Muffs v. trash can full of water

[TilliamWe]

Re: Muffs v. trash can full of water

Ok, Mark, that's great the gauge doesn't lie. But as long as the muffs provide the amount of water needed, your hyper-accurate gauge is irrelevent. And that has been my experience when using muffs.

You are correct about the water blasting the muffs off the sides of the drive, but again, you don't need that much volume or pressure. Plus there are muffs that have a piece that sticks through the intake holes, to lock them in place. "Viola", another "problem" solved.

 

[Mark42]

Re: Muffs v. trash can full of water

Ok, Mark, that's great the gauge doesn't lie. But as long as the muffs provide the amount of water needed, your hyper-accurate gauge is irrelevent. And that has been my experience when using muffs.

You are correct about the water blasting the muffs off the sides of the drive, but again, you don't need that much volume or pressure. Plus there are muffs that have a piece that sticks through the intake holes, to lock them in place. "Viola", another "problem" solved.

Hey, Why don't you get one of these really cool "hyper-accurate" and " irrelevent" gauges and see for yourself. Then you will have some concrete facts to to share when you tell members how the tank registers higher pressure than a hose.

 

[TilliamWe]

Re: Muffs v. trash can full of water

Mark, you are missing the obvious point. I believe you that the pressure is higher, I just don't care, and it doesn't matter. As long as the motor and the exhaust manifolds get the required cooling water, then the pressure difference is irrelevent.
Roll your eyes all you want, muffs work great when used properly. And with just a little effort and care, they are very simple to use.

 

[Apollo75]

Re: Muffs v. trash can full of water

Either way seems to work well.

I was thinking about installing a pressure gauge somewhere so I know when it is about time to replace my impeller.

OFM

 

[Mark42]

Re: Muffs v. trash can full of water

Mark, you are missing the obvious point. I believe you that the pressure is higher, I just don't care, and it doesn't matter. As long as the motor and the exhaust manifolds get the required cooling water, then the pressure difference is irrelevent.
Roll your eyes all you want, muffs work great when used properly. And with just a little effort and care, they are very simple to use.

I use muffs too. In fact, most of the time muffs are fine. I prefer the tank when I have to work on the motor, rev it up or let it run a while. Surprisingly, it takes quite a while for a motor to heat up 50 gallons of cold water, so all thats needed is to let the hose trickle into the can to make out what gets sprayed out idle exhaust ports.

When i just want to fire up the motor before hooking up the trailer, its muffs all the way.

The original post was about replicating operation conditions. The tank does that better than muffs. I have also run outboards in plastic 50 gallon garbage cans, and engaged the prop at low rpm's. Its a little messy, but works fine. Also, when reving up the motor, a tanked outboard will build water pressure, where a muff fed motor gets water starved because pressure does not rise much at all.

 

[electricjohn]

Re: Muffs v. trash can full of water

Although the muffs should be self regulating pressure wise (by leaking). I have blown a water pump seal using the muffs. Evidently garden hose pressure was a little too much for the seal and the muffs did not leak enough to lower the pressure. I now turn the water on just prior to starting and pull the muffs off the lower unit immedately upon shutting the motor off. Once the motor starts, I regulate the garden hose flow so that just a tiny bit of water leaks from the muffs. I launch in salt water, so I flush after every use. So there have been 1000's of launches since 1963.

 

[kg5388]

Re: Muffs v. trash can full of water

my Buddy ran his motor for years and he never had a prop hub problem He only ran his boat at the lake and the only maint he did was run the carbs dry at the end of the year and change lower unit gear oil and adds seafoam
10 year mercury and still has paint on the spark plugs from the factory

I do a full service and compression check and winterize my ouboard at the end of the year.
I run mine on the muffs the night before I go to the lake for a few min and had 1 prop hub fail in 14 years

other buddy has the same maint as I do but done by a boat mechanic but he runs his every week for 30min to an hour on the muffs and has prop hub problems almost every year

I think the exhaust heat can build up and damage the lower unit seals by running to long on just the muffs
quick test run on muffs ok but for anything longer use a tub or garbage can

 

[airdvr1227]

Re: Muffs v. trash can full of water

hotter on muffs on the trailer, that is common and normal

from this thread http://forums.iboats.com/showthread.php?t=350797

If it's common and normal muffs aren't as good as immersion of the drive. I've noticed this on my rig. Gets hotter on muffs.

 

[TilliamWe]

Re: Muffs v. trash can full of water

hotter on muffs on the trailer, that is common and normal

from this thread http://forums.iboats.com/showthread.php?t=350797

If it's common and normal muffs aren't as good as immersion of the drive. I've noticed this on my rig. Gets hotter on muffs.

Well, again, that's opposite of my experience. I have to turn my water WAY WAY down to get it to heat up on the muffs. So you either have bad muffs, bad water pressure, or an impeller issue. Mark is right, a trash can would more replicate in the water conditions, but it should be unecessary. Plus if you somehow managed to catch all the HOT exhaust water in the trash can, pretty soon, al your cooling water would be very hot.

Bubba, location of the impeller pump doesn't really matter. Even Bravos with engine driven pumps use muffs, and use them well. Volvo Pentas too.

 

[Apollo75]

Re: Muffs v. trash can full of water

I thought about it and decided to NIX the pressure gauge thing. My cooling system could be plugging up and the impeller pushing less water pressure and I would still see the same pressure.

I am waiting for the nano bots to come out and let them clean out the system and keep everything ship shape.


OFM