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Cummins flycut pistons4/1/2023 ![]() ![]() 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. My personal opinion would be to look at something other than the Eldebrock heads.Subscribe Our Weekly Newsletter 1. If you absolutely wanted to have an aftermarket casting, you can look into CID, Mast, TSP, and the ones you listed in the OP. ![]() Yes flycutting or notching is what you do to the factory piston if you get decent size camshaft to run in there an need to get more Pistons to Valve clearance.įor what you want as far as heads go, you would honestly be good with a set of factory ported heads from GPI, Mast, or Pray. I know that I would and have daily driven cars that 90% of the people in this forum wouldn’t, with no issue. Could also look into getting a hold of Martin Smallwood for your cam as well like I did. If not others have ran the SS2 and SS3 in their daily cars. 040 gasket and not have to worry about flycutting if you wanted to run e85. Some people daily drive the NFC LT1 camshaft from GPI with no problems at all which allows you to milled. But everyone’s definition of DD is different. I misread your posy to be honest, but you will not have to flycut your pistons for what you want. Thank you for the info.very helpful.what set of heads do you recommend.also I know I can Google it.but I'd rather hear from someone on here.what is flycutting a piston? Will it be my original pistons? ![]()
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