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 Post subject: Re: Resurfacing rotor housings
PostPosted: Mon Jul 14, 2014 6:30 pm 
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Location: Geelong Area
1980rx7 wrote:
Great thread im getting my hands on a 12a turbo in bits soon,seal marked the housing hope the rotor is ok, if its marked up can the rotor be cleaned within reason?


I assume this is the H people talk about on top of the 12A housing they look pretty scored up bit of chrome missing any one do resurfacing in Aus ?


Attachments:
12A score scuff marks.jpg
12A score scuff marks.jpg [ 31.36 KiB | Viewed 3943 times ]
Chrome flaking away.jpg
Chrome flaking away.jpg [ 28.24 KiB | Viewed 3943 times ]
12A housings.jpg
12A housings.jpg [ 27.06 KiB | Viewed 3943 times ]
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 Post subject: Re: Resurfacing rotor housings
PostPosted: Mon Jul 14, 2014 6:47 pm 
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think those are done.. your best bet may be FC 13b housings that are edge worn and take them down 5mm each side and get them grooved again for water seal and o ring

( thinks there is several places doing this now, ...try extreme )

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 Post subject: Re: Resurfacing rotor housings
PostPosted: Mon Jul 14, 2014 9:28 pm 
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bumpstart wrote:
think those are done.. your best bet may be FC 13b housings that are edge worn and take them down 5mm each side and get them grooved again for water seal and o ring

( thinks there is several places doing this now, ...try extreme )


cheers....
so should i ditch em?


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 Post subject: Re: Resurfacing rotor housings
PostPosted: Tue Jul 15, 2014 1:30 pm 
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Rebuild Time

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I think without bumpstart spelling it completely out then the answer is a definite yes !

Not only is there chrome peeling meaning that they are on their very last legs, the scores appear in what I believe is the critical compression area between the intake and the plugs.

Unfortunately they are not even heavy enough to be used as boat anchors, best place in the weekly recycle bin :laugh:

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 Post subject: Re: Resurfacing rotor housings
PostPosted: Tue Jul 15, 2014 5:54 pm 
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gypsy wrote:
I think without bumpstart spelling it completely out then the answer is a definite yes !

Not only is there chrome peeling meaning that they are on their very last legs, the scores appear in what I believe is the critical compression area between the intake and the plugs.

Unfortunately they are not even heavy enough to be used as boat anchors, best place in the weekly recycle bin :laugh:


ahhh yeah.... was thinking ill see if they can be resurfaced.


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 Post subject: Re: Resurfacing rotor housings
PostPosted: Tue Jul 15, 2014 6:24 pm 
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 Post subject: Re: Resurfacing rotor housings
PostPosted: Tue Jul 15, 2014 7:45 pm 
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NANCY wrote:
south coast rotary


Cheers mate


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 Post subject: Re: Resurfacing rotor housings
PostPosted: Sat Jul 19, 2014 6:52 am 
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Joined: Tue Jan 21, 2014 4:15 am
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1980rx7 wrote:
1980rx7 wrote:
Great thread im getting my hands on a 12a turbo in bits soon,seal marked the housing hope the rotor is ok, if its marked up can the rotor be cleaned within reason?


I assume this is the H people talk about on top of the 12A housing they look pretty scored up bit of chrome missing any one do resurfacing in Aus ?


We've worked on far worse housings than these. The flaking in the bottom portion of the housing isn't too bad as long as you switch to a one piece apex seal or put the corner piece on the other side of the rotor housing to prevent further flaking.

The damage to the one housing (apex seal scoring) can be minimized if the areas are not too deep. The pictures are not perfectly clear but it doesn't look like they are really that bad. You're more than welcome to contact us with better pictures and we'll give you a better idea.


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 Post subject: Re: Resurfacing rotor housings
PostPosted: Tue Jul 22, 2014 12:15 pm 
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I can vouch for Xtreme on this as I've used a few sets that they've done. It's a 5 step process unlike others that do them. They are first cut down just under 5mm in the Cnc then into the surface grinder to get exactly 5mm and to ensure they are flat end to end the back in the Cnc for the other side and back into the surface grinder. Then back to the Cnc for water seal grooves. These housing also have "Mazda 12a" recut into the tops too.
Unfortunately late housings (post 86) cannot have water seals cut into them as the outer is to close to the exterior of housing and may blow through with casting variations.
Cheers
Jed

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 Post subject: Re: Resurfacing rotor housings
PostPosted: Tue Jul 22, 2014 12:27 pm 
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that is interesting about the water groove.

though the few times i advocated for the trimmed down housings they have been for 12C engines using the FC plates

i expect in this situation then extreme may instead groove your existing plates to upgrade them to a post 86 spec
as the only way to ensure you can keep that early block and still find a reasonable supply of housings

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 Post subject: Re: Resurfacing rotor housings
PostPosted: Fri Oct 27, 2017 7:52 pm 
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Image

Image

s5 housings . 12a style. there is between 1 and 2mm behind the outside water seal top edge and the outside shoulder lip . if the seal is relocated on a slightly lesser radius , then a fair bit more

i dont see the issue on these but it is possible if you ran a batch one or two may be on the thin side

the next couple sets i will get done will move the inside water seal around a potential monster port

thanks to Hugo for machine work

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 Post subject: Re: Resurfacing rotor housings
PostPosted: Sun Nov 12, 2017 12:12 am 
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Image
Image

progress pics

this one will be slimmed to 12a like above and has a little further to go .
should be able to lose the edge scratches in that process so from here just needs the polish stage

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 Post subject: Re: Resurfacing rotor housings
PostPosted: Mon Nov 13, 2017 1:47 am 
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Image
Image
test2


Image
test1 ( housing in post above )


Image
both housings together. ex garden ornament. painting dummies

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 Post subject: Re: Resurfacing rotor housings
PostPosted: Mon Nov 13, 2017 10:42 pm 
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Joined: Sun Mar 05, 2006 6:45 pm
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Nice work.

Is there anyone eastern seaboard doing this commercially? Not listed on xtreme website.


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 Post subject: Re: Resurfacing rotor housings
PostPosted: Tue Nov 14, 2017 10:13 am 
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nope

but there might be a few furiously trying to make a jig now i slipped out a vid :lol:

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