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Aluminum Block Question #459308
09/04/09 09:09 PM 09/04/09 09:09 PM
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moparniac Offline OP
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Would you paint it or leave it bare.... what protection is there if you leave it bare so no oxidation occurs? or if you painted it whats the best route....

thx


Last edited by *WeDgiE*; 09/04/09 09:09 PM.
Mopar Performance
Re: Aluminum Block Question [Re: moparniac] #459309
09/04/09 10:07 PM 09/04/09 10:07 PM
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ahy Offline
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I would paint it to prevent that white oxidation. The right primer will help the paint stick a lot better. A self etching primer would be good and epoxy even better followed by the engine paint of your choice.

Clean first with detergent and water then solvent. Wax and grease remover, lacquer thinner and brake cleaner would work well
Re: Aluminum Block Question [Re: ahy] #459310
09/04/09 10:40 PM 09/04/09 10:40 PM
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moparniac Offline OP
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where do you get etching primer?

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Re: Aluminum Block Question [Re: moparniac] #459311
09/04/09 11:02 PM 09/04/09 11:02 PM
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Upstate NY
Bigcube Offline
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I hate paint, I prefer the "unfinished" look

Jim
Re: Aluminum Block Question [Re: moparniac] #459312
09/04/09 11:02 PM 09/04/09 11:02 PM
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Plymouth Meeting, PA
bigtimeauto Offline
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leave it alone or clear it. Mine is raw.

BB, TT5,Procharged 3300lb Street Car 4.79/154
Re: Aluminum Block Question [Re: bigtimeauto] #459313
09/04/09 11:15 PM 09/04/09 11:15 PM
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aotearoa
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two pak oven roasted here. you gotta come up close to my engine to realise it's alloy.

5463051-Picture1335.jpg (64 downloads)
Re: Aluminum Block Question [Re: bigtimeauto] #459314
09/04/09 11:17 PM 09/04/09 11:17 PM
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aotearoa
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it's been apart 5 times since i coated it. the coating sticks real well. just needs a little tlc to keep it looking good.
Re: Aluminum Block Question [Re: moparniac] #459315
09/05/09 12:52 AM 09/05/09 12:52 AM
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Bend,OR USA
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You need zinc chromate primer for aluminum, aircraft supply stores like Aircraft Spruce or Chiefs Aircarft Supplys in Grants Pass, Oregon stock, sell and will ship all the chemicals you need for painting raw aluminum properly Prepping and painting aluminum is a three or four step process at least , not a two step like steel or iron

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Aluminum Block Question [Re: Cab_Burge] #459316
09/05/09 07:31 AM 09/05/09 07:31 AM
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Quote:

You need zinc chromate primer for aluminum, aircraft supply stores like Aircraft Spruce or Chiefs Aircarft Supplys in Grants Pass, Oregon stock, sell and will ship all the chemicals you need for painting raw aluminum properly Prepping and painting aluminum is a three or four step process at least , not a two step like steel or iron



Aren't all "zinc Chromate" primers self etching? Dupont "Variprime" is the automotive version. But there are decent self etching primers that are not zinc chromate. FWIW, zinc chromate is fairly toxic and likely soon to be banned. I have used self etching spray can primers from the local Advance auto store for $4.99 a can with great success for many years for small jobs/items. A side benefit is it is removeable with lacquer thinner, where epoxy is primer is not. I wouldn't paint it unless road salt or coastal exposure is likely.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Aluminum Block Question [Re: moparniac] #459317
09/05/09 07:44 AM 09/05/09 07:44 AM
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Quote:

where do you get etching primer?



Eastwood sells it in aerosol and liquid. Automotive paint shops often have it as well.

I used the Eastwood primer on an iron block engine with lots of aluminum components and it is holding well.
Re: Aluminum Block Question [Re: ahy] #459318
09/05/09 08:52 AM 09/05/09 08:52 AM
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Norwich CT USA
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the aluminum will only oxidize if you drive your car through a salty winter road. I found out the hard way with the convertible coming back from Florida during the last week of February. I cleaned them off and they haven't oxidized in the last two years. bare aluminum heads. oh and it is machined surfaces you have to worry about. the cast portion of the heads didn't oxidize, only the flat machined ends. (Mopar "452" heads)
Re: Aluminum Block Question [Re: Defbob] #459319
09/05/09 09:50 AM 09/05/09 09:50 AM
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In The Hills
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Quote:

oh and it is machined surfaces you have to worry about. the cast portion of the heads didn't oxidize, only the flat machined ends.



mine's the opposite...the Indy intake has oxidized a little bit, the motor plate has not.
Re: Aluminum Block Question [Re: Defbob] #459320
09/05/09 10:24 AM 09/05/09 10:24 AM
Joined: Jan 2003
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Marion, South Carolina [><]
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Quote:

the aluminum will only oxidize if you drive your car through a salty winter road. I found out the hard way with the convertible coming back from Florida during the last week of February. I cleaned them off and they haven't oxidized in the last two years. bare aluminum heads. oh and it is machined surfaces you have to worry about. the cast portion of the heads didn't oxidize, only the flat machined ends. (Mopar "452" heads)



Not true. Moisture makes it oxidize. We never have salty roads here, yet mine oxidized after condensation got on it.

I just painted mine w/ Engine paint, looks great to me. CHIP

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: Aluminum Block Question [Re: an8sec70cuda] #459321
09/05/09 10:32 AM 09/05/09 10:32 AM
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moparniac Offline OP
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Quote:

Quote:

the aluminum will only oxidize if you drive your car through a salty winter road. I found out the hard way with the convertible coming back from Florida during the last week of February. I cleaned them off and they haven't oxidized in the last two years. bare aluminum heads. oh and it is machined surfaces you have to worry about. the cast portion of the heads didn't oxidize, only the flat machined ends. (Mopar "452" heads)



Not true. Moisture makes it oxidize. We never have salty roads here, yet mine oxidized after condensation got on it.

I just painted mine w/ Engine paint, looks great to me. CHIP



no primer or anything.... my fav engine paint color is rattle can "street" hemi orange

Mopar Performance
Re: Aluminum Block Question [Re: moparniac] #459322
09/05/09 10:34 AM 09/05/09 10:34 AM
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moparniac Offline OP
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this 3 week wait is gonna suck . I want my block now

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