Is fogging really necessary?

[180shabah]

Re: Is fogging really necessary?

What are we trying to accomplish with premium????

There is no reason to run it.

 

[rbh]

Re: Is fogging really necessary?

What are we trying to accomplish with premium????

There is no reason to run it.

My general thought on running the premium fuel, is as a mix.
If you have older fuel that that your not to sure about, and it is going to be a pain in the butt to get rid of it/remove it, do a 1 to 1 mix so as to bring the octane level up.
This may not be the text book method, but it works.

 

[180shabah]

Re: Is fogging really necessary?

Backwards - the higher the octane, the more resistant to ignition. Old gas is already harder to burn. Stick with the regular your engine was designed for.

 

[QC]

Re: Is fogging really necessary?

I moved this to the I/O section as:

A) It's an I/O

B) We try to keep the boat section free of engine topics

Also, let's keep this OB free as that muddies up the fogging oil . . . Translation: Two cycles with oil in the cylinder on every stroke are a different animal fo sho . . .

 

[airdvr1227]

Re: Is fogging really necessary?

Backwards - the higher the octane, the more resistant to ignition. Old gas is already harder to burn. Stick with the regular your engine was designed for.

Is it harder to burn even if it's been treated before being put up?

 

[H20Rat]

Re: Is fogging really necessary?

only problem i've had with fogging is trying to stall the engine when fogging through the carb. the can just don't introduce enough to stall it. problem cured by filling up a cup with fogging oil and pouring it in. that'll get it to stall.

That would REALLY scare me! There is a very fine line in between killing an engine by inducing a non-flammable mixture, vs hydrolocking an engine. By spraying in an aerosol from a can, its nearly impossible to hydrolock, just not enough flow. Concentrating that aerosol and then dumping it in, extremely dangerous.

Yep, it might stop the engine.... And push a rod out the side of the block at the same time. When metal tries to compress liquid, metal loses, every time!

 

[captk]

Re: Is fogging really necessary?

Fogging not only coats the cyl walls with a thin film of oil it also treats the valve trane. Although not too common today in years past(like the 40s and 50s) Flat head engines, solid lifters etc. sticky valves and bent push rods in spring on unfogged engines was the norm. for my money its cheap insurance. Start on the old plugs run till no more smoke and put in new pulgs good spring time maintenance.

As far as stalling the engine, you can close the choke plate or if a merc trip the shift interrupter switch. Bill

 

[ziggy]

Re: Is fogging really necessary?

Concentrating that aerosol and then dumping it in, extremely dangerous.

not dumping it in. pouring it in. some smoke, more smoke, still more smoke till stall.
with the can, i've never been able to get mine to stall, and it don't smoke enough (imho) either.

of course i don't want to hydro lock it either. that's not the goal. real smokey till stall is.

good point though.

 

[180shabah]

Re: Is fogging really necessary?

...or shoot from 2 cans at the same time.

 

[liquidlew]

Re: Is fogging really necessary?

Is it harder to burn even if it's been treated before being put up?

Shouldn't be, I put the correct amount of STA-BIL in my tank after my last fall run, then fill the tank with reg. 87 octane to get it good and mixed up, and prep it for winter slumber. When I go to fire it up in May (which I just did last weekend), it always starts right up on the first click, which I find a little strange, since it don't start like that when I put it in the water! But I never notice any performance problems burning up that first tank after winter wakeup!

 

[HT32BSX115]

Re: Is fogging really necessary?

I'm finding my rig runs even more rough at idle than it did last season. Only thing that has changed as far as I can tell is the carb has now been saturated with fogging oil. Next week this carb comes off and a reman goes on. But I'm not so certain that this fall I want someone loading this one up with fogging oil. Hence the question.

well,

If your boat sits in a dry garage all winter then, NO. I don't think it needs fogging.

I had a 1966 Mark Twain with a 150 Mercruiser that my dad bought new. It NEVER was fogged once in it's 39 year life that I used it.....(I sold it in 2005)

I usually quit using my boat in SEPT and I use it again in late May or early June. I also have never used STABIL or any other type of snake oil in the gas.

I have never stored it with the tank full and in fact, I usually put it away with as little gas inside as possible......I just fill it up before I go to the lake for the first time of the season. I have never found any water in the tank and I've looked.


I keep my boat in a dry garage all winter.


Cheers,


Rick

 

[180shabah]

Re: Is fogging really necessary?

Stabil slows fuel degredation, but it doesn't stop it. When used as directed the, you should not be able to tell the difference from fresh fuel.

Premium is still a waste unless your are high compression, advanced ignition timing, etc.

 

[airdvr1227]

Re: Is fogging really necessary?

Interesting. I always thought the opposite about fuel.

 

[Mike Robinson]

Re: Is fogging really necessary?

Shouldn't be, I put the correct amount of STA-BIL in my tank after my last fall run, then fill the tank with reg. 87 octane to get it good and mixed up, and prep it for winter slumber....

It's also a good idea to run the motor after adding the fuel treatment so that it gets into the carb(s) too.

 

[liquidlew]

Re: Is fogging really necessary?

Yeah, I do run it after I stabilize the fuel, it's part of my Winter Slumber prep. I run it for 10-15 minutes and run Salt Terminator thru it also. I don't fog though cuz I'm lucky I live in sunny So. Cal! Maybe I should though, this last winter was a wet one! But I do remove the plugs and squirt a little oil and turn the engine by hand a few times before first start up.

 

[airdvr1227]

Re: Is fogging really necessary?

Update: Installed the reman carb the Weds. night. What a difference! Starts right up...idles smooth. I don't think my electric choke was working on the old unit.

Based on my results I will not be fogging my engine at the end of the season.

 

[180shabah]

Re: Is fogging really necessary?

...and don't change the plugs again, that way you won't break one....

 

[jmoe]

Re: Is fogging really necessary?

All the boats I winterize get fogging oil. If you think thats the problem with your carb then pull the spark plugs it's more work but it's definetly worth it.

 

[liquidlew]

Re: Is fogging really necessary?

...and don't change the plugs again, that way you won't break one....

!!!doh!!!

 

[VtSteve]

Re: Is fogging really necessary?

I have a 5.0 MPI, which I realize is more difficult to fog given an external tank requirement. But yesterday, my dealer told me they never fog the MPI's, because there's no need

I've never heard this, so therefore, I ask.