s4 s5 header? what is the diff??
06-02-05, 08:56 PM
#2
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are you talking about the stock exhaust manifold? if so, there is no difference between the 2. i believe they have the same part numbers, and are interchangeable.
but for some reason i recall mazdatrix having 2 different gaskets for S4 and S5...hmmm...
but for some reason i recall mazdatrix having 2 different gaskets for S4 and S5...hmmm...
06-02-05, 09:34 PM
#4
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yup, 2 different gaskets on mazdatrix, and they look different also!
http://www.mazdatrix.com/e6.htm
the one they have listed for the S5 NA seems to be missing a hole though...
http://www.mazdatrix.com/e6.htm
the one they have listed for the S5 NA seems to be missing a hole though...
06-04-05, 11:54 AM
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The extra hole would be to activate the 5th and 6th ports on '86 to '88, while the '89 to '91 dont have this hole as the ports are activated by the air-pump.
06-04-05, 08:53 PM
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Originally Posted by ViperBart
The extra hole would be to activate the 5th and 6th ports on '86 to '88, while the '89 to '91 dont have this hole as the ports are activated by the air-pump.
i still don't know why the gaskets would be different though.
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06-05-05, 01:51 AM
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Originally Posted by coldfire
the auxilary port activation has nothing to do with the exhaust manifold. the differences for that are found in the lower intake manifold.
i still don't know why the gaskets would be different though.
i still don't know why the gaskets would be different though.
The S4 uses exhaust backpressure to open the 5th and 6th ports so Ive heard. The port on the S4 mani would be for that.
EDIT: Check out the FC FAQ page at https://www.rx7club.com/2nd-generation-specific-1986-1992-17/faq-fc-frequently-asked-questions-2nd-generation-rx-7-a-181219/ and look at post # 4.
Last edited by FCguy; 06-05-05 at 02:06 AM.
06-05-05, 01:59 PM
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Originally Posted by FCguy
The S4 uses exhaust backpressure to open the 5th and 6th ports so Ive heard. The port on the S4 mani would be for that.
EDIT: Check out the FC FAQ page at https://www.rx7club.com/showthread.php?t=181219 and look at post # 4.
EDIT: Check out the FC FAQ page at https://www.rx7club.com/showthread.php?t=181219 and look at post # 4.
06-05-05, 04:08 PM
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The extra hole is for the EGR. PERIOD. It has nothing to do with the opening of the auxillary ports on a series four car. PERIOD. i'm on my period. humor
Exaust gas pressue FROM the catalytic converter opens the auxillary ports on a series four. Neither the airpump nor the hole in the exaust manifold have a thing to do with the opening of the auxillary actuators. See the FSM that is free and online.
Just repeating one of the posts above.
Exaust gas pressue FROM the catalytic converter opens the auxillary ports on a series four. Neither the airpump nor the hole in the exaust manifold have a thing to do with the opening of the auxillary actuators. See the FSM that is free and online.
Just repeating one of the posts above.
