Front End LPG conversion for All Rover V8's With Weber 500 Carburettor


Due to the universal fitment and multiple applications of this kit, there are no instructions included.

Complete 'low profile' 4 barrel Carburetor Front end LPG system with our unique Power Plenum and power filter.

(Its all you need for your 4 barrel Carburettorengine to run perfectly on LPG but please enquire first before bidding to ensureof complete compatibility to what you have)

All included inthis listing is bespoke for V8's of all capacities and types, pleasetake a look at the required ignition upgrades too.

A complete Kit:

A Front end system complete for all 4 Barrel carburetor types, this front end system is also offered with our unique 'Power Plenum' and 'Power Shroud' filter system. Including everything you need and see, to convert your Edelbrock, Holly, Weber Carter 4 barrel Carb engine to run superbly on LPG the way only we know how.

We also supply same/similar cost kits for many other similar cars and twin carburetor types such as SU Stromberg and Zenith and on all classics cars ranging from MG to Rolls Royce.

Will this fit my vehicle?

This kit is suitable for all carburetor engines however please enquire first to ensure your vehicle meets specification, also this is the low profile type not only offering more bonnet clearance but also with the intake port angled downwards to compensate for bonnet slope, this is a great advantage of the low profile system.

Power Plenum Dimensions
(all approx)
  • Diameter of Inlet size is 64mm
  • Diameter of underneath centre 130mm
  • Overall Height 65mm
  • Overall Diameter 241.3mm or 9.5inches

What is included in this kit?
  • Our Unique low profile Power Plenum in alloy finish
  • K&N Air Filter with stainless steel power shroud unique to RPi.
  • LPG Change over switch with LPG level gauge and wiring harness
  • OMVL Tandem Vaporiser (our preferred vaporiser for the best performance and economy.)
  • LPG Solenoid and Filter
  • Petrol Solenoid
  • 6mm LPG Copper (Rubber Coated) Pipe
  • Rubber water hose, water T-pieces and LPG Vapour hose
  • All Nuts, Bolts, Jubilee Clips and other parts required to fit all the above parts
  • And of course RPi's. acclaimed after sales service, helping you with fitting, set up and on going years of Rover V8 motoring.

    Due to the universal fitment and multiple applications of this kit, there is no instructions included, however we are happy to offer help and advice.

Please note that we normally also upgrade the vehicles ignition system to help burn the higher octane LPG fuel, such as Magnecor plug leads and our dual timing power amp etc, please email for details.


  • Here you can see the actual Carburettor system with all components that are included.

  • Picture below offers a view of the 2WD & 4WD variant as previously fitted to a Land Rover and Rover MGB.

RPi Power Plenum

For Weber/Edelbrock 2 barrel Carburetor types. This item not only acts versatility as a Snorkel or remote Filter unit but its also the best LPG intake as well as offering enhanced torque throughout the entire engines rev range.

K&N Air Filter with power shroud

For instant power improvement and increased air flow to the engine we designed this unique K&N, LPG induction Air Filter kit. Especially for LPG, to ensure maximum engine power without engine hesitation or backfiring as would be normal from using a K&N type filter alone. It uniquely includes our bespoke Stainless Steel filter shroud offering the minimal partial restriction to air intake. This combination gives excellent performance gains on both LPG and petrol along with improved fuel efficiency and throttle response. As you can see it not only works perfectly but it looks great too.

LPG Change over switch with LPG level gauge

The LPG switch for a carburettor'd engine has three positions/modes, Petrol, petrol run out and LPG. The modes petrol and LPG are self explanatory, the reason for the petrol run out mode is that when changing from petrol to LPG you have to run your float bowls out of petrol before switch to LPG. When on LPG though you leave the switch in the LPG position so that the engine starts and runs on LPG. There is a level gauge using LED's on the switch which is controlled by the float in the LPG tank.

OMVL tandem vaporizer.

A vaporizer is the component located under the bonnet and linked directly to the LPG tank with a copper pipe via a fuel solenoid/filter. The copper pipe from the tank supplies liquid LPG to the vaporizer, and then, as the name suggests, the vaporizer changes this liquid to a vapour ready for the engine to burn. The vaporizer is also a demand and supply valve, sucked at from the mixer ring located in the induction pipe. The harder the engine works, the higher the vacuum from the mixer ring, therefore, the diaphragm inside the vaporizer is moved further and more vapour is let through to the engine

Petrol Solenoid

When running on LPG it is not only necessary to turn the petrol pump off (assuming you have an electronic fuel pump) but also to install a petrol solenoid in the fuel pipe just before the carburettor(s). The reason for this is that if you were to simply just turn the petrol pump off there is still fuel in the pipe that could surge forwards into the carb. when you stop/accelerate. With this solenoid installed this stops the fuel from being able to do this that is left in the pipe.

LPG Solenoid and Filter

Once you have the LPG system fitted, there should be three electrical shut-off solenoids in total. One will be located on the LPG tank, there is another on the vaporizer supplied with this kit, and the third is a separate solenoid which is mounted in the supply line under the bonnet just before the vaporizer, this one contains a filter as well. All of these solenoids only become live when the vehicle is switched to, and active on, LPG, therefore, when the vehicle is running on petrol, or the ignition is switched off, the LPG system is effectively dead.

FAQ Zone

  • Is it possible to Visit Rpi. for collection, further information or for parts to be fitted.
    For sure we have many customers from all over the world, that not only visit us but enjoy our unique hospitality, as well as our in-house workshop facilities that can cater for anything from major rebuilds, restorations, engine fittings, LPG conversions. As well as drop in chipping and ignition system upgrades. Holly our Engine builder (Head Chef maybe) can always find the time to show you around the world of V8 Rover engines and explain all variants and upgrades.

  • Whats more, Now with online 'You-Tube'. videos too.
    To help give you the real feel of all we can offer, what we can achieve and the standards we aspire too we now have a space on 'You-Tube' for your enlightenment. ( to afford you a unique, real time snapshot of what you can expect from us. What's more, to see, feel and genuinely experience the passion we have for what we do and what we can do for your V8.

(See our other eBay items)

If you are paying by Paypal or are located outside of the UK, please refer to payment instructions. Please also remember our prices are inclusive of EEC VAT which can be deducted from your final bid price if you have exemption, or delivery of your item is outside the EEC states.

Summary of My Selling Policies
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Also, if you are within the EEC VAT scheme, and provide your EEC VAT registration number, then the same reduction in purchase total may apply.

Local import duties are not covered in our quotes and we advise that you check such liabilities before you place your bid if you are unsure.
Please contact/inform us if you feel you qualify for EEC VAT exemption, and, if appropriate, we will adjust your invoice to remove the EEC VAT content, plus raise appropriate export documentation if required.
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All items purchased requiring modifications, upgrades, or for the inclusion of additional stock or non stock parts, may be subject to delay, however, you will be notified accordingly.
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Contacting us:

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Our Vat number is 373 2330 72

RPi Engineering International Ltd.
Wayside Garage,
Holt Road,
NR10 3EE
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Technical specifications