few things about engine
TRANSCRIPT
Few ThingsAbout
Automobile Engines
By:- Prakash Shakti
Cut way Model of Diesel Engine And Transmission Gearbox
phenomena of Heating in vehicles.
Rudolf Diesel
Diesel Engine
For this inline-4 engine, 1-3-4-2 could be a
valid firing order.
In Compression stroke
1.Piston move from BDC to TDC
2.Inlet valve closes
3.Crankshaft rotate from 180 to 360 degree
4.Fresh air fuel mixture compressed in cylinder
In suction stroke
1. Piston move from TDC to BDC
2.Crankshaft rotate from 0 to 180 degree
3. Intake valve open
4. Fresh air fuel mixture enter in cylinder
In exhaust stroke
1. Piston moves from BDC to TDC
2. Exhaust valve open
3. Crankshaft rotate from 540(180) to 720(360)
4. Exhaust gases go out from cylinder
In power stroke
1. At the end of compression stroke spark plug
fire
2. Air fuel mixture ignites in cylinder which
causes an explosion and power produces
3. Power push the piston down from TDC to
BDC
4. Crankshaft rotate from 360(0) to 540(180)
degree.
Nicolaus Otto
intake
compression
power
exhaust
Petrol Engine
Which is the major axis and minor axis on an automobile piston ? Why ?
In a wet sump, the oil that you put into the engine is stored beneath the crankshaft in the oil pan.
This pan has to be large and deep enough to hold the lube oil sufficient quantity. In a wet sump,
the oil pump sucks oil from the bottom of the oil pan through a tube, and then pumps it to the rest
of the engine.
In a dry sump, extra oil is stored in a tank outside the engine rather than in the oil pan. There are
at least two oil pumps in a dry sump -- one pulls oil from the sump and sends it to the tank, and
the other takes oil from the tank and sends it to lubricate the engine. The minimum amount of oil
possible remains in the engine.
Dry sump systems have several important advantages over wet sumps:
1. Because a dry sump does not need to have an oil pan big enough to hold the oil under the
engine, the main mass of the engine can be placed lower in the vehicle. This helps lower the
center of gravity and can also help aerodynamics.
2. The oil capacity of a dry sump can be as big as you want. The tank holding the oil can be
placed anywhere on the vehicle.
3. In a wet sump, turning, braking and acceleration can cause the oil to pool on¬ one side of the
engine. This sloshing can dip the crankshaft into the oil as it turns or uncover the pump's pick-up
tube.
4. Excess oil around the crankshaft in a wet sump can get on the shaft and cut horsepower. Some
people claim improvements of as much as 15 horsepower by switching to a dry sump.
The disadvantage of the dry sump is the increased weight, complexity and cost from the extra
pump and the tank -- but that's a small price to pay for such big benefits.
Wet Sump Oil System & Dry Sum Oil Pump
Thanks…