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At July’s Sil­ver­stone Clas­sic, moun­tune Rac­ing re­turned to the scene of its fa­mous vic­tory of Rob Gravett’s Sierra Cosworth RS500 over the Andy Rouse Engi­neer­ing sis­ter car in the 1990 Grand Prix sup­port race. But there was a twist: this time, moun­tune was work­ing with the Kal­iber spon­sored ex-Rouse car, raced by Ju­lian Thomas in the JET Su­per Tour­ing Car Tro­phy. That’s right, they’re pro­vid­ing en­gines for their for­mer ri­val! But all’s fair in love and rac­ing, and 28 years of tech­no­log­i­cal evo­lu­tion means that their en­gines are pro­duced in quite a dif­fer­ent way now; whereas the race-spec YBs were at the peak of their op­er­a­tional per­for­mance win­dow back in 1990, nowa­days it’s more a case of de­tun­ing the mo­tor so that it ‘only’ pro­duces 550bhp. With mod­ern man­age­ment sys­tems and re­fined camshafts, pis­tons, rods, and a mul­ti­lay­ered steel head gas­ket, moun­tune are hav­ing to re­duce boost pres­sure to get power down to 1990 lev­els!

“It’s cer­tainly a strange feel­ing work­ing with the old ri­val,” said David Moun­tain. “Al­though the Sil­ver­stone Clas­sic is a real cel­e­bra­tion of his­toric mo­tor rac­ing so it doesn’t have quite the same pres­sure we were un­der in 1990. I re­mem­ber back then go­ing up and down the by­pass on trade plates try­ing to set the boost up prop­erly. Not sure that would hap­pen to­day…”

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