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[Machinmacone]

Hi all
          Was looking on ebay yesterday and spotted some lpg spark plugs they are dearer than the norm has anyone tried them? are they any good  Cheers Julian

                            

[serek]

best way go to your local shop ask for NGK spark plugs and say you have lpg on car and they fund out right one for your car

[Lazydocker]

or contact NGK Technical help and they'll tell you which ones you want. Don't bother with multi-electrode or platinum/iridium plugs... IME they're a waste of money

[Kevin Wood]

Mine runs perfectly happily on LPG on the GM 4 electrode plugs which currently have about 25K on them. They're dirt cheap with a TC too.

Now I've got LPG I would replace with 2 electrode GM plugs which are even cheaper. The only real advantage of multi-electrode plugs is service life.

I think there's a lot of snake oil associated with exotic spark plugs. Yes, if you've got an exotic racing engine you'll have problems with a bog standard plug and iridium plugs, etc. might be your solution but that doesn't apply to an Omega, even with LPG IME.

For the cost of a set of Iridiums, work out how many GM sets you could buy. Labour to change them is free.

It might be worth getting a set of plugs a grade colder on LPG, but that needn't make them any more expensive.

Kevin

[lpgelite]

Agree with Kevin re 4 electrode GM plugs. Very good on gas.

Please DO NOT use Iridium or Platinum plugs with LPG as their low electrical conductivity will cause arcing and insulation breakdown in DIS pack and plug leads.

Best for LPG is copper core plugs such as NGK. Also had good results with Bosch Yttrium which have higher conductivity.

LPG is tough for plugs 'cos the gas / air mixture is very dry and harder to jump a spark across the electrodes, hence the need for higher conductivity plug electrodes.

Recommend changing plugs after no more than 30k miles on LPG due to insulation issues.

[Marks DTM Calib]

Agree with Kevin re 4 electrode GM plugs. Very good on gas.

Please DO NOT use Iridium or Platinum plugs with LPG as their low electrical conductivity will cause arcing and insulation breakdown in DIS pack and plug leads.

Best for LPG is copper core plugs such as NGK. Also had good results with Bosch Yttrium which have higher conductivity.

LPG is tough for plugs 'cos the gas / air mixture is very dry and harder to jump a spark across the electrodes, hence the need for higher conductivity plug electrodes.

Recommend changing plugs after no more than 30k miles on LPG due to insulation issues.

Sadly, I fear you are miss informed.

Resistance of the plug will have little effect on the spark as the spark current is bugger all!

Reality is that the DIS pack is capable of generating upto 40KV and the standard plugs with a 1mm plug gap are pretty well suited to LPG anyway (as fitted to the Vx Factory fit LPG cars!).

I would not bother spending money on anything other than a standard set of twin electrode plugs as a the quad electrode ones can create problems of spark shielding!

[omegod]

Im running with standard GM ones, absolutely fine. Loads of tripe about on the issue.

[Machinmacone]

Hi all
          Thanks for the replies just ordered a set of standard GM twin electrode as advised.

                                 Cheers Julian.