1. Eric Buddrius Amanda Bolland Ian Lootens Greg Hilbert STEALTH CAT’S

2. UPDATED PROBLEM STATEMENT Want the 2011 U of I CSC sled to be CLEANER and QUIETER Cleaner: Goal: meet National Park Standards E-score of 170 Carbon Monoxide less than 120 g/kW-h Unburned Hydrocarbons less than 15 g/kW-h Quieter: Target: pass competition with 78 dB Goal: meet National Park Standards of 73 dB

3. UPDATED SPECIFICATIONS SOUNDQuieter than stock CATEasily removable and replaceable SIZEFits in chassis BACK PRESURESimilar to stock

4. One blank CAT for back pressure testing One CAT with 200 cells per inch CAT Size: 3.5” x 3.5” Body size: 4.5” length x 3.5” dia. Four more CAT’s on the way Put one aside for use in competition with 2-3 hours break- in time During testing we have met NPS CATALYTIC CONVERTER (CAT) FROM ARISTO

5. EXPERIMENTATION 112/2/2010 Each configuration was tested 6 times: 3 times per side dBA is the average of all the runs ConfigurationdBA Stock with Panels83.93 Stock without Panels85.52 2 Hushpower in Parallel88.97 2 Hushpower in Series86.47 3 Hushpower in Series86.99 1 Hushpower89.13 Laminar Flow90.25

6. PROTOTYPES

7. EXPERIMENTATION 21/9/2011 Wondered if stock was quieter simply because it was inside the chassis Ran another set of tests with the stock hanging outside Determined that inside versus outside the sled did not affect sound ConfigurationdBA Stock external85.65 Stock internal85.67 2 Hushpower in Series85.6

8. POSSIBLE OPTIONS W/TWO HUSHPOWERS LinearTriangular

9. SYSTEM DIAGRAM Hushpower Mufflers Intake Exhaust Welded Top Cap Welded Bottom Cap Shell CAT Removable End Cap

10. BILL OF MATERIALS PART NAMEQTY.OVERALL SIZECOST Shell Wrap117.8" x 48" x 1/16"15.35 1/16" SHEET METAL2" x 48" x 1/16" (2" x 15" EXTRA)1.71 Top band12" x 20" x 1/16" Top Baffle12" x 3.875" x 1/16" Bottom12" x 8.5" x 1/16" 1/16" SHEET METAL4" x 24" x 1/16"1.71 Top 214" x 7.375" x 1/16" Bottom Band14" x 8.25" x 1/16" Bottom spacer14" x 8.25" x 1/16" 1/16" SHEET METAL7.5" x 48" x 1/16" (7.5" x 8" EXTRA)6.39 Shell Top17.5"x 13.5" x 1/16" Shell Bottom15" x 9.25" x 1/16" Top spacer16.5" x 10.5" x 1/16" Top 115.125" x 6.75" x 1/16" 1/4" SHEET METAL5" x 16" x 1/4"5.68 Cat upper ring14"OD x.5" (3.25"ID) Cat Bottom ring15"OD x.25" (4"ID) Cat cap15"OD x.5" (3"ID) MISCILANIOUS HARDWARE19.17 TOTAL50.00

11. DRAWING PACKAGE Three parts to machine Several to cut Everything will be welded but the end cap which will be bolted Settling Chamber

12. SCHEDULE January 26 th Finish Flow Testing Large and Small diameter CAT’s Stock Muffler Hushpower Mufflers in Series January 26 th Building Materials Obtained Acquire materials from Hushpower Buy steel from Facilities Cut parts January 27 th Begin Muffler Fabrication February 3 rd End of Fabrication February 4 th Begin Dyno Testing Muffler Develop MAP February 9 th Begin Sled Testing March 4 th Leave for Competition March 7 th to 11 th Competition

13. QUESTIONS?