2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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rotor housing question

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Old 10-21-03, 12:10 AM
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rotor housing question

Is there a problem with using a rotor housing that was originally on the front rotor to be used for the rear of a different engine?

Thanks.
- Cooper Lacy
Old 10-21-03, 12:13 AM
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if you plan on passing emissions, then yes.
Old 10-21-03, 12:34 AM
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So is the only difference the EGR passages below the exhaust ports?
Old 10-21-03, 01:33 AM
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yes
Old 10-21-03, 05:08 PM
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The housings are identical, even down to the EGR passages, I believe.

The one small problem is that the triangle assist piece on the apex seal tends to "groove" one side of the housing, so that might be a concern for you.


-Ted
Old 10-21-03, 06:29 PM
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nope, at least on s4 models the egr passages are different. I didn't believe it at first till I sat down and compared the two. Sure enough I found it. Its a small difference, but its there.
Old 10-22-03, 12:28 PM
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Is there any problem with turning the apex seal around so the triangular corner chip is facing the other direction. I would be using new 2-piece apex seals.
Old 10-22-03, 03:17 PM
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Besides being more difficult to assemble.
Old 10-22-03, 04:00 PM
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Cooper Lacy! My brother's friend from RHIT! What's cracking?
Old 10-22-03, 04:17 PM
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Originally posted by RETed
The housings are identical, even down to the EGR passages, I believe.

The one small problem is that the triangle assist piece on the apex seal tends to "groove" one side of the housing, so that might be a concern for you.


-Ted
s5 and up will also block off the passage from the air control valve to the exhaust port if you swap them and dont drill a new hole

mike
Old 10-22-03, 04:30 PM
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Who worries about emissions?
Yeah, I remember something about some weird difference between them, but it's not something I worry about. Thanx for clearing all that up.


-Ted
Old 12-18-03, 11:19 AM
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I question then, how can you tell the difference between the front and rear rotor housing?
Old 12-18-03, 12:28 PM
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right under the licensing on each housing there should be a stamp. F for front, R for rear.
Old 12-18-03, 12:53 PM
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Originally posted by j9fd3s
s5 and up will also block off the passage from the air control valve to the exhaust port if you swap them and dont drill a new hole

mike
Are you talking s5 to s5 or s5 to s4?
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