engine sizing??

[james]

now then, something ive never really undestood, is this engine sizing bollox?
without getting all complicated, and going into algebraic (spelling?) equasions, explain to me please what exactly the 12b, 13b,and 20b engine sizes are?
why they are called that if its not 1200 cc, 1300cc and 2000 cc?
and why all sorts of people, dvla included come up with what seams like random figures of engine size?

got the engine size thing sussed now, but why on log books are they logged as nearly 3 ltrs??

[Carl]

Join up and we\'ll tell you!
The info is top secret unless you are a member!
Regards
Carl

[james]

aw you git
what dya do to become a member, thought i was wheneber i signed up to the forum ages ago?

just found some info that its 654cc per rotor, so whats the dvlas thing all about??
come on tell me PLEASE

[james]

ha ha just joined
tell me all i want to know, and dont keep anything from me or else :wave

[peterch]

654cc x 2 rotors = 1308cc. x2 because it displaces twice as much air = 2616cc, I think.

[james]

makes sense!
but cc is cubic capacity, if it displaces more air, is this increasing the cc? no its not is it, si how do the dvla manage to record it with bigger cc then?

so whats the difference in injectors, and when should they be upgraded?
ta

[peterch]

just a way of getting more car tax out of us. Some rex owners have there documents showing 1308cc, just the luck of the draw.

[james]

so when i plant my rx engine in my beetle, i should be able to still swing it as a 1300, although its tax exempt any way, just thinking insurance, although, dont suppose ill be that lucky :rolleyes:

[peterch]

You will probably get away with it, yes. All depends on who you speek to at the dvla.

[johnf]

No insurance company will see a rotary engine as 1300 - with all that performance, they\'ve done their homework..............

John

[Carl]

Hi James,
Glad to see that you have joined up.
The cc of one rotor chamber is 654cc for a 13b.
There are 2 rotors and in one revolution of the crank (Eccentric shaft) 1308 cc is used for making the power cycle,but in a 4 cylinder 4 stroke engine if power was made by 1308cc in one revolution then it would be infact a 2616cc engine,as two cylinders are not making power during that one revolution of the crank.
Regards
Carl

[james]

pah
insurance whats it all about any way??
http://www.mazda.com/history/rotary/e2-1.html
just found on here chamber volume is 672 not 654
everone has somethin different to say :rolleyes:

[peterch]

obvious when explained as well as that,
thanks Carl.

[Carl]

pah
insurance whats it all about any way??
http://www.mazda.com/history/rotary/e2-1.html
just found on here chamber volume is 672 not 654
everone has somethin different to say :rolleyes:

That is wrong,they have made a mistake.
It is 654cc per chamber on the 13b.
Regards
Carl

[james]

i can believe its a mistake, as there is spelling, and misstypes all over the place, quite informative though!

so the carl, how much for a 20b engine then??
and can you explain the different uses of injectors?
please