Stealth CAT’s
description
Transcript of Stealth CAT’s
Eric Buddrius
Amanda Bolland
Ian Lootens
Greg Hilbert
STEALTH CAT’S
SPECIFICATIONS
GENERAL REQUIREMENTS
SPECIFIC REQUIREMENTS
ACCEPTABLE PERFORMANCE
QUIET Reduces 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
PERFORMANCE Doesn't increase backpressure
Less than 110% of stock backpressure
COMPACT DESIGN Fits in sled without modification 9" Deep, 18" Tall, 13" Wide
LIGHT WEIGHT Doesn't increase weight Less 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?