Got a TOMOS SPRINT. Just wondering,should I not run it because of the ethanal?
Got a TOMOS SPRINT. Just wondering,should I not run it because of the ethanal?
no ethanol
I ran 100 octane in a magnum, felt a solid 2 mph faster.
I run 93 octane. Lessens the chance of detonation.
It just makes me feel better when I run it, haha.
high octane is good because it is a more efficient burn for the amount of fuel going into your engine. ethanol is not recommended because it is government subsidized and WEAK SHIT and not meant to be ran in fine german, french, italian or otherwise motors.
Fred's guide states that mopeds have low performance engines that require the lowest amount of octane, 87 is fine, anything higher is also fine, it just won't give you any performance benefits, this is with a stock setup I presume, ie: not kitted
It's my understanding that ethanol acts as a solvent, thereby preventing your mix oil from being able to work fully, so I guess one could say, running high octane is less of a good idea if you are running bushings instead of roller bearings or are running non-synthetic.
i always run the most expensive stuff. i end up paying like $.50 more a every couple weeks, but it seems worth it maybe
AVGas does not go bad.
Are you all suggesting that high octane gas (93 here) has less ethanol?
"I quote...":http://www.ftc.gov/bcp/edu/pubs/consumer/autos/aut12.shtm
_Are you tempted to buy a high octane gasoline for your car because you want to improve its performance? If so, take note: the recommended gasoline for most cars is regular octane. In fact, in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage or run cleaner. Your best bet: listen to your owner's manual._
_The only time you might need to switch to a higher octane level is if your car engine knocks when you use the recommended fuel. This happens to a small percentage of cars._
_Unless your engine is knocking, buying higher octane gasoline is a waste of money, too. Premium gas costs 15 to 20 cents per gallon more than regular. That can add up to $100 or more a year in extra costs. Studies indicate that altogether, drivers may be spending hundreds of millions of dollars each year for higher octane gas than they need._
"... and quote more...":http://en.wikipedia.org/wiki/Octane_rating
_Octane rating does not relate to the energy content of the fuel (see heating value). It is only a measure of the fuel's tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner._
And, as I understand it, ethanol is a common additive to raise octane levels because of it's 116 RON level, and because hicks line the pockets of politicians, but... break>
_Ethanol has been advertised as a safe alternative by the agricultural interest groups in the USA and Europe. Its lack of toxicity is not different from MTBE, but as a polar solvent, it drives off nonpolar hydrocarbons from the gasoline, a problem that MTBE does not cause. Volatile hydrocarbons in gasoline vapors are known carcinogens and produce photochemical smog. Ethanol's higher cost requires government intervention in the form of subsidies or mandated usage to be competitive. In 2003, California was the first U.S. state to start replacing MTBE with ethanol. Several other states started switching soon thereafter._
AVGas smells nice and burns cooler.
Auto-tax free.
Sales tax free.
And your garage won't smell like a lawnmower or weedwacker, it will smell like Hawaiin Punch.
If your running high compression and detonating on low octane gas then by all means run high octane. On a stock bike, or a bike without high compression you probably wont notice the difference, other than it costs more. Most stock mopeds have 9:1 compression or less! Also keep in mind that when you mix oil into the gasoline the octane rating is lowered somewhat.
Higher compression needs a higher octane gas. Using a HO gas in your old moped is a waste of money.
Running HO in a new car is a waste. They have anti knock sensors and computers that constantly adjust for changing conditions. If you have an older car w/o a computer HO is better to be safe.
I remember reading about a fully built evo6 that made two hundred or so more horsepower on race gas as opposed to 87 octane.
High octane gas (ie race gas, AVgas, etc) is only needed if you're running more than 12:1 compression. The higher octane prevents you from detonating or "knocking" when running really high compression. However, on a 2-stroke it is near impossible to tell if you're "knocking" or "detonating" without actually seeing physical damage on either the cylinder head or piston crown. Detonation will look like salt and pepper specks on the piston crown and cylinder head. Stock mopeds only run 8:1 to 10:1 compression, thereby only needing 87 octane to run well. When it comes down to compression ratios, there is a fine balance between having higher compression or more cylinder fill. Obviously to have higher compression, your combustion chamber must be smaller in volume. Having a smaller combustion chamber volume, will result in less volume for air-fuel mixture. Less air-fuel mixture will result in a smaller combustion, creating less power. So like I said, there's a fine line with playing with compression ratios vs cylinder fill.
The nice smell keeps my girlfriend mopeding. . .
So it is the price to pay.
back in the day some people used camp fuel, so there is pretty much no harm in running ethanol fuel, why do you thing that they made 85% ethanol gas, because at 100% youd see some idiot at the pump getting a sip
If it is for your 2009 sprint it is an a55 and your owners manuel states that you have 10:1 compression ratio (which is considered high compression) and to use 91 octane.
Yes, but I have a (70cc Kitted motor!!) Also, does anybody know the stock rear gear on a 2009 TOMOS SPRINT? Front is 26 I think. I put 70cc kit, tecnigas pipe, and up-jetted. Also: got 22 rear and 27 front on it. I weigh to much to do a 20 rear, unipod up-jet and anything else;it can barely handle the heat now me being 215 lbs.
ive used 87 octane in my ped and i use amzoil interceptor 2 stroke oil. i use 93 octane now with the same oil and i got a 1 mph increase.
so in all reality it doesnt really make a difference.
and btw the interceptor oil is awesome. ive never had it foul out a plug. and you can put alot of oil in the gas. i mean alot!
i strongly recommend it.
If you have an airsal kit, you are running a little higher than 10:1 (like about 10.5:1) and should be running 91 octane as well.
The stock sprockets are 26t front and 28t rear. For your weight I would use 26t front and 22t rear sprockets with the kit.
For longevity and reliability of your motor you should use a 19 or 20 mm carb for proper cylinder fill. Jcam's 20vm or a 19 phbg are good set ups.
I actually had a 26F 22R gearing and knew I could stand an up to 27 in front. It had so much accel. and could rev so high so easily. But, good guess. If I weigh more, I will certainly have to gear to something lower like (26F or 24,26 28)rear maby. About running better cylinder fill; I've heard that the post 2006 TOMOS come with better carbs. I really don't know much, but I run pretty hot now, but not to hot.
How many PSI does 12:1 translate to? I feel like PSI compression would be a better way to quantify if you should be running higher octane gas.
There was a short run of a55s or what was known as the a52 and some of those came with a phva 16 bd back in 2005. They were extra fast and far too few. All other standard a55 came with a phva 14 bd. A high reving 50 cc motor will like a 16 mm carb. For the a55 airsal kit which is I believe 67 cc will want anywhere from an 18 mm to 20 mm carb.
Psi from a compression gauge for a piston port is very misleading as there are no valves. Correct compression ratio is done by ccing out the combustion chamber.
is it the difference in volume between BDC and TDC? Or once the ports are closed, ie. top of the exhaust port and TDC?
I put 87 in my blaster this week and I swear it's slower. Seriously. Will switch back to 93 when this is all gone and report back. I have very high compression.
that's a really good question because there is no compression on the charge before the port closes.
record speeds of ped. put in better octane gas repeat/record again same spots. if it actually helps run it. if you don't think the increase or lack there of is worth the 20c don't run it. some gas companies put junk in their gas on the lower octane stuff, others on the higher octane.
I'm involved in the fuel supply business and work closely with many refineries on a daily basis. It's not uncommon to find gasoline commingled in central terminals (different manufacturers in the same tank). When the transports come to the loading racks to get fuel for delivery to gas stations or wherever, they punch in a code and it dispenses the fuel, and then injects the specific manufacture's additive at the loading rack, Chevron - Techroline, whatever. Most refineries don't have room to keep all of the product they make within the facility and so they ship it to storage terminals through pipelines.
That's why I laugh sometimes at people who are so adamant about using one brand or another. Disclaimer: This is not the case when transports load directly from their refinery.
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