Conversation
2-stroke engines are scary

like i regard them as pretty fucking powerful and ive realised... ive never even seen one turbocharged or with more than like.... 3 cylinders
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@coolbean i still have no clue how na 2-strokes with more than one cyljnder even work
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@snacks you connect them with a crankshaft and set up the ignition so the combustion happens 180² from eachother wdym
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@coolbean how do you get air into the cylinder tho...
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@coolbean the whole crank ventilation thing i don't get how it works with multiple cylinders
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@snacks hole in cylinder wall. all on the same side opposite from the exhaust
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@snacks may or may not be connected to an intake manifold

honestly exhausts are a much more interesting question because of the expansion chambers (if you're doing those at all). the principle behind em works on a per cylinder timing basis so you have to make quite possibly the most complex exhaust manifold known to man
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@coolbean if you have 2 cylinders the volume of the crank case stays constant
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@coolbean i think with more than 2 cylinders it stays constant too? At least there's mich less change tham with one
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@snacks oh i see

i just looked it up, you use vaccuum pressure from the carburetor
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@snacks well not pressure, you use vaccuum from the carburetor to power it
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@snacks much like you would with a 4-stroke
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@coolbean doesn't the engine create the vacuum in the carb?
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@coolbean and again, in a 2-stroke that would be the crank case specifically doing any sucking action
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@snacks yes but with the sucking action from the cylinder going down, not the crankcase. this ones actually amplified by the more cylinders you have
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@snacks cause its more displacement more often
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@coolbean the cylinder in a 2-stroke never sucks. That's how it can be a 2-stroke
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@coolbean apparently the crank cases for the cylinders in inline 2-strokes just aren't connected, but i could've sworn i've seen v-configurations
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@snacks huh, thats actually funny
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@snacks huh? yea it does else it wouldnt be pulling air through the manifold
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@snacks like the pressure gradually decreases and the moment it hits the exhaust port its shwooop and new air gets sucked in
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@snacks whatever. maybe i just dont get it
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@coolbean the crank case pulls the air, compresses it and then pushes it into the cylinder during the exhaust stroke. When would you suck air into the cylinder when it only goes down while exploding
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@snacks thats way cooler however, i will say
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@coolbean like, there's nothing to push or pull it. The volume in the cylinder is under pressure rn
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@snacks back to overly complex exhaust manifold with expansion chambers. im thinking maybe do an inline engine with alternating intake/exhaust sides and a y/x pipe like you would use on a v engine in a normal configuration
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@meso @snacks also the pressure gets released when it hits the exhaust port like i said. bonus points if the exhaust port actually uses a valve in the head like some ktms do
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@coolbean fun fact: the pressure wave doesn't have to originage from the cylinder profiting from it. Na 4-strokes often use similar principles, that's why they have these whacko exhausts
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@coolbean anyway, i should prob go to sleep
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@snacks no its more than fine i get it. i overslept super hard today cause i fell asleep right before i was supposed to take my antidepressants and cue 11 hours later i woke up sweaty as all hell having kind of bizarre dreams (this one was really cool though cause like railways elevated on wooden bridges across a jungle and the railways are also used as a means to transport the construction equipment and lumber and its just super cool
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