Atomic Vernier Adjustable Sprocket kit ( Cam Gear) - Ford XR6 BA/FG

he VCT sprockets can be troublesome over time as wear and tear takes its toll on the mechanism.

Another problem with the factory VCT sprockets is that when performance enthusiasts make changes to valvespring pressure, oil pressure, rev limiters, etc these changes can play havoc with the factory sprocket’s operation, which often brings about tuning and fault code logging issues.

Proficient tuners know that accurate cam phasing is critical to extracting maximum power from a given powerplant, so we designed and manufactured adjustable cam sprockets to allow tuners to maximise the VE of their engine combination. Another advantage of our vernier sprockets is that it eliminates the

requirement to retain the original Ford ECU and harness when transplanting a Barra engine into other vehicles. Very few aftermarket ECU’s can control the variable cam function effectively, so with this requirement eliminated a whole world of possibilities of retrofitting the DOHC engine to earlier vehicles becomes available to the enthusiast.

Our 4^th iteration (circa 2022) vernier sprockets are CNC machined from 4140 chrome moly steel with the outer section of the DOHC sprockets gas nitrided for maximum durability. The hub is made from hi tensile 6061 T-6 heat treated alloy and anodised for appearance. We supply a custom made 30mm diameter Belleville style washer to provide maximum clamping force by the M10 camshaft bolt (also supplied in the kit).

Secured together by 6 hi-tensile flange head bolts, timing adjustment is quite simple due to the degreed markings on the hub. A full 24 degrees of movement is provided, allowing the professional engine builder a huge scope of adjustment.

Click here to view more on our Vernier cam drives and components

Maximum preload of .75mm (.030") recommended for street use.