In addition to the work carried out on the Standard Leadfree head, the Econotune
head features bulleted inlet guides and the combustion chambers, valves and
valve throats are modified to enhance flow and smooth combustion. The compression
ratio is also increased to approximately 9.75:1. As we do not increase the
valve or port size, the resulting high port and seat velocities produces a
broad spread of very useable power from idle to a maximum of around 4800 rpm.
This is ideal for towing, motorway cruising and good torque-y 'grunt' for
ascending hills.
The power increase at 3000 rpm is approximately 30% and the maximum power
increase is approximately 18% at 4800 rpm.
