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10-23-2015, 11:24 AM | #1 |
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corrosion around aluminum motor plate coolant holes
Racers,
any suggestions to limit this corrosion?
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Larry Woodfin 471W |
10-23-2015, 11:51 AM | #2 |
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Re: corrosion around aluminum motor plate coolant holes
It appears you are experiencing Electrolysis.
1. Use distilled water, not drinking or tap water. 2. Check the grounding of the engine to chassis and chassis to battery. 3. Add some Royal Purple - Purple Ice to the distilled water. 4. You can also have the plate anodized. |
10-23-2015, 04:56 PM | #3 |
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Re: corrosion around aluminum motor plate coolant holes
Back in my flathead days, anti-freeze was the answer.
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10-23-2015, 05:08 PM | #4 |
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Re: corrosion around aluminum motor plate coolant holes
Adding a zinc anode in a radiator bung used to be SOP when aluminum cooling system components were used in a cast iron engine environment. Adequate engine grounding is a must. As long as the water is potable (clean tap water quality) and the ph is around 7.0 we never found it necessary to use distilled water to prevent electrolysis.
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10-24-2015, 10:10 AM | #5 |
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Re: corrosion around aluminum motor plate coolant holes
I see it occasionally on cars in the shop. Usually can be traced to no or inadequate engine grounding. the motor plate should have a ground also.
A little cooling system conditioner dosent hurt either , helps with the Ph level.
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Tom Goldman 1500 SG , 1506 STK |
10-25-2015, 12:32 PM | #6 |
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Re: corrosion around aluminum motor plate coolant holes
Hi Guys,
Just my 2 cents.................. Zinc plates have been welded to the hulls of ships to prevent damage to the steel hull and brass screws by galvanic reaction..... The more active metal is sacrificed to protect the less active..... Zinc is a less active metal and unable to protect aluminum.... To prevent galvanic damage to aluminum a magnesium anode should be used.... For additional info I will post a link speaks to galvanic action... http://www.performancemetals.com/anodes/AnodeFAQs.shtml Bob
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Bob Mulry 7516 STK A & M Motorsports |
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