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Quick s4/s5 housing question

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Old 10-23-05, 09:12 AM
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Quick s4/s5 housing question

This should be a simple question but i have heard conflicting answeres. Are N/A s4 housing compatible with my N/A s5 motor?
Thanks
Old 10-23-05, 01:42 PM
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Well on mazdatrix's webpage, there are two seperate part numbers for the housings between s4/s5.
Maybe the only difference is the port air locations or something?
Old 10-23-05, 05:43 PM
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Spark plug timing locations are different too. Don't mix and match.
Old 10-23-05, 06:15 PM
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yes i would think so its that way with t2's
Old 10-23-05, 08:25 PM
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soo, does it matter if the spark plugs are in differant spots? (it thats the only differance)
Old 10-25-05, 08:52 AM
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can i hear from someone who's done this? i wonder how much the sparkplug holes being in differant spots will affect the timing?
Old 10-25-05, 08:58 AM
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You can use 2 s4 housings, or 2 s5 housings in either s4 or s5 assembly. No mixing and matching, though, since the spark plug locations are different. Just as long as you use 2 of the same you're fine.
Old 10-25-05, 01:00 PM
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oh, thanks for the explination, so i guess the timming has to be adjested accordingly.
Old 10-25-05, 01:47 PM
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I also would imagine if the spark plug holes are in diff locations you need to adjust timing
Old 10-25-05, 01:59 PM
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Timing numbers in the FSM are same for s4 and s5, so don't worry about changing it.
Old 10-25-05, 05:36 PM
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iirc the s5 rotor housing have the lower spark plug moved down 2mm and tilted a slight angle over the s4
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