History of the Chevrolet-Coswrth IRL engine
http://www.cart.com/content/photos/2...0528P_0003.jpg
Ironic thing is this enegine was developed at the request of Chris Pook * (see note) for CART's 2003-2005 engine formula. Cosworth thought they could make an IRL and CART compatable engine, as TRD and Illmor intended to do, as did Judd. CART reversed course in July last year, so Illmor and TRD engines became IRL exclusive, Cosworth was shelved and Judd, less far along the devlopment and without an IRL partner sued CART.
When re-unification talks broke down Pook went hardline and accepted Forsythe's spec proposal, which was also supported by Cosworth's Bisco who did not have Ford backing at the time. It was designed to cut costs and allow Cosworth to get some funding. Had Cosworth been forced to develope the engine on their own, CART leases would have run in the millions per car. Chevrolet now is paying that devlopment cost.
Here is the press release of the Gen IV Chevy ... er make that Cosworth XF from CART.com last year (note Bisco expected Toyota/TRD to be in CART)
http://www.cart.com/News/Article.asp?ID=3401
* Pook claimed he was secretly telling Cosworth the turbo spec engine would be the engine; in reality Gerry Forsythe, who is very close to Ian Bisco, and who defused the Pook-Cosworth spat last month when the Chevy deal surfaced, is the real man behind CART's spec engine formula. He talked Pook into it after a long running conversation (another Robin Miller article which I'm looking up documents this).