The Cosworth Company's view of the EAA engine, forerunner and design genesis for the Cosworth Vega
The following was written in 1988 as a portion of the history of Cosworth Engineering as part of the company's official information package. (We have retained the original English(British) style)
The 1995cc EAA engine was based on the Chevrolet Vega block and was Cosworth's first non-Ford based stock block engine.
(Cosworth) engines had suffered reliability problems as tuners
attempted to stretch what was, basically, a 1600cc to the full two
litres, but it soon became evident that about 1840cc was the limit for
the cast iron block. Later brazed cylinder liners, then an aluminium
block, would overcome most of these problems although by now the massive
resources of the BMW organisation were being mustered to dominate the
category, thereby laying the ghost for all those FVA inspired defeats.
Munich had learned well for their challenger bore more than a passing
resemblance to its foe.
BD areas of operation have included the BDP for US midget racing with
230bhp from two litres by way of fuel injected methanol. This often
overlooked aspect of American motor sport attracts loyal devotees to
whom Cosworth have already sold over 80 engines, winning the West Coast
championship in '86. Developed by the staff of the Company's Californian
subsidiary, the BDP is continuing the theme that Mike Hall's design
really is the motor sport engine for the masses having proved itself in
a variety of arenas over the past 20 years. As the man says: "We
built up a meccano set for the BDA with everything from about 11 00cc to
two litres. People could come along and buy various bits. They still
That Mike referred to the EAA, the Chevrolet Vega, as 'the stumbling block' was perfect, for the phrase amply sums up the debacle.
extremely light compared to the BDA with its pressure die-cast aluminium
from Reynolds, but was not up to the ratings we were putting through it.
Designed to be a two litre racer, we could not make the cylinder block
live. There was nothing we could do."
the first road car to carry the Cosworth name did not enhance any
reputations. It was not the engine which was at fault, only the block,
but that tends to be somewhat critical and the whole episode fated
before it began. Hundreds of blocks were being delivered, many failing a
pressure test Cosworth devised for them and littering up the place while
a solution was found. It never was.
which passed the test were released, the first version stirring in anger
in Guy Edwards' Lola but failing to go the distance despite the
attentions of Messrs. Duckworth and Scammell at Salzburgring.
was the start of an ominous tale which resulted in the EAA never
reaching sufficient status to go into Formula 2, Tommy Reid's hillclimb
exploits heralding the greatest successes for this almost forgotten
scheme. Forgotten that is until an example was recently found in one of
Northampton's darkest corners. Perhaps it should be put on display with
the epitaph that you cannot win all the time.
it there could be the JAA/JAB 750cc motorcycle twin cylinder developed
for Norton Villiers in the mid seventies and described by Cosworth as a
'sad and sorry saga.' The least said about that the better.
down the list of Cosworth engines, the memories are again stirred by
another of Mike Hall's projects, the GAA. Based around a V6 'Essex'
cylinder block, there were about 100 of the 3412cc, twin ohc/24 valvers
made, belt driven. These became the basis of those mighty Cologne Capris
that did so much to enhance the Group 2 saloon races of the early
seventies when the likes of Jochen Mass and Klaus Ludwig fought the BMWs
for supremacy. 440bhp at under 90OOrpm made the GAA a formidable beast
and many were later installed in single seaters to take on the brutal
Chevy V8s in Formula 5000, their relative compactness and lightness
making up for any deficiency in outright power.
The EAA and Other CosworthEngines
|EAA||1972||1995cc||275 Bhp.||Chevolet Vega, Formula 2 and Sports Cars, only successful in latter, used Vega alloy block, head similar to BD series, belt drive, productionized and built by Chevy in 122 BHP for the Cosworth Vega of the 70s|
Ford "Essex" V6 Race Engine, Capri/Granada block, 4 valve twincam belt drive heads, Group 2 touring and Formula 5000, 100 kits sold by Ford Motorsports
Norton-Villiers parallel twin Motorcycle Engine, DFV-like head layout, patron hit trouble and only 30 built
Racing Version of JAA, later injected
Opel Ascona 400/Manta 400, used Opel Diesel block, 16 valve twincam for Group 4, injected for road at 140 Bhp, Webers for competition
Formula SuperVee engine, based on single overhead cam Golf
Mercedes-Benz, twincam conversion on M102 4 cylinder, originally for competition, then for road use in 190E 2.3-16
Mercedes, increased displacement for '89 model year
Mercedes, Group A short stroke '89 touring car racing
Formula 1, Turbo V6 Ford, Benetton get 1000 Bhp with fuel in '87
GM-Pontiac, Cosworth 4 valve twincam head on production block, chain drive cams, kits
Vauxhall-Opel, 16 valve twincam conversion of midrange engine, fitted to many models
Formula 1, 75 degree V8 for Benetton '89 and customers