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-   -   Precautions to prevent water ingestion or reversion after Silent Thunder Mods? (https://www.offshoreonly.com/forums/formula/330826-precautions-prevent-water-ingestion-reversion-after-silent-thunder-mods.html)

97FASTech 09-18-2015 09:52 AM

2 Attachment(s)
My engine builder said I had reversion due to the water backing up the risers on pull out. Since then I have changed from low risers to the newer high risers. I leave the boat running until all winched up and secure. then shut it off, and pull out as soon as possible.

Splitdecision271 09-18-2015 10:50 AM

Is your thought process of leaving it running until winched and secure because the pressure from the exhaust will force any ingestion of water out instead of letting it in?

3pointstar 09-18-2015 11:44 AM


Originally Posted by splitdecision271 (Post 4356088)
you scare me!!!!

booooo!!!!

97FASTech 09-18-2015 11:55 AM


Originally Posted by Splitdecision271 (Post 4356105)
Is your thought process of leaving it running until winched and secure because the pressure from the exhaust will force any ingestion of water out instead of letting it in?

Yes. Good or bad?

Splitdecision271 09-18-2015 05:00 PM

If it works for you then good. I personally don't want to run the risk of sucking water back in should I have an exhaust valve chipped or not seating properly and the exhaust submerged. Everyone is going to have their ways and opinions for doing things. No one way is the right way, it comes down to whatever works for you is the right way.

Br1dgemann 09-18-2015 08:02 PM

97FASTech - sweet engine bay! I like those risers. What brand are they?

As far as running until winched up and secure - that is what I do when retrieving my Donzi - usually in gear to keep the bow against the roller. But I think those thru-hulls are a bit higher above the water than the Formula, so I get a real uneasy feeling when I load the 292.

97FASTech 09-19-2015 10:06 AM


Originally Posted by Br1dgemann (Post 4356277)
97FASTech - sweet engine bay! I like those risers. What brand are they?

They are stock Gil "High" Risers. These were the fix to reversion on a lot Merc motors that had the "Low" (pic on right)risers.

97FASTech 09-19-2015 10:07 AM


Originally Posted by Splitdecision271 (Post 4356230)
If it works for you then good. I personally don't want to run the risk of sucking water back in should I have an exhaust valve chipped or not seating properly and the exhaust submerged. Everyone is going to have their ways and opinions for doing things. No one way is the right way, it comes down to whatever works for you is the right way.

I see your point!!

Splitdecision271 09-21-2015 07:45 AM

I chipped an exhaust valve last season on the starboard motor. Mechanic said I showed some signs of water being pulled back in but nothing that was of much concern to him. Cylinder walls and piston were spotless, so just needed to rebuild the heads. Ever since then it's just something there in the back of my mind.

The ramp I use is also in the center of the marina, so as a courtesy to my fellow mariners I usually hit the silent choice so not to be a nuisance or interfere with casual conversation to those with slips next to the ramp. I had a gentlemen, in a slip next to the ramp, this weekend tell me that I should make a video of how to launch and retrieve a boat and somehow have it play in repeat at the ramp for others to watch.

Br1dgemann 09-21-2015 08:52 AM


Originally Posted by Splitdecision271 (Post 4356962)
I chipped an exhaust valve last season on the starboard motor. Mechanic said I showed some signs of water being pulled back in but nothing that was of much concern to him. Cylinder walls and piston were spotless, so just needed to rebuild the heads. Ever since then it's just something there in the back of my mind.

The ramp I use is also in the center of the marina, so as a courtesy to my fellow mariners I usually hit the silent choice so not to be a nuisance or interfere with casual conversation to those with slips next to the ramp. I had a gentlemen, in a slip next to the ramp, this weekend tell me that I should make a video of how to launch and retrieve a boat and somehow have it play in repeat at the ramp for others to watch.

Nice! I have had people comment on my ability to efficiently launch and retrieve any of my vessels alone. Usually people who think they are being helpful slow me down or hinder the process.

I hydro locked a motor once..... several push rods looked like S-curves. It was wounded bad..... hence my concerns with water ingestion...


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