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

Wear on outside edges of housing

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Old Aug 29, 2015 | 02:03 PM
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Danny 171's Avatar
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Wear on outside edges of housing

Hey guys!

After the last housing I bought was junk, got a new one from someone as an exhchange and it looks like this. It goes all the way around on both edges of the housing and there's a slight step down in one or two spots. What caused this and is it usable? I'm having horrible luck with this

Wear on outside edges of housing-image-3946892561.jpg
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Old Aug 30, 2015 | 06:23 AM
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unfortunately lots of people pass off junk rotor housings as good.
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Old Aug 30, 2015 | 10:15 AM
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Not really usable.

Caused by the corner apex seal piece. Then they take apart the engine, flip the seals over, and wear out the other side of the housing.
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Old Aug 30, 2015 | 11:23 AM
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So it's yet another scrap housing?
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Old Aug 30, 2015 | 02:28 PM
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could be resurfaced for better compression results but for the wear amount i would say its not worth it.

save it for a race engine, it will still work but the compression won't be very good with that housing.
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Old Aug 30, 2015 | 02:40 PM
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Originally Posted by Lyger
could be resurfaced for better compression results but for the wear amount i would say its not worth it. save it for a race engine, it will still work but the compression won't be very good with that housing.
We were building it for racing anyway. Would you really suggest using a housing like that in a race engine?
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Old Aug 30, 2015 | 02:45 PM
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roTAR needz fundZ
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Wear on outside edges of housing

Why not? Your going to get the RPMs most of the time, may just be a hog to start hot
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Old Aug 30, 2015 | 03:12 PM
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in an n/a you can just run it, for a turbo i'd recommend a bit of break in until the compression peaks before trying to beat on it. i'd also probably recommend some decent used 2 piece seals versus wasting money on new ones.
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Old Aug 31, 2015 | 12:48 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by Danny 171
We were building it for racing anyway. Would you really suggest using a housing like that in a race engine?
depends on what you mean by race.

sealing = power, so if you want power, and reliability you should just buy new housings.

if racing = unreliable POS, than use these housings
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