Modern Auto Tech Study Guide Chapter 11 Pages Engine Fundamentals 62 Points

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1 Modern Auto Tech Study Guide Chapter 11 Pages Engine Fundamentals 62 Points

2 1. The is the area between the top of the piston & the cylinder head. Combustion Chamber Cylinder Chamber Chamber of Commerce

3 2. The crankshaft converts the reciprocating motion of the piston into useful motion. Rotary Linear Shaking

4 3. The top of piston travel is known as. is the bottom point of piston travel in the engine. Abbreviations for these positions are TDC and BDC. Top & Center, Bottom & Center All the Way Up, All the Way Down Top Dead Center, Bottom Dead Center

5 4. The piston is the distance traveled from TDC to BDC and also the word used to describe one piston movement during the four-strokecycle. The crankshaft turns 180 degrees during each stroke. Stroke Bore Displacement

6 5. The stroke is a down stroke of the piston when the intake is open. The Air/Fuel mixture enters the combustion chamber from the intake manifold during this stroke. Intake, Valve Intake, Piston Intake Shaft

7 6. The stroke is an upstroke of the piston with both valves. The A/F mixture is squeezed to about 1/10th of its original volume to heat it before the spark ignites it. Compression, Open Compression, Closed Compression, Centered

8 7. The stroke is the only forceful down stroke during the cycle. It is caused by the burning A/F mixture expanding and pushing the piston down. Both valves are closed during this stroke. Power Combustion Peculiar

9 8. During the stroke the spent A/F mixture is pushed out past the open exhaust valve as the piston moves on this upstroke in the cylinder. During the four-stroke-cycle, the crankshaft rotated 2x. Exit Extinguish Exhaust

10 9. The main casting of the engine is the cylinder. The or cylinders are machined in to the block. The pistons reciprocate through the cylinders during operation. Block, Heads Block, Bores Block, Pistons

11 10. The block contains passages for known as galleries. Water are the coolant passages surrounding the cylinders. An antifreeze solution circulates through these coolant passages. Oil, Jackets Oil, Sweaters Oil, Sport Coats

12 11. Crankshafts have highly polished, precisely machined bearing surfaces known as. Kernels Journals Flat Spots

13 12. Engine are low-friction, precision inserts that support the crankshaft. Rod Bearings Main Bearings Cam Bearings

14 13. Crankshaft prevent engine vibration & provide spinning momentum. Counterweights Paperweights Balance Shafts

15 14. The crankshaft sticks through the front of the block while the crankshaft at the back of the block holds the flywheel (manual transmission) or the flex plate (automatic transmission). Snout, Flange Nose, Tail Front, Rear

17 15. The crankshaft main bearing is fit with side rails to control crankshaft end play. Trust Thrust Support

18 16. The front & rear main prevent oil leakage at the ends of the crankshaft. Oil Pump Oil Seal Oil Slinger

19 17. The (manual trans) or the flex plate (automatic trans) contains the starter ring gear. Flywheel Drive Wheel Flyweight

20 18. The fastens the piston to the crankshaft. Idler Arm Push Rod Connecting Rod

21 19. As the pistons reciprocate in their bores, the top two compression seal the pistons to the cylinder wall to prevent blow-by. The space between the rings on the piston is known as the ring lands. Rings Thing 1 & Thing 2 Blings

22 20. The bottom piston ring is the 3-piece, control ring which prevents crankcase oil from entering the combustion chamber. Oil burning would cause blue-gray smoke in the exhaust. Thrust Blowby Oil

23 21. The contains the intake and exhaust, and the ports which are passages for flow of the air/fuel mix & exhaust leading into and out of the combustion chamber. Cylinder Head, Valves Cylinder Head, Manifolds Cylinder Head, Shafts

24 22. The of the poppet valves slide though polished valve as they open & close. Stems, Seats Stems, Guides Stems, Lobes

25 23. Smooth valve faces seal against round, precisely machined valve in the cylinder head. Seats Seals Seams

26 24. The is the shaft responsible for operating the valves. They can be located in the engine block on push rod engines or over the top of the cylinder head on overhead camshaft engines. Crankshaft Camshaft Balance Shaft

between the lobes and the stems to reduce wear.

27 25. Camshaft lobes do not directly touch the valve stems, instead a valve, valve tappet, or cam follower is located between the lobes and the stems to reduce wear. (roller lifters reduce friction!) Over Head Valve Guide Seat Lifter

28 25. Camshaft lobes do not directly touch the valve stems, instead a valve, valve tappet, or cam follower is located between the lobes and the stems to reduce wear. (roller lifters reduce friction!) Single Over Head Camshaft Guide Seat Lifter

29 25. Camshaft lobes do not directly touch the valve stems, instead a valve, valve tappet, or cam follower is located between the lobes and the stems to reduce wear. (roller lifters reduce friction!) Double Over Head Camshaft Guide Seat Lifter

30 26. Valve prevent oil from leaking between the stems & guides into the combustion chamber. Seats Seals Seams

31 27. Valve assemblies pull the valves tightly shut as cam lobes rotates away to allow closing. Seat Spring Keeper

32 28. The manifold distributes the A/F mix to the individual cylinders and the manifold collects exhaust from the cylinders and delivers it out through the CAT & the exhaust system. Intake, Exhaust Inlet, Exit Intake, Out Take

33 29. The cover, a.k.a. the arm cover, fits over the top of the cylinder head. Valve, Rocker Cam, Rocker Crank, Rocker

34 30. Camshafts can be driven by timing, timing, or timing. Engines can have 1, 2, or 4 and engines can have 2, 3, 4, 5, or 6 per cylinder. Gears, Belts, Chains Camshafts Valves

35 31. Camshafts turn at - the crankshaft speed, revolving only one time per 4 stroke cycle. Two - Times One - Fourth One - Half ½

36 32. The vibration or harmonic balancer is a rubber mounted, heavy wheel on the crankshaft snout used to reduce engine vibration. Ignition timing marks are often found on the balancer. Damper Tamper Camper

37 33. Check off the ways in which a serpentine belt (a.k.a. accessory drive belt) differs from a camshaft timing belt:

38 External Accessory Drive: [ ] Timing Belt [ ] Serpentine Belt Timed/Cogged: [ ] Timing Belt [ ] Serpentine Belt Multi-Ribbed: [ ] Timing Belt [ ] Serpentine Belt Higher $ Cost: [ ] Timing Belt [ ] Serpentine Belt It s OK if it Slips a Little Bit: [ ] Timing Belt [ ] Serpentine Belt Must Not Slip: [ ] Timing Belt [ ] Serpentine Belt

Chapter 14 Small Gas Engines

Chapter 14 Small Gas Engines Use the Textbook Pages 321 349 to help answer the questions Why You Learn So Well in Tech & Engineering Classes 1. Internal combustion make heat by burning a fuel & air mixture