MM1

I run all the engines I build at the shop on a test stand and its really easy for water to climb back up 8 -9 inches of pipe. You can see the water at idle going up the pipes while its running. Make the pipes dry for aslo as posible!

nocigarette

go dry....

Griff

Weld in a small damn into the risers??? Doesn't sound like you have a lot of reversion and this might work. Also, whats your idle rpm??? If you can bump it up 100rpms, it might be enough to get rid of it also.

Rookie

Is that stick that aggressive for reversion??
just curious

Thunderstruck

Sure an exhaust header isn't leaking on the milk motor?? If it was reversion both motors would have the milk. Are both cams the same? Did you degree the cams? Although it doesn't take much water to kill a cylinder the only times I have had the problem is with leaky exhausts. New or not the milk motor exhausts need to be checked.

Dry pipes are loud.

GNJ

Thunderstruck: Yes - Same cams in both motors and yes they were each degreed. The only differnce is one motor is bored 0.030 over and the other is standard 502 bore(milk motor. I don't know if that would have any bearing but I thiought I would mention it in case.

Griff: Although I could probably get the idle up more and work around it, the wife drives it as well and doesn't know enough about this kind of thing to keep it from becoming a bigger problem. On my Fountain 32' fever, the exhaust pipes go below the swim platform which are submerged off plane and may also be a contributing factor.

I pulled the risors off today and the manifolds had salt residue inside all of them, so definitely reversion.

OK, if I go with a dry pipe, the manifold and risor will be cooled with water and then dumped overboard, but will the rubber exhaust hose that connects it to the transom pipe survive?

Anybody have experience with trying this?

BenPerfected

What if you modified your current tailpipes so the the water entered right where the tail pipe and rubber hose connect? How much change is that from your current set up?

GNJ

BenPerfected: There is only about 4" more that could be added before the transom pipe to dump water into the exhaust stream. The transom pipe has an internal butterfly valve to help control water from being pushed back up the pipe.