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Rover V8 Engine Fuel System (Carbs)
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Page Contents
Introduction
Carb Identification
Inlet Manifold Fittings - Carbs
Carburettors & Carb Components - SD1 & TR8
Carburettor Components - Range Rover
4 Barrel Carb Conversion Kits
4 Barrel Carb Components
4 Barrel Air Cleaners
K & N 4 Barrel Air Cleaners
Introduction
Carbs
Though various other carbs have been used from time to time, by far the most common carburettors to be found supplying fuel to the Rover V8 are Zenith Stromberg CD175s and SU HIFs.
Chosen for their combination of economy, low emissions and simplicity of operation (plus, of course, availability in large quantities), they are an excellent choice. Nevertheless, the SUHIF6 with manual choke, as fitted to SD1 3500 saloons from 1976 to 1981, is probably the most popular, due to the fact that it can be “tuned” to suit other engine upgrades.
Efi (Electronic Fuel Injection)
Electronic fuel injection first appeared on production Rover V8 engines as early as 1977, bound for the emissions sensitive Australian market. Subsequently, it was fitted to TR8s and Rover SD1s sold in North America. However, these early systems were designed specifically to meet emissions requirements; it was the Rover SD1 Vitesse, introduced in 1982, that boasted the first efi system designed to increase power output. Vitesses produced 190bhp from a 3.5 litre engine which was otherwise largely similar to the carburettor version, producing 155bhp.
Three years later, in October 1985, the Range Rover V8 followed suit: efi replaced carbs for Vogue models initially, and for all V8 4-dr models from November 1986.
There are two basic types of efi system fitted to the Rover V8. Similar in operation, they both use solenoid injectors - one per cylinder - operating directly into the inlet ports. They both respond to information from sensors relating to temperature, throttle position and engine speed, but neither has any control over ignition. The differences between the systems are as follows:
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 - Range Rover/Discovery only, 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 earlier type, which was fitted to the first 3.5 efi (non cat'- equipped) Range Rovers from 1986, is similar (though not identical) to the system fitted to the Rover SD1 Vitesse, the main difference being the ecu (electronic control unit). The hotwire type, fitted to later Range Rover 3.5, 3.9 & 4.2 vehicles (with or without cat's), despite appearing quite similar, shares few parts with the flap type system.
Twin plenum injection
Twin plenum, or twin-throttle plenum injection, was a variation of the Lucas-L system, produced for a short period in the mid 1980s. It was intended primarily for the Group A racing Vitesses being campaigned by BL Motorsport, but found its way onto a small number of production Rover Vitesses for homologation purposes. In road-car form, it is similar to the single-throttle type in every way except for the plenum chamber and associated air inlet trunking. Of the parts that are different, most are now unavailable.
Holley & Weber 4 barrel carbs
Finally, we supply two 4 barrel carburettor conversion kits for the Rover V8 engine (carb or efi, all engine sizes):
1. The legendary Holley 390cfm carburettor. The kit includes a 390cfm 4 barrel Holley carb, with vacuum secondaries and electric choke, an Offenhauser inlet manifold and choke cable kit, chrome plated pancake filter kit and full instructions.
2. The Weber 4-barrel carb kit. The kit includes a Weber 4 barrel 500cfm carb (bright finished), complete with Edelbrock Performer dual plane inlet manifold, chrome plated pancake air filter kit and all gaskets, cables and instructions for fitting.
Ideal for on or off road, these replacement carbs both represent good value as performance upgrades. Use them on their own or, for maximum benefit, in conjunction with our Performance cylinder heads, uprated camshafts and stainless steel tubular manifolds. They work just as well (or better) with larger capacity engines and are the perfect solution for limited under-bonnet space, as with TR8 conversions.
K&N Filters
We also supply a range of K&N Air Filters for most applications including 4-Barrel pancakes. Refer to separate panel for details.
Carb Identification
In order to select the correct parts, this section will help to identify the type of carbs fitted to your engine. It is for identification purposes only.
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).
ROVER SD1
All Rover SD1 3500 saloons from 1976 to 1981 were equipped with a pair of SU HIF6 carburettors with a manual choke. The tag number on these carbs is FZX1316R (right hand carb) or FZX1316L (left hand).
From 1982 until 1985, SD1 3500 carb engines were fitted with Stromberg CD175 carbs, incorporating a FASD (Fully Automatic Starting Device) on the side of the left hand carb.
Easily identified by its blue plastic cover, the FASD is essentially a cold-start enrichment device.
Stromberg carbs have a stubby dashpot, compared to the SU’s taller version.
Finally, from 1985, the SUHIF6 was again fitted to some 3500 models. However, these were not the same carbs as the earlier ones, being considerably more complex in their coldstart enrichment operation. The tag numbers for these carbs are FZX1456R & L.
TR8
Original carb TR8s are fitted with a pair of Stromberg 175CDSET carbs, with an automatic choke.
RANGE ROVER
Two makes of carburettor are fitted to Range Rovers 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 stubby dashpot with the 'Zenith' name cast into it, while the SUs have a much taller dashpot without any markings.
| Stromberg CD175
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| Vehicles from 1970 to 1896 |
| Non Detoxed Engines - |
| Engine Number |
Tag Number |
| 355 suffix C, D & E |
3712 |
| 355 suffix F - |
|
| 3550000F to 35542952F |
3881 |
| 35542953F onwards |
3915 |
| 13D & 18D |
3915 |
| Detoxed Engines - |
| 341 & 359 - |
|
| Suffix A & B |
3318 |
| Suffix C & D |
3677 |
| Suffix E |
3887 |
| Suffix F |
3854 |
| 34183127F |
3999 |
| 398 |
3881 |
| 11D, 15D, 16D, 17D & 19D |
4104 |
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| Stromberg CD175
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| Vehicles from 1986 onwards |
| Non Detoxed Engines - |
| 28D & 29D |
4185 |
| Detoxed Engines - |
| 26D & 27D |
4187 |
| 30D |
4186 |
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| SU HIF
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| Vehicles from 1896 onwards |
| Non Detoxed Engines - |
| Engine Number |
Tag Number |
| 28D & 29D |
FZX2006 |
| Detoxed Engines - |
| 26D, 27D & 30D |
FZX2005 |
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Inlet Manifold Fittings - Carbs
All parts listed are suitable for saloon, sports and 4x4 applications unless otherwise stated.
Inlet Manifold - carburettor;
SD1
1976 - 1982, SU Carbs - (1) - ERC5484
1982 on - Stromberg Carbs
All Except Engine Nos. 34A & 36A - (1) - ERC5950
Engines 34A & 36A - (1) - ERC9900
TR8 - (1) - ERC5484
Range Rover
Please contact our sales department for price & availability of Range Rover inlet manifolds.
Bolt - inlet manifold;
All engines.
3/8" UNC x 1 1/8" - (9) - BH506121
3/8" UNC x 2" - (3) - BH506161
Washer - manifold bolt - (12) - 2204
Gasket - inlet manifold;
All models.
Tin - (1) - ERC3990
Composite - (1) - ERR7306
End Seal - manifold gasket;
For Tin Gasket - (2) - AJM645
For Composite Gasket - (2) - ERR7283
Clamp - end seal - (2) - 602076
Screw - seal clamp - (2) - 602236
Thermal Transmitter - (1) - 545010
Located behind thermostat (when fitted).
Gasket - thermal transmitter - (1) - 236022
Non-Return Valve - brake servo;
Not Range Rovers with ABS.
Carb Models - (1) - ADU1402
Efi Models - (1) - RTC5907
Washer - non return valve - (1) - 232043
Heater Outlet - rear - (1) - 603440
Where fitted.
Gasket - rear heater outlet - (1) - 603441
Temperature Sender Unit - coolant;
Located at front of inlet manifold - all engines.
Carb Models
Air Con - (1) - PRC6317
Non Air Con - (1) - GTR108
Efi Models
3.5 Litre
Air Con - (1) - PRC6317
Non Air Con - (1) - GTR108
3.9 Litre - (1) - PRC7918
With & without air con.
Washer - temperature sender unit - (1) - 90568054
Thermostat (suitable for all engines);
74° - (1) - ETC4761
82° - (1) - GTS104
88° - (1) - GTS106
Gasket - thermostat;
Rover P6 type - (1) - GTG116
With thermostat bypass in housing.
SD1/TR8 - (1) - GTG125
Range Rover
Early Engines - (1) - 610387
Pre 1976.
All Other Engines - (1) - ERR2429
Thermostat Housing;
Saloon/Sports
Standard Type - (1) - RB7211
Aluminium.
P6 type
With integral bypass pipe. Suitable for Offenhauser manifold.
Steel - (1) - RB7322
Chromed - (1) - RB7436
Range Rover
Without Electric Fan Switch
Engine Nos. 341, 355, 359 Only - (1) - RB7322
All Other Models - (1) - ERC2139
With Integral Electric Fan Switch
For air con fans. Switch not included.
Air Con - (1) - ETC6135A
Non Air Con - (1) - ETC4596
Fan Switch - thermostat housing - (1) - PRC3505A
Range Rover.
Washer - fan switch - (1) - C457593A
Carburettors & Carb Components - SD1 & TR8
Carburettor;
SU - HIF6 (SD1)
1976 - 1981
RH - (1) - FZX1316R
LH - (1) - FZX1316L
1985 onwards
RH - (1) - FZX1456R
LH - (1) - FZX1456L
Stromberg CD175
SD1 1981 onwards
RH - (1) - ERC5991
LH (with FASD unit) - (1) - ETC4714
TR8
US federal spec
RH - (1) - ERC2105
LH - (1) - ERC2104
US California spec
RH - (1) - ERC3432
LH - (1) - ERC3433
Gasket (carb mounting);
SUs - (4) - ERR4381
Stromberg - (4) - ERR4381
Insulating block (carbs) - (2) - ERC1102A
Carb Components - SU HIF6 - 1976 to 1981
Piston Spring - (2) - AUD4398
Metering Needle - (2) - CUD1109
Needle Guide - (2) - AUD4288
Throttle Spindle - (2) - WZX1170
Float Needle & Seat Kit - (2) - WZX1100A
Float;
RH - (1) - WZX1509A
LH - (1) - WZX1510
Main Jet;
RH - (1) - WZX1453A
LH - (1) - WZX1452A
Gasket Set - (2) - WZX1505A
Seal Kit - (2) - RTC6072
Carb Components - SU HIF6 - 1985 On
Piston Spring - (2) - AUD4398
Metering Needle - BFW - (2) - NZX8069
Needle Guide - (2) - AUD4288
Float Needle & Seat Kit - (2) - WZX1097
Float - (2) - WZX1509A
Main Jet - (2) - WZX1453A
Gasket Set - (2) - WZX1505A
Seal Kit - (2) - RTC6072
Carb Components - Stromberg CD175
Piston Spring - (2) - 516946
Metering Needle (TR8 only);
USA Federal - (2) - AAU7220
USA California - (2) - AAU7268
Diaphragm - (2) - JS499A
Needle Valve - (2) - BHM1075
Float & Arm Assembly - (2) - 605833
Gasket Set - (2) - RTC1481A
Service Kit - (2) - AAU7222
Float - (2) - WZX1509A
Carb Adjusting Tool - Stromberg - (1) - RX1222
TR8 & SD1 only - not suitable for Land Rover applications.
Carburettor Components - Range Rover
Stromberg CD175 - 1970 to Oct 1985
Diaphragm - all models - (2) - JS499A
Spring - diaphragm - (2) - 606792
Gasket Kit;
Carbs 3712, 3915 - (2) - 605857
All Other Carbs - (2) - RTC1481A
Metering Needle - non detoxed vehicles;
Carbs:
3712 - (2) - 606792
3881 - (2) - AAU8231
3915 - (2) - AEU2462
Metering Needle - detoxed vehicles;
Engine nos. 341, 359 - 8.13:1 CR.
Carbs:
3318 - (2) - 90608276
3677 (BIDF) - (2) - AAU1488
3677 (BIFF) - (2) - RTC4776
3887 - (2) - AAU8229
3854 (BIEJ) - (2) - AAU8230
3854 (BIFF) - (2) - RTC4776
3999 (BIFC) - (2) - AEU1850
4104 - (2) - AEU1851
Needle Valve;
Carbs:
3712 - (2) - AAU4547
3881 & 3915 - (2) - RTC1482
3318 - (2) - AAU4547
3677 - (2) - AAU4547
3887 & 3854 - (2) - RTC1482
3999 - (2) - RTC1482
4104 - (2) - RTC1482
Float (all models) - (2) - 605833
Temperature Compensator - detoxed engines;
Carbs:
3318, 3677, 3887 & 3854 - (2) - 90608271
3999 & 4104 - (2) - AAU7900
Throttle Disc;
Carbs:
3712, 3881 & 3915 - (2) - 605800
3318 - (2) - 597770
3677, 3887, 3854 & 3999 - (2) - AAU1489
4104 - (2) - AEU1848
Damper & Oil Cap - all models - (2) - 518432
Cold Start Assembly;
Carbs:
3712 & 3915 - (1) - 606810
3318 & 3677 - (1) - 608282
Vacuum Switch - (1) - 614361
Detoxed engines.
Fuel Trap - (1) - ERC2042L
Detoxed engines.
Stromberg CD175 - 1986 onwards
Diaphragm - (2) - JS499A
Spring Diaphragm - (2) - 606792
Gasket Kit - (2) - RTC1481A
Service Kit - (2) - AAU2967
Kit includes: needle valve, diaphragm, float gasket and seals.
Metering Needle;
Carbs:
4186 - (2) - AEU1851
4187
TO VIN 162496 - (2) - AEU1851
VIN 162497 onwards - (2) - RTC4774
4185 - (2) - AEU1850
Needle Valve - (2) - RTC1482
Float - (2) - 605833
Temperature Compensator - (2) - AAU7900
Throttle Disc - (2) - AEU1848
Damper & Oil Cap - (2) - 518432
Fuel Trap - (2) - ERC2042L
SU HIF from 1986
Engine numbers with a 'C' suffix.
Seal Kit - (2) - RTC6072
Gasket Kit - (2) - WZX1505A
Metering Needle;
Carbs:
FZX2005 - (2) - NZX8077L
FZX2006 - (2) - NZX8076L
Jet Assembly;
RH - (1) - CUD2785L
LH - (1) - CUD2788L
Needle Guide - (2) - AUD4288
Float Needle & Seat Kit - (2) - STC205
Float;
RH - (1) - LZX1600L
LH - (1) - RTC3566
Piston Ring - (2) - AUD4398
Damper & Oil Cap - (2) - LZX1505A
Fuel Trap - (2) - ERC2042L
Carb Mountings - Range Rover
Stromberg and SU carbs.
Gasket - carb to manifold - (6) - ERR4381
Insulating Block;
Carbs 3712, 3881 & 3915 - (2) - ERC1102A
All Other Carbs - (2) - ERR4383
Gasket - carb to elbow - (2) - 612435
'O' Ring - elbow to cleaner - (2) - 602634
4 Barrel Carb Conversion Kits
Suitable for all engine sizes.
Complete conversion kits for all V8 engines.
Kits include:-
4 barrel carb, inlet manifold, chromed 14" air cleaner (can be substituted with K & N air cleaner at extra cost), thermostat housing and accelerator cable kit.
See also fuel pump section for details of our Facet type electric fuel pump, which may be required in addition to the 4 barrel carb kits, depending on application.
Holley/Offenhauser Conversion;
390cfm carb with auto choke.
Kit 1 - (1) - RB7262
With 3" deep air cleaner.
Kit 2 - (1) - RB7262LOW
With 2" deep air cleaner for extra bonnet clearance.
Weber/Edelbrock conversion;
500cfm carb with manual choke.
Kit 1 - (1) - RA1323
With 3" deep air cleaner.
Kit 2 - (1) - RA1323LOW
With 2" deep air cleaner for extra bonnet clearance.
4 Barrel Carb Components
Carburettor only;
Weber 500 - (1) - RA1335
Holley 390 - (1) - RB7254
Jets - (Holley 390 - pair) - (1) - RB7254JET
Overhaul kit (Holley 390) - (1) - RB7254OH
Holley Stud/Nut/Washer Set - (1) - RB7254S
Gasket (carb to manifold) - (1) - RB7181
Holley & Weber.
Inlet manifold (4 barrel carb);
Suitable for Weber & Holley carbs.
Offenhauser 360° - (1) - RB7314
Dual plane manifold. Lowest bonnet clearance.
Offenhauser/JWR dual port - (1) - RA1336
Dual port manifold.
Edelbrock Performer - (1) - RA1337
Dual plane, high torque manifold.
Gasket (inlet manifold);
Tin - (1) - ERC3990
Composite - (1) - ERR7306
End Seal - manifold gasket;
For Tin Gasket - (2) - AJM645
For Composite Gasket - (2) - ERR7283
Thermostat housing;
Cast iron - (1) - RB7322
Chromed - (1) - RB7437
Gasket (thermostat housing) - (1) - GTG116
Accelerator Cable Kit (Holley/Weber) - (1) - RB7278
Manual Choke Conversion Kit (Holley) - (1) - RB7184
Auto Choke Conversion Kit (Weber) - (1) - RA1323ACH
Manual Choke Cable (Holley) - (1) - RB7290
4 Barrel Air Cleaners
Air cleaner kit;
14" diameter chromed 'pancake' type, complete with filter. Suitable for Weber & Holley.
Standard (3" deep) - (1) - RB7438
'Low-rider' (2" deep) - (1) - RB7439
For extra bonnet clearance.
Replacement element (air cleaner);
Standard Element
3" Deep - (1) - RB7438ELEM
2" Deep - (1) - RB7439ELEM
K & N Element
3" Deep - (1) - RB7438ELK-N
2" Deep - (1) - RB7439ELK-N
Adaptor (breather pipe) - (1) - RB7654
Air cleaner base to flame trap/breather.
K & N 4 Barrel Air Cleaners
K & N Holley & Weber 4 Barrel Carbs;
Pancake (14") filter assembly, bolts directly on to carb.
May also be fitted with 'X-stream' filter top (lid).
Recessed Type (assembly) - (1) - RA1397
Sits low on carb for extra bonnet clearance.
N.B. for use with manual choke only.
Flat Type (assembly) - (1) - RA1398
2 1/4" deep, fits either manual or automatic choke.
'X-Stream' Air Flow (lid only);
For maximum air flow. Replaces standard pancake K & N lid.
Black - (1) - RA1399BLACK
Blue - (1) - RA1399BLUE
Red - (1) - RA1399RED
Polished - (1) - RA1399POLISHED
N.B. K & N filter assembly (recessed or flat type) must be purchased separately.
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Fri, 08 Aug 2008
