In Stock


( £120.83 EXC VAT )

A unique design of adjustable simplex timing gear for full-race use. Machined from 7075 aerospace alloy with extra lightening by the way of large arched slots.

At just 650 grams complete, the simplex adjustable vernier aims to be the lightest cam timing chain setup possible for full race use. It is adjustable using a dowel with multiple locating holes at one degree increments. 

The timing gear set comes as standard with:

  • IWIS high quality timing race chain
  • 2x Allen countersink screw for the engine plate
  • 3x Allen cap screws and spring washers to mount the camshaft triangle

Which cam timing setup is best?
The choice comes down to personal preference and usage. As a general rule we'd recommend the following:

Steel/alloy vernier duplex - High mileage road car, trackday and competition, 1.35kg.   
All-alloy vernier duplex - Weekend road car, trackday and competition, 0.9kg.
Alloy simplex race - Trackday and competition, 0.65kg.

By nature, the steel outer teeth of the steel/alloy setup are better suited to higher mileage applications. The all-alloy type teeth are machined from a tough 7075 aerospace aluminium and will withstand vigorous use, however, so many are used effectively on the road. 

Is lighter better?
The simplex type is aimed at race engines where every last gram matters, but we would not recommend this for regular road use. The lighter the rotating components in a racing engine, the faster it will be able to accelerate to its peak power band high up in the rpm range. On a standard or mildly tuned road car that's less of a concern.  

Do I keep the tensioner?
No, the MED vernier is designed to run without the standard chain tensioner.

What should I torque the fixings to?
The camshaft lock nut should be torqued to 70 lb.ft with the locktab in place.

How about the belt drive conversion?  
The belt drive conversion aims to reduce potentially damaging harmonics in the valve train and is considered to be the ultimate setup by many. We fit and use all types of cam timing setups in our engines and kits.