RACING

IT’S ALIVE

Two years in the making, the billet-aluminum block and head 6.7L Cummins manufactured by D&J Precision Machine is up and running. Coined the Executioner, it comes with a bed plate and 6-bolt mains, D&J’S own rods and pistons, and a groundbreaking aluminum 24-valve cylinder head with 12 exhaust ports. That’s right, there is an individual port per exhaust valve, which we’re told yields gains of more than 100 cfm. Built for the guys at Firepunk Diesel, this version has been treated to 500-percent over Exergy injectors, Exergy tuning via a Bosch stand-alone ECM, and is fed air by way of a GT55 turbo and nitrous.

Early testing of the all-new engine looked promising, with all passes being made in the 1,500hp range and at 5,000 rpm. During testing, everything from different injectors to varying timing tables was tried, logged, and analyzed. All testing was performed with the single, 91mm Garrett GT55 and without any nitrous in the mix. An unfortunate broken valve bridge brought testing to an early halt, but stronger units are already in the works.