TECHNICAL SPEC
Engine:
2.5 ltr Alloy Engine
Naturally Aspired (non-turbo)
Ford Cosworth YB.
• Increased capacity 2 litres to 2.5 litres
• Alloy Block 10mm taller on deck height
• 96mm bore
• 88mm stroke
• Motec engine management
• Slide throttle 4x400cc injectors
• Dry sumped
Performance:
332 bhp @ 8000rpm
250 ftlbs @ 5800rpm
Engine on the dyno
The above graph shows the results from the dyno test.
The top line shows
bhp
The bottom line show torque
Andy Williams Ford Sierra Sapphire Cosworth in action at Brands Hatch.
JEMS – Taking the YB Engine to new levels
This engine, used in the Sierra of Andy Williams, is one of the first in the country to deliver this very wide power band with increased capacity and light weight. The engine utilises an alloy block 10mm taller on deck height and all engine parts are custom made including cams, valves, springs, followers, pistons and rods.
Andy races in the BOSS (Blue Oval Saloon Series) and Welsh Saloon and Sports Car championships in his Sierra Sapphire Cosworth, built and previously raced by JEMS Race Engineerings Jon Edwards. This car is very light weighing only 940kg.
The images below show this engine being built in the JEMS engine room, on the dyno where the engines huge power was realised and installed in the car.
The very wide power delivery produced by this engine combined with its light weight make it a particularly good engine for rallying. If you would like to know more about this engine contact Jon Edwards, click here for contact details.
The
YB parts laid out in the engine room prior to build.
The
engine being built, crankshaft in place.
Engine
ready to receive the head.
Engine
nearing completion in the build room.
After
a successful dyno test (see side bar) the engine is installed in Andy’s Sierra.