58 Tiger Cub Motorcycle

FRS 106, Michael Littman – Spring 2017


Week 7


Bottom End:

-worked on replacing the chain, ordered a new main chain (drive chain)


-took the exhaust pipe off

-began taking apart the engine, studying how it works


-put together the switch including matching all of the wires

-started looking at the headlamp and taillamp and how they worked

-started looking at the harness and thinking about how we could modify it


-worked on the gasquet and learning how it works

-will focus more on fixing the carburateor for next class


-cleaned out  the back wheel and the speedometer gear

-looked online for a new cable

-focusing on testing the speedometer and putting the back wheels together


-took apart rusted pieces

-started looking at refurbishing them or purchasing new pieces


-cleaning up the wheel parts and thinking about how to put it back together

-learning about the physics behind how the wheels work


In Class Demo: using stator and rotor with coil wire attached to light emitting diode. Stator has six coils and the gauge of each coil is different. Laminated piece of iron is placed inside coil. Lights blink as the magnet spins. → Faraday’s Law: voltage produced in coil is (see photo). Change in the flux per unit time changes the voltage across. The basis of all electric generators.

Nota Bene: Mu is independent of velocity. Friction applies at top speed and in the clutch (clutch pads pushing together)




Getting Rid of Grades gets rid of undue stress

Exercise for solving his student’s writer’s block: make her write an entire essay on just tone brick. This forced her to be creative, and write entirely her own thoughts (she couldn’t imitate someone else’s work, whereas she could with the whole city).  “the more you look, the more you see.”

Brooke Hindle, Emulation and Invention (Morse Code/Steamboat)

What is Creativity: combining ideas in new ways, so it may be worthwhile to imitate

Grades push people out of feeling valued

Graduate Students — harder for ones to come back because the lost math skills etc. BUT the come back wit passion…being in charge of yourself

Depth vs Breadth is a common dilemma in the academic works. Alot of advances are at the boundaries of fields, combining two different field

Footnotes: usually when writing you are givens set of rules but not the reasoning for it. Better composition w structure, as  long as it doesn’t interfere with your creativity.


Bottom End:

-worked on putting the engine together


-cleaned several parts, and looking at how to assemble plates of clutch

-found parts that were missing


-tested to make sure the switch worked (it did)

-tested headlamp (we are going to get a new one)

-found some new parts that we could use


-worked on cleaning and fixing the carburateur


-looking for brake, clutch and throttle cables

-looked for screws needed, looked at brake handles


-working on the seat pan and chrome pieces for shocks



-thinking about sand blasting/priming for wheel



-Research funded by Air Force/NASA/Exxon Mobil

-Air Force Work: High speed propulsion system flow s very fast have to unite it in a short amount of time

-Second Area: Gas turban =  air craft engine when you burn gasoline…the stability of the turban is the problem

-Third Area: working in combustion but want to use materials…want to make new materials for imaging and for battery

-Working to generate fine spray. Today for most battery materials, put chemicals together in oven, put millers to make it smaller, rub it into a batter. Problems: defects, cracks, can’t control size of particle

-Decision: Not allow Nasa to replace Russian engine…wanted nasa to contract it to private company…NASA focuses on deep space

-Helping with 10 year plan for space station they want to refurbish it or Russia / China will build their own. This should not happen, they get billions a year and aren’t doing anything new…they don’t need to spend tax dollars on it. This should be a company’s job. They would do better than a company, Nasa should just provide tech support.

Internal Combustion Enginer:

Detonation Engine: diesel is easy to unite, gasoline is burned by combustion. Generates heat from oil and air mixture. Engine knocking. Ideal gas law: when temperature increases, pressure increases.

Compression ratio: our motorcycle has 7-1 ratio of specific heat

Gasoline Efficiency is 28-33% energy content of fuel vs mechanical power generated

Pressue increases, huge fluctuation, then dies down…the huge fluctuation is called knocking

Octane Number: Octane 87%, 91, 93 (as you go higher it becomes anti knock) Hepta e 13%

Premium means it has higher power, so you might get knock if you use regular fuel

Aromatic Octane number of 115, Ethanol 105 can’t put too much in because of corrosion. Alcohol is cheaper alternative. High performance compression ratio you can have low octane number

Compression ratio for diesel ratio is very high, at high temperature it generates lots of NOx

Exponential temperature

Future engine: high compression ratio, but don’t want to form a particulate (NOx) – a mixture that is fuel lean, just enough fuel to consume the oxygen in the air completely

Aiming for lean condition, high pressure

HCCI homogeneous charge compression ignition

High unburned hydrocarbon, if you don’t have enough fuel, not all can burn

The higher the temperature, the more the NOx

You don’t want unburned hydrocarbon to be emitted

Such a higher efficiency 95% excessive losses are due to the heat loss. High temperature generated is lost. Future engine: better insulated to maintain heat but low temperature. Fuel lean combustion: 2 challengers: lean fuel is hard to ignite, surplus of oxygen from lean fuel…destroys the catalyst

In order to reduce NOx you can delude by air EGR exhaust gas recirculation

Supercharge run on mechanical energy not on chemical energy