Cummins Funny Car Engine - Torque
1,500 LB-FT And 5,200 RPM
It's not often that you see a diesel truck engine that is capable of more than 1,500 lb-ft of torque, and it's even less often that you see one turning 5,000 rpm. John Robinson's awesome P-pumped common-rail 5.9L Cummins can do both.
This is the engine that powers John Robinson's diesel-powered Funny Car, which has run the quarter-mile in the high 8s, at almost 150 mph. For his drag racing vehicle, John needed both high torque and high rpm, and he found this balance by adapting a Bosch P7100 pump to a newer common-rail engine. The Industrial Injection 13mm P-pump allows John to rev to 5,200 rpm on a burnout, while the superior cylinder head flow of the 24-valve common-rail allows his engine to still make good power at that rpm. John also noted that the common-rail block is beefier, and has improved oiling over the 12-valve design.
Unfortunately, the addition of a mechanical pump was not a bolt-on deal. John had to rework the block by drilling new holes for the 12-valve front cover, as well as sourcing a new oil pan. The injectors, injector lines, and drive gear are all different as well. Once the mechanical pump swap became a reality, attention was given to producing some reliable power. The block was fitted with a stock, balanced crankshaft, 12-valve connecting rods, and 15.5:1 compression Mahle steel pistons. The block was O-ringed, and the head was ported by John's shop, Texas Diesel Power. To take advantage of the ported head, a Helix 2 cam and Harland Sharp roller rockers are used, along with a ZZ Fabrications intake manifold and a custom intake horn built by Pinnacle Power. A custom intercooler by Joe Hellman, and an 80mm Industrial Injection turbocharger provide plenty of boost to the hybrid common-rail. A three-stage dry-sump oiling system keeps the engine alive and sunk low inside the Funny Car's body, and if John feels he doesn't have enough power, there's always the NX progressive nitrous system.
John's pretty happy with his results so far, and in the future he plans on running in IHRA classes as well as selected diesel events. His combination is unique, extremely loud, and he can shoot 3- to 4-foot flames out the stack, thanks to 2,000-degree EGTs. John and his wild Texas Diesel Power Funny Car will be making the rounds for 2009, so look for him at a track near you! DP