Fuel Injections Flashcards
Lubricating Properties
the lubricating quality of fuel must help reduce engine and fuel system wear
Operation during low temperature conditions
diesel fules contain wax like molecules, that solidify at low temperatures
good fuel economy
increasing density of fuel will increase its heat contact and improve fuel economy
starting ease
diesel fuel needs to ignite at low temperatures and pressure found in the combustion chamber during cranking
Flash point
the temperature where fuel must be heated to produce a vapour that will ignite when exposed to sparks or open flame
Two types of nozzles
Hole and Pintle
Cetane Fuel
Runs good in cold weather
Diesel rating
Octane Fuel
Gas Rating
Winter Fuel Pour Point
-44C
Summer Fuel Pour Point
-23C
Volatility
How quickly something vaporizes than burns
Stoichiometric
(Air/Fuel mix) makes sure all fuel burns
14.7:1 = Gas
Isopropyl Alcohol
Helps diesel fuel not freeze Absorbs water (Base for diesel Additives)
Cloud Point
Temperature at which wax begins to give fuel a hazy or milky look (plugs filters with wax Particles)
Ratio for Air to fuel
20:1
White smoke
Happens when cranking engine
Un burned fuel
Black smoke
Over burned fuel
Air to fuel Mixture is wrong
too much fuel too little air
Blue smoke
Occurs from oil contamination
Swirl
Helps combustion and mix fuel in cylinder
Port closure
Is the beginning of injection
Fuel Metering
Measures the correct quantity of fuel required for any given engine speed
Actions occurring in the injector
pressure and metering
Paraffin
wax-like compound
Effective Stroke
The time the plunger is injecting
Auto-ignition temperature
The temperature at which fuel will ignite when heated
Lubricity
A fuel’s lubricating quality
