downinit25i said:
OK, this is nitpicky, but isopropyl alcohol and isopropanol are exactly the same molecule, just like ethyl alcohol and ethanol are the same (and can either get you drunk or power your car). You're right that you can buy it in different concentrations, but that would be the only difference.
Sorry, the chemical engineer in me that couldn't let that go...
There was a board discussion a while back about water injection that you were in, Litnin. Would you think that 10% of one third of a few ounces in a couple gallons of gas could hurt the engine that much? I'm curious because now I'm thinking of making my own seafoam too, but don't want to freeze the pistons.
Ok, let me clarify a little more.
The IPA that is in Seafoam is dehydrogenated and is VERY similar to
ketone acetate... NOT isopropyl alcohol.
I assume you've heard of products called "dry gas"?
These products contain Isopropanol. They are designed to solubilize (lawman's term: absorb) the water so it doesn't present a problem.
As far as the water in rubbing alcohol, no it wouldn't seize the pistons or anything like that.
The water injection is not used for cleansing, it's used for cooling when
there are extreme temps, boost, or high compression engines involved.
It's mostly for racing applications and simply isn't practical for street use.
Water injection is also a calculated injection amount and isn't just
randomly dumped in as few ounces in the tank.
One of the biggest things to note is:
Rubbing alcohol has a very low flash point and burns VERY quick.
The Isopropanol (dehydrogenated) that is in cleaners such as Seafoam
have a much higher flash point and won't pre-ignite.
If that rubbing alcohol pre-ignites, it will pre-ignite the fuel... and then
you have problems with detonation and pinging.
While Seafoam doesn't actually raise the octane level of the gasoline,
it does have a slight and 'same effect' of raising the octane.
Making your own "Seafoam" isn't a bad idea...
I wasn't trying to persuade against it, just make sure you use the 'correct'
ingredients in the correct ratios.
Seafoam uses the proportions because their research has found that to be the most effective without damaging components.
If you start making your own concoctions and using your own ratios,
do you know what kind of effect it would have, not only on the engine, but
more importantly the oil?
Use ketone acetone, not rubbing alcohol.