Engine Performance & Diagnosis
Engine Performance & Diagnosis AT 261
Community College of Philadelphia
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This 5 page Class Notes was uploaded by Miss Zena McCullough on Sunday October 11, 2015. The Class Notes belongs to AT 261 at Community College of Philadelphia taught by Daniel Reed in Fall. Since its upload, it has received 21 views. For similar materials see /class/221225/at-261-community-college-of-philadelphia in Automotive Technology at Community College of Philadelphia.
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Date Created: 10/11/15
Engine Efficiency Thermal Ef ciency 35 lost to cooling and lubrication 35 lost to exhaust gas 5 loss in engine friction 10 loss in power train friction End result 15 of gasoline power is applied to wheels Volumetric Efficiency Amount of air that fills the cylinder VS how much can it hold Variables include intake exhaust and valve timing and sizes Other types of engine designs Atkinson Cycle Engine Uses the idea that the intake valve is left open longer past BDC compression When used with a variable valve timing system it allows control over engine displacement Highway 20 L WOT or high load 25 L Advantage efficient Disadvantage requires variable valve timing and extra hardware Two Stroke Engines Every TDC stroke is a power stroke Advantage more power per RPMs No Valves Disadvantage VERY dirty engine to run Loud Smoky Poor cold running since engine runs so rich Wastes fuel since some of it blows out the exhaust with each stroke No low RPM torque Diesel Engines Uses more fuel than air All are injected Needs glow plugs to preheat fuel when cold Runs on compression has no ignition system or spark Can run on Kerosene Corn Oil Peanut Oil Uses a fuel pump to act as speed of engine Advantages Very efficient with the fuel it uses Very high torque Disadvantages soot noise Water in fuel Dirt in lel Vibration Thank GM Modern diesels are far better at being clean and low noise generators Some diesels are as fuel MPG wise as a Hybrid and do so wo the electric motor and battery Up to 60 MPG Rotary Engine Felix Wankel Two Cycle design however has no pistons and valves Uses two plugs per rotor Very high power wsmall displacement Very high and never ending HP curve Limited only by speed of external engine parts Advantages 3 total moving parts Disadvantages Seems to get 20 MPG Apex seal failure 60K miles Fairly dirty older ones used 4 converters inline Miller Cycle Similar in design and idea to the Atkinson cycle engine Uses a super charger as well as the modified intake stroke of the Atkinson cycle Stratified Charge Engine Uses both a rich and lean mixture in the same cylinder More of a cylinder head design Your Honda engines were like this Uses a 3rd intake valve to do this Motor oils API SAE What it does 8 C ratings Synthetic oils SW30 vs 10w40 What does that mean Oil Pump Filters Pressure Relief Valve Bearings Oil Level Pressure Gauge Water Cooling Systems Tstats Water Pumps Coolant Types Radiator Heater Core Hoses Pressure Cap 190210 deg F Add Ons Oil Pressure Gauge Oil Temperature Gauge Oil Cooler Lower Temperature Thermostat Deeper core radiator More cooling fans Oil Pressure Tests Why Oil Pressure warning system gauge Engine Knocking or noise Check oil level Quality Last oil change Filter brand Grade of oil Locate oil grades and quantities Locate and test oil pressure sender circuit How they work Switch is grounded to engine block when pressure is low completes ckt and turns on warning light How to test Jump sensor wire to ground with engine running and check status of warning light Check sensor resistance between sensor output and ground Resistance should change when engine is started Remove sensor Install pressure gauge MAKE SURE THREADS ARE THE SAME Start engine Check for leaks Check hose Routing around hot engine parts Warm up engine to operating temp Use Thermo gun or wait until cooling fans cycle once Run engine at 2000 RPM Measure pressure at idle and 2000 rpm Check with specs in Mitchell s On Demand