Engine Block Finish - Painted?

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Nacho
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Engine Block Finish - Painted?

Post by Nacho » Fri Jun 02, 2017 4:40 pm

I've exhausted my googling and searches so now I have to ask....is the FTO engine block painted out of the factory?

If not, what finish do you think it would be to prevent rust and corrosion?

And for an added bonus that I can't find an answer for.......are all engines for cars painted out of the factory?
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Re: Engine Block Finish - Painted?

Post by getonit » Fri Jun 02, 2017 5:47 pm

Nacho wrote:I've exhausted my googling and searches so now I have to ask....is the FTO engine block painted out of the factory?
I would say so.
Nacho wrote:If not, what finish do you think it would be to prevent rust and corrosion?
I would use an epoxy 2pak primer to seal and then a decent urethane colour of your choice over the top. Whilst epoxy is 100% seal it does chalk up with age so a weather type paint over the top is needed.
Nacho wrote:And for an added bonus that I can't find an answer for.......are all engines for cars painted out of the factory?
Again, i would say so. though it would be a basic flow over.
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Re: Engine Block Finish - Painted?

Post by Nacho » Fri Jun 02, 2017 6:42 pm

I should elaborate more. If I soda blast the engine block to remove all the oil/dirt/grime will it start corroding after a while?

Vectose - you recently soda blasted your cylinder head.......did you seal it with anything? Repaint?

I don't particularly want to repaint my block.....just not spend 400 hours degreasing and brushing it again like the last engine. The soda blaster is so much faster but has been known to remove paint.
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Re: Engine Block Finish - Painted?

Post by getonit » Fri Jun 02, 2017 6:49 pm

Nacho wrote:I should elaborate more. If I soda blast the engine block to remove all the oil/dirt/grime will it start corroding after a while?
If you soda blast it you will also remove the paint. All metal substrates are prone to corrosion. What answer are you looking for?
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spetz
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Re: Engine Block Finish - Painted?

Post by spetz » Fri Jun 02, 2017 11:47 pm

The engine is painted from factory yes.

Not all engine are since aluminum doesn't corrode that easily.
Cast iron (as is in this case) does corrode easily and you shouldn't leave it unprotected.

You don't need to paint your heads as they are aluminum

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Re: Engine Block Finish - Painted?

Post by Supplanter » Sat Jun 03, 2017 11:27 am

Alluminium corrodes a lot more quickly than iron, but the oxide layer that builds up prevents further corrosion.
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Re: Engine Block Finish - Painted?

Post by spetz » Sat Jun 03, 2017 12:56 pm

Corrosion in the sense of the metal's reaction to oxygen (ie, oxidation) does not happen to aluminum more quickly.

Bare aluminum can remain clean for a long time whereas bare metals like iron or steel react to oxygen quite quickly

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Re: Engine Block Finish - Painted?

Post by Nacho » Sat Jun 03, 2017 1:07 pm

Sorry the answer I'm looking for is that if I soda blast the block do I need to basically refinish/paint the block again?

So for example if I soda blast the head and decide to just leave it....am I expecting to see white rust in a few weeks like many people have on the intake plenums? Or an ever better example....if I soda blast the plenum can I leave as is? Or do I need to reprime and paint again?

I hope this makes sense
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Re: Engine Block Finish - Painted?

Post by getonit » Sat Jun 03, 2017 1:25 pm

If you soda blast the aluminum it should be ok to leave as is, usually acid washes etc will promote the white rust as you say. Giving it a wipe over with kero will help keep the corrosion at bay.
As for the block, it is cast so if you blast it and remove any paint it will corrode quickly. Not that it will rust through, just looks ugly and promotes more rust.
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Re: Engine Block Finish - Painted?

Post by Nacho » Mon Jun 05, 2017 5:10 pm

Thanks mate that's what I needed to know. I got paranoid and reprimed and painted the blasted bits anyway (plenum,tb, mounts, etc.)

But I actually didn't blast the whole block in the end......just hung the engine in the driveway and went to town 4 cans of degreaser and 6 hours later.......engine looked mint!
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