Cold Water Exhaust?

[Kalani 938]

I took my boat out today to test drive the new 4 blade prop I just installed and I noticed something that I've never seen before. While the boat was idleing there was a white colored mist coming out from behind my boat. Now I know this is the exhaust, but is this happening just b/c the water is still really cold? It didn't do it last summer when I ran it. Have any of you witnessed this? I know this may be a stupid question, but I'm a pretty new boat owner and just want to make sure.

 

[Kalani 938]

Re: Cold Water Exhaust?

Anyone?

 

[H8tank]

Re: Cold Water Exhaust?

I wouldn't worry about it, many older boats will 'smoke white', and if it was cold, then sure.

 

[a70eliminator]

Re: Cold Water Exhaust?

If it was cold enough to see your breath, then yes you'll see condensing of the exhaust vapors, water is a byproduct of combustion.

 

[Bondo]

Re: Cold Water Exhaust?

Ayuh,... Was it burning off Fogging oil,..?? First run of the season,..??

 

[EAVES]

Re: Cold Water Exhaust?

I wouldnt worry about the white smoke ,steam or whatever you call it LOL its normal

 

[Kalani 938]

Re: Cold Water Exhaust?

Thanks guys! Yes it was the first run of the season.

 

[Silvertip]

Re: Cold Water Exhaust?

While the ports at the back of the engine can be considered exhaust, they are technically exhaust "relief" ports. The exhust for an outboard generally exits through the hub of the prop. However when idling, there is a considerable amount of back pressure on the hub so some of the exhaust exits at those relief ports. Depending on the temperature, you may notice a very fine water mist and some vapor discharge. That is perfectly normal.

 

[Kalani 938]

Re: Cold Water Exhaust?

That's a relief to know, I was kinda stressin about it. My motor is actually a 4.3L Mercruiser I/O engine.