70HP Evinrude How long on Muffs?

[cougar15]

I have read a lot of posts on the forum about using muffs or a barrel to run an outboard out of the water for cleaning or testing but one thing I could not find in any of the posts was how long you can safely run an outboard this way? <br /><br />I want to clean my carbs using the seafoam method described in the sticky but I don't have a lake that I could do this at so I thinking about trying to do it in the driveway. What I don't know is, if it is safe to run the motor for 15-20 min at idle on muffs or a barrel. I have a 1977 70hp Evinrude.

 

[wilde1j]

Re: 70HP Evinrude How long on Muffs?

No specific limit as long as the motor doesn't overheat.

 

[Walker]

Re: 70HP Evinrude How long on Muffs?

15 to 20 minutes in a barrel is risky. The water heats up and thus doesn't cool the engine like fresh water that the engine was designed to run in.

 

[phatmanmike]

Re: 70HP Evinrude How long on Muffs?

hey walker, what birdy told you that? <br /><br />on my 200hp merc, i can hold my hand directly under the prop in the exhaust water and hold it there....<br /><br />but.... yes, as long as your motor has water from the muffs, you can run it for 17 years, it doesnt care.<br /><br />but ive seen guys go inside to get a beer and come out and the muffs had fallen off, or the hose kinked and now they have a 70hp lawn ornament.

 

[Walker]

Re: 70HP Evinrude How long on Muffs?

Its simple. 85 degree water can absorb more heat than 145 degree water. <br />Run your motor for 15 or 20 minutes in a barrel of 85 degree water and you will end up with a barrel of 145 degree water and an overheating engine.