Go LPG! Research - BMW

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Go LPG Research - BMW

BMW 740 4.4 litre V8 goes all economical!

740 goes all economical! An awesome beast.

Go LPG! were asked to teach it another trick.....

It was about time we turned our attention to BMW's.

Mike Smith of Lucas Electronics asked us if we could convert the mighty 4.4 litre BMW V8 as fitted in his 740. We advised him that whilst some cars have been converted using single point mixers, Romano multi point sequential injection equipment would make a proper job of it.

We were not wrong. The car gives performance equal to (and slightly better than!) petrol operation. Most of the electronics were easy to stash in the existing ECU boxes and the tank made little impact on the boot.

All in all, a very pleasing and worthwhile conversion for both us and the owner.

Want your BMW converted?

Read on!

Here are some pictures of Mike's converted 740

The 400mm 90 litre cylinder fits like it was made for the car. The remaining boot space will still accomodate two large suitcases whilst holding 74 litres (15.8 imp. gals) of nice cheap LPG.
A filler position was found on the rear bumper, forward of the dumb iron (impact absorber). It can just be seen on the bottom of the bumper around the centre of the picture.

This site gives reasonable rear impact protection and places the filler within easy reach. The 7 series bumper is particularly awkward for filler mounting and this is the only position that will conform to current LPGA requirements (See 'Fillers' for more information)

A plumber's nightmare - The two LPG reducers and associated pipework are mounted on the nearside inner wing. Not wholly ideal for impact protection but the system is fully protected by solenoids to shut of the gas if a pipe is severed, and what other space was available?


A good fuel choice switch position was crucial to the finish of this job. We sought one that allowed a good view of the LPG gauge but not stuck in the driver's face on night journeys (can be annoying!).

Eventually Mike found his own site, choosing to have it mounted in a blank in the left hand side of the lower portion of the centre console. It was a good choice. The switch looks like original equipment and fulfils all of the criteria..

Much later (2006) we found an alternative switch postion. On the 2000 onwards 7 series cars the eariler switch position (shown above) is not available.

A car with a concealed and removable towbar gave us the opportunity to mount the filler under the removable towbar flap ( the square filler cover can be seen on the right of this picture). We now offer this as an alternative filler site, although the extra labour of removing the rear bumper, cutting out the flap aperture etc. and refitting the bumper adds around 100 to the whole job. Also the car must be supplied with a BMW towbar cover/flap in readiness (cost less than 20 from the main agents).


Your 740 or other BMW V8........

Pricing -

The 740 V8 conversion is very specialised. A lot of research went into it. You won't find many firms offering this conversion, and even less getting it right. We have converted several similar cars and have all the data recorded to do more. Romano 'N' system multi point sequential gas injection equipment is installed, fed by a 90 litre cylinder tank.

The reasoning behind our choice of conversion equipment is fully explained in the item 'What type of conversion is best for my car?'

All owners report savings in fuel cost of at least 50%, some above that if driven carefully. It is very hard to tell when the car is running on gas as performance is practically identical to that of Petrol.

The conversion takes 5 days to complete (including up to 100 miles of fuel mapping and road testing) at a cost of 1950 inclusive for pre 1999 vehicles and 2000 inclusive for post 1999 vehicles.

We give 12 months parts and labour warranty and issue an insurance certificate with every conversion.

Before we can give a price estimate and book a conversion slot for this model you must read this item on NIKASIL lined engines.

5th April 2005

Time moves on.............

Since we converted Mike's car he has covered 55,000 miles on LPG. He saved the whole cost of his conversion a long time ago and reports that he is now close to saving a further 3000 on fuel.

Mike has not suffered any problems with the car or the conversion, but recently he bought the car back to us for attention - His firm had moved, he wanted more range so we fitted an extra spare wheel tank for him.

Now Mike's car carries over 130 litres of LPG from one fill.

Contact us to arrange the conversion of your vehicle using the latest Romano 'N' multi point injection system

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LP Gas burns cleanly.....

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Click here to get a quote for the conversion of your vehicle