Not an XJR, but I'm running a Super V8 on LPG. Converted in October last year.

If there are any specific questions, just ask .....

Regards,

Brian.

 

Only downside is the valve seats are very soft on the V8 heads, the valve seats recess and it's game over. Head rebuild time.

You don't see too many Jags showing this, as not many are on gas, but there are alot of RangeRovers on gas. Pleanty of cheap ones needing headrebuilds due to gas damaged heads.

 

Thanks for the answers - I guess a realistic idea of MPG would be good - I need to factor in what the extra costs in fuel might be.

 

The cost for the conversion was £2,600. In addition you need to factor in some allowance for unleaded fuel as the engine starts up on unleaded and switches over once warm. In addition, you need to factor is some lubricant at £17 per 1,000 litres of LPG. Also, the system requires servicing annually at a cost of about £60. It soon adds up!

I worked out that it would take me approximately 18 months to break even after which I was saving approximately £140 per month. At the minute,
it is costing me about £40 per 220 miles instead of £90 per 250 miles (very rough "before and after" values), without factoring in additonal unleaded, lubricant and servicing.

I had the same misconception that you get more MPG with LPG but you don't ..... you actually get slightly reduced MPG, about 18 instead of 20 in my case, but as LPG is approximately 50% of the cost of unleaded this is where the savings lie.

I cannot comment too much on the "valve seats" issue, but my understanding is that the engines are prone to this issue anyway so this is an additional risk you would take admittedly. I mitigate against this to some extent by running every so often on unleaded only in addition to the period of start up already mentioned.

Regards,

Brian.

 

Thanks for all that Brian -excellent info and much appreciated.

 

No worries. If there is anything else I haven't covered please just ask.

Please keep us informed of your decision!

Regards,

Brian.

 

Just one thing of note. Eurotunnel won't let you travel with LPG.

 

How would they know? :wink:

 

Depends where your filler is, and if they spot it on your return journey it's gonna be pretty inconvenient. If it's hidden then I don't see them spotting it, smell it perhaps, easy to just switch to petrol for loading of course. What's the availability of lpg abroad?

 

Last time I went on there they had CCTV inspection of the whole vehicle including underside. I guess if they know what they are looking for it would be easy to spot - then again, maybe not. Not the end of the world - I have to fly to France these days as her indoors can't spent more than 10 minutes in any car journey without moaning. Although I could work on taking the car whilst she flies

 

Why would anybody want to use the eurotunnel when a nice relaxing meal on a ferry ( It is possible and cost about the same as the cafe ) will set you up so well for the next part of the drive, if you include loading and security checks there is very little time saved anyroad
HJ

 

There is a company called Go LPG who claim to specilize in Jags. Anyone out there used them, Any coments
HJ