Chassis types/differences.
All Energic chassis are of heavy durable construction of welded thick steel of 6mm to 20mm in thickness depending on the load and structure area.
The Energic motoculteur G9 chassis was designed before the single platform system of the Energic motoculteur B5, C7 B4L, C7 S Bloc and later D9 S Bloc construction. The chassis was a solution to carry just one type of moteur with an OHV moteur – higher in profile. It was hand made and costly to construct in small numbers with a low production run.
The Energic motoculteur G9 chassis with the rear adaption swing arm brevette system.
From 1931 the chassis changed significantly to the single platform;
The chassis for the Energic motoculteur B1 and B5 differs from that of the early Energic motoculteur C7 B4L’s in that the cradle for the engine is curved to a far greater degree to accommodate the 2 stroke moteurs. These moteurs, by design, tended to be circular on their base, necessitating this type of chassis design.
Energic motoculteur B5 illustrating curve base chassis to accommodate moteur.
Energic motoculteur B5 illustrating curve base chassis (covered later with a flat metal plate) to accommodate the engine.
The Energic motculteur C7 B4L chassis from 1931/32 differed from that of the later Energic motculteur C7 S Bloc to accommodate the 2 different types of moteurs (both Motobécane). The Energic motculteur C7 4BL had no oil drain plug access hole on the right-hand side (viewed from the front of the machine). As oil drainage was through a different point.
Energic motculteur C7 B4L chassis stripped for restoration.
Energic motculteur C7 S bloc with float chamber oil downpipe hole cut. with service holes.
Also, the front support anchor to the chassis (for the engine and ventilation system supports) on the Energic motoculteur C7 B4L machines were original of 1 hole construction which in 1932 moved to a double holed construction. less welding in assembly and easier to replace broken parts – chassis development.
Energic motoculteur C7 B4L 1931 original 1 hole engine/fan mounting.
Energic motoculteur C7 B4L 1932+ original 2 hole engine/fan mounting.
Energic C7 B4L 2 hole engine/fan mounting.
Energic motoculteur C7 S Bloc chassis 2 hole engine/fan mounting.
The Energic motoculteur G9 didn’t use the basic platform chassis as the Energic motoculteur B5 and early Energic motoculteur C7 B4L’s – which was another reason why they were phased out in 1933. As it is important to minimize the variance in platform chassis, so you can standardize production, enabling higher output, and efficiency in production in the middle the to late 1930s.
Energic motoculteur C7 B4L chassis in all its glory!
It is true to say that the robustness of the overall chassis design, the strongest materials used and the meticulous hand-finishing has meant that these motoculteurs have survived 80+ years. This over-engineering is a credit to Mr Patissier.
Energic motoculteur C7 S Bloc chassis 2 hole engine/fan mounting.
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Read more about Energic motoculteur C7 B4L here.
Read more about Energic motoculteur D9 B5L here.
Read more about Energic motoculteur D9 S Bloc here.
Read more about Energic motoculteur C7 S Bloc here.
Read more about Energic History here.
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