JamesyCottony
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| posted on 17/8/15 at 10:39 AM |
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manifold electrolysis
Hi there,
I have an Austin Metro 1.0L engine and the exhaust/inlet manifold has rusted slightly on the outside, so I wanted to get rid of the rust and then
paint with very high temp paint. Is electrolysis safe to do on the manifold? or is it hardened steel? so would there be a chance of making it
brittle?
Thanks 
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blakep82
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| posted on 17/8/15 at 10:46 AM |
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More likely to be cast iron I'd have thought
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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JamesyCottony
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| posted on 17/8/15 at 10:48 AM |
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So you would says its ok to use this method to de-rust it?
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blakep82
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| posted on 17/8/15 at 10:57 AM |
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I don't know, I'm just pointing out its not steel, and its certainly not hardened
If its only rusted outside, and all easy access, wire brush or preferably wire brush in a grinder will give quicker results
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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JamesyCottony
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| posted on 17/8/15 at 11:05 AM |
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Ok thanks, I just thought this would get deeper into the small crevices
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MikeRJ
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| posted on 17/8/15 at 11:22 AM |
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The joined inlet/exhaust manifolds on the A series are good to prevent carb icing and to minimise the use of the choke, but they are a bit of a
disaster from a performance perspective due to the heating of the intake air and relatively poor flow characteristics.
This is why the so-called "stage 1" tuning kit for a mini (or metro) that replaces the combined cast iron manifold with separate
performance inlet and exhaust manifolds makes such a noticeable improvement to performance.
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Benzine
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| posted on 17/8/15 at 11:34 AM |
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Personally I think electrolysis is overrated! I'd take it to the local shot blasters with some universal credit vouchers (the ones with queen
liz on) and get the best possible surface to paint on to
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loggyboy
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| posted on 17/8/15 at 11:55 AM |
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You'll have no issues with electrolysis on a cast manifold.
[Edited on 17-8-15 by loggyboy]
Mistral Motorsport
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Irony
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| posted on 17/8/15 at 12:14 PM |
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quote:
Originally posted by Benzine
Personally I think electrolysis is overrated! I'd take it to the local shot blasters with some universal credit vouchers (the ones with queen
liz on) and get the best possible surface to paint on to
This is locostbuilders. Paying money when it can be done for free is frowned upon!
I have had great results with electrolysis. There are some rumours of hydrogen embrittlement but as a manifold isn't a stressed part in terms
of safety I wouldn't worry. Plenty of discussion on here if you search. Oh and don't use a Stainless Steel sacrificial part. Noxious
gases are produced if you do!
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JamesyCottony
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| posted on 17/8/15 at 12:56 PM |
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Thanks for all the help people
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Benzine
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| posted on 17/8/15 at 01:08 PM |
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quote:
Originally posted by Irony
This is locostbuilders. Paying money when it can be done for free is frowned upon!
I've had good results too with electrolysis but I prefer the wire brush attachment in the grinder or the blasters. The only time I'd ever
use electrolysis is if I was doing a restoration where I wanted to keep a rare original part. Nothing will give a better key for the paint than
blasting. £5 for the blasters vs £5 plastic tub, £15 charger, £1 for soda crystals, £35 for the osteopath after lifting a large tub of water (just me?
:p )
I still think with electrolysis that there's a large element of "something is doing the work for me while I'm having my dinner. Also
it's fizzing which is pretty, so it's better"
I'm Spartacus!*
*One of the most locost forum users
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Irony
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| posted on 17/8/15 at 01:35 PM |
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I never had much luck with Soda Blasting. I took a part into work where we have big compressors and made a DIY soda blaster using a bit of pipe etc.
I think I made more mess than anything else. i was glad I did it at work. Soda everywhere!
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Angel Acevedo
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| posted on 17/8/15 at 04:45 PM |
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Unless you go ceramic, no paint will withstand the high heat of the manifold.
With this in mind, the cheapest option would be no bother.
The next cheapest, electrolysis, and, while this may cause hydrogen embrittlement, cure for this is normally baking the parts in an oven, but, being
this a part exposed to hig heat in normal use, this would be redundant.
HTH.
AA
Beware of what you wish.. for it may come true....
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britishtrident
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| posted on 17/8/15 at 06:23 PM |
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The method of choice for cleaning it would be getting bead blasted.
Interestingly single carb Metro manifold flowed better than twin SUs.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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dilley
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| posted on 17/8/15 at 09:20 PM |
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quote:
Originally posted by blakep82
I don't know, I'm just pointing out its not steel, and its certainly not hardened
If its only rusted outside, and all easy access, wire brush or preferably wire brush in a grinder will give quicker results
100% agree.
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JamesyCottony
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| posted on 17/8/15 at 10:51 PM |
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Thanks for everyone's help, but I'm going for electrolysis as its best for me I think. Is it just sodium carbonate I need?
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JamesyCottony
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| posted on 18/8/15 at 08:55 AM |
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Are DP soda crystals ok to use? Also I can use mild steel in it can't I?
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micksalt
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| posted on 18/8/15 at 12:18 PM |
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quote:
Originally posted by JamesyCottony
Are DP soda crystals ok to use? Also I can use mild steel in it can't I?
I wasn't aware of any problems with mild steel. Stainless steel is a no-no though due to its chromium content.
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JamesyCottony
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| posted on 18/8/15 at 01:06 PM |
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Started and it's looking good!! Going to do it again tomorrow as off to work soon
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