harrison801
16.05.2021 6:34:29
Now if this motor did run well at one time it's just something partially plugging the low speed circuit in the carb. more
See full version: Type of gas used in a 4 stroke engine
Now if this motor did run well at one time it's just something partially plugging the low speed circuit in the carb. more
I have a friend who has a 2 year old 4 stroke Mercury motor and has been having trouble with it. He was told it was bad gas and he had been using "marine gas".
I'm not quite sure what that is but he said its like normal gas for autos but missing something in it. Can someone tell me what marine gas is and is it bad to use standard regular gas in one of those 4 stroke motors?
E 85 and E 15 are not the same thing. the numeric designation ( 15 or 85) is the amount (%) of ethanol allowed in the fuel. It can be up to that amount but not to exceed.
As an example, E85 may be 78% Ethanol. E15 may be 13% ethanol.
The sale and use of AvGas is heavily-regulated. Most aircraft fuel dealers refuse to put AvGas into anything other than an aircraft fuel tank. There is a legal grey area that has some vendors willing to dispense AvGas into "approved" containers if they believe the end use of that AvGas is fueling an aircraft engine. This loop-hole is how some may obtain AvGas for automotive use. Because AvGas has no taxes and duties on it, use on public roads is illegal and if found could result in your vehicle being impounded. [links]
AvGas is blended for large-bore, long-stroke, low RPM engines which run at high altitude. While AvGas' higher octane is useful, smaller-bore, shorter-stroke, high RPM engines will perform better on racing fuel or high quality octane boosters. AvGas has lower volatility so when used in proportions higher than about 40%, part-throttle drivability and cold starts may be compromised. AvGas has a lower specific gravity so it will require a change in air-fuel ratio calibration for the engine to perform at its best. LL100 is blended with a high percentage of aromatics causing reduced throttle response which is not an issue with an aircraft engine but certainly an issue in a high-performance automotive engine. These high levels of aromatics will also damage rubber components in automotive fuel systems such as fuel lines, fuel pump seals and injector washers. [links]
AvGas is short for Aviation Gasoline. AvGas is of interest to motoring enthusiasts because of its availability, octane rating and low price compared to commercial race fuels. AvGas might seem an obvious choice but closer study raises some doubt.
AvGas LL100 stands for "Low Lead 100 Octane". TEL (Tetra-ethyl-lead) is added to raise the octane. When used in a motor vehicle this fuel will leave a lot of lead deposits in the motor. 100LL has a high lead content (0.5 grams per litre), even higher than leaded race fuels. The deposits left when TEL(lead) is burned are corrosive and damaging to valves, valve guides, valve seats and cylinder heads. Lead deposits will also block oxygen(lambda) sensors and catalytic converters and foul spark plugs even after only a short use. Also, 100LL has a chemical package added to make it perform at high altitude, and that isn't the best thing for motor vehicle performance here on the ground.
Avgas may be suitable for some race cars that don't have catalytic convertors or oxygen sensors and are rebuilt often enough that the TEL(lead) build-up is not an issue. For other applications use an unleaded race fuel or a good quality octane booster.
There are a couple of grades of Avgas
As for the people frowning about Ethanol free regular gas, do a google search for your local area. I know that here in Oregon, we have a gas distributor that will sell clear regular gas to private citizens by the gallon (or drum if you are so inclined). We live in a wonderful age where finding alternatives just takes time. more
As for the people frowning about Ethanol free regular gas, do a google search for your local area. I know that here in Oregon, we have a gas distributor that will sell clear regular gas to private citizens by the gallon (or drum if you are so inclined). We live in a wonderful age where finding alternatives just takes time.
I'm tired of the short shelf life of regular auto gas in my chainsaws, weedwhacker, generator, snowblower, and other small engines. Seems like I'm always having fuel related problems. Whether it's the ethanol or just poor quality gas I don't know. I use Stabil in my gas cans and it seems to help a little.
It works fine, generally. I've run it in generators, MANY hours in outboards, etc, etc. Never had a problem, and it's good clean fuel.more
Other than the additional cost are there any issues using 100LL in these engines? Fouled plugs? Can I mix it with 2 stroke oil for the saws?