Monday, May 14, 2012

Dyno run with new GT head

This has been a long time coming but has been well worth the wait.After waiting for Ken Bryants car to arrive from Bristol last year with a shiney GT cylinder head in the boot I have taken ages getting it fitted and running it up on the Dyno at Tim Slako's.

The graph below shows the back to back test using the new head versus the last run I did in late 2011 where I got 123rwhp. I now have 146rwhp which by any standard isn't a bad improvement for just a head swap - especially considering the old head that came off was "flowed" and had 37.75 and 31.25mm Witor valves.

Estimate flywheel bhp and torque 175bhp @ 5300 and 190lb/ft at 4200

We feel that the dyno gives a slightly pessimistic overall rwhp figure but the difference between the two runs is the obvious thing.

Previous heads power output is the fine line.

CR 10.75 - GTT 43 cam for both runs




Old head with witor valves


Gareth Thomas GTT head with 37.2mm inlets and 32.6 mm GT exhaust valves. Inlet flows around 90cfm at 0.400"-0.450" and exhaust about 64cfm (both at 10inches)


Next modification after using the car for a season or so will be to try the GT 572 cam which uses the Le Mans inlet profile and should add some more top end to give around 200 flywheel hp at 6000rpm. I'll probably wait untl I have forged pistons installed before running this cam with the recommended 11.3 CR

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