG
« Reply #2 on: August 27, 2006, 17:51:00 »
Geberal advice is to close them up to 27thou or thereabaout ie 3 thou different.  LPG is much harder to ignite so avoif cheapo parts in your ignition too, for example rotor arms can be up to 1mm shorter, the spark will travel it's easiest path to earth so any problems tend to show up on LPG first.

Personally i used Iridium plugs from Chris Perfect on Blue, they cost £8 each :shock:
The LSe has not had a set in it yet and it runs fine since I replaced the LPG system with a new multi point.  Again the gap is 27 thou.
Blue,  1988  Range Rover 3.5 EFi with plenty of toys bolted on
Chuggaboom, 1995 Range Rover Classic
1995 Range Rover Classic Vogue LSE with 5 big sticks of Blackpool rock under the bonnet.

Offline thermidorthelobster

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Spark Plugs and LPG
« Reply #3 on: August 27, 2006, 21:56:00 »
NGK spark plugs are highly regarded by many LPG buffs.  I use BP5ES or BP6ES in my high compression 3.5v8 on carbs - at least I think that's what they are from memory, it's something like that anyway!

Decent HT leads are a worthwhile investment as well.  Magnecor are well respected.
David French
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1999 Discovery II TD5 Manual
Patriot roof rack, QT Services diff guards front & rear, DiscoParts steering guard[/url], Autologic ECU upgrade, 2" Old Man Emu lift, 235/85R16 BF Goodrich All Terrains, Safari snorkel, DiscoParts jackable sills, Warn Tabor 9000

Ex Disco 200TDI, P38a 4.6HSE and 101FC 6x6 Camper.  Africa Trip Blog

Offline Range Rover Blues

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Spark Plugs and LPG
« Reply #4 on: August 29, 2006, 02:32:51 »
Yep, BP6ES on the hc 3.9 I know off by heart, avoid BPR6ES as the resistor makes things a bit harder.  For heaven's sake never fit platinum plugs, they won't work with LPG.
Blue,  1988  Range Rover 3.5 EFi with plenty of toys bolted on
Chuggaboom, 1995 Range Rover Classic
1995 Range Rover Classic Vogue LSE with 5 big sticks of Blackpool rock under the bonnet.

Offline gtomo2

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Spark Plugs and LPG
« Reply #5 on: September 03, 2006, 19:26:56 »
Quote from: "Range Rover Blues"
Yep, BP6ES on the hc 3.9 I know off by heart, avoid BPR6ES as the resistor makes things a bit harder.  For heaven's sake never fit platinum plugs, they won't work with LPG.


Oh now that makes sence guess which plugs i have fitted to my LPG yes they are ngk yes they have BP at the start and a 6ES at the end plus a letter R in them as well. Think i will be buying a new set of plugs very soon :roll:
Mr Graeme Thomas (tomo)
300 TDi Discovery - So i can go fording
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Offline blacknight

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Spark Plugs and LPG
« Reply #6 on: September 03, 2006, 22:13:12 »
Thanks for the help - new plugs now fitted.

NGK BP6ES

Nigel
1996 Discovery 300 Tdi Auto, 3 Door.
1992 Range Rover 3.9 V8 Auto - LPG & 3" Lift. *Now been sold*

Formally known as pj2629 but had to change Username due to Club Reps memory problem!!!

 






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