SU Carbs - Connection, HIF type

Although there are a number of different versions of the HIF type carb, they all essentially share the same type of connection layout.

The diagram below depicts the most common type - the connections can be on either the right hand side (as illustrated below) or the left hand side. Some have the connections shared on either side. Whichever, the port functions are the same. It isn't essential the crankcase breather pipe be connected - you really don't want that choking crap from the crankcase spoiling your nice, fresh, fuel-rich incoming mixture - but it's obviously essential to block the port off if you don't. A blob of RTV Silicone is sufficient in most cases. To adjuster mixture - screw the adjuster in to richen, out to weaken. There may be a 'anti-tampering' cap in there on some carbs - just hook it out.

SU Carbs - HIF, a more finely honed instrument

Modern technology continually sweeps its ever-growing arm across all manufactured products and the SU was no exception. From closer scrutiny, and more demanding emissions control the HIF variant was born. So what have they done to improve it over its predecessor - the HS - and is it worth hanging out for? PROS. Integral float - the 'IF' in the new type number HIF. The previous H and HS type carbs with their side-mounted remote float bowls worked fine until used in racing where serious cornering speeds generated enough G-forces to lean-out the fuel mixture. The remedy was to fit a spacer between the float lid and float bowl to raise the fuel level held in it. OK when running, but at idle and rest, fuel would bubble out of the jet - causing bore washing, poor pick-up, and horrendously rich CO mixtures at idle! Fitting the float integral with the carb, directly below the jet hole (port/orifice), eliminated this problem. Jet temperature compensation - This was first aired on HS types

C-AHT770 & C-AHT770A Inlet manifold information

These single SU carb manifolds were developed to provide optimum airflow and air speed for the vast majority of road-used cars. The development program saw a significant increase in efficiency following production to the point where they are the best 'off the shelf' manifolds on the market for a majority of applications, including motorsport where only a single SU is allowed, yet not at extreme expense since sand casting methods were employed to keep costs down.

C-AHT770 & C-AHT770A

These single SU carb manifolds were developed to provide optimum airflow and air speed for the vast majority of road-used cars. The development program saw a significant increase in efficiency following production to the point where they are the best 'off the shelf' manifolds on the market for a majority of applications, including motorsport where only a single SU is allowed, yet not at extreme expense since sand casting methods were employed to keep costs down.

C-AHT772 (3.75”, C-AHT773 (5”), C-AHT774 (6”) WEBER INLET MANIFOLD KIT

Build the manifold up before fitting to the car. The two spherical ended joints screw into the inlet manifold using the flat washers and nuts to lock them into place. The 5/16” rod is a tight fit into the two joints and care must be taken when fitting. The two linkage brackets fit either end of the 5/16” rod outside of the spherical joints using the 5mm nut and bolt to secure. Fit the small rose joints either end of the threaded rod and fit to the throttle linkage on the side required for the Weber carb being used. The 5” metal bar fits in a vertical position to the manifold, secured on the original manifold studs when fitting to the engine.

2015 Rallye Monte Carlo Historique – Summary

Top Mini Best British finisher 1st International Rally Drivers Club Team car (Tyresoles Trophy) 2nd Class for 1962-65 cars up to 1300cc 59th overall out of 320

Manx Rally 2022

Historical Article - Nov 1991 - Richard Mansfield's Twini Mini

Our customers car is a 1962 Austin Mini, which originally cost £250.00 and now looks absolutely standard and truly immaculate. Only when you look inside do you realise it is a car with a difference. Richard has already restored two Coopers to a very high standard and his criterior on the Twini was to use as many secondhand production car parts as possible to keep the cost down.

Historical Article - Nov 1991 - Richard Mansfield's Twini Mini

Our customers car is a 1962 Austin Mini, which originally cost £250.00 and now looks absolutely standard and truly immaculate. Only when you look inside do you realise it is a car with a difference. Richard has already restored two Coopers to a very high standard and his criterior on the Twini was to use as many secondhand production car parts as possible to keep the cost down.

Historical Article - April 1994 - Monte Mini - Preparation

The Monte Minis were entered in the 1300cc Group A category, which demands stringent safety requirements and a minimum weight of 760kgs. Our Mini weighed 760kgs prior to a full removal of all sound deadening material. The new homologated multi point roll cage from Safety Devices was fitted. This is not a job for the average enthusiast.

Historical Article - April 1994 - Monte Mini - Preparation

The Monte Minis were entered in the 1300cc Group A category, which demands stringent safety requirements and a minimum weight of 760kgs. Our Mini weighed 760kgs prior to a full removal of all sound deadening material. The new homologated multi point roll cage from Safety Devices was fitted. This is not a job for the average enthusiast.