Master head porter Larry Meaux at Meaux Racing Heads in Abbeville, Loiusiana just finished dynoing Jeff Wales' 730ci BBC engine for "Thor", his AMRA (American Mud Racing Association} Mud Truck. This C&S Performance Engines (Chris & Stephanie) bad boy made made 2,101 HP on a very easy nitrous squeeze, 1,611 HP w/2-4's N.A. and 1,572 HP w/1-4 barrel N.A.
It was run with Larrys' new custom-built SF-871 Absorber setup on his SuperFlow SF-901 engine dyno which gives him about 3000 HP capacity and 2000+ Lbs TQ, thanks in part to a new Interface 5000 LbsTq Strain Gauge. C&S kept the compression ratio relatively low with C23 race gas and did not use Q16 oxygenated fuel because this year its not legal for Mud Truck. The 1572 HP single 4V Dominator version was the perfect setup as you can only run a single 4-barrel carb in that class.
The engine features a Sonny's Racing Engines (SRE) aluminum block with a 5.080-inch bore and a 4.500-ich stroke with a rod length of 8.50-inch. It has a 13.75:1 compression ration and runs through 8000 rpm. The SRE aluminum heads hold 2.825/2.100-inch valves with 1.2490inch lift on the intake side and 1,2150-inch on the exhaust. Duration at .050-inch lift is 283 degrees and a whopping 314 degrees on the exhaust side to accommodate the exhaust volume generated by the nitrous. The camshaft has a lobe centerline of 117.5 degrees installed at 117.8 degrees.
Compare the accompanying PipeMax analysis with the actual test runs.
Two four barrels with mild nitrous oxide, 2,101 HP
Two four barrels, naturally aspirated, 1,611 HP
Single four barrel, naturally aspirated, 1,572 HP
Chris Laquerre at C & S Performance did all engine assembly and sciencing out the final combination , mostly using PipeMax. The single four barrel carb is a BLP Dominator flowing 2100 CFM on Larry's flowbench. The twin four barrels are 1300 CFM ProSystems carbs. VED ( David Visner ) did the Sheet Metal Manifold, (http://www.visnerengine.com/).
"We installed the latest MSD programmable ignition setup permanently mounted on the Dyno. We needed that setup to start the high comp ratio engines and to program our own ignition advance curves especially when we test with various amounts of nitrous on the dyno. We retard the ignition timing a specified rate per rpm," Larry offered.
Initial modeling in PipeMax (www.maxracesoftware.com) helped Chris home in on the ideal combination and the results were clearly predictable. It's a beast. And don't_cha just know its gonna be one mud slingin' son of a gun.
Meaux Racing Heads