STEALTH CATS Eric Buddrius Amanda Bolland Ian Lootens

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

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/k. W-h • Unburned Hydrocarbons less than 15 g/k. W-h • Quieter: • Target: pass competition with 78 d. B • Goal: meet National Park Standards of 73 d. B

UPDATED SPECIFICATIONS SOUND Quieter than stock CAT Easily removable and replaceable SIZE Fits in chassis BACK PRESURE Similar to stock

CATALYTIC CONVERTER (CAT) FROM ARISTO • 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 breakin time • During testing we have met NPS

EXPERIMENTATION 1 12/2/2010 • Each configuration was tested 6 times: 3 times per side • d. BA is the average of all the runs Configuration Stock with Panels Stock without Panels 2 Hushpower in Parallel 2 Hushpower in Series 3 Hushpower in Series 1 Hushpower Laminar Flow d. BA 83. 93 85. 52 88. 97 86. 47 86. 99 89. 13 90. 25

PROTOTYPES

EXPERIMENTATION 2 1/9/2011 • Wondered if stock was quieter simply because it was inside the chassis • Ran another set of tests with the stock hanging outside Configuration Stock external Stock internal 2 Hushpower in Series • d. BA 85. 65 85. 67 85. 6 Determined that inside versus outside the sled did not affect sound

POSSIBLE OPTIONS W/TWO HUSHPOWERS Linear Triangular

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

BILL OF MATERIALS PART NAME QTY. OVERALL SIZE COST Shell Wrap 1 17. 8" x 48" x 1/16" 15. 35 1. 71 1 2" x 48" x 1/16" (2" x 15" EXTRA) 2" x 20" x 1/16" 2" x 3. 875" x 1/16" 2" x 8. 5" x 1/16" 1. 71 1 4" x 24" x 1/16" 4" x 7. 375" x 1/16" 4" x 8. 25" x 1/16" SHEET METAL Shell Top Shell Bottom Top spacer Top 1 6. 39 1 1 7. 5" x 48" x 1/16" (7. 5" x 8" EXTRA) 7. 5"x 13. 5" x 1/16" 5" x 9. 25" x 1/16" 6. 5" x 10. 5" x 1/16" 5. 125" x 6. 75" x 1/16" 1/4" SHEET METAL Cat upper ring Cat Bottom ring Cat cap 5" x 16" x 1/4" 4"OD x. 5" (3. 25"ID) 5"OD x. 25" (4"ID) 5"OD x. 5" (3"ID) MISCILANIOUS HARDWARE 5. 68 1 19. 17 TOTAL 50. 00 1/16" SHEET METAL Top band Top Baffle Bottom 1/16" SHEET METAL Top 2 Bottom Band Bottom spacer

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

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

QUESTIONS?