Double Adjustable Shaft
QUANTUM was the first to introduce a double adjustable shaft with double needle assembly to Formula One in 1988. Our double adjustable shaft has two needles that allow directionally independent adjustment of bleed past the piston in 24 positions.
Previous generations of mono-tube shocks isolate bump and rebound adjustment with a bump canister. The problem with canisters is they only see displaced fluid — fluid displaced by the shaft — which is only a fraction of what is available at the piston.
Take our 1.625 cal. shocks as an example:
The shock body has an internal diameter of 41.275mm and the shaft is manufactured from 14mm diameter 17-4 PH precipitation hardened stainless steel3. For every 25mm of shaft travel, the piston flows a fat 29.6ml of shock fluid — whereas the shaft displaces a pathetic 3.85ml. An adjuster placed ahead of the displaced fluid — in a canister — will experience almost eight times less fluid volume than is available at the piston.
With independent adjustment of bump and rebound damping at the piston, QUANTUM BLACK double adjustable shocks are better equipped to control small shaft movements and offer superior adjustment resolution with a total of 576 possible settings.
Single Adjustable Shaft
QUANTUM BLACK shocks are also available with our single adjustable clicker shaft — with a single needle providing simultaneous adjustment of bleed past the piston in bump and rebound. Our clicker shaft assembly has a large 24-position adjuster at the base of the eyelet, clearly engraved to identify positive and negative adjustment.
Single adjustable shafts can also be equipped with a checked jet, to make them bump or rebound adjustable only, if necessary5.
Owner revalvable. By the trackside.
QUANTUM shock absorbers are gas-pressurised to prevent cavitation and provide room for the small volume of oil displaced by the shaft. The gas is kept separate from the oil behind a floating piston.
BLACK shocks feature a captive floating piston that allows the shock to be partially disassembled without requiring depressurisation. A pin spanner and vice are the only tools required to safely remove the shaft assembly — complete with piston and shaft bearing — for replacement of shims and shaft seals.
Mygale fitting pack.
Double adjustable 1.625 cal. QUANTUM BLACK shocks have been a consistent feature on every championship winning Jamun Racing Mygale since 2005 — and six consecutive British Formula Ford Championship titles has nothing to do with luck.
To suit the Mygale chassis, 1.625 cal. BLACK shocks are available with 2 inch spring hardware, Mygale design spring retainer and 7/16 inch spherical joints.
Pistons
Variations in piston geometry can have a greater influence on the shape of the force-velocity curve than the shims themselves — which is why QUANTUM has developed a range of pistons, each to emphasize unique characteristics.
Standard — Linear
Our standard piston is a symmetrical ten-port design that produces a linear force–velocity curve in bump and rebound. Both faces are dished to gently preload the shims and accentuate subtle digressive characteristics near closed adjuster settings, to emphasize low speed adjustability.
BB — Linear
The BB piston is a development of our standard piston with large diameter ports for softer damping. The increased flow area is analogous to a one step change in stack thickness.
CV — Linear
The CV piston is an asymmetrical design that has small diameter ports acting in bump and large diameter ports acting in rebound — or vice versa.
HF — Double Digressive
The HF piston is a symmetrical design that exhibits a pronounced digressive force–velocity curve in bump and rebound. The annular shim seat allows the flow to dump as soon as the stack cracks open. The bleed adjusters are used to tune the shaft velocity at which the digressive damping region begins.
SD — Single Digressive
The SD piston is an asymmetrical design, digressive in bump and linear in rebound — or vice versa. The digressive side is identical to the HF piston. The linear side has six kidney shaped ports that produce a force-velocity curve comparable to our standard piston.
