20-1-65 Wigram Trophy Win Bid Changes Motors New Zealand's leading racing driver Bruce McLaren and his teammate American Phil Hill will be all out to make. amends in the Lady Wigram Trophy on Saturday for their indifferent performances in the New Zealand Grand Prix and the Levin international race. Since the arrival of their two Coopers in Christchurch yesterday, their mechanics have fitted a pair of specially prepared short-stroke Coventry- Climax engines which should prove much more powerful than the long-stroke engines they used to finish among minor place-getters at Levin last Saturday. The long-stroke engines were assembled in England and fitted in the cars just before Levin. When they were removed and checked it was found that they had been ftted with low compression pistons in England and were not delivering sufficient power to hold the Lotus-Climax of Scotsman Jim Clark and such other drivers as Australian Frank Gardner, and the New Zealanders Jim Palmer and Kerry Grant, as well as the 15 litre Brabham- Ford driver Roly Levis. More Power • The special short stroke engines deliver considerably more power and Hill and Mclaren, when they used them at the Grand Prix meeting, found they could quite easily hold Clark. The long-stroke engines were used at Levin because they should have been more suited to that tight and slower circuit. With his eye on a Lady Wigram Trophy "hat-trick." McLaren telephoned an engineering orm in Austrana ;terday and ordered additional. (special pistons to use in the • Coopers on Saturday. Bride MEL Mechani dries ere busy in Christchurch morning preparing for Sat urday's Lady Wigram Trophy Race. TOP: Ray Parson (lett), Jim Clark (centre), and Nick Garbett at work on Inhappy It is expected these pistons will reach Christchurch and Tyler Alexander. in-night and will probably be fitted to-morrow in time for the race training sessions on Fri- NcLaren, driving Cooper- Climaxes on each occasion. mon the trophy race in 1963 and again in 1964. But, so far, this international series has been an unhappy one. In the Grand Prix he was forced out with gearbox trouble in the thirteenth lap and at Levin he could do no better than finish in fifth place behind team-mate Hill.