#Cnc flycut wheel series#
The cam in a Cummins B Series doesn’t use cam bearings in all of the cam bores, but a high-performance cam like the Hamilton requires them due to the increased lift and spring pressures. All this adds up to significant improvements in breathing ability, but it does narrow the powerband significantly, moving it up to the 4,000-5,200 rpm range. Intake and exhaust duration are 232° and 252° respectively, compared to 159° and 206° stock. The Hamilton increases overlap to 105.5°.
The stock cam has 107.5-inch lobe separation angles (LSA, also LCA for Lobe Center Angles). The stock cam has 0.235-inch intake and 0.297-inch exhaust lobe lift. The difference in lift and duration are obvious even to the eye. Hamilton’s 232-252-105.5 cam is designed for high-revving Cummins engines.
With these mods, the engine cranked out 650 hp and nearly 1,200 lb-ft on 60 lbs of boost with 55 psi of drive pressure. valve springs from Hamilton Cams allowed the engine to rev to 4,300 rpm. The next step was to give the engine the air it needed using a non-wastegated DDP T-4 turbo with 82mm turbine and 74mm compressor wheels (“Cummins 24V Turbo Upgrade”, Diesel World, September 2012, p. The club wasn’t sure of what had been done to the donated Bosch P-pump, except that it had been “tweaked.” Dynomite Diesel Performance (DDP) sac-type injectors were added and the engine jumped to 392 hp and 854 lb-ft, but with 65 psi of drive pressure and only 35 psi of boost, it was clear that it desperately needed more air (“Injection Connection,” Diesel World, March 2012, p. Next up, Preble County Diesel in Eaton, Ohio, O-ringed the head using BHJ tooling an ARP supplied a set of its then-new ARP20 head studs to hold the head down (see “Rings of Fire” in the November 2011 issue of Diesel World, p. Even in a low-time engine, having fresh, top-quality bearings, pistons, rings, gaskets and seals and seals makes for worry-free tinkering down the road. Step one was an overhaul using internal engine parts from Federal Mogul and Fel-Pro. DW was able to facilitate the donation of a number of good products to help them along. The club is supported by the University, but is required to generate a significant portion of its project revenue from fund-raising activities. This is the point where Diesel World got involved. In that configuration, and with a locked-down wastegate and 34 psi of boost, the engine made 340 hp at 2,500 rpm and 730 lb-ft at 2,400 rpm on one of the school’s DTS engine dynos-and that was excessive exhaust restriction upstream of the turbo and huge clouds of smoke, a sure sign of wasted fuel and an engine struggling to breathe. Nobody remembers how the engine was originally configured, but it first made smoke for the Diesel Club with a lightly modified P-pump, no-name “100-hp” injectors (they weren’t), and a totally inadequate Holset HX-35W turbo scavenged from a parts pile. In the truck, ice water is used but even with 65 degree tap water, more than 100 degrees was knocked off the intake air temps. You can see the air-to-water intercooler, which is hooked up to a tap water hose. In this photo, the engine is running the donated used turbo before it grenaded. You can almost hear wrestling announcer Michael Buffer’s dramatic, “Let’s get ready rumble!” That’s not Caterpillar yellow, it’s Cummins Old Gold, the color Cummins engines were painted back in the 1950s and ’60s. It’s one of the dreaded Brazilian 53 blocks, which have thin water jacket walls and are more prone to cracking, but so far this engine hasn’t presented any problems. The heart of the truck is a 24-valve engine dating from about 2001, an industrial engine donated by Cummins to the school. With the purchase of an additional truck and the donation of another, the Diesel Club soon had enough parts for a working vehicle. Work on the project started back in 2006 with a worn-out shop truck and a collection of parts from unused training-aid piles. We’ve been following the University of Northwestern Ohio Diesel Club’s Cummins-powered pulling truck since 2011, and we’ve been pleased to see the students transform a shop truck into a serious sled puller.
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