probally a dumb question
did a carborated 13b ever come stock in a 1st gen rx7?
i did try a search but all i came across was swap info. it didnt answer the question. |
no, only the GSL SE had a 13b and they were all fuel injected.
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If you see it in something beside for a GSL-SE it was upgraded to the larger motor!
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the REPU had a stock 4 port carbed 13B
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was there even a carbed 13 then?
other then the REPU... btw what is that? |
i was under the impression that some of the other rx models had 13b carbs in them
i also thought some of the upper spec jap rx7s had 13b engines in them i dont know where i saw this i could very well be wrong |
The RX-4 Luce, REPU, and RX-5 Cosmo were all carburated with 4-port 13B's.
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Originally posted by high-RPM i was under the impression that some of the other rx models had 13b carbs in them i also thought some of the upper spec jap rx7s had 13b engines in them i dont know where i saw this i could very well be wrong japan got 12at's |
your correct, no JDM SA had a 13b, the best was a 12AT
REPU means Rotary Engine Pick up |
Originally posted by 82transam your correct, no JDM SA had a 13b, the best was a 12AT REPU means Rotary Engine Pick up would there be a diffrence in the truck engine and an rx7 engine? (i.e. stronger housings, higher compression) |
Originally posted by xenophobe thanks for the long hand :D would there be a diffrence in the truck engine and an rx7 engine? (i.e. stronger housings, higher compression) |
The sizes of the intake ports are different, and for different years.
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Originally posted by cosmicbang The sizes of the intake ports are different, and for different years. sorry im pretty new to this whole rotary engine thing. |
yea, so what gives?
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6 ports use 2 ports that open at higher rpms for more duration
they close at low rpms so they dont hurt torque rotary VTEC if you will |
In stock form the 6-port motors make more power than the 4-port ones, and have a more useable powerband. Unfortunately, the 6-port motors are difficult to port, and the benfit of porting is less than the 4-port engines. In short, the 4-ports more power with porting than the 6-ports.
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Originally posted by wwilliam54 6 ports use 2 ports that open at higher rpms for more duration they close at low rpms so they dont hurt torque rotary VTEC if you will |
Originally posted by fatboy7 In stock form the 6-port motors make more power than the 4-port ones, and have a more useable powerband. Unfortunately, the 6-port motors are difficult to port, and the benfit of porting is less than the 4-port engines. In short, the 4-ports more power with porting than the 6-ports. now the question is were there 6 port 12a's? (so i know to try and avoid them if there are) |
Originally posted by xenophobe do the ports open with vaccum or are they opened mechanicly with rpm? |
Originally posted by xenophobe so if i wanted to make more power then stock i would be better off finding a 4 port motor? now the question is were there 6 port 12a's? (so i know to try and avoid them if there are) |
Originally posted by 1stgen4life All 12a engines were four port I believe. If you get a 6 port 13b, you can swap the housings with those from a 12a. That way you can have a four port 13b that is ready to be street ported, or any other kind of porting you want. Correct me everybody if I'm wrong. |
So you are saying that a 13 B motor with pre 86 housings (4 port design ) compaired to a 6 port 13B, once each is ported; the 4 port design will make more power and tourque and have a better power band assuming good engine management, intake and exhaust
is not the 13B 60 port designn better to start with? and in the end you will getr more out of it? |
Originally posted by two79rx7's So you are saying that a 13 B motor with pre 86 housings (4 port design ) compaired to a 6 port 13B, once each is ported; the 4 port design will make more power and tourque and have a better power band assuming good engine management, intake and exhaust is not the 13B 60 port designn better to start with? and in the end you will getr more out of it? turbos are 4 port the prefered way to make a 4 port is to take 12a plates and 84/85 13b rotor housings 4 ports generally have more top end, but low end suffers the 6 ports dont go as high, but are more drivable and hvae more low end |
If I am right first the 84 -85 13 B from the gslse is a 4 port, that was said above too.
what is the advantage of using 12a plates? the 90 13B 6 port puts out about 165 or so Horse power stock compaired to 135 HP for the 4 port 13B gsl se motor so you are saying the 4 port once ported well will have a higher peak output power at the top end than a 6 port could ever have once ported well too? |
Originally posted by two79rx7's so you are saying the 4 port once ported well will have a higher peak output power at the top end than a 6 port could ever have once ported well too? and 12a plates are cheap |
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