Anyone tryed recoating the rotor housings with just normal chrome plating?

 

just go to autozone and buy some of their high temp chrome paint

 

I mean the walls where the apex seals seat not the outside.

 

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.

 

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.

 

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.

 

Yeh, I have heard of the housings being resurfaced, But!! i'm led to belive once the chrome is removed from the Insert there never the same and tend to wear quicker.

 

cermet coatings work.

 

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 it's good enough for the factory lemans car...

 

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..

 

24 hours consecutively between 7-9k rpm and you're asking questions?

 

so whats that a few 1000 miles

Ok i'm playing now, If it can be done i dont know squat about the prosses to rechrome them so i could'nt comment.

 

we already know the cermet works.

but why don't you just buy some brand new housings so you don't have to think about it?

 

Yes it can be re-chromed

https://www.rx7club.com/showthread.p...hromed+housing

 

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??

 

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.

 

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.

 

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.

 

What About Caribide I Know Of A Company That Bonds Carbide To Steel Like Chrome Or If The Auto Zone Method I Prefer Kentucky Chrome (silver Spary Paint)

 

sounds like what JHB performance is doing. i'm going to go with one of these companies.

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.

 

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

 

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.

 

yeah, i too feel re-chroming and ceramic is the way to go, i just want to know what's up with the people just cnc grinding the housings on that link to rotaryengine.com