Small Block Chevy Centrifugal Supercharger Test - Danger Mouse Part 18 Huffin' And Puffin'

It's Boost Or Bust On DM's Second Run Of The Season

Mike Petralia Mar 1, 2004 0 Comment(s)

CLICK BELOW TO SEE ALL OF THE STORIES COVERING THE BUILD OF PROJECT DANGER MOUSE

DANGER MOUSE PART 1

DANGER MOUSE PART 3

DANGER MOUSE PART 4

DANGER MOUSE PART 5

DANGER MOUSE PART 7

DANGER MOUSE PART 8

DANGER MOUSE PART 9

DANGER MOUSE PART 10

DANGER MOUSE PART 13

DANGER MOUSE PART 14

DANGER MOUSE PART 15

DANGER MOUSE PART 18

DANGER MOUSE PART 20

DANGER MOUSE PART 22

DANGER MOUSE PART 23

DANGER MOUSE PART 24

DANGER MOUSE PART 25

Sucp_0403_01_z Supercharged_chevy_small_block Engine 1/20

Although we've had a lot of fun testing all the different combinations to see how much power Danger Mouse (DM) could make without any power adders, we figured it was about time DM got serious. Because, let's face it. It's become way-to-easy to build a 400hp small-block today and we've already grown tired of such mundane challenges. We always wanted DM to lead the charge, not follow it. So now it's time to see just how much power DM could really make. Or maybe if this would be the test that breaks the Mouse's back.

For this installment we searched out a means to produce so much power that some called us mad. Except, we also had to make sure that the power we made was something you could easily do at home and without having to sell your car just to finance the engine! It also had to be bare-bones simple, the kind of parts it takes less than a weekend to install and we think we torpedoed the target. This month's tests involved bolting on a centrifugal D-1SC ATI Procharger and boosting DM with just enough extra air to crank out almost 700 hp on pump gas! We probably could've made more power, but we ran out of time during our day at the dyno.

Sucp_0403_04_z Supercharged_chevy_small_block Dyno_chart 2/20

We've been considering attempting to make this kind of power with ATI's entry-level P-1SC blower ever since we did the series on ATI's 8-second, pump-gas Super Street Nova, (see: SUPER CHEVY December 2002, January, February, March 2003) and we knew we wanted to run one of their self-contained units, which the D-1SC is, so the choice was simple. We also didn't want to blow out the street-style Fel-Pro (PN 1003) head gaskets so the plan was to limit to the boost to about 15 psi. Besides, pumping in more than one atmosphere (14.7 psi is equal to one atmosphere) on pump gas is very tough for any motor to handle. But none of that really mattered because DM is tough and after it made 697 hp at 6,200 rpm and 613 ft-lb of torque at 5,500 rpm, our resident test mule was now running with some of our a bad-boy big-blocks and we're lovin' every minute of it!

To build this much power from only 355 cid takes thorough planning and some stout parts. You may recall that in the beginning we built DM using the strongest parts around, just in case we ran such a test. So this time the World Products four-bolt Motown block and forged Lunati crank, rods, and pistons were really put to the test. We're happy to report that they all performed flawlessly and might make 800 hp the next time out!

Sucp_0403_05_z Supercharged_chevy_small_block Turbo 3/20

Since this test was going to use a bolt-on centrifugal supercharger, we wanted to run Electronic Fuel Injection (EFI), even though carb kits are available for these blowers. We contacted ACCEL for one of its GEN VII Digital Fuel Injection (DFI) systems, just like EFI, but with a different acronym, and the first time we opened the big box it came in, we knew we'd made the right choice. The ACCEL manifold and its related components came completely assembled, with all fittings and injectors installed and even the billet throttle body mounted in place. This was truly going to be and easy bolt-on.

Next, to insure that the DFI and blower would work well together and make the most power they could, the crew at Speed-O-Motive installed an off-the-shelf hydraulic roller cam from Crane. In keeping with the spirit of making the most power it ever has, DM's new cam is also the largest it has run to date, with 240/248 degrees duration at 0.050 inches and more than 0.590-inch lift with the 1.6:1 COMP Cams Pro Magnum roller rockers we ran. This cam sure wasn't a little street grind, but combined with the blower, the engine idled well at 900 rpm making greater than 9-inches of vacuum. And to make sure that DM was compatible with the new blower, (read that as having lower compression) we once again installed the set of big-chamber Trick Flow Specialties (TFS) aluminum heads that we've used on several previous tests (see: SUPER CHEVY July, August, September 2003).

The TFS heads, combined with the flat-top Lunati pistons, put DM's compression at 9.1:1, which may still seem a bit high for a blown motor running pump gas. But, the DFI and big cam, along with the centrifugal blower's high efficiency, meant that we were confident DM would not detonate itself to death. And the fuel experts at 76 Racing who supplied the gas for this test agreed that their 91-octane unleaded could support the boost levels and power we were trying to make. So from there it was onto the dyno.

Sucp_0403_26_z Supercharged_chevy_small_block Chech_up 19/20

Maybe it was to check up on us or to see his favorite pet project in action, whatever the reason, it was great to have our boss, Terry Cole (right), stop by to help with the tests.

The results shown here are listed chronologically and represent the power made before and after the Procharger was installed. Test 31 was without the blower and just running the ACCEL DFI. To baseline the motor's power. If you're not interested in a blower, but still want a great fuel injected street engine, this package ii one to look at. It made good torque, even though the cam was very big and the peak hp numbers are very respectable. Test 32 was actually one of the last tests we ran that day. It was after we'd tried many different pulley combinations and found the best one to be the pulley that ATI recommended we run. It made over 14 psi.

Danger Mouse short-block specs for Part 18, Tests 31-32: 355 cid, 9.1:1 cr, 4.030-bore four-bolt Motown block, 3.48-stroke Lunati crank, 5.7-inch Lunati steel rods

Test 31: DM Part 18 - ACCEL Gen VII DFI with 55 lb-hr injectors and Dual Sync ACCEL computerized distributor. Crane Cams hydraulic roller camshaft PN 119681 (306 intake/314 exhaust advertised duration; 240/248 at .050 inches; .595/.595 lift with 1.6:1 ratio rockers; 114 lobe separation, installed at 109 intake centerline). Crane retro-fit hydraulic roller lifters, Crane pushrods (special 7.150-inch length), and COMP Cams 1.6:1 rockers.

Test 32: DM Part 18 - Installed Procharger D-1SC centrifugal supercharger with 4.25-inch pulley.

Sources

Crane Cams
Daytona Beach, FL 32117
866-388-5120
http://www.cranecams.com
Speed-O-Motive
West Covina, CA 91790
626-869-0270
www.speedomotive.com
Vrbancic Brothers Racing
909-930-9980
www.customcarbs.com
Lunati LLC
Olive Branch, MS
662-892-1500
LunatiPower.com
Speed-Pro
Muskegon, MI 49443,
Billet Fabrication
Simi Valley, CA 93065
Accessible Technologies, Inc. (ATI Procharger)
Lenexa, KS 66215,
76 RACING FUELS & LUBRICANTS
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