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Painting The Baffling...

 
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA
PostPosted: Sun Sep 20, 2009 7:03 pm    Post subject: Painting The Baffling... Reply with quote
Dear Listers,

I had been planning on black anodizing the various engine baffling pieces in keeping with my black-n-chrome theme under the hood. But I'm noticing that the pieces are getting pretty scratched up during all of this extra fitting that's necessary for the IO-390. Since the pieces can't be run through a surfacer first because of the bends, I'm rethinking how good anodizing is really going to look.

I know we're not suppose to power coat the 2024-T3 because the curing heat required can un-T3 the 2024, but does it really matter for the baffling? Its not really structural, per say. And if power coating is alright, what effects will the engine compartment heat have on the power coating? There's probably a high-temp power coat, but it would likely require a higher curing temp, and that get's us back to the first sentence of this paragraph... Power coating the baffling would definitely look pretty cool.

Has anyone ever chromed their baffling? That would look super cool. Can you chrome 2024-T3? How much would that cost compared to power coating?

Am I fussing too much under the hood? Wink

Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com
FWF Baffling, Intake, and Governor...

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jim jewell



Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada
PostPosted: Sun Sep 20, 2009 7:52 pm    Post subject: Painting The Baffling... Reply with quote
Matt,

Due to the weather the baffling sees I chose to use paint. With an eye
towards keeping weigh down I put on just enough to cover.
Aside from the heating issue powder coating tend to be thicker than spay
paint. Also I think the spray paint can be touched up easier.

Jim in Kelowna
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rick.mcbride(at)me.com
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PostPosted: Mon Sep 21, 2009 3:21 am    Post subject: Painting The Baffling... Reply with quote
Matt,

I powder coated the baffling on my -8 and after 500 hours and five
years have had absolutely no problem. I don't recall but I'm pretty
sure it was not a high-temp coating.

Rick McBride
On Sep 20, 2009, at 11:02 PM, Matt Dralle wrote:

Quote:

Dear Listers,

I had been planning on black anodizing the various engine baffling
pieces in keeping with my black-n-chrome theme under the hood. But
I'm noticing that the pieces are getting pretty scratched up during
all of this extra fitting that's necessary for the IO-390. Since
the pieces can't be run through a surfacer first because of the
bends, I'm rethinking how good anodizing is really going to look.

I know we're not suppose to power coat the 2024-T3 because the
curing heat required can un-T3 the 2024, but does it really matter
for the baffling? Its not really structural, per say. And if power
coating is alright, what effects will the engine compartment heat
have on the power coating? There's probably a high-temp power coat,
but it would likely require a higher curing temp, and that get's us
back to the first sentence of this paragraph... Power coating the
baffling would definitely look pretty cool.

Has anyone ever chromed their baffling? That would look super
cool. Can you chrome 2024-T3? How much would that cost compared to
power coating?

Am I fussing too much under the hood? Wink

Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com
FWF Baffling, Intake, and Governor...


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peterlaurence6(at)gmail.c
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PostPosted: Mon Sep 21, 2009 4:55 am    Post subject: Painting The Baffling... Reply with quote
Matt,

My two cents.
If you really need to paint---
I would etch,  chromic convert ( "Alodine"). Shoot a two part epoxy primer, and paint.
You did do this for the whole plane did you not?


This should be good for 2000 Hours.
Peter

[quote]
Dear Listers,

I had been planning on black anodizing the various engine baffling pieces in keeping with my black-n-chrome theme under the hood.  But I'm noticing that the pieces are getting pretty scratched up during all of this extra fitting that's necessary for the IO-390.  Since the pieces can't be run through a surfacer first because of the bends, I'm rethinking how good anodizing is really going to look.

I know we're not suppose to power coat the 2024-T3 because the curing heat required can un-T3 the 2024, but does it really matter for the baffling?  Its not really structural, per say.  And if power coating is alright, what effects will the engine compartment heat have on the power coating?  There's probably a high-temp power coat, but it would likely require a higher curing temp, and that get's us back to the first sentence of this paragraph...  Power coating the baffling would definitely look pretty cool.

Has anyone ever chromed their baffling?  That would look super cool.  Can you chrome 2024-T3?  How much would that cost compared to power coating?

Am I fussing too much under the hood?  Wink

Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com
FWF Baffling, Intake, and Governor...



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grenwis(at)aol.com
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PostPosted: Mon Sep 21, 2009 7:50 am    Post subject: Painting the Baffling... Reply with quote
Matt,

I paid $60 and had my baffling powder coated black. I had the shop just add my parts to another job they were doing to keep the costs down. Five years later and no cracks and no scratches. The powder coating really looks good on those parts. I don't think the heat treat is a big concern.

Rick Grenwis
RV-6A Denver, CO
[quote][b]

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dauscj(at)nb.net
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PostPosted: Mon Sep 21, 2009 8:18 am    Post subject: Painting The Baffling... Reply with quote
Matt,

There are some low e (low energy) powders on the market that will cure at
less than 300 deg F. So at these temps is should not artificially age your
aluminum. The powder manufactures will recommend you not exceed these temps
in the field though. I have powdered many parts that exceed these temps and
never had any issues except exhaust systems and even with them only the 1st
couple of inches fail. If you have any other questions about powdercaoting I
will do my best to answer. I have been powdercoating for about 10 years
professionally.

Chuck

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chaskuss(at)yahoo.com
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PostPosted: Thu Sep 24, 2009 12:17 pm    Post subject: Painting The Baffling... Reply with quote
Matt,
I've never chromed baffling. However, I used to own a motorcycle shop. I did a LOT of custom work for folks. Aluminum can be chrome plated. That said, it's not really a good idea. The coefficient of expansion differs quite a bit between aluminum and chromium. This means that the chrome will tend to flake off over time if the parts are exposed to temperature extremes. My experience shows that cold, rather than heat is the real problem. High humidity and cold makes it even worse. Chrome will also become a maintenance headache if you live or fly [low altitude] near salt water.
I will second Peter Laurence's earlier suggestion to Alodine, epoxy prime and paint (polyurethane) the baffle parts. Lots of RV guys here have done it with excellent results. They even paint the crankcases, sump and accessory cover like that. Alodine improves the adhesion of the primer to the aluminum. Just my 2 cents.
Charlie Kuss
Quote:
Has anyone ever chromed their baffling?  That would
look super cool.  Can you chrome 2024-T3?  How
much would that cost compared to power coating?

Am I fussing too much under the hood?  Wink

Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com
FWF Baffling, Intake, and Governor...


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