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Old January 13th, 2009, 10:01 PM   #1
1965aaron
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Default painting an engine case
Re:: is it bad if you do   

i dont see many ppl painting vw engines
is it just because its unneeded because magnesium and aluminum doesn't rust?

or is it bad for the engine
runs hotter maybe?


idk
just wondering if i can without causing injury
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Old January 13th, 2009, 11:28 PM   #2
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Default Re: painting an engine case

I would say that the reason for not painting the cases is mostly that the magnesium is sort of porous and in time the oil will "wet" through the case. Not leaking but making it greasy and resulting that the paint will not stick to it.
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Old January 14th, 2009, 03:23 AM   #3
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Default Re: painting an engine case

There's a good resource HERE...

It explains how to paint it so it doesn't bleed through...

& this is another page that tells how to prep the Mag...

Hope it helps!
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Old January 14th, 2009, 05:16 AM   #4
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Default Re: painting an engine case

Does not cause any problems but it will come off and really does not look good once it does.

yeah mine was painted and now it look like hell.
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Old January 14th, 2009, 05:24 AM   #5
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Default Re: painting an engine case

I don't see the benefit of painting the case, seeing you won't see much of the case once the tins are on the engine anyway. I say just clean the case as good as you can. Maybe concentrate on the part of the case that does show once the tins are in place. That way it will look nice & clean once the tins are on.

Make sence?
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Old January 14th, 2009, 05:27 AM   #6
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Default Re: painting an engine case

I don't care how or what you do to it, it WILL be covered in oil!
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Old January 14th, 2009, 05:30 AM   #7
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Default Re: painting an engine case

Just wash it ever day or two.

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Old January 14th, 2009, 05:33 AM   #8
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Default Re: painting an engine case

Air brush oil leaks on the case. then when they ask is it leaking ..... you can tell them only your painter know for sure !
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Old January 14th, 2009, 07:02 AM   #9
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Default Re: painting an engine case

ok
not gonna paint it
i was just wondering
cause i plan on selling my rebuilt engine in the somewhat near future as a longblock
and i figured it would look better painted

but you've convinced me otherwise
thanx for all the inmput!
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Old January 14th, 2009, 08:24 AM   #10
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Default Re: painting an engine case

just remember......the lighter the color, the faster it will run
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Old January 14th, 2009, 08:40 AM   #11
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Default Re: painting an engine case

Quote:
Originally Posted by vwfanatic View Post
just remember......the lighter the color, the faster it will run
Yeah... PINK makes it run the FASTEST though!
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Old January 14th, 2009, 10:24 AM   #12
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Default Re: painting an engine case

Paint it flat black .. it'll aid with cooling and if it peels you'll not likely see the difference by the time it does ...

You want to be fancy ... polish the strengthening rib edges to hilight the blackness ... they don't leak anyway ...
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Old January 14th, 2009, 08:58 PM   #13
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Default Re: painting an engine case

paint is for freakin concours freaks and samba asses. bare metal always looks best! besides your engine stays cooler i think vw would have painted them. i mean every other car at the time had a painted block. of course those were cast iron.....yeah
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Old January 14th, 2009, 09:26 PM   #14
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Default Re: painting an engine case

Man if you paint it, how are you to find your way home now that it doesn't leak all over the place!
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Old January 15th, 2009, 09:29 AM   #15
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Default Re: painting an engine case

Cool article Shorty,but it does seem like a waste of time. Gasoline to flatten gloss black now that just sounds fun
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Old October 31st, 2011, 01:13 PM   #16
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Default Re: painting an engine case

Hmm. Good articles here.
I first was thinking that I'd paintstrip the porsche engine and just clean the case but also have been thinking I might want to paint the visible magnesium details same flatblack as the engine coolingtin...

The camgear covers have some pits so they will not look that good if polished in any case..



Here with paintstripper on as the PO had painted them with some spraycan silvermetallic that is now flaking off....

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Old October 31st, 2011, 04:58 PM   #17
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Default Re: painting an engine case

I have painted dozens of VW engines without any problems with the paint peeling. I always paint them flat black. Sending a picture of a painted 1835 CC VW engine that is in my little single seat homebuilt Cub airplane. It runs a little cool, if the temp is 70 deg or less, I have to block air that goes to the oil cooler( red hoses). Cruise is 80 mph @ 2700 rpm, burns 3 gph. Also if you put the engine together right, and use a straight weight oil like the VW owners manual says, you shouldn't have any oil leak problems. Pop
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Old November 1st, 2011, 07:26 PM   #18
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Default Re: painting an engine case

Gex used to (or still does) paint their cases to cover up their shitty work.
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Old November 3rd, 2011, 02:04 AM   #19
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Default Re: painting an engine case

I have also painted a couple engine cases flat black with no noticeable problems, that is until all the cooling tin was taken off, then you could see where it was starting to peel off



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Old November 6th, 2011, 04:47 AM   #20
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Default Re: painting an engine case

I painted mine. I used self etching primer( I know the article say not too) and engine enamel. 4 yrs later when I took it apart to fine that the wrist pin clip broken was the cause of my shortened holiday, it was fine. There where a few rub marks from the tins but that was it.
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Old November 6th, 2011, 09:33 AM   #21
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Default Re: painting an engine case

I was also thinking about testing the etchprimer and some kind of thin enamel or similar over the primer..
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Old November 6th, 2011, 11:23 AM   #22
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Default Re: painting an engine case

I have always painted mine. I've never had heating issues. The only one that I had the paint peel on was one that sat in a baja for the twelve years I owned in. And my most recent engine was built in '99 and painted with NASON GM White (I believe the code is LM001) and it's still looking good and holding up fine to this day.

I'm not a "concourse freak" and pretty much anyone here who knows their ass from a hole in the ground knows how I feel about "samba asses".....

Actually, if you paint the case and then apply a high quality wax to the clear coat, mud, dirt, grease, and such things are easier to wash off and thus your engine "can" run cooler and last longer.

The biggest reason for most people not wanting to paint the case is that they believe that an air cooled engine can't be painted. This is not true. The case does very little of the cooling. The jugs and heads do the majority of the cooling.

But what do I know....
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Old November 6th, 2011, 03:15 PM   #23
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Default Re: painting an engine case

paint it with oil... then when it leaks it just blends in
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