55 What's On The Dyno 8/15/13 8:14 AM Page 55
WHAT’S ON THE DYNO?
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HRE’s ‘Jet Express’ Marine Motor Pumps Out 1,200 HP Hameetman Racing Engines (HRE), Cape Coral, FL, recently built this 1,200 horsepower 638 cid engine for a customer to be fitted in an 18-foot Mirage Jet Boat. So far, it has only run 138 mph in a 1/4-mile on one small shot of nitrous (200 hp), says owner Daryl Hameetman. He says it’s going be interesting when they turn the power up for real. “On the dyno, we spent a lot of time moving cam timing because the motor is under cammed for what it is. We took a lot of lift out of it in an attempt to keep the valve train very mild,” Hameetman explains. “The motor makes 1,200 hp with only .830˝ of actual valve lift.” HRE made multiple steady state runs while tuning the 638 in an attempt to simulate the Jet Boat environment during wide open power runs. Hameetman notes that the engine makes 1,000 hp at 5,650 rpm and 1,200 hp by 7,300 rpm with more than 900+ lbs.ft of torque at its disposal from 4,800 to 6,400 rpm. For more about HRE, visit them on Facebook at www.facebook.com/HREPower. ■
So far HRE’s 638 cid build for the Jet Boat has made it up to 138 mph – on the water!
HRE’s 638 Jet Boat Engine Specs: - 4.630 bore X 4.750 stroke - Dart Big M Block with Billet caps - 14.5:1 compression with Diamond pistons and rings - GRP 6.680 aluminum rods - Callies magnum 4.750 Crank - Coated Clevite main and rod bearings - Titan oil pump and Billet Fabrication oil pan - Comp Cams solid roller (.850/.820 lift) standard core on a 117 LSA - Crower .903 hippo lifters - CFE 15 degree heads with Ferrea 2.400/1.900 titanium valves, Comp triple springs and Jesel 1.75 rockers - CFE sheetmetal manifold with dual 1120 Davinci Dominators and dual foggers Circle 55 for more information
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