Answer straight from PCM regarding fogging of engines...

[JUST-IN-TIME]

ok

with it on the fake a lake, you not getting full water pressure like on the lake

remember, all that lake water wants to come up the water inlet screen, the water pressure is intense keeping that impeller full of water

as for FREE revving any motor, its just bad without a load

look at all the hot rod builders, when they dyno or break in a motor there is a load on it

you can twist cranks and throw rods without a load

only reason you do not put the boat in gear out of water is that you will burn the strut bearing up quickly!!

some guys spray soapy water on it to cool it down, i do not recommend this but have done it to check the run-out of a drive shaft


10 seconds without enough water on any impeller with score the housingi have seen burnt housing from using a fake a lake

only reason you need a fake a lake is that you use in salt or the lake has a ton of minerals in it

[IDBoating]

with it on the fake a lake, you not getting full water pressure like on the lake

Hmmm... the only two things moving water into the raw water intake are 1) the raw water filter, and 2) forward motion of the hull if your engine water intake is the "scoop" style.

Forward motion of the hull isn't going to generate much pressure unless you're moving reasonably fast. Sitting still, or at minimal wake speeds, I'd venture that very little water pressure is developed.

I've considered hooking my garden hose directly into the raw water filter and eliminating the fake-a-lake. At that point the raw water pump would be seeing 60 PSI water. I'll bet that's a LOT more pressure than the hull develops into the scoop. Has anyone ever researched that?

In any case, the system relies primarily on the suction developed by the impeller in the raw water pump. And that is dependant upon engine RPM. When I used a fake-a-lake, I had water absolutely pouring out of the exhausts so I know the impeller was getting plenty of water.

only reason you need a fake a lake is that you use in salt or the lake has a ton of minerals in it

Or if you want to winterize your engine away from the lake. {grin} I think it's a good idea to winterize on the trailer in case something goes wrong and you need to take the boat to the shop.

How do you prep your customer's engines for long-term storage? Do you drop the boat in the lake, or use a hose of some sort?

[ajholt7]

if you do fogg you need to keep spraying it until the motor dies and keep spraying 10 seconds after that

Won't happen. You can spray an entire can of fogging oil in an EFI engine and it won't die.

[IDBoating]

Won't happen. You can spray an entire can of fogging oil in an EFI engine and it won't die.

And you can only do THAT if you're spraying it into the air intake or induction manifold, which I've never seen any manufacturer recommend.

[JUST-IN-TIME]

oh it will die
done it more than once
the spark plugs foul

you almost go thru the whole can!!!
you need good fogging oil not walmart stuff

[ajholt7]

And you can only do THAT if you're spraying it into the air intake or induction manifold, which I've never seen any manufacturer recommend.

I recommend it. It is quick, easy, and never caused any problems. I'll let you know if it ever does, but I don't think it ever will.

[TRD]

I spray about 1/2 can of fog oil in mine, I don't usually spray until the engine dies, just until it starts to smoke or fog out the back pipes. Are you saying that I am not putting enough fog oil in to coat the cylinder walls?

This is so confusing to the average person, with all the motor heads in the shop everyone has different ideas and they don't know squat about boats.

[chpthril]

Man, if all you pansies would just nut up and ride year round, this fogging crap would be a moot point

[IDBoating]

Man, if all you pansies would just nut up and ride year round, this fogging crap would be a moot point

My 24Ve would need to convert to an ice boat to do that {grin}. Here's what my lake looks like in the winter:





I guess I can call Tige and see how much the 24Ve conversion kit costs to seasonally transform it to this:

[embo]

Man, if all you pansies would just nut up and ride year round, this fogging crap would be a moot point

haha...I wish I could. Not enough "nutting up" around my area to make it worth it. Waiting for the day though.

[TRD]

Man, if all you pansies would just nut up and ride year round, this fogging crap would be a moot point

When do you want to go? next wkend..(Friday would be good).. Your are getting in 1st. I have a wetsuit, I still ready to go. I not going to Norman though, to cold for me.

[skyski_tige]

My 24Ve would need to convert to an ice boat to do that {grin}. Here's what my lake looks like in the winter:

I guess I can call Tige and see how much the 24Ve conversion kit costs to seasonally transform it to this:

They have tried the conversion kit before and did not work...

[IDBoating]

Wow... how'd they do that photo?

[boatwakes]

That guy had a freak snowstorm a few years back and if I remember correctly, the engine block cracked. But awesome photo!
Back to water pressure issue. I have mechanical water pressure gauges mounted and in use on all our boats. Just for giggles, I hooked one up to the inlet side and ran around for a bit. Max water pressure produced from any mercruiser engine is 18psi immediately after the pump, Crusader 454's was 15psi measured same spot and marine power was 15psi too (all at 3000rpm). Measured on the pickup side, none read any pressure but when a vaccuum gauge was hooked up, guess what? Those water pumps will suck the chrome off a trailer ball: 11" vaccuum from a 1.25" hose!
Just a reference thought. These same raw water pumps are used on all merc bravo and volvo drives and they must suck huge amounts of water fairly long distances compared to what they do on our Tige's. Don't worry about using a fake-a-lake unless you have a restricted FLOW going to the unit. Larger hose makes for more flow, you do not really want larger pressure in this case. 3/4" hose and 10psi will flow about a gallon/second and thats fine. Where as 3/64" hose and 1700psi will flow 1.4gal/minute(pressure washer) and thats not fine. Good luck, but I'm with CHP, year round that crap and fuggetaboutit!

[SPBFAN]

Wow a good topic guys. I take my wave runner premix every year at the end of the season, pump it out, run it through my cars or trucks and have never had an issue. But they don't just sit after doing that either. I start my boat every month when it is just sitting during the winter to avoid needing to winterize it to the extreams you guys in cold weather need to do. I tea spoon of oil in each cyl will not hurt the cats though.