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Re: Introduction
Posted: Mon Aug 19, 2013 4:52 pm
by hybrid
Liam,
this might help you
http://2-stroke-porting.com/Terminology.html
BlowDown - Measured in degrees of crankshaft rotation from Exhaust Port opening to the Transfer Ports opening.
BlowDown TA - Must allow the cylinder pressure to drop below the pressure of the fuel air mixture at time of transfer ports opening. If the Blowdown pressure is to high when transfer ports open, it will stall or reverse, the incoming charge of fuel and air.
Re: Introduction
Posted: Mon Aug 19, 2013 4:55 pm
by hybrid
To add to this also, and putting any other 2 stroke theory aside for now - you need to get the exhaust out of the engine before (or at the same time as)the new charge can come in. That goes for 4 strokes too!
So if you wait until the piston is very low to get rid of the exhaust, you will be left with very little time for the intake charge to come in. Once the piston starts coming back up, and especially once it's past your low exhaust port, the cylinder pressure is rising, and no more intake charge is going to enter.
Remember, we have one revolution for the engine to do it's entire job.
Re: Introduction
Posted: Mon Aug 19, 2013 8:25 pm
by Liam
Understood Hybrid. Cheers man, I'd still love to give it a crack. PS love your YZR500 Replica. Beautiful colour scheme aswell.
I wasn't trying to ruffle feathers I love talking with better minds. 2Tinstitute has the best job in the world.
Re: Introduction
Posted: Mon Aug 19, 2013 10:06 pm
by wheels999
Liam wrote:Understood Hybrid. Cheers man, I'd still love to give it a crack. PS love your YZR500 Replica. Beautiful colour scheme aswell.
I wasn't trying to ruffle feathers I love talking with better minds. 2Tinstitute has the best job in the world.
Hehe... ask the Institute when the NBN will be ready
