Ceramic exhaust coating

"Technology has probably advanced some in 40 odd years and is a little better. "

Well, maybe but my experience with using some of the two-part paints like DuPont Imron is that the original formula was much tougher than the current formula(s), probably due to environmental issues.
 
Fast Eddie said:
This was the thermal barrier coating on my head. Note you can’t see the details around the valve seats sharply, or any porosity / pitting in the casting, all because the coating was so thick (ie too thick):

View attachment 120695
Click to expand...

You hit the nail on the head with the comment of thickness of coating. All of these need to be applied as thin as possible. The acception to the rule is the abradable coating on piston skirts. Coating used on yours looks like CBC1 ceramic coating from Tech Line.
 
I got cerekote done on my combustion chambers as well. The valve faces as well as the stem on the exhaust valves. The exhaust ports too. I had to lap through the coating on all 4 valves. I also got DLC coating on the rocker shafts and the wrist pins. I recon the whole motor would have melted down at one point when I had it jetted way too lean if I had not had the heat shield coatings in place. I got a measured 70 mpg and could tell she was running way too hot!!
I wont find out how the rocker shafts did until my next tear down. But I think it was a good move.
 
maaseyracer said:
You hit the nail on the head with the comment of thickness of coating. All of these need to be applied as thin as possible. The acception to the rule is the abradable coating on piston skirts. Coating used on yours looks like CBC1 ceramic coating from Tech Line.
Click to expand...
I think that’s exactly what it was.
 
Fast Eddie said:
I think that’s exactly what it was.
Click to expand...

I am using stuff from the same company. The ceramic stuff is a bit brittle and while it can probably handle high temps it is probably not the best thing for an air cooled engine. I have used a similar coating to what I am running, this is the first time running it in an air cooled engine, but I know several fast very fast Triumphs that run this stuff.
 
I have HPC coatings on both my barrels and Mike's Maney repop exhausts. Totally happy with them.

Ceramic exhaust coating


hpcoatings.co.nz

Exhaust Heat Management • High Performance Coatings

HiPerCoat™ Fact: HPC’s Exhaust coatings have revolutionised the header industry. Our coatings are unmatched for protection against rust, cracking and burn through. The original ceramic header coating Superior corrosion protection; self-sacrificial quality willRead More...
hpcoatings.co.nz hpcoatings.co.nz
 
gortnipper said:
I have HPC coatings on both my barrels and Mike's Maney repop exhausts. Totally happy with them.

Ceramic exhaust coating


hpcoatings.co.nz

Exhaust Heat Management • High Performance Coatings

HiPerCoat™ Fact: HPC’s Exhaust coatings have revolutionised the header industry. Our coatings are unmatched for protection against rust, cracking and burn through. The original ceramic header coating Superior corrosion protection; self-sacrificial quality willRead More...
hpcoatings.co.nz hpcoatings.co.nz
Click to expand...
Different products tho I assume? Folks should remember that they want a heat barrier or insulator on exhausts, and a heat dissipator or conductor on barrels.

Your bike looks all grown up now ! When did you kit it out as an interstate? Dya like it ?
 
Fast Eddie said:
Different products tho I assume? Folks should remember that they want a heat barrier or insulator on exhausts, and a heat dissipator or conductor on barrels.

Your bike looks all grown up now ! When did you kit it out as an interstate? Dya like it ?
Click to expand...
Yes, different. The barrels are gloss and the exhaust is matte too.

It has been in this guise the past few years, since around when I put the CNW starter on.

I have had the Interstate tank since the mid-90s and ran it that way for quite a few years. The seat was bought then mail order from the UK and was very uncomfortable and.i just had it restuffed before last summer. Very comfy now.

I will likely put the alloy sprint tank back on for next Southern summer.
 
gortnipper said:
Yes, different. The barrels are gloss and the exhaust is matte too.

It has been in this guise the past few years, since around when I put the CNW starter on.

I have had the Interstate tank since the mid-90s and ran it that way for quite a few years. The seat was bought then mail order from the UK and was very uncomfortable and.i just had it restuffed before last summer. Very comfy now.

I will likely put the alloy sprint tank back on for next Southern summer.
Click to expand...
Sounds good. Nice to have different trim and to be able to swap as the mood takes yer !
 
I was going to have my 2 into 1 exhaust ceramic coated at Castlemaine, but they only do it once per month, a getting there early and waiting while they coated it would have been a pain. I would need to leave home at midnight. I would never use ceramic coating inside a motor.
 
jseng1 said:
I remember when the 4 valve Manx came out many years ago - late 1960s or early 1970s I think. They had high hopes.

See this article
https://magazine.cycleworld.com/article/1970/11/1/four-valves-for-the-manx
Click to expand...
4 valves in a Manx would probably not make much difference. I watched Steve Osko on a two valve Manx race against Ron Tombs on the 4 valve Henderson G50 Matchless, many times. The Matchless was about 2 MPH faster down the straights - it even had a magnesium piston in the motor. A Commando cylinder head is an excellent design - far superior to the Triumph Bonneville head.
 
I'm tagging on to this ceramic coating thread because I'm looking to coat the exhaust track after the valve seat to
reduce the heat soak into the head. Is this hopeless or pointless or both? It would remove any worry about
the ceramic material losing adhesion and damaging the engine such as if I did the interior of the head surface.
Any comments on this appreciated.
 
I've also used Zircotec, they are great to deal with. The parts I had done were erw mild steel which I later found out was not ideal, use stainless or chrome plated items as the coating is porous. Mine still have the coating perfectly intact but rust staining is coming through the coating.
 
Onder said:
I'm tagging on to this ceramic coating thread because I'm looking to coat the exhaust track after the valve seat to
reduce the heat soak into the head. Is this hopeless or pointless or both? It would remove any worry about
the ceramic material losing adhesion and damaging the engine such as if I did the interior of the head surface.
Any comments on this appreciated.
Click to expand...
Yes that’s ‘a thing’ that folks do. It is certainly supposed to help keep the ex gasses hot (and therefore flowing fast) and more importantly, reduce heat soak into the head. Exactly how much benefit it is in the real world I couldn’t comment on.

The hard bit will be finding a trusted vendor to apply it.

I’ve also used Zircotec, but only to coat exhausts. A friend is currently talking to them at the moment about possibly doing some motorcycle heads.

I used to use a company called Camcoat but don’t use them anymore since they did a shit job for me.
 
Onder said:
Thanks no doubt it is costly and is more race oriented. Im just trying to reduce head heating.
Click to expand...
Yes, that’s why most folks do it I’d guess. But to reduce head heating I think you’d need to do the combustion chambers as well.

What problem is it that you’re trying to solve by reducing head heating ?

I did it on my Commando coz I thought to was a ‘good thing to do’ rather than to solve any specific problem.

But after I had the coating fail, I now don’t use it on the Commando which even at 920cc and 11:1CR seems to run just fine.

So I kinda concluded that, on the Commando at least, it isn’t something that creates a problem that needs solving.
 
This relates to the old Enfield Interceptor. They have heat issues. By coating there would be some reduction in
heat soak. Compared to the Commando the valves are huge and heavy and the exhaust tracts big and not optimally shaped. The heads are huge and heavily finned but they run hot even in mild weather. In hot weather they suffer.
Perhaps I will have a go at filling in the floor ala the Fullauto Commando head.
 
Onder said:
This relates to the old Enfield Interceptor. They have heat issues. By coating there would be some reduction in
heat soak. Compared to the Commando the valves are huge and heavy and the exhaust tracts big and not optimally shaped. The heads are huge and heavily finned but they run hot even in mild weather. In hot weather they suffer.
Perhaps I will have a go at filling in the floor ala the Fullauto Commando head.
Click to expand...

If my mate gets any positive response from Zircotec I’ll let you know.

It does sound like yer ole Oilfield would benefit.

I am considering having a head done too, combustion chambers and exhaust ports (not Commando) so have a vested interest in what Zircotec may or may not be willing to do.
 
It seems to me that if the insulating, ceramic coating is applied to the combustion chambers the combustion temperature will increase leading to higher piston temperatures (and detonation?). Also, higher combustion temperature = higher pressure and the exhaust valves can be opened later.
 

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