THE DELLORTO VHSH 30 CARBURETOR

TKART Staff

10 March 2021

CIK-FIA

HOMOLOGATION
The DELLORTO VHSH 30 carburettor is CIK-FIA approved and is used in various national and international competitions including the KZ and KZ2 classes, ROK single-brand trophies, and, in Italy for example, in the national Pro-driver Under and Over classes.

FLOAT BOWL

TYPE
Carburetors are divided into two distinct types: those with a float bowl (also called "needle") and those with a diaphragm. In this case the air flow is regulated by the opening of the fuel valve while the main petrol flow depends on the ascent of a conical pin.

GUILLOTINE

VALVE
The VHSH 30 has a flat valve that closes or opens the diffuser duct according to the position of the accelerator.

DIE CASTING

PRODUCTION
The VHSH 30 is made of aluminium by a die-casting process. The raw piece is subsequently machined with numerically controlled CNC machines that uniform the diffuser profile and make it smooth. A hand-polished variant with diamond paste and felt is also available.

30 mm

DIAMETER
The VHSH is supplied in one size with a 30mm diffuser.

The carburetor is one of the most important elements of a kart. In fact, as powerful as the engine may be, it is the air/petrol mixture which enters the combustion chamber that determines the performance of a vehicle. After analysing the operating principle of the float bowl/needle type in the "Technique" section, we decided to dedicate an article in our "Under examination" section to one of the most popular float bowl carburettors in karting, the DELLORTO VHSH 30, discovering its history and the technical solutions that characterise it.

The DELLORTO VHSH 30 is a needle carburetor invented a few decades ago. Over the years it has been developed not so much with the aim of achieving ever greater performance, but rather with the intention of providing various customers with a product capable of adapting to various needs. In fact, thanks also to the considerable adjustments available, this carburetor is a real compromise between the racing world and that of series production. Its most recent ancestor is the VHSA, but its true origins can be traced back to the PHBE 30 racing carburetor. It was a needle carburettor made of Electron, a metal alloy of magnesium and aluminium, with an easily recognisable round valve made of aluminium. for the treatment of olive green surfaces and for its lightness. Over the years, however, a bit for fashion and a bit to reach an ever higher level of performance, needle carburetors began to be equipped with the flat gas valve.

The VHSH 30 is supplied in two variants which only differ in relation to the final processing. In fact, the one on the right has undergone a hand polishing process with felt and diamond paste.

The PHBE 30 made of Electron, from which the VHSH 30 is derived, is easily recognisable by the olive green treatment of the surface. It weighed only 500 grams, about 150 less than the VHSH 30.

The VHSB (widely used in the Rotax classes) is the big brother of the VHSH with which it shares the whole part of the bowl. The upper part is not interchangeable because the VHSB starts from a minimum size of diffuser with a diameter of 34 mm up to 39 mm. In the photo, a VHSB not intended for karting use with a surface treatment that gives it a dark colour.