[s-cars] To ceramic coat or not

[Mark Strangways]

I can understand where you want turbulence or anti-reversion tactics at / 
near the cylinder head, but I wonder what can be gained from sticky surfaces 
in the exhaust system past the point where anti-reversion makes a positive 
effect.

I may be wrong, but that's how I would expect things to work
----- Original Message ----- 
From: <manuelsanchez at starpower.net>
To: <djdawson2 at aol.com>
Cc: <s-car-list at audifans.com>
Sent: Friday, January 06, 2006 1:01 PM
Subject: Re: [s-cars] To ceramic coat or not


> Dave,
>
> thanks. that's what I love about the list, often makes me
> think counter to what I had originally thought. The turbulence
> helping flow as opposed to hindering is a case in point. Seems
> to make sense when I think about it in terms of what I had
> heard about porting heads.
>
> Thanks again for the info on your own ceramic coating
> experience, it reinforces an opinion I'm forming. I bought a
> ceramic coated header for my truck (got tired of the warping
> EM and broken studs so I thought what the hell). It came
> coated from the vendor, and I'm not sure who did the coating,
> but after a few months large sections on the cross over pipe
> flaked off.  I'm glad (but really sorry) it wasn't just me.
>
> -manny
>
> ---- Original message ----
>>Date: Fri, 06 Jan 2006 11:13:13 -0500
>>From: djdawson2 at aol.com
>>Subject: Re: [s-cars] To ceramic coat or not
>>To: manuelsanchez at starpower.net, s-car-list at audifans.com
>>
>>   I'll give you my 2 cents worth.
>>
>>   I had my header Swain coated 1 year and 2 months
>>   ago...and 36k miles ago... and only on the
>>   exterior.  It has held up fairly well, but
>>   significant sections have become bare.  With that
>>   alone in mind, I wouldn't consider coating the
>>   inside of a header or downpipe I owned.  If it
>>   doesn't last on the outside, it can't have a prayer
>>   on the inside.
>>
>>   As far as flow is concerned... there exists a good
>>   arguement in support of "surface turbulence"
>>   improving flow rather than hindering it.  However,
>>   if the DP is 3" (or more), I doubt you could ever
>>   tell the difference in power output.
>>
>>   Dave
>>
>>   -----Original Message-----
>>   From: manuelsanchez at starpower.net
>>   To: s-car-list at audifans.com
>>   Sent: Fri, 6 Jan 2006 08:22:04 -0500
>>   Subject: [s-cars] To ceramic coat or not
>>
>> S-heads,
>>
>> Thanks for the input so far.
>>
>> I thought I had recently seem some opinions about coating the
>> inside of components;
>>
>> 1. There was a concern that as the ceramic coating flaked off
>> or deteriorated, that the bits would lodge in downstream
>> components, such as the kitties.  Do these coatings
>> deteriorate quickly, slowly?  How do they deteriorate? Is this
>> a valid concern?
>>
>> 2. Interior coating is not "smooth" as the uncoated metal,
>> presumably this would disturb the flow.  Do the benefits of
>> keeping the heat from the metal outweigh the diturbed gas-flow?
>>
>> Look forward to your input.
>>
>> -manny
>> 95.5 UrS6 Avant
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