Housing Chrome
06-16-06, 08:12 AM
#4
Senior Member
Join Date: Dec 2002
Location: Indianapolis, IN
Posts: 451
Likes: 0
Received 0 Likes
on
0 Posts
I believe the factory uses a flame spray coating of chrome molybidium, typical chrome plating is not remotely strong enough. The chrome spray paint comment was however hillarious.
06-17-06, 12:23 PM
#5
Rotary Enthusiast
Join Date: Dec 2001
Location: UK
Posts: 1,271
Likes: 0
Received 0 Likes
on
0 Posts
After this was brought up a while ago i did a little light reading. the chrome was developed just for the Rotary engine, its Porus so the oil is held to the surface better and they found if they chrome plated the Alloy Housing it came off very easy at high tems so they devised a cross hatch type fixing that a Steel insert is pressed into.
So no once its worn the housing cant be resurfaced without it wearing very quickly.
So no once its worn the housing cant be resurfaced without it wearing very quickly.
06-17-06, 05:27 PM
#6
Full Member
Join Date: Apr 2004
Location: pa
Posts: 197
Likes: 0
Received 0 Likes
on
0 Posts
rx7 specialties does, they lap the housings and then coat the with some type of coating. check it out. their site is www.rotaryengine.com for those who didnt already know.
Trending Topics
06-19-06, 01:00 PM
#9
Rotary Enthusiast
Join Date: Dec 2001
Location: UK
Posts: 1,271
Likes: 0
Received 0 Likes
on
0 Posts
yeh but for how long 
if you scrub it down to alloy it will work for a bit, but you'd only get a few hundred miles out of it, its like taking the Coating of the end plates, i've recently been shown a plate that had done 10,000 miles after it had been resurfaced and was shot!!
if you scrub it down to alloy it will work for a bit, but you'd only get a few hundred miles out of it, its like taking the Coating of the end plates, i've recently been shown a plate that had done 10,000 miles after it had been resurfaced and was shot!!
06-19-06, 05:43 PM
#11
Rotary Enthusiast
Join Date: Dec 2001
Location: UK
Posts: 1,271
Likes: 0
Received 0 Likes
on
0 Posts
so how many miles did it do between rebuilds??? LOL getting silly now, TBH I know its very hard to reproduce with the insert in the Housing, i know it can't be recromed in the housing becouse the Chroming prosses will damage the Alloy,But if it can be done cool..
06-20-06, 11:58 AM
#15
Senior Member
iTrader: (1)
Join Date: Jan 2003
Location: Edmonton, Alberta, Canada
Posts: 640
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Grizzly
so how many miles did it do between rebuilds??? LOL getting silly now, TBH I know its very hard to reproduce with the insert in the Housing, i know it can't be recromed in the housing becouse the Chroming prosses will damage the Alloy,But if it can be done cool..
Yes it can be re-chromed
https://www.rx7club.com/showthread.p...hromed+housing
06-20-06, 12:45 PM
#16
Rotary Enthusiast
Join Date: Dec 2001
Location: UK
Posts: 1,271
Likes: 0
Received 0 Likes
on
0 Posts
OK.........
I thought the mazda Chrome was a One off and porus?? Intresting you learn new stuff every day.
Just read the thread, Looks cool. Have you run one yet??
I thought the mazda Chrome was a One off and porus?? Intresting you learn new stuff every day.
Just read the thread, Looks cool. Have you run one yet??
Last edited by Grizzly; 06-20-06 at 12:52 PM.
06-20-06, 01:25 PM
#17
Senior Member
iTrader: (1)
Join Date: Jan 2003
Location: Edmonton, Alberta, Canada
Posts: 640
Likes: 0
Received 0 Likes
on
0 Posts
Yes they have been running for some time but they weren't perfect. The fixture for production chroming is 95% finished and I have 2 really good housings that will be done once the fixture is complete, then we will get serious about comprehensive long term testing. The initial housings were used mainly to see how the chrome holds up and so far everything is looking good.
06-25-06, 11:25 AM
#18
Do you feel lucky punk!!!
maybe a Nikasil coating would be the best. That is a combination of nickel and silicone, used on 911, 930, 993, 996 Porsche engines to reduce the friction and reduce the horsepower loss. Is looks like chrome. I dont know if it stick to an aluminum surface. But, maybe a search over the internet and calling some of the shops that do the works can be very helpful. In a future I will try it.
06-25-06, 04:24 PM
#19
Senior Member
Yes nikisil will work on aluminum.
These guys have been having great success with VW/Porsche cylinders
http://www.lnengineering.com/type1.html
If anyone is interested I think Charles Navarro at LN would probably be the guy to talk to there.
These guys have been having great success with VW/Porsche cylinders
http://www.lnengineering.com/type1.html
If anyone is interested I think Charles Navarro at LN would probably be the guy to talk to there.
07-06-06, 12:43 PM
#21
Originally Posted by fd rotar tt
rx7 specialties does, they lap the housings and then coat the with some type of coating. check it out. their site is www.rotaryengine.com for those who didnt already know.
the website you linked also offers a "reground housing on CNC". anyone know more about this? do they just take off chrome and not apply anything else? seems like a bad idea.
07-06-06, 05:06 PM
#22
Glassman and anouther company was working on it....but I never did find out what happened. From talking with the shop, they said they had the mazda process nailed. But this was quite awhile ago....a quick search should yeild some more info. I know the name of the company, but I'm not shure if they want to be know just yet. CJ
07-06-06, 07:10 PM
#23
Rotary Enthusiast
Join Date: Oct 2002
Location: California, Bay Area
Posts: 1,165
Likes: 0
Received 0 Likes
on
0 Posts
The cermet wont wear off, its effectivly ceramic, it will last probably longer then the chrome because of lower friction, higher hardness etc, just like ceramic seals.
Glassman knows his ****, If he's rechroming housings he's doing it properly with MPC.
Glassman knows his ****, If he's rechroming housings he's doing it properly with MPC.
