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

Eric Buddrius

Amanda Bolland

Ian Lootens

Greg Hilbert

STEALTH CAT’S

SPECIFICATIONS

GENERAL REQUIREMENTS

SPECIFIC REQUIREMENTS

ACCEPTABLE PERFORMANCE

QUIETReduces the sound emissions of the sled

78 dBA or less in J-192 Sound test (goal of 73 dBA)

SIMPLE MAINTENANCECatalyst must be replaceable, no other maintenance needed

Cat. replacement takes less than 15 Minutes

PERFORMANCEDoesn't increase backpressure

Less than 110% of stock backpressure

COMPACT DESIGNFits in sled without modification

9" Deep, 18" Tall, 13" Wide

LIGHT WEIGHT Doesn't increase weightLess than 16.76lb (110% of stock muffler weight)

CATALYST• Aristo Contact is Bob McDowell

• Goal: to meet National Park Standards

• Focus: Carbon Monoxide and Unburned Hydrocarbons emissions

Emissions Data

2010 Results

CSC Limit NPS BAT

CO 209.94 < 275 < 120HC 41.6 - < 15NOX 5.8 - -HC+NOX 47.36 < 90 -E-Score 125.9 > 100 -Units: g/kW-hr

MUFFLER BASICS• Two Main Functions

• Reflection

• Most Effective

• Destructive Interference

• High Back Pressure

• Restriction

• Most Common

• Cheapest

• Absorption

• Simple with Low Back Pressure

• Low Damping

HUSHPOWER TECHNOLOGY

A. Entry Cone

B. Laminar Flow Area

C. Thermal Barrier

D. Exit Cone

DESIGN EVALUATION• Flow Bench

• Ricardo Wave

• J 192 Testing Procedure

• Timeline

FLOW BENCH

Test Stand

Settling Chamber

Mass Flow Meter

Vacuum Supply

FLOW BENCH• Active Flow Bench

• Vacuum source

• Test Part

• Multiple uses

• Cylinders

• Porting

• Mufflers

• Air filters

• Measures

• Pressure differential with respect to mass flow

WHAT IS RICARDO WAVE?

MUFFLERS IN RICARDO WAVE

RICARDO WNOISE

RICARDO WNOISE OUTPUT

J 192 SOUND TEST

SOUND TESTING• Existing Muffler

• Laminar Flow Muffler

• Hushpower Muffler

• Affect of Packing

• Small vs. Large Cone Perforation

• Series

• Parallel

TIMELINE• November 29th – Start J192 Sound Testing of Existing Mufflers

• December 10th – Complete Flow Bench

• December 15th – Flow Test Existing Mufflers

• December 17th – Final Muffler Designed

• January 15th – Receive Final CAT

• January 21st – Final Muffler Built

• January 22nd – Begin Testing Final Muffler on Sled

• March 4th – Leave for Competition

QUESTIONS?