snip
Not preignite but detonate...also I think the flamefront moves at the same speed as for lower octane. The advantage is that you can build engines which have higher compression (and/or use more spark advance) which will extract more POWER from the fuel WITHOUT DETONATING which is both damaging to the engine and somewhat wasteful of fuel energy...
Yeah Gord, kind of like explaining BTU's of different "qualities" of fuel.
As for acetone, I had some and tried it last year just to see. Ran it several times and basically could see no change in mileage. Pain in the ass to handle cleanly
No aurgment there
I just talked with a friend last night,and he mentioned that he had tried the acetone in his Nissan Xterra. So far it does look promising for him,he's gonna run a couple more tanks with/without it to experiment a bit more.. So far it looks like he may have gained about 20 extra miles per tank.
The real test would be for him do to it with someone else's car, like a spouse, without the other driver knowing.
20 miles per tank is probably about 1 MPG in an Xterra. I can typically get an extra MPG in my Tacoma by paying attention to my acceleration rates and highway speeds.
God!...patent it quick before Shell Oil finds out...you'll make billions!...
Tried this, with a bunch of other folks. No mpg advantages, but smoother running was observed.
They do know....but you also had folks worried about vapor pressure leaking into the air at the gas cap.With many mods to cars,fuel, and fuel filler pumps to fix that.
Tried this for two months in a 95 Subaru on my 100km daily commute. No difference or difference too small to measure.
Methodology was to reset my trip odometer upon fillup and compute l/100km based upon the amount of fuel I managed to fit in the tank divided by the distance travelled on the last fillup. Always the same gas station, but not always the same pump.
This was compared to economy for two months preceeding and one month after the test. I would have done more than one month after but then temperatures started to drop below 10 C and I know that economy drops as the temperature does.
Higher octane = higher power or "better for your engine" are myths so often told that they have almost achieved the status of fact. Fuels with higher octane ratings were developed for one main purpose: to burn more slowly to prevent pre-ignition knock in higher-compression engines. The higher the octane number, the more slowly the gasoline combusts when ignited. Because high-compression engines are usually higher-powered engines as well, it's easy to attribute some of that power to the fuel.
Aviation fuels are designed not to boil at higher altitudes, so the octane rating is achieved by using one grade of fuel, rather than blending several octanes together as would be acceptable in auto gas. Another factor is that most light aircraft use air-cooled engines, which can run at higher temperatures which can also lead to pre-ignition, so a higher octane fuel is used.
"JoeSP" wrote: snip
You've got so many errors in this post that it's difficult to know where to start...
That one is likely the closest to fact that I see here.
Well, it's probably safe to say that ALL the power comes from the fuel...Christ on a crutch...
What the 'ell that has to do with anything I have no idea...
Well, almost all 'light aircraft use liquid cooled engines so this doesn't mean much...most run at a designed temp not far from each other.
The first line in this cite reads: " ...Engine knocking is the premature detonation of fuel in the compression stroke of the engine"
...so I quit reading at that point because detonation (or knocking) occurs well into the power stroke, near the end of it actually...certainly -not- on the compression stroke...aaand what the hell is "premature detonation"?!?. I think some kid wrote that webpage...
Ok...
Well, it -is- worth it -if- the engine tends to knock on a lower octane fuel.
You said it good Joe. One of the more elucidating explanations of how premium fuels really work.
My God...we're all doomed...
maybe, just maybe it cleans some deposits out. We used to pour a little water into the carb. It cleaned the carbon. Have you ever taken apart a motor that blew it's head gasket. the water turns to steam. don't do too much or with lock the motor and bend the rods.
Do we not think that, should the addition of a very cheap chemical to normal fuel make you get X% more efficiency, large oil companies might be doing it and yelling about their special fuel - seeing as both BP and Shell yell about the added mpg of their ultimate and optimax with loads of fancy (and no doubt expensive) additives? J
Do we not think that, should the addition of a very cheap chemical to normal fuel make you get X% more efficiency, large oil companies might be doing it and yelling about their special fuel - seeing as both BP and Shell yell about the added mpg of their ultimate and optimax with loads of fancy (and no doubt expensive) additives? J
Acetone eats through rubber and plastic quite well. Putting some in your gas would eat your fuel lines and filters probably causing a fire or explosion. I would not suggest trying this unless you are doing so in a safe myth-busters fashion or your car will be totaled at best, you and other wounded/dead at worst.
I don't know about fuel efficiency but... But when I was 19 ('1978') I worked at gas station and the mechanics told me about the Acetone trick.
BE VERY CAREFUL!! This mixture is more powerful than the aviation gas some of us used to put in our fuel tanks.
I ran my '74' Cuda' on 1 quart. Acetone to 10 gal. of regular gas (leaded, you know from the olden days.) Now this Cuda' only had a 318 and a 2 barrel carb (340 T/A heads and exhaust, straight pipes). but it ate Corvettes for lunch and made Porsche's cry. (smile as you pass that 928 turbo at 175 mph) Don't believe me, try it yourself.
As I understand it..., when the Acetone molecule ignites it releases an extra molecule of Oxygen. This was explained to me by a chemist I make know claims of fact in this regard.
Things to take note of: On acceleration your temperature gauge will go up almost as fast as your tachometer. (need to adjust the thermostat in the radiator, or enhance the cooling system.) You will need to change your gas filter more often since adding acetone will clean every part of the full system. ( as much as 3 times in the first month) Acetone dries out rubber, you will be replacing hoses more often. (use the racing alternatives.) Check you spark plugs often, scorching on them means scorched heads, valves, & rings. Switch to 20/40 weight oil for diesel engines as the added heat will destroy other oils. The above mixture is high enough, adding more than this mixture WILL BLOW UP YOUR ENGINE!!
Race safely!
Pretty hilarious kid...if your profession isn't 'comedian' then you missed your calling...
This is no surprise. Aviation gasoline is just high aromatic gasoline with lead in it. It has a higher antiknock index than road gasoline, so it will allow you to run higher compression, higher temperature, or both. It has about the same specific heat content as road gasoline.
I haven't studied the acetone trick, so I don't know what effect it might have or how it might increase your performance. I have a neighbor who is a hotrodder, and he swears by xylene, and runs about a gallon or so of it in his tank when he's going racing. He's getting around 750 horsepower out of a 2.5 liter engine, so he must be doing something right.
I'm more interested to see what the effects of alcohol in the gasoline are, and for that information I have to look no further than Brazil. If I had any vehicles with Otto engines I'd run them on E85 if I had the chance.
My little old truck is a diesel, and I've been running it on B100, but now my supplier has made the decision not to sell it in small quantities anymore, so I'm looking to build a trailer with a tank on it so I can buy it in bulk.
AP
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