Winterize

[Tige'20i]

So why does the Marine Power Engine Owners Manual say that fogging isn't required on a fuel injected motor?

[chpthril]

So why does the Marine Power Engine Owners Manual say that fogging isn't required on a fuel injected motor?

That's a very good question since fogging has nothing to do with the fuel delivery type, It's about preventing rust on the valves, pistons, cylinders, etc, caused by moisture.

[anhaney]

Here is the issue on Fuel injection

So why does the Marine Power Engine Owners Manual say that fogging isn't required on a fuel injected motor?

If your engine is a throttle body or carburetor engine Fog it. If your engine is a Multi Port Injection engine do not fog it.

If you fog multi port engines the injectors will gum up from the fogging oil over the winter. thus causing you to have to do injector work at the start of next season.

[dogbert]

That's why I never fog mine

[chpthril]

If your engine is a throttle body or carburetor engine Fog it. If your engine is a Multi Port Injection engine do not fog it.

If you fog multi port engines the injectors will gum up from the fogging oil over the winter. thus causing you to have to do injector work at the start of next season.

Anhaney,

I don't disagree with your info very often, but this I would have to. If fogging oil caused any gumming issues, we would see this in valves not seating and causing loss of compression, seized piston rings causing oil blow-by and consumption and loss of compression and mis-firing/fouled plug(s) due to build up on the electrodes.

Also, gumming of the injector pintle valves cone, on the discharge side, is very rare due to the spray of fuel keeping it clear/clean. If a thin layer of fogging oil where to dry on the injector cone, it would be washed off on the first start up by the fuel and it's additives.

Last, the injectors a placed at an angle. Not quit parallel with the intake runner, but by no means perpendicular to the runner and slightly recessed. Vacuum created by the engine will pull the air/fogging oil past the injector tip. Very little swirling going on in the intake, so any fogging oil left in the intake upon shut down would settle in the floor of the intake runner.

[spharis]

fog???????? I thought you said FLOG!

[anhaney]

Anhaney,

I don't disagree with your info very often, but this I would have to. If fogging oil caused any gumming issues, we would see this in valves not seating and causing loss of compression, seized piston rings causing oil blow-by and consumption and loss of compression and mis-firing/fouled plug(s) due to build up on the electrodes.

Also, gumming of the injector pintle valves cone, on the discharge side, is very rare due to the spray of fuel keeping it clear/clean. If a thin layer of fogging oil where to dry on the injector cone, it would be washed off on the first start up by the fuel and it's additives.

Last, the injectors a placed at an angle. Not quit parallel with the intake runner, but by no means perpendicular to the runner and slightly recessed. Vacuum created by the engine will pull the air/fogging oil past the injector tip. Very little swirling going on in the intake, so any fogging oil left in the intake upon shut down would settle in the floor of the intake runner.

True makes sense. I can go with you on that. I was just being the devils advocate and presenting a possible reason for why some engine marinizers say to do and some don't. I think more important than fogging is to put a good high quality oil with a stabilizer in the engine to keep some sort of lubrication in the top end of the engine while sitting.

Synthetic oil is not a good oil to keep in the engine for the winter. The stuff is so slick that it tends to drain of the parts while sitting for long periods of time and that is the bigger issue than fogging in my opinion. Here in CA I just start my boat up through the winter so I don't really worry about winterizing it. Although this year I may.

[Tige'20i]

If you fog multi port engines the injectors will gum up from the fogging oil over the winter. thus causing you to have to do injector work at the start of next season.

What about spring fogging oil in the cyclinder of a muli port thru sprark plug holes?

[anhaney]

What about spring fogging oil in the cyclinder of a muli port thru sprark plug holes?

That may be okay. It all depends on the placement of the injector. If you are fogging correctly you will be spraying fogging oil while cranking the engine. So the slashing air in the cyl. may push the oil up to the injector. I think it is more personal preference and location to where you live. In Bakersfield CA it is very dry and we do not have a lot of moisture in the air so I do not worry to much about fogging. And now it is getting so cold and work is moving into 4th quarter so I may put the boat away for the year.