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Old 07-19-2017, 12:08 PM   #1
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Seafoam: good or bad idea?

Just came across a product called Seafoam to clean old engines. I read good and bad reviews about it (more good than bad I have to say). Not really considering putting that stuff in my engine since it runs great but I'm curious to see if others have tried it.

This is the stuff.
https://seafoamsales.com/
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Old 07-19-2017, 12:16 PM   #2
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Pretty well regarded with the car guys....
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Old 07-19-2017, 12:31 PM   #3
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A lot of guys swear by it to keep injectors clean. I use it annually.
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Old 07-19-2017, 12:58 PM   #4
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I used it on a 1971 Ford 351 Cleveland and a 1995 200 HP Johnson Ocean Runner and was rewarded with dramatic increases in performance and overall engine running. Be prepared for a lot of smoke (from the burning carbon) the first time you use it to de-carbonize an engine.
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Old 07-19-2017, 01:34 PM   #5
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Seafoam was a great help in freeing a 12V fuel pump .

To decarbonize an engine an old style Flit (bug spray ) filled with water is excellent.

With the engine warm , use a shim to get the engine running at about 2000RPM

Spray water into the intake till the engine stumbles as it runs.

A piece of news paper under the tail pipe will show the carbon chunks broken loose.

15 min is enough time to clear out a lot of gunk, and stop the running on after the key is off.
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Old 07-19-2017, 02:13 PM   #6
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Seafoan has been on the market since the 50's .. then under another name .. Risoline. Extremely high detergent. Formulated to break down carbon I think.

When I was a young man I'd get outboards free that were stuck/frozen. Using Risoline in both ends I usually got them running fine. May have unstuck the rings but I'm not sure.

It's hard to get the Seafoam to the edge of the piston/cylinder wall interface on diesels as the piston crown is usually very dished and vertical. V type or slant type engines are best for getting the Seafoam to the rings. Of course if an engine isn't stuck cranking it a few seconds should effectively wet the cyl walls.

I think after using it in a way that it would or could get into the lube oil I'd change oil afterwards ... especially at high concentrations. Rubber seals may not like it ... I don't know. But carbon is an abrsaive and after using Seafoam one should get stray carbon away from moving parts.
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Old 07-19-2017, 02:46 PM   #7
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Guys running the rotary engines in Rx-7s uses to swear by it. But then rotorheads are a bit of an odd group. I used to have a squeeze bottle of motor oil that I would use to add a few ounces to the gas tank at every fill up. This was in addition to the oil that would be injected into the rotor from the crankcase while the engine was running.

I think this is why they occasionally would run Seafoam through the engine then immediately change the oil. I was never brave enough to try it.
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Old 07-19-2017, 03:16 PM   #8
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I use a similar product distributed by Mercury marine.

Powertune.
It comes in a spray can and is great for cleaning up carbon buildup, or carburetors or even spot removal when nothing else works.
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Old 07-19-2017, 04:02 PM   #9
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Seafoam is also a fuel stabilizer, works great on my two stroke 2 HP Yamaha outboard and if you are parking your vechiles for a few weeks/months.
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Old 07-19-2017, 04:13 PM   #10
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Us it for my outboard engine and my old 1,000W Yamaha ,,1985, generator. Made a noticeable difference especially on the highly intermittently used gen.

Not in my boat engine though.
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Old 07-20-2017, 06:57 AM   #11
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Quote:
Originally Posted by C lectric View Post
Us it for my outboard engine and my old 1,000W Yamaha ,,1985, generator. Made a noticeable difference especially on the highly intermittently used gen.

Not in my boat engine though.

Why not?
Did any of you ever use it on their diesel engine?
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Old 07-20-2017, 07:12 AM   #12
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I have. It did make a difference.
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Old 07-20-2017, 08:01 AM   #13
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I have. It did make a difference.
Do you mind sharing exactly how you used it and what difference did it make. Were you trying to fix a specific problem? Thanks.
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Old 07-20-2017, 10:20 AM   #14
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Do you mind sharing exactly how you used it and what difference did it make. Were you trying to fix a specific problem? Thanks.
And also what kind of engine you have.
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Old 07-20-2017, 09:34 PM   #15
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I've used it to decarbon outboards and mower engines. Worked great. had a low compression cylinder that came back on a 40 Evinrude. I've considered using it in the filters of my Lehman 120 at next change per the Seafoam suggestions.
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Old 07-20-2017, 11:52 PM   #16
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I'm leery of many of these additives. I have posted a test by Diesel Place several times and some of these highly touted additives actually can do more damage than good.
Sea foam was recommended to me for my outboard by someone I trusted, the local O./B mechanic.
If it screwed up up I could afford the repair/replacement bill.

If it screwed up my main boat engine I would be out of boating.

That's why.
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Old 07-21-2017, 12:56 AM   #17
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Seafoam: https://seafoamsales.com/

And

Berrymans B-12 Chemtool: https://www.berrymanproducts.com/pro...ector-cleaner/

IMO - Both of the above products are great for keeping internal portions of fuel lines as well as other internal engine parts clean.

The below product is great for keeping fuel in tank clean, water free and sludge free with no separation.

Soltran: Soltron - The enzyme fuel treatment for diesel and petrol engines

Each are quite affordable and can be picked up in NAPA auto stores. I've been using them for many years having really good results!
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Old 07-21-2017, 04:29 AM   #18
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I carry a gallon in the boat at all times, I treat every few tanks just because. I have used the regular sea foam fuel additive in gasoline, diesel and in crankcase oil. I also used the spray can you spray into the intake to clean up the intake, cylinders and valves. I swear by it. I first used it to treat my tanks and clean up my fuel system in the boat, noticed immediate improvement in idle quality and cruise power. That was years ago. I use it in my lawnmower and other small engines to clean up deposits from the E85 fuel if left sitting for too long, haven't had to tear apart a carb in quite a while. Recently bought a car that had been sitting stored for 30+ years, it ran but the oil Control rings appeared stuck and lifters sticking (ticking) Added sea foam to fresh clean crankcase oil and ran for a hundred miles or so. Oil came out black as night, car now runs like new. Also fog carb with the aerosol on all engines. I swear by it.
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Old 07-21-2017, 04:49 AM   #19
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I prefer Marvel Mystery Oil
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Old 07-21-2017, 05:43 AM   #20
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Last I checked Sea Foam is :
- 50% pale oil
- 35% naptha
- 15% IPA
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