It’s amazing what a little bit of boost does for a 40-year-old motor when you seal it up nice and tight. Larry’s didn’t baseline this engine normally aspirated, but we can assume that this engine could easily make at a minimum of 1 hp per cubic inch, which would put the power at around 400 to 420 hp. With that as a base, looking at the pump-gas test, the blower package was worth a solid 330 hp, which is just shy of a 80 percent power increase. That’s fantastic power considering the limitations of pump gas. The water injection certainly helps, especially with the near-12 psi of boost. The accepted rule is that beyond 8 psi of boost, most engines really need an intercooler. The supercharger is a ProCharger D1-SC and is the major ingredient in the Supercharger Store kit, which also includes mounting brackets, a carburetor, a MagnaFuel fuel pump, a water injection system, and a Competition Carburetion blow-through carburetor.The supercharger is a ProCharger D1-SC and is the major ingredient in the Supercharger Sto After bolting on the Edelbrock Torker intake and the rest of the engine’s top-end components, Peto assembled the Supercharger Store brackets that employ a small-block Chevy main plate with adapters for the AMC engine. The small hose entering the blower inlet is the water-injection discharge. That’s shop owner Larry Peto on the left, Supercharger Store co-owner Bob Woods in the center, and Larry’s employee Wes Stocum on the right.After bolting on the Edelbrock Torker intake and the rest of the engine’s top-end componen The Supercharger Store worked with Competition Carburetion to develop these interesting right-angle bowl vents. The idea is much like an aircraft pitot tube that measures air speed. Directing the vent tubes into the oncoming airflow equalizes floatbowl pressure with the top of the carburetor. Woods says adding the bowl vents on the gasoline-version carburetor allowed them to lean the jets six sizes.The Supercharger Store worked with Competition Carburetion to develop these interesting ri One other way to gain both reduced outlet temperatures and added octane is with that magic alcohol E85 fuel. To ensure the correct 85 percent blend of alcohol with a safe octane rating, we poured in a few gallons of Rockett Racing brand race E85 rated at 112 octane. With no changes to ignition timing or blower pulleys, the discharge temperature dropped at the lower boost levels from 117 degrees F to 92 degrees, but at peak rpm, the differential had shrunk to roughly 10 degrees. Nevertheless, peak power increased by 40 hp. As a final test, we used a Total Seal leakdown tester on three cylinders, and all three read between 2 and 3 percent leakdown. So, clearly, those Total Seal rings are doing their job. EndAs a final test, we used a Total Seal leakdown tester on three cylinders, and all three re According to Peto, this is not unusual, as he’s seen greater increases—and this is E85 against an engine with water injection. The pump-gasoline discharge temperatures would have been much higher without the water injection. We were shocked by the 791 hp peak number at a mere 6,000 rpm. That’s damn strong for any street engine—especially considering the simplicity of adding the supercharger to the engine. Big power with a simple bolt-on is the ultimate in instant-power gratification. Dyno Numbers RPM TQ1 HP1 TQ2 HP2 Boost (psi) 3,600 540 370 571 391 5.1 3,800 558 404 598 432 5.3 4,000 585 445 630 480 5.9 4,200 609 487 663 530 6.6 4,400 635 532 685 574 7.3 4,600 662 580 692 606 7.6 4,800 662 605 696 636 8.6 5,000 674 642 715 681 9.4 5,200 675 669 714 707 10.1 5,400 684 703 715 735 10.8 5,600 686 731 719 766 11.7 5,800 670 740 701 774 12.1 6,000 653 746 692 791 13.3 Peak 661 723 715 791 13.3 psi Average* 637.9 588.7 676.2 623.3 8.7 psi *Test 1 was the engine with max boost of 13.9 psi and pump gas with a 50/50 mix of water and methanol. *Test 2 was with E85 and no other changes. Max boost was 13.3 psi. Parts List Description PN Source Price Diamond 4.195 piston Custom Diamond Pistons Call Total Seal rings MS7560 65 Summit Racing $376.99 Total Seal cylinder wall and assm. lube QP1 Total Seal 25.00 Comp camshaft Custom Comp Cams Call Comp hydraulic lifters 867-16 Summit Racing 94.95 Comp valvesprings 926-16 Summit Racing 86.95 Comp retainers 740-16 Summit Racing 52.95 Comp valve locks 614-16 Summit Racing 22.95 Comp guide plates 4835-8 Summit Racing 71.99 Comp aluminum rocker arms 1044-16 Summit Racing 314.95 Comp rocker studs 4512-16 Summit Racing 55.95 Comp roller timing set 3118 Summit Racing 64.95 Comp Break-in, 10w30 (12 quarts) 1590-12 Summit Racing 59.95 Edelbrock Torker intake 2930 Summit Racing 249.95 Larry’s Stage II porting Call Larry’s Engine Call MSD Distributor 8519 Summit Racing 266.95 MSD 6AL 6421 Summit Racing 251.95 MSD plug wires 31189 Summit Racing 82.95 Canton oil pan 15-554 Summit Racing 349.95 Canton pickup 15-555 Summit Racing 52.95 Supercharger kit D1-SCAMC Supercharger Store 6,990.00 Edelbrock valve covers 4431 Summit Racing 46.95 Rockett Racing E85 fuel E-85-112 Dealer network 6.00/ gal. Sources Accessible Technologies, Inc. (ProCharger); Lenexa, KS; 913/338-2886; ProCharger.com Comp Cams; Memphis, TN; 800/999-0853; CompCams.com Competition Carburetion, LLC; Sun Valley, NV; 775/331-5609; CompetitionCarburetion.com Diamond Racing; Clinton Township, MI; 596/792-6620; DiamondRacing.net Edelbrock; Torrance, CA; 310/781-2222; Edelbrock.com Larry’s Engine & Marine; Tucson, AZ; 520/623-5373; LarrysEngine.com MSD Performance; El Paso, TX; 915/855-7123; MSDIgnition.com Rockett Brand Racing Fuel; Yorba Linda, CA; 714/694-1286; RockettBrand.com The Supercharger Store; Huachuca City, AZ; 520/456-9706; TheSuperchargerStore.com Total Seal Piston Rings; Phoenix, AZ; 623/587-7400; TotalSeal.com « | 1 | 2 | View Full Article By Jeff Smith Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!
