Recent Topics
Consensus on Top 5 reasonably available filters
by circle1m
1 minute 50 seconds ago
Motul 8100 Eco-nergy 5W30
by circle1m
8 minutes 28 seconds ago
2001 Impreza OBS, M1 5W30, 5k on oil, 159k on car
by kaesees
16 minutes 14 seconds ago
Rear Wheel Bearing Advice Wanted
by Sluggo0018
24 minutes 53 seconds ago
Wix vs Dealership OEM Oil Filters
by SwedishRider
25 minutes 15 seconds ago
What failed in this headlight?
by spavel6
Today at 01:34 PM
Tribology of a Driveline Material
by MolaKule
Today at 01:14 PM
Euro Pennzoil Platinum w/ PurePlus - 0W-40, 5W-30
by vinu_neuro
Today at 01:03 PM
2011 Acadia 3,6L DI ACDelco Dexos 5W-30
by rbarrios
Today at 01:03 PM
Do PureOne Filters have an Anti-Drain Back Valve??
by AdmiralYoda
Today at 12:55 PM
Price check on vintage mopar
by pacem
Today at 12:35 PM
DONE with Rockauto
by jrustles
Today at 12:04 PM
Newest Members
kaesees, bprat318, Winter_Texan, SloopJohnB, world123
50815 Registered Users
Who's Online
118 registered (AdmiralYoda, 05LGTLtd, 2009Edge, 2KBMW, aquariuscsm, 10 invisible), 2002 Guests and 233 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50815 Members
64 Forums
217105 Topics
3418478 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#1674404 - 11/17/09 01:34 AM 99% Isopropyl alcohol as fuel additive?
SecondMonkey Offline


Registered: 10/09/07
Posts: 931
Loc: OR
I happen to have 10 spare gallons of 99% anhydrous isopropyl alcohol with no particular use. I'm wondering if I should use this as a fuel additive? I know that's all that "Heet" fuel dryer is made out of. Would it be really bad to add more alcohol on top of the 10% ethanol we already get? Could I use as an octane booster? The jeep has been pinging a little on 87 lately...

I remember once I was trying to start my lawnmower on old/wet fuel. It wasn't gonna happen. So I dumped a bottle of 91% rubbing alcohol into the gas tank to soak up the water, but, the engine actually ran great on the mix...probably about 50/50. It just so happens I was going to take the head off and replace the gasket anyway, and when I did, it was REALLY OBVIOUS that the big dose of alcohol had knocked off a lot of built up carbon. I wonder what the max safe ratio would be? Does this stuff eat rubber like ethanol and methanol?
_________________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein

Top
#1674538 - 11/17/09 07:33 AM Re: 99% Isopropyl alcohol as fuel additive? [Re: SecondMonkey]
doitmyself Offline


Registered: 06/03/02
Posts: 4668
Loc: MI
According to this site, it is not a good idea, but what do I know (not much)?

http://www.fueltestkit.com/is_gas_additive_safe_with_e10_list.html


Edited by doitmyself (11/17/09 07:41 AM)
Edit Reason: Update link

Top
#1674540 - 11/17/09 07:36 AM Re: 99% Isopropyl alcohol as fuel additive? [Re: SecondMonkey]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
What does that 1% consist of?
Isopropyl is not as horrible as methanol for corrosion and problems.
It has high octane, but you'd have to mix a lot to get meaningful increases.
Since the gas probably already has 10% alcohol in it, why not play it safe and add enough of your own to go up to 15% total [add it at a 5% extra rate]?
This is safe and will make good use of it.

Top
#1674572 - 11/17/09 08:12 AM Re: 99% Isopropyl alcohol as fuel additive? [Re: mechtech2]
dwcopple Offline


Registered: 10/11/04
Posts: 3356
Loc: Michigan
[censored] yes. Pour it in.
_________________________
2007 Ford Fusion SEL AWD
2006 Mercury Montego Luxury

Top
#1675394 - 11/17/09 07:28 PM Re: 99% Isopropyl alcohol as fuel additive? [Re: mechtech2]
SecondMonkey Offline


Registered: 10/09/07
Posts: 931
Loc: OR
Originally Posted By: mechtech2
What does that 1% consist of?

Most likely water. This is pretty pure grade lab stuff. Somebody paid a lot of money for it! LOL

Does anybody know the pure octane rating of isopropyl? Tried google but couldn't find anything...
_________________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein

Top
#1675636 - 11/17/09 10:25 PM Re: 99% Isopropyl alcohol as fuel additive? [Re: SecondMonkey]
Loobed Offline


Registered: 07/20/07
Posts: 3742
Loc: Northern California, USA
Originally Posted By: SecondMonkey
Originally Posted By: mechtech2
What does that 1% consist of?

Most likely water. This is pretty pure grade lab stuff. Somebody paid a lot of money for it! LOL

Does anybody know the pure octane rating of isopropyl? Tried google but couldn't find anything...



There may be some "smell-bad(R)" or "taste-bad(R)" in that 1%.

An alcohol drag engine usually has between 20 to 1 and 22 to 1 compression.

There are different types of alcohol and they are not all the same. Some are more soluble in water and others are more soluble in oil. I think it depends on the amount of carbon atoms and where the OH is attached.




Edited by Loobed (11/17/09 10:26 PM)
_________________________
Engine: 2001 GM 5.3L LM7
Current Fill: Valvoline Synpower 5w-30 w/Pure-One PL25288 filter

I.M.N Oil Enthusiast

Top
#1675926 - 11/18/09 07:18 AM Re: 99% Isopropyl alcohol as fuel additive? [Re: Loobed]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
A lot of my saved info is lost due to computer problems.
But figure about 105 octane for the isopropyl.
Any water will be held in suspension and be harmless.
We use corrosive methanol in the wheelstander.
Low compression with high valve overlap, but a lot of blower overdrive!

Top
#1675950 - 11/18/09 07:41 AM Re: 99% Isopropyl alcohol as fuel additive? [Re: mechtech2]
n8wvi Offline


Registered: 09/16/02
Posts: 622
Loc: 42.4N 85.7W
Could the cleaning have been from the water? If it was a 50/50 mix of gasoline and isopropyl, and the isopropyl was 91% alcohol and 9% water, you were running 4.5% water in your mix.

On a side not, while water may not TECHNICALLY raise octane, I think it reduces the need.
_________________________
'02 Outback EZ30 138k miles
'06 Ram 2500 5.9L CTD 27k miles
'10 Legacy GT EJ255 24k miles

Top
#1676748 - 11/18/09 07:23 PM Re: 99% Isopropyl alcohol as fuel additive? [Re: n8wvi]
SecondMonkey Offline


Registered: 10/09/07
Posts: 931
Loc: OR
Originally Posted By: n8wvi
Could the cleaning have been from the water? If it was a 50/50 mix of gasoline and isopropyl, and the isopropyl was 91% alcohol and 9% water, you were running 4.5% water in your mix.

I don't know, I was thinking about that. It sure was amazing to see though, I wish I would have taken pics. Maybe this spring I'll try it again under more controled conditions to see what happens. :) The extra high temp of the lawnmower engine might have something to do with it too, vs under 200 for a car engine.
_________________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein

Top