hahah ok!!! chill everyone

 

the way i understand it, the displacement of a boinger is measured by two full rotations of the crankshaft. so that all pistons fire. but this means that all pistons are at TDC and BDC twice each. if they are just measuring the air that is taken in then it would be correct, but if they measure the displacement twice, they would get twice the actual disp.



a rotary is not a piston engine though, and while they admit is different from a piston engine they still want to measure it the same way. there are two ways you can look at it compared to a boinger. you can consider each rotor equal to 3 pistons or each rotor equal to 1 piston. the latter is correct since 1 rotor can only provide power from 1 surface at a time. NOW, the piston engine may take 2 rotations to fire all chambers but the rotary only takes 1. so measuring the displacement by two full rotations is stupid. the displacement on each face is 654. 1 rotation to fire both chambers =1308cc. measuring it as 2616cc is like saying each rotor is equal to two pistons.



boingers just cant stand the fact that we get this much power out of so little displacement, plus ridiculous rpm range.



let them "Babble" i know better than to go to SCC for my info and so should everyone here



Justin

 

No kidding, I was saying a Ford 5.0 is really a 4.9, and a true 5.0 is a 305.

 

so if i'm understanding this correctly.. in terms of 'real' displacement.. the 'boinger' method is twice the real displacement.. and the mazda method is the real displacement.. ? or do they both reflect the real displacement.. and the modification in the formula is necessary to make up for the physical differences



i'm going off of what i've understood from Muad'Dibs post

 

Actually it isn't measured that way. It is the fluid displaced as the piston moves from BDC to TDC once.



You have hit the nail on the head as to why I believe the argument comes up, though. Each combustion face in a rotary approaches the spark plugs (TDC) once per combustion event. The 4-stroke piston engine does it twice, only bringing in fresh air / fuel mixture once. Therefore the rotary moves twice as much fresh air / fuel mixture as a 4-stroke piston engine with the same DISPLACEMENT.

 

No kidding, I was saying a Ford 5.0 is really a 4.9, and a true 5.0 is a 305.

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strange...i built a 302 ford Trans-Am series motor today, then milled down a chevy to displace the same amount with a destroked crank...humm



dont make me come over there and beat you up rob

 

BTW tyson and muad dib



that is the correction factor i was talking about that mazda uses in their displacement formulae

 

iight my bad i apologize for my vulgar language.