Some of the all time best smelling exhaust scents are produced by the use of Race Fuel / Race Gas, Nitro, Klotz 2T oil, Castor Oil etc. Men get more excited over these scents than the scent of a fine smelling woman.
You can buy Fuel Fragrance to make your exhaust smell like cherry, vanilla, grape, bubble gum, cotton candy, root beer and more. You can get a 4oz. bottle for $12-20, which adds scent to 20 gallons of gasoline. It’s highly rated. Try some.
HOW CAN WE MAKE OUR OWN FUEL FRAGRANCE?
Fragrance Oil: My limited research indicates that fragrance oil is a small amount synthetic ester based scent in a vegetable oil carrier. i.e. jojoba oil, apricot kernel oil, almond oil, avocado oil, coconut oil.
Some synthetic 2 cycle oils are ester based. Some synthetic 2 cycle racing oils have some percentage of castor oil. This leads me to theorize that there will be no conflict between gasoline, 2 cycle oil and a small amount of synthetic fragrance in vegetable oil. Let’s test this theory.
I mixed a small amount of fragrance oil, synthetic blend 2 cycle oil and gasoline. After letting it sit for 48 hours in a below freezing temperature garage, I see no signs of separation, fogging or gelling. It’s very clear.
The MSDS sheet for some fragrance oils claim they have a flash point of 200F. The flash point of some common 2 cycle oils is around 200F.
HOW MUCH FRAGRANCE OIL DO WE USE?
Thanks to the Lampe Berger (oil fragrance lamp) hobby for this fairly scientific baseline. A Lampe Berger is essentially a Bunsen Burner with scented oil mixed in the alcohol fuel. The common formula for Lampe Berger Fuel is 10 drops of fragrance oil per 16 ounces of 91% alcohol.
If we convert the 10 Drops per 16 ounces formula to a gallon of gasoline, we figure: 128 ounces in a gallon & 20 drops in a milliliter: 128 / 16 = 8, 8 X 10 = 80 Drops Per 128 Ounces or 4ML OF FRAGRANCE OIL PER GALLON.
THIS IS 4ML OF FRAGRANCE OIL
There is roughly 3785 milliliters in a gallon. We are adding 4 milliliters of fragrance oil to a gallon. This is a ‘pre-mix ratio’ of 950:1.
WILL FRAGRANCE OIL BURN CLEAN IN MY ENGINE?
The indoor Lampe Berger experts know that if you use too much fragrance oil in the lamp fuel, the lamp can produce a small amount of smoke and soot. Their testing proves 10 drops of oil per 16 ounces of alcohol of oil burns clean, while also producing a significant aroma.
This provides a reasonable amount of evidence that 4ml of fragrance oil will burn cleanly in a gallon of gasoline.
TESTING / RESULTS
ROUND ONE (4ML PER GALLON)
I drained the fuel from my 70cc two stroke scooter’s fuel tank, fuel pump and float bowl. I measured exactly one gallon of 40:1 premix gasoline. Using a graduated cylinder, I measured exactly 4ml of Vanilla Fragrance Oil and added it to the gallon of gasoline. I shook the mixture aggressively for 30 seconds and poured it in to the fuel tank of the scooter.
THE SMELL IS STRONGER THAN I EXPECTED
The exhaust smell is twice as strong as any common race fuel or two stroke exhaust smell. The smell is not overwhelming, but, it is easily strong enough to mask the smell of two stroke exhaust. After running the bike with the garage door open, my garage smelled like a candle and bath shop.
The scent is incredibly accurate and very professional in atmosphere. It smells exactly as if the smell is coming from scented candles or a fragrance oil burner.
ROUND TWO (1ML PER GALLON)
Same process with 1ml per gallon.
THE SMELL IS SUBTLE
It smells very good, but, it has less scent than a race fuel or scented two stroke oil. The scent is very light. It is not strong enough to cover the smell of two stroke exhaust.
ROUND THREE (2ML PER GALLON)
Same process with 2ml per gallon.
THAT SMELLS GOOD!
The smell of 2ml per gallon is strong enough to mask the smell of the two stroke exhaust, while at the same time remaining fairly subtle. The smell of 2ml per gallon is comparable to a scented 2 cycle oil or race fuel.
ROUND FOUR (2ML PER GALLON RIDE)
After riding the bike for 15+ minutes to bring it up to full operating temperature, the 2ml per gallon scent is not as strong as when the bike is being warmed up. When the two stroke engine warms up enough to stop smoking, the scent is slightly reduced.
These combined results provide an estimate of fragrance oil volume / scent potency.
VOLUME / SCENT POTENCY
4ML PER GALLON = SMELLY
3ML PER GALLON = SCENTED
2ML PER GALLON = LIGHTLY SCENTED
1ML PER GALLON = EXTRA LIGHTLY SCENTED
Results will vary. By general rule, the sweet, fruity and floral scents are the most potent.
AUTOMOTIVE USE
After round one of the above experiments, I poured the 4ML Per Gallon mixture in to the fuel tank of my truck. (4.3 liter V6) The fuel gauge was reading 3/4 tank. This was approximately 15 gallons of fuel and 4ml of fragrance oil.
I drove my truck for the first time in a couple weeks, after forgetting that I poured the scented fuel in there. When I stepped out of my truck with it running, I was startled by the smell of vanilla.
That is a mixture of approximately .25ML per gallon, producing a decent amount of exhaust fragrance.
The mixture and effect will vary drastically by type of engine.
Let us also take in to account the subjective nature of ‘smell’.
RACE SCENT
More than a few people have stated that the trademarked KLOTZ racing oil exhaust scent smells like, ‘Laundry Soap’, ‘Dryer Sheets’, ‘Fancy Soap’ etc. KLOTZ is also described as having a ‘sweet smell’. It’s seemingly a ‘fresh scent’ with a bit of sweet scent. With that stated, I have seen fragrance oils like, ‘Tide Laundry Detergent’, ‘Gain Laundry Detergent’, ‘Downy’, ‘Snuggle’ and so on, that can help one create their own ‘race scent’.
When you do a high RPM run while using factory scented two stroke oil, the extra heat causes the scent to smell sweeter and more intense. I am pleased to report that fragrance oil works in the same manner. After doing a high RPM run with the Baby Powder fragrance oil, I started smelling those extra sweet notes that one smells at the kart / motorcycle / RC racetrack.
CRAZY SCENTS
A small list of the most crazy scents. (not recommended)
Marijuana, Bacon, Beer, Cigar, Dill Pickle, Drakkar, Maple Pancakes, Pipe Tobacco
NOTICE / DISCLAIMER
This is a two stroke scooter / small engine / hobby blog. I am only recommending the possible use of a small amount of fragrance oil in a carbureted small engine.
The phenomenon is somewhat rare, but, some oils do not mix well together. As shown above, if you have a two stroke engine, mix a small amount of gasoline, fragrance oil and 2 cycle oil together, to check for signs of separation, fogging or gelling.
It has been said that you do not use certain fuel additives in certain fuel injected engines, as it can have some effect on sensors.
Using too much exhaust scent in public areas is borderline anti-social behavior / disturbing the peace. In this specific application, we are using fragrance to mask the ‘boat motor’ / ‘weed trimmer’ smell of generic 2 cycle oil / exhaust.
Benelli Quattronove 