Are you being blocked from seeing Photobucket images in AusRotary posts?

Well, there is a temporary fix available in the form of a browser extension/plugin.

You can find them here:



We are working on a permanent solution that will mean all externally hosted images that are still online are hosted by us. In the meantime, try these to get the page working properly.

This announcement can be dismissed by clicking on the 'X' in the top right hand corner.

Resurfacing rotor housings

Any type of technical questions or info

Moderators: KillerRx4, orx626

Message
Author
gypsy
Rebuild Time
Posts: 1243
Joined: Wed Mar 09, 2005 5:13 pm

Resurfacing rotor housings

#1 Post by gypsy » Thu Nov 14, 2013 10:36 am

I've seen people sending away used rotor housing to a couple of places in the US to have their rotor housings "honed". I've also seen some people use a special rolling pin facing tool on rotor housing.

What are peoples thoughts on these methods ?

Reason I ask is I have a pair of good used 12a SD Rx2/3 housings with good chrome, no hint of wear around the edges but they could do with a light hone. Are there any other successful ways to do this, perhaps an oil stone ?

The housings will work as they are but if light marks can be removed, why not. In the past you'd just buy a new set but this type are impossible to find.

They'd be good candidates for spraying in a ceramic coat but from what I've seen with my own eyes I doubt there's any longevity in it. This approach is not where it needs to be at the moment in my opinion.


Rx3 / 808 inner weather strip For Sale, matches OEM profile
http://ausrotary.com/viewtopic.php?f=48&t=216254" onclick="window.open(this.href);return false;

User avatar
cam777
Rebuild Time
Posts: 1186
Joined: Mon Sep 15, 2008 12:34 pm
Location: Melbourne

Re: Resurfacing rotor housings

#2 Post by cam777 » Thu Nov 14, 2013 11:11 pm

I've been wondering whether it was worth getting mine done as they were pretty good when when I bought them (perfect chrome), I think it would be more worth doing if you had shallow gouges and chatter marks. If the chrome is pretty good then I would have thought the seals would bed in pretty well after a couple of 1000k's.
What is spraying a ceramic coat, I've never heard of it?

This pic is off the Freelance website were I got mine done, you can see if your housing looks like the one on the left then it would be worth doing. The housing on the right is from the same engine.

Image

This was my housings before they got done.

Image Image

This is after, they definitely look a lot better, feels really good too

Image Image



gypsy
Rebuild Time
Posts: 1243
Joined: Wed Mar 09, 2005 5:13 pm

Re: Resurfacing rotor housings

#3 Post by gypsy » Fri Nov 15, 2013 8:51 am

I might ask Jed when I'm ready, no rush on getting these done, they are just a spare set. I suspect he may be able to do them locally.

Is there any particular reason why you used this place instead of Goopy ? Freelance doesn't say why their process is better than others which is annoying, just the typical internet rhetoric without any facts.


Rx3 / 808 inner weather strip For Sale, matches OEM profile
http://ausrotary.com/viewtopic.php?f=48&t=216254" onclick="window.open(this.href);return false;

Nuddle
The Bug Has Bitten
Posts: 341
Joined: Mon Nov 27, 2006 8:26 pm
Location: Blaxland

Re: Resurfacing rotor housings

#4 Post by Nuddle » Fri Nov 15, 2013 10:59 am

Alex of Redline Rotary suggested that I could "Hone" the light chatter marks with 1000/1200 grade wrapped around a 25 or so mm mandrel using WD40 as a lubricant.

Seemed to work OK but needed many hours of work. You cant do a coarse then fine grade.

More concerned with water jacket corrosion. I used a surface hone plate and made sure the width was still within spec. Motors due to be started soon!



User avatar
reforme
Get a Girlfriend
Posts: 2574
Joined: Wed Jan 30, 2008 11:54 pm
Location: Central Coast

Re: Resurfacing rotor housings

#5 Post by reforme » Fri Nov 15, 2013 12:22 pm

Yup those housings look great what's the cost to get that done?


Image

User avatar
BO0557
Rotor Junkie
Posts: 5773
Joined: Wed May 21, 2003 4:32 am
Location: Was Sydney but for now outside London

Re: Resurfacing rotor housings

#6 Post by BO0557 » Fri Nov 15, 2013 9:51 pm

What's this freelance website you boys are talking about...


1972 Mazda 1300 -13bt,GT35r,jatco,hilux diff - 10.38 @ 131mph
Image

User avatar
Billy B
Searching For More Power
Posts: 1402
Joined: Fri Apr 15, 2005 7:06 pm
Location: Sitting naked in front of the computer, stalking biatches on myspace

Re: Resurfacing rotor housings

#7 Post by Billy B » Sat Nov 16, 2013 9:17 am

gypsy wrote:I might ask Jed
Very good idea, got him to do mine and yes they can be sourced locally down in Vic. You do have the best rotary shop, engineer and all round nice guy Rohan at xtreme. Maybe he may know something or do it.

Regards
Bill



User avatar
cam777
Rebuild Time
Posts: 1186
Joined: Mon Sep 15, 2008 12:34 pm
Location: Melbourne

Re: Resurfacing rotor housings

#8 Post by cam777 » Wed Nov 20, 2013 11:57 pm

gypsy wrote:I might ask Jed when I'm ready, no rush on getting these done, they are just a spare set. I suspect he may be able to do them locally.
Is there any particular reason why you used this place instead of Goopy ? Freelance doesn't say why their process is better than others which is annoying, just the typical internet rhetoric without any facts.
Somehow I got talking to Lance over email, I'm guessing he owns it hence the name, Basically their tooling is suppose to be better quality, but who knows, Goopy is probably good too.
Wasn't any real particular reason.
reforme wrote:Yup those housings look great what's the cost to get that done?
$125Us per housing but I think it's gone up to $150.

BO0557 wrote:What's this freelance website you boys are talking about...
Just google "Freelance Motorsport"



Turblown1
Mazda Approved Mechanic
Posts: 123
Joined: Tue Oct 22, 2013 9:03 am

Re: Resurfacing rotor housings

#9 Post by Turblown1 » Sun Nov 24, 2013 2:13 pm

This process is nothing new, and people have been doing it for I believe over 6 years now. Its definitely a good idea on a budget, and much better than using worn-out rotor housings, but the engine will have decrease performance compared to that of an engine with new rotor housings. If building an engine for competition use new rotor housings.



gypsy
Rebuild Time
Posts: 1243
Joined: Wed Mar 09, 2005 5:13 pm

Re: Resurfacing rotor housings

#10 Post by gypsy » Mon Nov 25, 2013 8:23 am

Why will the engine have decreased performance (from presumably lower compression) if the used rotor housings are honed correctly, flat and with no chrome missing from the surface.

More to the point, does Mazda change the composition of the hard chrome at varying thickness levels during it's manufacturing process ?

If it does then I accept your comment, if it doesn't then what's your reasoning ?


Rx3 / 808 inner weather strip For Sale, matches OEM profile
http://ausrotary.com/viewtopic.php?f=48&t=216254" onclick="window.open(this.href);return false;

User avatar
bumpstart
Uber Post Whore
Posts: 11644
Joined: Mon Jun 05, 2006 11:43 pm
Location: uranus

Re: Resurfacing rotor housings

#11 Post by bumpstart » Mon Nov 25, 2013 10:32 am

, yes,, mazda changes the housing dimensions slightly over the years to deal with the lesser offset from the centreline caused by moving from 6mm to 3mm and 3mm to 2mm apex seals

ie...post 86 housings being slightly tighter than pre 86 housings, even JHB confirm this in their papers
.. and thus the reason early rotors get face clearanced by good shops when used in late housings

as for surface treatments,, they also change over the years , first with the method of plating,, eventually evolving to a sheet metal insert
,, evolving through a couple of evolutions porous channel variations to hold lube on the surface and finally to teflon impregnation

honing the housing is going to take off the impregnated layer from FD housings
,, or going to potentially cut through all the micro channeling of FC housings
,, and at the same time reduce the pressure of the seal working on the surface for the parts of its orbit where the seal is not vertical from the surface
( ie.. the working angle of the seal is not always perpendicular from the housing surface and in these instances the pressure between seal and housing is reduced )

so,, you have reduced seal pressure,, and reduced ability of the housing to hold lubricant and will have reduced life
, the last point possibly moot when you establish that most going through this process will be using seals other than provided by mazda ,, and at boost levels beyond stock intention


when the going is hard, don't retard, remember your lubrication
27 years of rotary DIY
tech forum is for tech questions.. private message box is for private messages
paypal : bumpstart13b@hotmail.com

FreelanceMotorsports
Registered Rotor User
Posts: 3
Joined: Tue Jan 21, 2014 4:15 am

Re: Resurfacing rotor housings

#12 Post by FreelanceMotorsports » Tue Jan 21, 2014 4:34 am

Hey guys, we got here by google analytics software. We would like to thank the people with the kind words about our process. To be honest as someone stated, the process isn't new. Many people believe that goopy invented it but this is far from the truth; goopy was simply the first to mass produce it.

We can't say what companies use what processes (although we do know) but we can say that our process is the most advanced process and it uses the most expensive tooling process of anyone. The only way we can match competition prices is by refining the tooling path our machine uses to extend the tooling life.

We try to not knock other companies as some customers and public frown upon it. We can say that again that our process is of the most advanced of any company out there, no if ands or buts about it. If you do search some of our customers (shops, racers, diy engine builders) have posted pictures of competitors resurfaced housings next to ours and you can really see how much more uniform and crisp our process is.

We've done re-chroming and it's much more expensive than it's worth to offer it to the public. Core guidelines are extremely strict, the labor process is extensive, and in the long run you still have the old exterior of the housing after. We try to explain it to people as taking an old car that sat out in he field and putting a brand new engine in it; it's simply wasteful at this point and not cost effective. New York laws are really difficult so the danger is really high for us in general also (lots of toxic ACIDS!)

If you do have any questions about your housings ability to be salvaged we'll be more than happy to talk to you about it. You can even post here so that everyone else can get a little more educated on the topic.



User avatar
AndyMac
Epitrochoid Shaped Head
Posts: 1866
Joined: Tue Oct 21, 2003 4:35 pm
Location: Wrong Shade....

Re: Resurfacing rotor housings

#13 Post by AndyMac » Wed Jun 11, 2014 10:53 pm

How are people shipping their housings there and back ? Cost ?

What's the usual turn around on the process ?

Thanks


"Kids, Kids out there with not enough experience and they fu*k it all up"

-Quote : Mark Webber 2007 Jap GP.

noodles1300
Mazda Approved Mechanic
Posts: 142
Joined: Sun Jun 26, 2011 4:44 pm

Re: Resurfacing rotor housings

#14 Post by noodles1300 » Sat Jun 14, 2014 5:28 pm

Haynes rotary in New Zealand do this process would end up a lot cheaper I would think



1980rx7
Weekend Cruiser
Posts: 93
Joined: Fri Apr 08, 2011 8:24 am
Location: Geelong Area

Re: Resurfacing rotor housings

#15 Post by 1980rx7 » Sat Jul 05, 2014 7:22 pm

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?



Post Reply