Originally Posted by sprink58 (Post 4027918)

I have been boating in South Florida for 35 years. One trick I learned from an old "Salt" was to inject Dawn Dish Washing liquid into the fresh water flush regimen and let it sit in the block. I have never had a corrosion failure of a block or exhaust manifold in practicing this habit. There is something in Dawn that neutralizes the effect of NACL on the FE...it's as if it coats the surface of the block and prevents the salt from reacting with the iron.

I remember my Chemistry I recall that most household dish washing detergent has Soda Ash in it which is higher on the PH scale than Salts such as Sodium Chloride and the Dawn simply neutralizes the effect of the salt because of this.

Anyone else ever hear of this?

Originally Posted by PremierPOWER (Post 4026831)

If you have the anti freeze tank next to the engine (pink fluid), then they are closed cooling and like you said, water only goes through the exhausts. However, if you have CMI headers and they crack like all 5 of ours did then the salt water will get into the engines and ruin them.

Originally Posted by sprink58 (Post 4027918)

I have been boating in South Florida for 35 years. One trick I learned from an old "Salt" was to inject Dawn Dish Washing liquid into the fresh water flush regimen and let it sit in the block. I have never had a corrosion failure of a block or exhaust manifold in practicing this habit. There is something in Dawn that neutralizes the effect of NACL on the FE...it's as if it coats the surface of the block and prevents the salt from reacting with the iron.

I remember my Chemistry I recall that most household dish washing detergent has Soda Ash in it which is higher on the PH scale than Salts such as Sodium Chloride and the Dawn simply neutralizes the effect of the salt because of this.

Anyone else ever hear of this?