Eric Buddrius

Amanda Bolland

Ian Lootens

Greg Hilbert

STEALTH CAT’S

UPDATED PROBLEM STATEMENTWant 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

UPDATED SPECIFICATIONS

SOUND Quieter than stock

CAT Easily removable and replaceable

SIZE Fits in chassis

BACK PRESURE Similar to stock

• 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

EXPERIMENTATION 1 12/2/2010• Each configuration was tested 6 times: 3 times per side

• dBA is the average of all the runs

Configuration dBAStock with Panels 83.93Stock without Panels 85.522 Hushpower in Parallel 88.972 Hushpower in Series 86.473 Hushpower in Series 86.991 Hushpower 89.13Laminar Flow 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

• Determined that inside versus outside the sled did not affect sound

Configuration dBAStock external 85.65Stock internal 85.672 Hushpower in Series 85.6

POSSIBLE OPTIONS W/TWO HUSHPOWERSLinear Triangular

SYSTEM DIAGRAM

Hushpower Mufflers

Intake

Exhaust

Welded Top Cap

Welded Bottom Cap

Shell

CAT

Removable End Cap

BILL OF MATERIALSPART NAME QTY. OVERALL SIZE COSTShell Wrap 1 17.8" x 48" x 1/16" 15.35

1/16" SHEET METAL 2" x 48" x 1/16" (2" x 15" EXTRA) 1.71Top band 1 2" x 20" x 1/16"Top Baffle 1 2" x 3.875" x 1/16"Bottom 1 2" x 8.5" x 1/16"

1/16" SHEET METAL 4" x 24" x 1/16" 1.71Top 2 1 4" x 7.375" x 1/16"Bottom Band 1 4" x 8.25" x 1/16"Bottom spacer 1 4" x 8.25" x 1/16"

1/16" SHEET METAL 7.5" x 48" x 1/16" (7.5" x 8" EXTRA) 6.39Shell Top 1 7.5"x 13.5" x 1/16"Shell Bottom 1 5" x 9.25" x 1/16"Top spacer 1 6.5" x 10.5" x 1/16"Top 1 1 5.125" x 6.75" x 1/16"

1/4" SHEET METAL 5" x 16" x 1/4" 5.68Cat upper ring 1 4"OD x .5" (3.25"ID) Cat Bottom ring 1 5"OD x .25" (4"ID)Cat cap 1 5"OD x .5" (3"ID)

MISCILANIOUS HARDWARE 19.17TOTAL 50.00

DRAWING PACKAGE• Three parts to machine

• Several to cut

• Everything will be welded but the end cap which will be bolted

Settling Chamber

SCHEDULE January 26th Finish Flow Testing

• Large and Small diameter CAT’s• Stock Muffler• Hushpower Mufflers in Series

January 26th Building Materials Obtained

• Acquire materials from Hushpower

• Buy steel from Facilities • Cut parts

January 27th Begin Muffler FabricationFebruary 3rd End of Fabrication

February 4th Begin Dyno Testing Muffler

• Develop MAPFebruary 9th Begin Sled TestingMarch 4th Leave for CompetitionMarch 7th to 11th Competition

QUESTIONS?