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Research!

Discussion in 'General Tech and Maintenance' started by NWDRVRBWE, Apr 19, 2010.

  1. NWDRVRBWE

    NWDRVRBWE Hands Off my Balls

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    hey,
    I am in the process of doing alot of research on the web and i was looking for oppinions and information on loads of odd things that i have yet to learn or understand.

    first i have been looking at camshafts:
    is this an accurate gif for the general idea of what a camshaft does?
    [​IMG]
    1. intake
    2. compression
    3. power
    4. exhaust
    Basically generates the rotations of the pistons that compress the air/fuel, while also giving the pistons a central locking or holding point so they dont go flying around in the engine.

    also what does porting and polishing improve?
     
  2. kelsodeez

    kelsodeez New Member

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    not sure if this is a question. intake, compression, combustion and exhaust is correct on the 4 stroke engine. 2 stroke is more fun though. it cuts out the middle man between intake and exhaust. instead of having valves that function from a spinning camshaft, it has reed valves that are operated by pressure within the carburetor. here is a nice little chart on how 2T works.
    [​IMG]

    also, the camshaft's duty to dictate the duration and the lift of the valves. the camshaft's rotation is generated by the crank and the crank's rotation is generated by the force of combustion. other than that, the cams and the pistons dont really have much to do with each other....unless your cam lobes have to high of a lift and you smack a piston on a valve.

    porting and polishing aides in the delivery of atomized fuel and air mixture to the cylinder by creating less air turbulence. kind of like aerodynamics for the inside of your head. the engine is just a big vacuum and the more air/fuel you can run through it, the more power you can make.
     
  3. invisibledemon

    invisibledemon Bored Moderator VIP

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    well,
    kelsodeez said things pretty well.
    the cams just essentially open the intake and exhaust valves.
    porting a head means you are widening the holes that the air/fuel travels through to get into the cylinder, and the exhaust holes to escape the cylinder.
    polishing means that you are polishing the inside of those holes to reduce the turbulence (as said).

    what you listed is essentially correct. you need 4 vital things to make an engine run:
    Air
    Fuel
    Compression
    Fire.

    in the case of a diesel engine, there are glow plugs that only operate when the engine is cold, after it warms up, the explosion basically happens from the extreme amounts of compression.

    the crankshaft is what the pistons are attached to. that is what keeps them in place and allows them to transfer power through the transmission to the wheels.

    basically it goes like this.
    you turn the ignition, and the starter turns the flywheel, the flywheel turns the crankshaft.
    the pistons start going up and down in the cylinders.
    when the crank turns, it turns the timing belt, which turn the camshafts. the camshafts spin the distributer (in models equipped with coilpack system, a cam position sensor takes this place).
    its all attached and one turns the next. without one, the other wouldnt operate.


    i probably missed some stuff there.

    also, my favorite quick description of the 4cycle engine came from my highschool automotive teacher, in direct order (and numbered like what you have up there):

    1. Suck
    2. Squash
    3. Bang
    4. Blow

    thats the cycles of a 4stroke engine.
     
  4. NWDRVRBWE

    NWDRVRBWE Hands Off my Balls

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    right, i glad i had a general idea of what i was talking about.... i hate to sound stupid on forums but i am simply learning just like everyone else did once.

    now, i have a new question, honda motors are 2 stroke right?
     
  5. invisibledemon

    invisibledemon Bored Moderator VIP

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    All cars are 4 stroke motors.
    You will find 2 strokes on a lot of dirt bikes and other small engine applications. Although a lot of those are going to 4 stroke now too.
     
  6. NWDRVRBWE

    NWDRVRBWE Hands Off my Balls

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    And I feel like a complete idiot.

    I was looking at other forums and I saw someone installing "sleeves" what are those and what is their purpose?
     
  7. NWDRVRBWE

    NWDRVRBWE Hands Off my Balls

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    as far as the diesel plugs go, I am semi aware of those because all of my friends drive diesel trucks! Most of the information I have learned about cars and turbos mainly comes from my friends with diesel trucks! I am hopeing they will be able to help me mod my car whEn I finally stumble upon the right one!

     
  8. invisibledemon

    invisibledemon Bored Moderator VIP

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    in this picture:
    [​IMG]

    the four circles joined together are the sleeves.
    that is what the piston sits in and up and down.
    the combustion happens inside this little metal condom and like a condom keeps that combustion confined to a predetermined area. lol.
    at a certain point, when you put higher compression pistons in, or are force feeding more air/fuel/nos into the cylinder, the amount of pressure becomes too great for the stock sleeves to handle, and they can and most likely will fail.

    so, people put aftermarket sleeves in, ones that are designed to handle more power, and usually ones that are already oversized to fit bigger pistons, basically, bored out.

    no need to feel like a complete idiot, never know unless you ask.
    also, you can look all of this up on sites like wikipedia and whatnot.

    yeah, but at the same time, diesels are a different category.
    but, most likely, they'll be pretty handy with little honda engines too.
     
  9. NWDRVRBWE

    NWDRVRBWE Hands Off my Balls

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    thanks for the help. i am sure there are tons of more questions i will have!
     
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