just thought id say it: cheers for this thread, it .does. help me learn in a tad more detail whats going on inside tha engine coz previously i only knew exactly how 4-strokes worked. but yeah what was with tha earlier Q's about full circle crankshafts? seemed like people were taking tha animation a tad too seriously haha.
as you know this little animated pic does explain how these 2 strokes opperate. my reason for asking all of these questions is not to make out i,m some fantastic expert but to give the novice some understandings of this.
ok another question guys, do you think your reed engine would rev out alot better if the reeds were removed ?
no i didnt think you were asking the Q's to "make out i'm some fantastic expert" haha nah i appreciate the Q's as they help me learn =]
anyhoo no surely if the reeds were removed then the engine wouldnt have any chance of running, as there would be no compression, because as soon as the piston comes up instead of compressing the air it would push it back up the carby, yah?
cheers
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so you don,t think an engine with reeds removed would have any or less compression ? a little test is to if you ever take your carby and reed block off the case, pull the engine over and take note of the available compression. don,t forget 2 strokes have crankcase compressed pressure and also cylinder compressed pressure. this is why it,s very important to have a perfect seal for the reeds to block cage, if you look at the pic you will notice fuel / air being sucked in on the upstroke of the piston but when the piston is on the down stroke and there is a bad reed seal this compressed fuel / air will be forced back out the carby,s venturi. what effects on the engine would be possible?
thats dead right , bandit7. what happens is the fuel / air mix is sucked into the crankcase on the up-stroke and then on the down stroke all is forced straight back through the venturi. no go engine.
i know this is probably the wrong answer, but i think the main advantage is power of course and i reckon the full circle crank would add more pressure to the crank case which = more power.
very true green machine, more internal crankcase pressure results in a stronger flow of fuel / air gases. before the full circle crank was designed we only had what is still used, the half or third circle crank and the only way to decrease case volume was to whats called [ stuff the case ] this was and still is done by adding shims, filler ect to fill up space. the full circle crankshaft MUST be balanced if not your engine will vibrate badly causing both loss of power plus broken case ect ect .
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