L322 LPG - known issues?

[Duke Thrust]

Chaps,

Anyone have any info on potential problems with LPG in an L322?

My 4.4 V8 has a BRC multi-point system fitted, my local RR indy says he hates LPG conversions and sees lots of problems with the blocks cracking and running very hot.

Any experiences with such problems?

[Duke Thrust]

Texpis said:

Depends which engine the BMW 4.4 is apparently okay I have owened mine for a year with LPG and the car has been fitted with LPG since it 2005. I have had no problems not sure about the previous owner.
I have read on the Range rover sites that the Jaguar 4.4 engine can be problamatic because the valve seats are not hardened. I have never heard of cracked blocks on these cars.
Do you think he meant the previous incarnation the p38 these were notorious for cracked blocks with or without LPG.

Mick

Yes, he specified the BMW M62 engine - (which is mine) I'm looking into flash lube systems for the LPG. The M62 is a hot running engine, high pressure water systems (ie higher temps) make this more problematic. It seems that the flash lube lowers the combustion temp (LPG burns hotter and dryer than petrol) and protects valve seats. Mind you, it could be snake oil so am looking into it.

http://www.autogassolutions.co.uk/about-lpg/flash-...

[Duke Thrust]

Thanks guys, all very interesting.

I wonder how many of the 'issues with LPG' my indy has seen have other root causes. The rads on the L322's are not great and the M62 does have a reputation for blowing off hoses. With the hotter temps of LPG running I wonder if it's just bringing to light other cooling issues.