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Old 09-24-2007, 03:47 PM
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I have a dumb question.



The front and rear rotor housings have different part numbers, what is the physical difference between the two?
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Old 09-24-2007, 04:39 PM
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EGR ports
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Old 09-24-2007, 04:39 PM
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The fresh air passages around the exhaust port. Swapping front and rear housings effectively blocks them off, and the car may be hard to get to pass emissions.
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Old 09-24-2007, 04:40 PM
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Originally Posted by Tom93R1' post='883380' date='Sep 24 2007, 05:39 PM
EGR ports




S5 and later doesnt have egr.
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Old 09-24-2007, 05:03 PM
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Originally Posted by mazdaspeed7' post='883383' date='Sep 24 2007, 05:40 PM
S5 and later doesnt have egr.






The holes you can see in the side of the LIM is where the EGR valve attaches.
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Old 09-24-2007, 05:55 PM
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Originally Posted by TYSON' post='883388' date='Sep 24 2007, 06:03 PM




The holes you can see in the side of the LIM is where the EGR valve attaches.




i stand corrected.
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Old 09-24-2007, 06:22 PM
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EGR valves are good for throwing against a wall!



Could you use a two front housings?
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Old 09-24-2007, 07:08 PM
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yeah, you can. if you look in the bottom corner of the housing, theres a passage drilled on one side of each housing, the difference between front and rear is that passage, its easy to drill a new one
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Old 09-25-2007, 12:07 PM
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Originally Posted by j9fd3s' post='883399' date='Sep 24 2007, 05:08 PM
yeah, you can. if you look in the bottom corner of the housing, theres a passage drilled on one side of each housing, the difference between front and rear is that passage, its easy to drill a new one


Thanks Mike! FD housing are hard enough to come by, now try cutting down the number available by 50% by only wanting the rear! Plus, for some reason, people are asking more for rear housings... go figure!
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Old 09-26-2007, 05:36 AM
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For some strange reason, about 90% of the FD's I've rebuilt have blown the rear, supposedly something to do with the twin turbo setup
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