Fog or not to fog??? on a ZR6

[wakecrashin]

May sound like a stupid question but many people with "summer" cars dont fog their engines in their cars over the winter so why would this be any different? Also isnt there a chance for putting too much fog oil in the engine as well. Wouldnt a good idea to be to run the boat, cut off the fuel line off, what till it dies and then your done?

Please bear in mind a Im def not a mechanic.

[wakecrashin]

RE: Fog or not to fog??? on a ZR6

anyone????

[WakeSlayer]

RE: Fog or not to fog??? on a ZR6

I do not fog mine....

[rocco]

Fog or not to fog

Me either..Never any problems.

[MikeC]

RE: Fog or not to fog

Fogging adds a protective film on the inside of the intake sysem and cylinder walls. The majority of cars are not stored over the winter and those that are generally are stored inside so fogging for storage of cars has really never caught on (but if you look at how to store an auto engine for a long period of time most manuals recommend that you pour oil into the cylinders to reduce the chance of rust.) Boats on the other hand are usually stored in damp enviornments and in extreme temperatures so the fogging is done to reduce rust on the inside of the engine.

If you don't fog you won't notice the difference in one or two years but over time the cylinder walls will be scored with tiny scratches that will eventually take their toll on performance.

So my question is; for five dollars and five minutes (20 if you take the spark plugs out and spray it directly into the cylinders) why wouldn't you fog an engine? Seems like cheap preventive maintenance to me.

[wakecrashin]

RE: Fog or not to fog

"Fogging adds a protective film on the inside of the intake sysem and cylinder walls"

Well if you pull the plugs how will it get in the intake? Arent the cylinder walls lubricated with oil in during normal operation?

Also if it was that important dont you think PCM would make it very clear on there fogging precedure?

???

[MikeC]

RE: Fog or not to fog

You spray the fogging oil into the intake while the engine is running, this pulls the oil through the intake. After shutting off the motor you remove the spark plugs and spray the oil into each cylinder, then turn the crankshaft with a wrench to allow the pistons to spread the oil over the cylinder walls.

The reason for using fogging oil is that it will stick to the cylinder walls and form a protective coating. Engine oil will eventually flow off the metal if the engine isn't run on a regular basis.

As far as the spraying the oil into the intake, I'm afraid that's old school - but I still do it and there are differing thoughts on that. But this is direct from the PCM manual (page 58 of the 2006 manual) on Out Of Season Storage:

4. Restart the engine and allow it to idle for 5 minutes.
WARNING
Operate the bilge blower and be sure no fuel vapors are present when treating the engine. Be sure the engine compartment is well-ventilated to prevent a potential fire hazard.

5. Turn off the ignition and remove the spark plugs. Use an aerosol-type fogging solution and spray a sufficient amount into each cylinder. (Spray 5 seconds per cylinder, minimum.) Turn the crankshaft several revolutions by hand to spread the oil evenly throughout the cylinders.
NOTE: If you are using a bulk type preservative oil, pour approximately one (1) teaspoon full of oil into each
cylinder, through the spark plug hole, then turn the crankshaft several revolutions by hand to spread the oil
evenly throughout the cylinders.
6. Install the spark plugs and connect the spark plug wires.
NOTE: It will be necessary to remove the spark plugs and spin the engine to eliminate excess oil prior to
restarting after the storage period.

[TRBenj]

Re: RE: Fog or not to fog

As far as the spraying the oil into the intake, I'm afraid that's old school - but I still do it and there are differing thoughts on that.

Its "old school" because its a good thing to do on carb'd and TBI motors but NOT Multiport EFI. The GT40, Excal, and ZR6 are all Multiport motors, which means they have dry intake manifolds. On these motors, you should only be fogging the cylinder directly (through the spark plug hole).

[Quinner]

RE: Re: RE: Fog or not to fog

As it mentions turning the motor over by hand, would there be any harm in pulling your lanyard and turning the motor over using the starter to spread the oil? I do each cylinder 1 at a time replacing the plug and wire then moving on to the next one, could hydro-lock be an issue if using the starter since the spark plugs will be in?

[MikeC]

RE: Re: RE: Fog or not to fog

TRBenj..thanks for the clarification...you're absolutley right about not fogging the intake of fuel injected engines.

Quinner there are two problems with doing one cylinder at a time and using the starter to turn over the engine

First; when you turn over your engine with the starter, fuel will enter the cylinders, thereby diluting the fogging oil.

Second; Hydro-lock could be a problem depending on how much oil is in the cylinder and wether it's on the compression or exhaust stroke And I can guarantee that through this whole process you'll only have one or two cylinders on the exhaust stroke, and if you turn it over enough you'll force all of the oil out of the cylinders.

It's really easy to turn the engine over with all of the spark plugs removed It's a little more difficult with a v-drive just because we're missing the extra joint in our arm that's needed to work on the front (or is it the back) of the v-drive engine.

[Red57Bird]

Probably a dumb question, but how do you turn over the engine by hand?

[TRBenj]

Probably a dumb question, but how do you turn over the engine by hand?

With a socket and a breaker bar on the crank bolt. Fords are 15/16".

[ski36short]

Another dumb question... why not fog through the intake on MPI motors? The injectors are still in the manifold so they're not entirely dry. I've heard of MAP sensor contamination concerns but I don't buy it.

[M3Fan]

Another dumb question... why not fog through the intake on MPI motors? The injectors are still in the manifold so they're not entirely dry. I've heard of MAP sensor contamination concerns but I don't buy it.

For the record, Indmar (unless they very recently changed this) has always recommended fogging through the intake even for their MPI motors, FWIW