No oval or oblong shaped holes permitted! There must be only one turbo going through one pressure stage. All air must go through the 2.8 turbo inlet restrictor plate. LINK HERE Turbocharger must have a restrictor plate 1/4 inch thick with a hole no larger than 2.8" in diameter to be measured 2" from the compressor wheel blade. See drawing for maximum turbocharger size. Intercoolers and water injection allowed.
#KEYSTONE TRACTOR PULLS SERIES#
Vehicles must have OEM cylinder head and must be for series engine used - No recast No aluminum No overhead cams allowed.Finished bore size and stroke are used to determine cubic inch. Tractor must have steel flywheel and clutch components. Front wheels must track within rear wheels. All fuel systems must have a three way shut off valve. Repower engines must use original equipment size and type injection pump for the tractor being entered, or injection pump must be maximum of one (A) line pump (German Bosch, one plunger per cylinder). All bolts connecting all housings must be in their stock location-OEM length & location from rear end housing to front of engine. Engine, clutch, transmission, and differential housings, must be bolted together as one unit. OEM cylinder head must be for series engine used-no recast, No aluminum, No overhead cams allowed. Tractors must be agricultural tractors having chassis, engine, clutch, transmission housing, differential housing, transmission, hood and grill of one manufacturer.
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