Understanding The Rotary?
03-25-2004, 02:52 PM
#1
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Join Date: Mar 2004
Posts: 7
hey guys (girls??) i wandered over here on teh rocemendation of a friend....
ive been reading sporadically about rx7s and rotary engines for a few years
well basically im trying to understand teh difference ( physically) between a 4 port and a 6 port motor.(aside from teh obvious that one has 4 ports and one has 6.. duh) i think i grasp the idea of the path that a/f takes... from what i can gather.. it enters the motor via the irons.. and travels through a port( where porting parion of a SP or a BP is done ...i guess?).. and enters into the housings( combustion chamber).
what i;m trying to understand is physically whats teh differnece in a 4 port and a 6 port motor.... on a 4 port does the center iron have 2 ports and the outer 2 have 1 port orrr what?? and on a 6 port does each iron have 2 ports ( primary and secondary would be the proper term i assume?)
and sorry if this is the wrong forum... i figured that the building section would be a great place to address this question.
thanks!!!!
ive been reading sporadically about rx7s and rotary engines for a few years
well basically im trying to understand teh difference ( physically) between a 4 port and a 6 port motor.(aside from teh obvious that one has 4 ports and one has 6.. duh) i think i grasp the idea of the path that a/f takes... from what i can gather.. it enters the motor via the irons.. and travels through a port( where porting parion of a SP or a BP is done ...i guess?).. and enters into the housings( combustion chamber).
what i;m trying to understand is physically whats teh differnece in a 4 port and a 6 port motor.... on a 4 port does the center iron have 2 ports and the outer 2 have 1 port orrr what?? and on a 6 port does each iron have 2 ports ( primary and secondary would be the proper term i assume?)
and sorry if this is the wrong forum... i figured that the building section would be a great place to address this question.
thanks!!!!
03-25-2004, 04:01 PM
#2
Junior Member
Join Date: Mar 2004
Location: Sydney Australia
Posts: 10
In the early motors there are four inlet ports, two per rotor, of which two are in the centre cast iron plate, and there is one in each of the outer cast iron plates.
The centre plate ports are refered to as the primary ports, and the outer cast iron plate ports are the secondary ports.
The early carby engines had a four barrel carb with primary and secondary opperation, which fed the centre primary ports initially, and then the secondary ports were fed by the secondaries in the carby later in the rev range depending on load.
The six port engines had an extra port added to each outer cast iron end plate above the normal secondary ports to make six inlet ports in total.
They opperated like the early motors with the two centre ports fed first, then the two outer secondary ports are fed as the secdondary butterfly in the throttle body opens at higher rpm and load, and then higher again in the rev rnage, the 5th and 6th ports are opened by way of a rotating sleave which physically opens a path to the port.
This 6-Port concept continues today in the RENESIS engines.
The only difference is that the RENESIS also has it's exhaust ports in the cast iron centre and end plates, as opposed to there being only two exhaust ports in the early motors, one in each rotor housing.
The centre plate ports are refered to as the primary ports, and the outer cast iron plate ports are the secondary ports.
The early carby engines had a four barrel carb with primary and secondary opperation, which fed the centre primary ports initially, and then the secondary ports were fed by the secondaries in the carby later in the rev range depending on load.
The six port engines had an extra port added to each outer cast iron end plate above the normal secondary ports to make six inlet ports in total.
They opperated like the early motors with the two centre ports fed first, then the two outer secondary ports are fed as the secdondary butterfly in the throttle body opens at higher rpm and load, and then higher again in the rev rnage, the 5th and 6th ports are opened by way of a rotating sleave which physically opens a path to the port.
This 6-Port concept continues today in the RENESIS engines.
The only difference is that the RENESIS also has it's exhaust ports in the cast iron centre and end plates, as opposed to there being only two exhaust ports in the early motors, one in each rotor housing.
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