Newbie Questions
11-18-02, 02:38 PM
#1
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Newbie Questions
i was wondering if anyone could explain (or point me to an FAQ) some of the following terms.
fc3s (and the difference between fd and fc)
tii (is this a *twin* turbo?)
series 4 (is this the rotary engine in a third gen rx-7)
also, what are the main differences between the engines in a first, second, and third gen rx7? what do they each redline at? they are all twin rotor, so where does the hp come from (displacement??)
with the twin turbo rotary engines, does the exaust from each rotor combine and go thru both turbos or is it possible to keep each side sepatate all the way thru the catback??
thanks for all ur help
-simon
fc3s (and the difference between fd and fc)
tii (is this a *twin* turbo?)
series 4 (is this the rotary engine in a third gen rx-7)
also, what are the main differences between the engines in a first, second, and third gen rx7? what do they each redline at? they are all twin rotor, so where does the hp come from (displacement??)
with the twin turbo rotary engines, does the exaust from each rotor combine and go thru both turbos or is it possible to keep each side sepatate all the way thru the catback??
thanks for all ur help
-simon
11-18-02, 02:47 PM
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FC3S - Second Generation RX-7 (86-92). Derived from the chassis code and VIN.
FD3s - Thrid Generation RX-7 (93 up). Same thing
TII - "Turbo II" The turbo model of the FC3S. So called because the Turbo I was made in Japan prior, and the Turbo II came next. It is a single turbo, not a twin.
Series 4 - 86-88 FC3S. Slight body and engine difference from the Series 5 (89-92) FC3S.
1st Generations, other than the GSL-SE had a 12a engine in them. GSL-SE and all 2nd gen non turbos had a 13b, while the turbos have a 13BT. 3rd generations all have twing turbo 13B-REW.
That question is probably better asked in the 3rd gen forum.
FD3s - Thrid Generation RX-7 (93 up). Same thing
TII - "Turbo II" The turbo model of the FC3S. So called because the Turbo I was made in Japan prior, and the Turbo II came next. It is a single turbo, not a twin.
Series 4 - 86-88 FC3S. Slight body and engine difference from the Series 5 (89-92) FC3S.
1st Generations, other than the GSL-SE had a 12a engine in them. GSL-SE and all 2nd gen non turbos had a 13b, while the turbos have a 13BT. 3rd generations all have twing turbo 13B-REW.
That question is probably better asked in the 3rd gen forum.
11-18-02, 02:50 PM
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Oh, I missed something.
They are all twin rotor, other than the 20b, which is a 3 rotor, and some people have swapped this engine in, however, it did not come stock in any US car. Redline is believe 7k and 9k I believe.
The HP comes from effecient design! A displacement replacement
They are all twin rotor, other than the 20b, which is a 3 rotor, and some people have swapped this engine in, however, it did not come stock in any US car. Redline is believe 7k and 9k I believe.
The HP comes from effecient design! A displacement replacement
11-18-02, 02:57 PM
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11-20-02, 04:47 PM
#7
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The TII RX-7 turbo unit is technically a single turbo, but it has a dual scroll design with an actuator which switches from a low-rpm mode to a high-rpm mode. This gives the general effect of a twin sequential turbo system. The FD RX-7 actually has two turbos in its turbo unit. Here is a link to a brochure which explains the TII turbo system:
http://www.aaroncake.net/RX-7/brochu....asp?Number=11
The horsepower comes from:
1) Displacement - The rotary engine fires all of it's displacement for each revolution of the output shaft like a 2-stroke piston engine, while a 4-stroke piston only fires half of its displacement per revolution of the output shaft.
2) Momentum - A piston engine's pistons must reverse course which wastes momentum, while a rotary engine's rotors travel in an oval pattern which is much more mechanically efficient.
3) No Valvetrain - The rotary engine doesn't have any valvetrain, which means less friction and less drag on the engine.
http://www.aaroncake.net/RX-7/brochu....asp?Number=11
The horsepower comes from:
1) Displacement - The rotary engine fires all of it's displacement for each revolution of the output shaft like a 2-stroke piston engine, while a 4-stroke piston only fires half of its displacement per revolution of the output shaft.
2) Momentum - A piston engine's pistons must reverse course which wastes momentum, while a rotary engine's rotors travel in an oval pattern which is much more mechanically efficient.
3) No Valvetrain - The rotary engine doesn't have any valvetrain, which means less friction and less drag on the engine.
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