I was looking through some of the posts in here ref fitting LPG to the V8s. S/Cs aside, is there a preference for the BMW vs the Jag V8 (for LPG install)?

Also....what's the power output of each, is there much in it?

I have a bmw engine one on lpg love it to bits. I was told the bmw engine is stronger and better for gas conversions. Not sure how true this is though, I was also told that the bmw engine does not need a valve lube but the jag engines which are on lpg do need a valve lube.

Ahhhh...so the 4.4 jag needs a valve lube the same as the 4.2sc does then? I thought the potential for valve/valve seat burn out was only limited to the SC engines. Good to know.

As above I was told the BMW M62 engine takes gas the best. The valve seats are tough as hell apparently as appeased to the jag one being made of playdogh. I've got the BMW on gas and can't complain or say I've had any issues. 30k miles now on gas [img]http://www.fuelly.com/driver/rob2529/range-rover[img/]
04, 4.4V8, Vogue Oslo Blue with LPG.
"You can sleep in your car, BUT you can't race your house!!!!"

If something can't be fixed with a hammer....... You have yourself an electrical fault!

Play dough......

The 4.4 and 4.2 (S/C) are the same AJV-8 Jaguar engine with some modifications to the S/C from the original normally aspirated. I am expecting the heads (and valve seats) are the same for both.

It surprises me though as all unleaded engines need the harder valve seats and valves due to the lack of cooling effect from the lead.

Personally I would invest in the flashlube system anyway, can't hurt I would say  MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

I reckon that's right......better safe than sorry.......I'll bet it's an expensive engine to rebuild...

Think a head gasket with some valve work runs close to 2k. There is a company out there that make hardened heads for the jag engine. Can't remember their name but might be worth a try if you really want the jag engine And want a fix for if/when the heads die. [img]http://www.fuelly.com/driver/rob2529/range-rover[img/]
04, 4.4V8, Vogue Oslo Blue with LPG.
"You can sleep in your car, BUT you can't race your house!!!!"

If something can't be fixed with a hammer....... You have yourself an electrical fault!

So what year did the jag engines start? Was it all 06 cars?

http://www.rangerovers.net/modelspecs/L322/2006.html

Looks like it  MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

Cheers for that. Another 30bhp changing from BMW to Jag...not a major difference then if choosing between one or the other. I guess the biggest difference is in the other facelifted parts.

According to the Wiki (what transmission have I got) you also get the 6 speed ZF gearbox  MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

for my two penneth worth, i have the bmw engine, -prinz. It was fitted at 60k and its on 147k now, runs sweet, drives fantastic, only problem is a minor one, -as it chages over first time, ie when engine still a bit cool, it has a tiny flat spot, for about 3 seconds. i think my intermediate gas pipe is leaking overnight. ie between the engine gas valve and the tank? will get that checked next time i have some spanner time. On the subject of power bmw vs jag. there is good evidence that bmw played down their bhp figures, on the m62 engine, especially the vanos. (which would be the same at high revvs anyway) -so much that its reckoned to be around the (just over) 300hp which would have had raised a few tax eyebrows, and lobbyists etc. so the quoted 282 bhp is very conservative. -i haven't driven the jag engined version. the bmw engine is very well engineered for its year. I have admired BMW engines anyway. and to me, the idea of a proper 4x4 with bmw running gear, is just about perfection. and is SO much better than all my old P38 and classic range rovers. drivability is so refined, handling firm, and the engineering is just right. -for an oldish car! so glad i didnt go diesel! theres a lot more money to spend for the jag engined car, which looks very similar, in fact mine has had a facelift, to look like the later model. lastly. mine has a spare wheel 90 litre tank, and i have an upright mounted spacesaver wheel, in the boot, with a cover over it, for full confidence of getting home, and the range is quite good. -and with the iphone, i'm only a few clicks away from finding gas in countryside etc. also, just carried out a front timing chain rebuild, with vanos seals etc, engine at 147k was beautifully clean, and only had light staining (brown) from using proper synthetic oil in its lifetime, absolutely no carbon build-up.

BMW engines are easier to convert and the ECU's work better together. The Jag ECU are like women, fine some days and take a strop others. I believe you also have to install an additive injector for the Jag.

I am in the same boat as johnboy, and he is spot on

BMW Chassis + BMW M62 + Prinz LPG = perfection

@D16XEY yeah I heard that the JAG ECU fails every 28 days