Range Rover Classic Inlet Manifold Fittings - V8 (Carbs)
Two makes of carburettor are fitted to the Range Rover as standard equipment: the Zenith 'Stromberg CD175' - used exclusively from 1970 to 1986 - and the 'SU HIF' which was fitted for a short period (alongside the Stromberg) from 1986 until carbs were replaced by fuel injection
The most obvious visual difference between the two types of carb is the dashpot; Strombergs having a very stubby dashpot with the 'Zenith' name cast into it, while the SUs have a much taller dashpot without any markings.
Electronic Fuel injections
Electronic fuel injection (Efi) replaced carburettors for Vogue models in October 1985, and for all V8 4-door models from November 1986, giving a substantial power increase without significant changes to the engine. There are two types of Efi systems fitted to the Range Rover:
The first system - Lucas L-Jetronic - uses an airflow meter, inside which is a hinged flap that measures, by deflection, the flow of air into the engine, thus varying the voltage signal to the ECU.
The second system - introduced to coincide with the 'new' 3.9 litre engine in 1988 but also fitted to some 3.5 litre engines - incorporates a 'hotwire' air metering system, which contains no moving parts. Instead, it employs two sensor wires - one of which is heated - to measure air mass as it passes over the wires and into the engine. A voltage signal is then sent to the ECU proportionate to the voltage required to maintain the temperature of the heated wire as it is cooled by the air flow.
The flap type, fitted to the first 3.5 Efi (non cat' equipped) models from 1986, is similar (though not identical) to the system fitted to the Rover SD1 Vitesse from the same time. The hotwire type, fitted to later 3.5, 3.9, & 4.2 vehicles (with or without cat's) despite appearing quite similar, share few parts with the flap type system.
The first diesel-powered Range Rovers left the factory in April 1986, fitted with the Italian VM 2.4 litre turbocharged engine. Subsequently, the larger 2.5 litre VM unit, followed by Land Rover's own 200 & 300 Tdi engines, were fitted. There have also been numerous diesel conversions carried out over the years, including some factor kits. However, the parts listed under Diesel Fuel Systems Components apply only to factory-built diesel vehicles.
4 Barrel Carbs
Finally, we offer a choice of conversion kits for V8 Range Rovers (carb or efi, all engine sizes):
Holley carb. Based on the legendary Holley carburettor. The kit includes a 390cfm 4 barrel Holley carb, with vacuum secondaries and electric choke, an Offenhauser inlet manifold and choke cable kit and full instructions.
Edelbrock Performer. A 500cfm 4 barrel carb kit, complete with all necessary components, which is designed to improve performance and economy. Performer carbs also feature a bright finish which enhances the appearance of your engine. Both carbs are ideal for on & off roaders and are suitable for any engine size.
Carb Identification - Stromberg CD175 & SU HIF.
Both makes of carburettor have a silver tag - stamped with an identification number - which is attached to the carb by one of the dashpot retaining screws.
(note: both RH & LH carbs have the same number but with an R or L suffix as appropriate). However, if the tag is missing, the engine number will help you to identify the carburettors, providing they have not been replaced by a previous owner. (For detailed information & specification of engine numbers, please refer to the 'V8 ENGINE' section on page 12).
Carburettor Care & Overhaul
Fuel economy and performance can suffer with insufficient carb maintenance, and with the tightening of the MOT regulations regarding exhaust emissions it is more important than ever that the fuel system is maintained in good working order. Incorrectly adjusted or worn carbs can also cause overfueling and 'bore-wash', resulting in excessive oil consumption.
It is quite straightforward (with the help of a workshop manual) to service and overhaul yours carbs, using the service items listed in this section.
The listings for complete carburettors are for identification purposes only. They will also show if you have the correct type of carbs fitted. Part numbers, tag numbers & engine numbers are quoted to help identify the original factory specification. However, these numbers relate to carburettors fitted when the vehicle was new, and not to subsequent replacements.