New Moto Guzzi Door Mats Available Now
Oh well then-.BTW - has anybody checked the treadmill recently, to see if the bearings are properly greased ?
Is it a Guzzi treadmill ? Dusty
A 360 degree crank just means a single (common to both rods) crank pin.
So is that the case with a 650 Yamaha twin for example ?
Yes , as well as the 500 CC Hosk from which the Yamaha was developed . The Vert twins from Jolly Olde were 360% also . Technically they don't have to share a crank pin , the two pins simply have to be in alignment . Dusty
OK, For you engineering students.: May 23, 2017 6:43 AMLeft cylinder fires, engine turns to the 270 degree position and #2 fires then engine turns to the 450 degree position and # 1 exhausts and starts intake, engine turns to the 270 degree position # 2 exhaust and starts intake, engine turns to 450 position on compression and fires then engine turns to the 270 degree position and fires.These two firings are 180 degrees apart,(measured in the direction of rotation), position wise.In engineering parlance this is what is called a 180 degree firing order. First semester 101.
Keep in mind that we are not talking about ACTUAL firing degrees but the 270/450 nomenclature refers to engineering architecture only, for classification purposes.
Yeah , with all due respect to the other participants on this thread , how many of you guys are engineers ? Well , besides Kirby . Dusty
Me, I love mechanical engineering so much till I decided not to make it a career. I chose electrical & electronics engineering in university (college) instead.
Kevin Cameron is my go to guy , but Guzzi crankshafts aren't offset . That example doesn't apply in this conversation . Dusty
Hey those are familiar!Used to love to stay at the Raffles! Done all the tourist stuff and just relax.(and food!!!) Being so close to the equator no typhoons?What's the life expectancy of a new auto these days?Cheers.:-)
Unaware that it included motos! Cheaper to get a new one? (is there a cc point for the 10 yr rule?
A new one has to pay the same 10 years tax too. It is across the board regardless of the engine capacity. I would like to tell you more but let's just stay on the topic. I'll start a new topic about the costs of motorcycle ownership in Singapore
Thank you for the explanation of the 4 stroke cycle but..Read it again I was talking about the firing positions of 270/450 which are 180 degrees apart hence the engine is considered to have a 180 degree firing cycle. (response to original question from op)The 2 positions in degrees that the engine fires in a 720 cycle.Keep in mind that we are not talking about ACTUAL firing degrees but the 270/450 nomenclature refers to engineering architecture only, for classification purposes.
OK, I went back and read the original post. The question asked was why is the 270/450 nomenclature used instead of firing position values.Answer. Because using the degrees between firings the sum adds up to 720. 270 + 450 = 720. This is always true regardless of configuration. Using this method provides a check sum.If you use the firing position values they may or may not add up to 720. For the Moto Guzzi 90 degree twin the firing positions (relative to zero) are 270 and 720. 270 + 720 = 990. (Or 0 and 270)PS: I am a Mechanical Engineer, BSME and Registered Professional Engineer
WOW! Sure wouldn't want to see the thread if we were discussing something with a more complicated firing order, like a flat-plane 60 degree V-8. Or, an 18 cylinder radial. Or, a 9 cylinder rotary.....Anyways, I'll take an AR10 over an M14 ANY day!
This firing order stuff is more or less an abstract problem...I have a hard time with abstract but not looking at real life stuff...Visualizati on of a P&W R2800 is no problem because I have seen the parts in person...
How's the fishing in rural N.Y. Tony ? Dusty