Dual Carburetor Set EMPI HPMX 40mm

Dual carburetor set EMPI HPMX 40 mm.
VW Beetle engines (dual port).

The original Type 1 engine of our air-cooled VW with a single carburetor is a deliberately simply-built engine. The engine had to be cheap to produce, reliable and easy to maintain. An essential limiting factor of the Type 1 engine in terms of power and torque is the single-carburetor design. This is ideal for keeping costs down and the engine reliable, but at the same time this design means the efficiency of the engine is not very good. On the newer Type 3 and Type 4 engines this concept was modified and efficiency improved; these were fitted with dual carburetors or one carburetor per two cylinders.

Over the years there have been a whole range of alternatives on the market, from single carburetors on the left to a dual carburetor in the center, but by far the most popular and most efficient carburetors are the two side-mounted dual carburetors. In effect you have four carburetors, one for each cylinder. The advantage of dual carburetors over single carburetors is that all cylinders receive the same amount of mixture at the same time. In addition, the mixture flow is only slightly changed in direction, which is a considerable advantage for filling the cylinders. These carburetors are therefore particularly suitable for high-performance engines. A disadvantage is that these carburetors need more tuning. The best-known dual carburetors are the Weber IDF and the Dellorto DRLA.

In recent years a new player has established itself on the market, namely the HPMX carburetor. It is marketed by EMPI and sold as a complete package including manifolds, air filters, linkage system and mounting parts. The set is a cheaper alternative for those who want to use the advantage of dual carburetors and buy something with a good price-performance ratio. Independent tests repeatedly prove that the effectiveness of the HPMX has surpassed that of Weber - the reproduction is better than the original.

In the 40 mm version for Type 1 engines two types are available, the standard set and the Ultra set. The Ultra set is fitted with heavy aluminum air filters and a throttle linkage set, and the manifolds have a slightly larger offset than the standard set. Up to 1800cc the 40 mm version is usually sufficient; above that it becomes interesting to choose the 44 mm version.

Note: On Type 1 engines the fan shroud must be modified to avoid the carburetors hitting; better to order a new fan shroud directly in our shop, developed for this purpose.

All sets consist of the following parts:
- 40 or 44 mm HPMX carburetors
- air filters
- intake manifolds
- fuel hose
- gaskets and mounting parts
- fitting instructions
- bracket to change the position of the ignition coil (only for Type 1 sets)
- throttle linkage system