12th October 2013

Isle of Man TT reverts to 'Open Class' regulations for 2014 sidecar races

Post in Isle of Man TT News

Following extensive consultation and feedback from sidecar teams and competitors, the Isle of Man TT Races Organisers and Promoters have elected to return to 'Open Class' regulations for the 2014 Isle of Man TT Sidecar Races.

The regulations will be similar to those that were in place for the 2011 TT Races and will allow competitors to run tuned engines. The original amendment was introduced in an attempt to reduce costs for competitors but research has shown that teams have not significantly reduced operating budgets by the restrictions.

Gary Thompson, ACUE Director and TT Races Clerk of the Course commented:

"With any motorcycle racing event or series of the stature of the Isle of Man TT, rules and regulations are constantly under review and Promoters and Organisers need to adapt regulations according to the changing circumstances."

The Sidecar Class for TT 2014 will run technically as below:

The only permitted engines for this class are:
501 – 600cc, 4 stroke, 4 cylinder, Production based
Rotary engines are not permitted.
Over-boring is not permitted.

Induction systems:
501 – 600cc, 4 stroke: Any carburettor is permitted.
501 -600cc four-stroke Fuel injection engines: Fuel injection systems are permitted using only the
throttle-bodies as homologated for the engine concerned.
The injectors must be standard units as on the homologated engine.

Bell mouths, intake tract devices (Velocity stacks, air funnels) may be modified or replaced.
Butterfly cannot be changed or modified. Where fitted a secondary butterfly or slide may be locked in
the fully open position.
Any fuel pump may be used.
Homologated fuel pressure must remain unmodified.
The fuel ignition ECU and Ignition Control Unit may be changed.
The camshaft duration is free but the lift must remain as homologated.
The cam chain or cam belt-tensioning device is free.
Cam sprockets or cam gears may be modified or replaced to allow the timing of camshafts.


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