TURBOCHARGERS

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TURBOCHARGERS SUPERCHARGERS

• CHAPTER 7

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FORCED INDUCTION

• 4 WAYS TO INCREASE COMPRESSION
• SUPERCHARGING
• TURBOCHARGING
• CHEMICAL
• ENGINE MODIFICATION

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TURBOCHARGERS

• COMPRESSES AIR GOING INTO COMBUSTION CHAMBER
• DEPENDS ON RAPID EXPANSION OF EXHAUST GASES
  LEAVING COMBUSTION CHAMBER
• TURBO LAG IS A CHARACTERISTIC

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TURBOCHARGER PARTS

• TURBINE
• SHAFT
• COMPRESSOR
• WASTEGATE
• ACTUATOR
• CENTER HOUSING
• CONTAINS COOLING SECTION

222C
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VANE WHEELS
TURN AT 100,000 RPM
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TURBO CYCLE
223C

• EXHAUST GAS FORCES TURBINE TO ROTATE
• COMPRESSOR FORCES (PACKS) CREATING A DENSE
  AIR-FUEL MIXTURE
• CREATES A POSITVE PRESSURE (BOOST)

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BOOST PRESSURE CONTROL

• WASTEGATE DIAPHRAGM
• CONTROLS BOOST PRESSURE
• MECHANICAL OR ELECTRONICALLY CONTROLS WASTEGATE
  OPERATION

224C
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TURBOCHARGER COOLING

• EXHAUST FLOW PAST TURBINE WHEEL CAUSES HIGH TEMPS
• WATER COOLING
• OIL COOLING
• OIL SEALS
• MUST LET TURBO COOL DOWN ON SHUTOFF

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HEAVY DUTY APPLICATION

• SAME PRINCIPLE AS SMALLER ONES
• BOOST PRESSURE SLIGHTLY HIGHER
• COOLING A LOT MORE IMPORTANT
• DIESEL TRUCK, LOCOMOTIVE, HEAVY EQUIPMENT

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POWER OUTPUT COMPARISON
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ROTARY RACING ENGINE
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MAINTENANCE / PROBLEMS

• LACK OF OIL
• DIRTY OIL
• MECHANICAL DAMAGE OF VANE WHEELS
• WASTEGATE CONTROL PROBLEMS
• OIL CAKING

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DIAGNOSIS
PAGE 302 LAB

• OIL LEAKS, HOSES, LINKAGES
• BLUE SMOKE
• EXCESSIVE NOISE
• EXHAUST LEAKS
• TEST BOOST PRESSURE
• TURBO R R REQUIRES PRE-LUBING

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SUPERCHARGERS
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SUPERCHARGER OPERATION

• BELT OR GEAR DRIVEN
• ROTORS ACT LIKE A PUMP AND COMPRESS AIR (PAGE 310
  LAB)
• SUPERCHARGER SPEED IS LIMITED BY ENGINE SPEED
  -TURNS A LOT SLOWER
• SOMETIMES USED WITH INTERCOOLER TO COOL AIR
• BYPASS BUTTERFLY VALVE 230 LAB

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BLOWN ENGINE

• MORE RELIABLE THAN A TURBO
• MUST RECEIVE PROPER LUBRICATION
• IMPROVED THROTTLE RESPONSE OVER A TURBO

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