Midterm Review R. Bortignon.

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Presentation transcript:

Midterm Review R. Bortignon

Piston port timing VS 4 stroke valve timing 4 stroke engine piston port engine

2 Stroke Diesel Engines 1 Compression Power Exhaust Scavenging

2 Stroke Diesels VS 2 Stroke Gas Engines

Diesel Engine Operation diesel’s have higher thermal efficiency than gasoline engines in a diesel, thermal efficiency goes up with increased engine load

Main difference between diesel & gasoline injection?

Gasoline Injection maintains a nearly constant 14.7:1 air-fuel ratio the volume of air & fuel is varied to change engine power output during heavy engine loads (low manifold vacuum) more air/fuel is delivered to the cylinders during light engine loads (higher manifold vacuum) less air/fuel is fed to the cylinders

Reminders… drop off completed mechanical labs in my box fill in “engine info” sheet on the last engine you worked on fuel must be drained out of fuel tanks engine stand brackets need to be removed Engine Assessment Guide due this week! should be generic, not manufacturer specific should be applicable to both 2 or 4 stroke 1 assessment guide handed in per team of 2 “Engines of Unknown Condition” activities moving away from lab based activity to examining & evaluating engine condition use your assessment guide on the engine bringing your own engine in? Peter or I must see it at least twice – once when it comes in, once when it leaves engine must run – you will use the machine as it was intended Peter, James, Phil & I will keep daily notes on your progress

Reminders… 100 Hour Project do NOT dump off parts in the auto shop or its parking compound consult with me 1st for large items that need to be left in the shop motorcycles, riding mowers should be pressure washed 1st all fuel should be drained & dumped into the black barrel outside the shop labeled “Stale Gas” you are welcome to dismantle, clean & examine/modify parts any time I am in the shop & you have free time

Scrap Metal Bin any & all scrap metals should be placed in here… large pieces need to be cut up or properly stacked so volume is maximized bin is NOT a garbage can!