i'll chime in here. we had my son's intake manifold powdercoated, and the
first water leak or maybe it was oil stained it.
maybe it was the powdercoating, i dunno.
my rcommendation is ceramic coating, like what they do on exhaust manifolds.
pretty impermeable, polishable, and available in many colors.
however, if its for a valve cover, i'd spend the $$ on an alloy cover . . .
----- Original Message -----
From: "Wayne Lee" <wayne@motorcarriage.com>
To: <trsix74@comcast.net>; <6pack@autox.team.net>
Sent: Monday, October 06, 2008 8:03 AM
Subject: Re: [6pack] valve cover question
> For one thing, don't powder coat the inside of your Rocker Cover.
> They have ways of masking? (Not Tape) to avoid it. You don't
> want it on the Gasket mating surface either. In my opinion Powder Coating
> such a flexible sheet metal pieces with a brittle coating
> will lead to problems and chip the first time you tighten it down. I'm
> having trouble deciding on Powder Coating an Intake Manifold
> on my 65 Land Rover 4-Cyl. to 2-Barrel Weber Manifold. I know it's been
> done
> on TR6 Manifolds, but the mass and it bolted up directly to
> the Exhaust Manifold concerns me. Intake is Aluminum and the differential
> expansion and excessive heat to the Intake I think will crack my Powder
> Coating on the LR Intake.
> If you go forward with the Powder Coating process don't worry about
> glass beading the inside of your Rocker Cover. Just degrease it so it
> won't
> smoke
> during the process. You don't want the inside coated anyway, as soon as it
> comes off, it will be heading downstream. Please let us know how You make
> out.
> I'd opt for an Alloy Cover, I've had great luck with mine. If it's going
> under the watchful eyes of Concourse judges it won't pass, but either
> should
> Powder Coating.
> YMMV!
> Cheers,
> Wayne Lee
> Douglas, MA
> 64 TR4
> 75 TR6 (daily driver)
>
> ----- Original Message -----
> From: <trsix74@comcast.net>
> To: "Bob" <yellowtr@adelphia.net>; <6pack@autox.team.net>
> Sent: Monday, October 06, 2008 7:34 AM
> Subject: Re: [6pack] valve cover question
>
>
>> In my experience, both can be good, pending how much you want to spend.
>> But the big difference will be in thr preperation. To paint, you need
>> only
>> to clean up and prep the outer surface, place it on a flat surface and
>> spray, preferably with high heat temp paint.
>>
>> With powder coating it will be neccersary to remove the steel wire
>> packing
>> and completelt degrease the inside. Glass beading alone will not work.
>> Mutiple rinses are required to remove anything and all that will be
>> detrimental to the finish. Only once all is gone, then you can powdercoat
>> and bake. The big issue is, when it is being baked. If there is any oil
>> left anywhere it will show up during the baking process and the powder
>> coating will not work. My knowledge comes from a friend who had a powder
>> coating business and did mine. 12 years later, I still listen to the
>> issues he had doing mine.
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