Lpg Spark Plugs

[W4SIM]

My GS300 is running on LPg but getting some horrendous MPG. Im pretty sure most of it will be down to the fact that it'll be running on standard plugs.

Im looking at changing over to some LPG specific plugs but not sure where to get them or who does something decent.

Found a set on eBay and the guy is claiming they are good with LPG. According to their tests the plugs giving on average an extra 50 miles from 90 litres of LPG. They last about 10-12k and the brand is PSP, never have heard of them, anyone?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...p;rd=1&rd=1

I also saw a link somewhere in here to some LPG plugs made by NGK if i remember correctly. Dont know the price of those but im guessing a fair bit dearer than these ones, but will probably offset that by their longer life or something.

But is there any one on here that uses specific plugs for LPG? And what can you say about them, good, bad, worse mistake ever made etc etc???

Cheers.

[dibsLPG]

My GS300 is running on LPg but getting some horrendous MPG. Im pretty sure most of it will be down to the fact that it'll be running on standard plugs.

Im looking at changing over to some LPG specific plugs but not sure where to get them or who does something decent.

Found a set on ebay and the guy is claiming they are good with LPG. According to their tests the plugs giving on average an extra 50 miles from 90 litres of LPG. They last about 10-12k and the brand is PSP, never have heard of them, anyone?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...p;rd=1&rd=1

I also saw a link somewhere in here to some LPG plugs made by NGK if i remember correctly. Dont know the price of those but im guessing a fair bit dearer than these ones, but will probably offset that by their longer life or something.

But is there any one on here that uses specific plugs for LPG? And what can you say about them, good, bad, worse mistake ever made etc etc???

Cheers.

Your link does not work?? or is it just my pc.. But has far has i am aware their is no special Spark plugs that you would use just for LPG. your best bet is to speak to an LPG installer and he / she will tell you the plug have nothing to do with it.. But i might be corrected. Best to replace the plug with Denso Irridium plugs (i htink they are the same for the GD) mine is an IS200 on LPG.

I am planning to speak to a LPG service mechanic and i will ask him the same Q so i will Keep me posted.

Dibslpg.

[Kazi]

Not sure if using IK22 Denso plugs would help. Their the plugs I use and other members use with non-naturally aspirated cars use.

[W4SIM]

Your link does not work?? or is it just my pc.. But has far has i am aware their is no special Spark plugs that you would use just for LPG. your best bet is to speak to an LPG installer and he / she will tell you the plug have nothing to do with it.. But i might be corrected. Best to replace the plug with Denso Irridium plugs (i htink they are the same for the GD) mine is an IS200 on LPG.

I am planning to speak to a LPG service mechanic and i will ask him the same Q so i will Keep me posted.

Dibslpg.

The link does work on my PC, but if you have no luck then go on eBay and search this item number 160101599768 , Thats the LPG plugs.

I think you'll find LPG burns differently to normal petrol, as diesel does to petrol aswell. Working on that information it makes sense that a different spark plug should be required. If it was just a claim made on eBay i wouldnt have believed it but its also made by NGK, one of the worlds biggest spark plug manufacturers. My car doesnt run "rough" with the current plugs but it is WAY down on power when running on LPG and im not getting as much mileage from a tankful as i was hoping.

Im wanting to see a LPG installer myself but havnt had the time yet, but if you see one i would like to hear their opinion on it.

[W4SIM]

Just found this on www.spark-plugs.co.uk in the general FAQ area.

Q3. My vehicle has been modified to run LPG (liquid propane gas) or dual fuel, do I need to change my spark plugs to allow for this?

A3. Generally speaking no. Plugs may not last quite as long as with a standard petrol engine and the ignition system may have a harder time generating a spark. The denser charge in the combustion chamber means a higher voltage is required to jump the gap. For this reason it may help to reduce the spark plug gap by 0.2mm. If spark plugs become prone to overheating then it may be necessary to replace with plugs one grade colder.

Not too sure if i understand the answer correctly but it seems like in one bit they're saying they dont need to be changed, and then they're saying the current plugs and ignition system may be having a harder time so changing spark plugs may be a good idea. I think im abit confused by the answer really.

[Roy GS]

I was told years ago that iridium plugs are the best because of the higher temperature on running gas, and you have to adjust the gap to suit,  laserline are apparently the main ones used in Europe also the gap is made smaller by an average of 0.1mm. Some garages say you can use Platinum but once again I heard that isn't true because they wear quickly and can cause issues on LPG cars. There are lots of different sites to look at for info on this, so take a bit of time and read the info.

[Malc1]

16 hours ago, Roy GS said:

so take a bit of time and read the info.

Roy hi ....  Bluesman on here ( recently changed his name ) had an LPG Ls400 for ever and still has one with LPG  ........  A Mod here too at some time 

He might well have some very useful info for you if you can track him down  ........  maybe ask the Mod  Steve2006 about this too

Good luck

Malc

[messi]

I've had lpg on my ls400 since 2018,I have irridum denso sparkplugs, there is no such thing as lpg sparkplugs, dont fall for it

[Bluser]

On 4/5/2007 at 10:52 PM, dibsLPG said:

Your link does not work?? or is it just my pc.. But has far has i am aware their is no special Spark plugs that you would use just for LPG. your best bet is to speak to an LPG installer and he / she will tell you the plug have nothing to do with it.. But i might be corrected. Best to replace the plug with Denso Irridium plugs (i htink they are the same for the GD) mine is an IS200 on LPG.

I am planning to speak to a LPG service mechanic and i will ask him the same Q so i will Keep me posted.

Dibslpg.

I have run on LPG with just normal plugs for 24+years and never has their been a problem. 

 

[Mr Vlad]

WOW is this a new record? SEVENTEEN years between replies. 

Interesting thread. Think I'll phone a friend (where have I heard that before 🤣). 

He ran a RX350 on lpg for years but now has moved to the 'dark side' mercedes  yuk!

Just a few years ago I enquired about a lpg conversation on a RX350 and I asked lots of questions and got more answers. Not once was sparkplug mentioned 🤔.