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Bell Overall Performance Fuel Concerns Series: Biodiesel Primer - The Great Along With The
Bell Functionality Fuel Issues Series: Biodiesel Primer - The good And the BadEXECUTIVE SUMMARYBiodiesel (fats converted into fuel) has become a substantial player inside the fuels marketplace, with production and use escalating exponentially since the mid-to-late 2000s. Biodiesel blends supply environmental and operational positive aspects for consumers, together with enhanced cetane and lubricity, and lower emissions. Biodiesel's biggest disadvantages are storage instability and gelling in cold weather conditions, which can change considerably based on the kind of oil from which the biodiesel was built.What is BIODIESEL?"Biodiesel" is often a body fat that has been chemical altered via a sequence of reactions, leading to a chemical that may be burned in a very diesel engine as fuel in put of regular #2 diesel fuel.Contrary towards the terms that are thrown close to inside the market and on World wide web message boards, the phrase "biodiesel" refers only towards the real "FAME" chemical that results through the chemical conversion of extra fat into fuel. The legal definition of biodiesel is "a extended chain fatty acid ester made up of just one alcohol molecule on an individual ester linkage". The acronym "FAME" stands for "fully alkylated methyl ester".Now some people discuss about placing straight raw vegetable oil or animal excessive fat within their auto, referring to this apply as burning biodiesel fuel. Nevertheless, raw vegetable oil chemically includes a few ester linkages (instead of only one) and thus is not legally defined as biodiesel. Raw vegetable incorporates a distinctive viscosity than biodiesel or diesel fuel (as much as 10x extra), and burning it in a diesel engine prospects to massive time engine deposits, ring sticking and lube oil dilution. This is true regardless of whether you just extend out your fuel by adding as little as 10% raw oil. The chemical conversion that turns raw vegetable oil into biodiesel FAME lowers its viscosity to that of diesel fuel, enabling it to burn up like diesel does while in the engine. Placing straight unconverted vegetable oil into your vehicle or boat is usually a recipe for engine troubles and catastrophe, no matter what these folks say.The sole term "biodiesel" generally refers on the 100% FAME merchandise. Pure biodiesel can be referred to as B100 (100% biodiesel). When biodiesel is mixed with diesel fuel, you will get a "biodiesel blend" that's designated as "Bxx", relating towards the proportion of biodiesel inside of the general mix. B2, B5, B11 and B20 would be the most popular and usually located blends. Blends previously mentioned 20% are a lot less generally observed simply because engine manufacturers usually do not warrant their engines to operate on blends over 20% biodiesel. In case you stay with B5 and that fuel is in specification, it can be illegal for an engine manufacturer to not honor the guarantee. B2 and B5 are incredibly generally identified in states that have a biodiesel mandate, these as Minnesota and Louisiana. Minnesota was the first state from the Union to mandate state-wide blending of biodiesel into all of their diesel fuel, starting in 2005.How can you MAKE BIODIESEL?The essential recipe for biodiesel is:100 models plant/animal oil + twenty models alcohol + catalyst ƒ one hundred models of FAME feed stock + ten units of recovered alcohol + 10 units crude glycerin.Another way to produce biodiesel is to take 100 lbs unwanted fat + 10 lbs short-chain alcohol (like methanol) + a catalyst (sodium or potassium hydroxide) to get one hundred lbs of biodiesel (about 13.5 gallons) and ten lbs of glycerin.These processes speak to why biodiesel manufacturing is relatively popular - the ingredients are cheap and easy to find and also the reaction processes are simple. The catalyst for the reaction is sodium hydroxide, and also the short-chain alcohol most usually used is methanol, both cheap and easy to find. The downside to all of this really is it really is also easy for the small-time "backyard" biodiesel producer to produce biodiesel that of "out-of-spec" if they are not careful within their processes. The consumer can avoid these concerns by only buying their biodiesel blend fuel from reputable suppliers.Benefits OF BIODIESEL USEBiodiesel blends present some great added benefits for consumers:1. Higher cetaneB100 incorporates a higher cetane number than most standard diesel fuels; high cetane rating means easier beginning for diesel engines and is comparable for the octane rating of gasoline. The cetane increase varies by the type of feed stock used to manufacture the biodiesel. Highly saturated fuels designed from animal fats (like leftover frying animal grease) can have higher cetane ratings as high as 70; polyunsaturated feed stocks (which include soy and rape seed) are decrease, closer to a 47 cetane rating. Of course, this cetane increase is blunted by the proportion of the biodiesel combined into the blend - a B5 only has 5% biodiesel in it, so the cetane increase is only 5% of what it would have been at B100.two. Low Sulfur ContentBiodiesel is naturally low sulfur, which makes it easy to incorporate into a fuel system without running afoul of the stringent ultra low sulfur diesel regulations, where sulfur content is capped at a mere 15 parts per million.3. Superior LubricityMixing biodiesel into ultra-low sulfur diesel solves a person of ultra-low sulfur (ULSD) diesel's biggest difficulties - its lack of lubricity. Removing the sulfur from diesel fuel destroys many of the substances from the fuel which enable it to lubricate engine parts like injectors and fuel pumps. But including as little as 2% biodiesel to a fuel mix gives 66% extra lubricity to #2 diesel than before.Nevertheless this lubricity increase isn't a linear a single, as the curve of added lubricity benefit to percent biodiesel levels off as the composition approaches just two.5%. So there is no additional benefit of added lubricity when comparing a B5 or a B20 to just a B2 mix.Still, 66% additional lubricity is actually a wonderful benefit to have.4. Cleaner EmissionsThis is the biggest reason why cities and government entities have recently started to include extra biodiesel in the fuel supplies for their municipal and transit fleets..Most large urban areas already fail EPA air standard qualities, placing them at risk of government action which could force them to adopt measures to improve air qualities or else lose federal monies. Taking action like switching to biodiesel blends can help meet these standards, and is additionally a great PR move, making the local government appear to be extra concerned about green problems.What emissions benefit does biodiesel use give? Depending on the mix proportion, biodiesel combustion benefits in reduce emissions for most measured emissions related to hydrocarbon combustion. Unburned hydrocarbons and particulate emissions (the nasty black smoke you can see coming from your stacks of diesel significant rigs) drops as much as 47-67% over straight diesel fuel alone.Biodiesel emissions have lower levels of polycyclic aromatic hydrocarbons (PACs) and other harmful carbon ring compounds than conventional diesel fuel. A B20 blend will lower those harmful compounds by 20-40%. This really is a very good thing for the reason that PACs have been linked to causing cancer.NOx emissions are also targeted by the EPA for the reason that NOx contributes to ozone production and poor air quality in urban areas (ozone from the sky is superior; ozone on the ground hurts your lungs). Biodiesel incorporates a neutral to slightly negative effect on NOx emissions; nonetheless, these figures are in dispute by some groups like the National Biodiesel Board and so research is still ongoing.The story is various when you go from a truck or boat to burning biodiesel within a home heating boiler system. NOx does decrease when biodiesel is burned in boilers/home heating oil, due to burner differences. When blended into heating oil, NOx emissions are reduced by 1% for each 1% biodiesel blend added. This reduction happens irrespective of what kind of feed stock used to make it..Issues AND Drawbacks WTH BIODIESEL USEBiodiesel's environmental gains are blunted by its fuel-related problems.1. Significantly less BTU energy value than Diesel = Much less MileageRelative to weight, the biodiesel FAME molecule has less energy than a diesel hydrocarbon chain molecule. Less energy and lower heat of combustion effects in decrease mileage.How much this drop is depends on who you ask and sometimes may be overstated. B100 is made up of 8.5% a lot less energy per gallon than diesel fuel. The biggest part of the energy difference is due on the FAME containing 12% greater oxygen - additional oxygen instead of carbon. When you factor in differences in density, this energy difference is reduced to 8.5%, apples to apples.Typical energy values for the two fuels are 118,170 BTU for B100 vs 129,050 BTU for #2 diesel. Having said that, at reduce blending ratios like B20, the drop is not noticeable by most drivers, given that 80% of the blend is now diesel fuel. So when using B20 or B5, you'll get some mileage drop, but it's not going to be around the order of 10 or 20% like some claim.2. Cold Flow problemsThe cold flow properties of biodiesel blends are highly dependent around the feed stock from which the biodiesel was designed. The level of saturation is the biggest factor here. Highly saturated feed stocks (palm oil, coconut oil, animal fats) have the worst cold flow properties but will be the most stable. The opposite is real for polyunsaturated feed stocks (rape seed, corn, canola oil) - they gel significantly less in cold climate but would be the most unstable.A typical B20 blend contains a gel point 3-10 degrees F higher than regular diesel. The cloud point for most B100 starts at 30-32 deg F for mono- and poly-unsaturated feed stocks (most vegetable oils) but is often up to 80 deg F for animal fats and highly saturated frying oils. When the fuel hits the cloud point, it gets hazy and will start the chain-reaction processes for gelling.Also problematic is that the biodiesel pour point is only a few degrees reduced than the cloud point. So when the fuel starts clouding up, it's going to gel up and develop into thick only a few degees below that. For example, soy FAME (pure B100) features a cloud point of 38 degrees F, CFPP of 28 and a pour point of 25 F. Other differences between cloud point and pour point are usually 8-10 degrees F total - not incredibly much.If feasible, gelled biodiesel might be restored by heating the fuel to dissolve the precipitated crystals. To get crystals back into solution, the fuel needs to be warmed back approximately 100-110 deg F to melt quite possibly the most highly saturated crystals back into solution. Nonetheless this does not help you in case you are stuck inside the middle of nowhere with a tank full of gelled biodiesel.3. Materials CompatibilityThis is really only a problem in older engines which use older materials like nitrile rubber, polypropylene, polyvinyl, or Tygon. The same is correct for older fuel storage systems. The average consumer with a more contemporary vehicle doesn't need to worry too much about it.For systems made up of these materials, they are all susceptible to attack from B100, which can damage these materials used in hoses and pump seals.4. Greater NOx EmissionsAs mentioned before, biodiesel can increase NOx creation in internal combustion engines, which is bad for urban air quality. Just how much this increase is can vary by feed stock; the difference in NOx emissions between high and low NOx feed stocks is about 15%.The composition of biodiesel determines how much NOx is produced. Much more highly unsaturated feed stocks produce higher NOx levels. Vegetable oil feed stocks will be the most unsaturated and animals fats or tropical oils will be the least, so you would expect vegetable FAMEs like soy and canola to merchandise the worst final results on NOx emissions.Why is this?Some past research has indicated that the elevated NOx production is related to differences in injection rates into the combustion chamber caused by biodiesel's higher "bulk modulus" (resistance to compression) and higher viscosity, which makes it much less compressible than regular diesel. A lot more technically, the higher bulk modulus and higher speed of sounds of biodiesel means the pressure rises faster from the fuel lines and develops an advance of nearly two degrees in injection timing within the engine. This in turn generates a faster pressure and temperature rise inside combustion chamber, leading to an increase in NOx.It's apparent the best way to reduce NOx is by modification of engine technology. Retarding the engine timing by 1-5 degrees can bring B100 NOx down to diesel baselines or below. Unfortunately, the tradeoff for doing this is certainly a reduction in power for the driver.5. Effects on engine lubricationBiodiesel use seems to possess a negative effect on the engine lubrication. As proof, European engine companies prescribe a 50-70% reduction in oil drain intervals with the use of blends previously mentioned B5. A practical reason for this might be that biodiesel's higher density and surface tension leads to far more fuel dilution of the lubrication inside the crankcase.So in case you use biodiesel and make a lot of short trips or drive in harsh or extreme conditions, it may be best to be extra careful in how often you change your oil. Most companies recommend every 5,000 to 7,000 miles on regular fuel. Using biodiesel could mean you need to err on the lower end of that scale.s6. Cleaning EffectsThe methyl esters in biodiesel have been used as low VOC (environmentally-friendly) cleaners for many year; they are excellent detergents. This is certainly not generally a excellent thing when you introduce them into a dirty storage or truck/boat fuel tank.When initial added to a fuel system, B100 dissolves any sediments present inside the fuel filter and fuel storage tank and can cause fuel filter clogging and bursting, leading to injector deposits.It truly is recommended to clean tanks and fuel systems before very first introduction of B100 to a system. Luckily, B20 is too dilute to possess a similar cleaning effect. So the average consumer may not have to worry about this too much.7. Stability IssuesThe typical shelf life for B100 manufactured from soy or canola oil is about four to six months in ideal conditions. Ultimately, the working storage life of biodiesel (like diesel) is dependent upon the storage conditions.For biodiesel, cold flow properties and stability seem to be corollaries - biodiesel with good cold flow response have poor stability and vice-versa. Biodiesel is susceptible to oxidation from exposure to air, water, light and certain metals. When it undergoes these reactions, it first becomes hazy, and then forms a thick precipitate gel. Analysis of this gel shows that it's mostly manufactured up of organic compounds which are directly produced by the "oxidative cleavage" of double-bonds inside the biodiesel molecule. In other words, oxygen-containing compounds (including water) will chemically attack biodiesel and break it apart, producing a mixture of components that combine to produce biodiesel gel and sediment.What causes biodiesel breakdown?What kind of compounds can contribute to biodiesel instability and breakdown? Contact with air provides the oxygen necessary to fuel oxidation reactions that break the fuel down. Contact with water causes the biodiesel to hydrolyze and form organic acids, which are partly responsible for the compatibility troubles with various rubbers. Contact with metals like tin and copper will degrade biodiesel and create sediments.Now a person might think that these instability effects are lessened when you simply dilute biodiesel in a B20 or significantly less blend. But it really is interesting to note that B100 does not produce sediments at the same rate that biodiesel blends like B5 and B20 will. It is since B100's higher viscosity and greater concentration of chemical bonds act to disperse and suspend these oxidative compounds, preventing them from working together to accelerate the chain reactions that lead to sediment formation. So, as a general rule, B100 is more stable than B20 and other biodiesel blends.When discussing biodiesel fuel stability, it's common to hear terms like Thermal Stability and Oxidative Stability. Thermal Stability refers to the fuel's ability to resist breakdown when exposed to heat for periods of time. B100 FAMEs tend to have good thermal stability features, due to the feed stock use in common cooking applications. If thermal breakdown did occur, injector coking would be probably the most likely engine problem associated with the poor-quality fuel.Oxidative Stability is the fuel's ability to resist oxidation when exposed to factors like air, water, and certain metals. This really is the biggest weakness of biodiesel. 1 reason for susceptibility to oxidation is that the processing of some of the feed stocks can remove natural antioxidants from the compound. Far more highly saturated feed stock seems to be additional resistant to this and have better oxidative stability.Occurrences of biodiesel oxidation are even higher in erratically-used engines, this sort of as generators and seasonal vehicles. Biodiesel blends that happen to be stored for prolonged periods of time accumulate water and are exposed to air and heat for very long periods of time, and have the greatest chance of developing microbial contamination, which may produce further acids that accelerate fuel breakdown.Why is this bad for engines?Biodiesel which has become oxidized in this manner does not burn up anywhere near as well as fresh biodiesel. Running this kind of fuel by way of the engine gives poor combustion, leading to a drop in mileage. Since it does not combust cleanly, it will form deposits from the injections and while in the combustion chamber, and this poor combustion also contributes to excessive emissions, meaning that you're going to lose some or all of the green emissions benefit you were getting by switching to biodiesel in the to begin with area.In addition to oxidative compounds like aldehydes and ketones, formic acid, acetic acid, other organic acids, water and methanol are common products produced by fuel degradation. These end products of the oxidation process may be harmful to fuel injector equipment and can cause difficulties this sort of as injector clogging, corrosion of FIE components, gelling at low temperatures, and fuel seal failure.COMPARISONS OF BIODIESEL FEED STOCKSIncrease demand and competition in the market mean that persons are making biodiesel from any feed stock they think could be suitable. As mentioned before, feed stocks give different characteristics for the biodiesel fuel, especially with respect to how stable they are and how well they resist gelling up in cold climate.Saturated feed stocks have high stability and cetane ratings, but possess a high cloud point, meaning they gel up at higher temperatures. Coconut oil, yellow grease and animal fats are examples of saturated oilsMonounsaturated feed stocks are while in the middle of the pack, with medium stability characteristics, cetane rating and cloud point. Examples of these feed stocks are peanut oil and canola oil. Some yellow greases also fall into this category if they are high in both saturated and monounsaturated components..Polyunsaturated feed stocks are most vegetables oils like soybean, corn and safflower oils. Biodiesel manufactured from these oil have low cetane ratings and poor stability characteristics but are most resistant to gelling up in cold weather conditions.Intuitively one would think that distinct climates across the nation would spur producers to make biodiesel from only the feed stocks that give the cold flow and stability characteristics which can be most advantageous for that climate. Animal fat biodiesels should work best in climates like Florida (never gets cold but is often humid). Vegetable oil biodiesels (much less stable; better cold functionality) should be preferred inside the northern climates, whether it isn't as humid (better storage conditions) but tends to get colder.Nevertheless, the market will often dictate what a producer will use to make fuel, and that means low price and availability would be the bigger concerns. That's legitimate around the world, where diverse countries make biodiesel from what's available to them. In Canada, they use fish oil and beef tallow. Palm oil is commonly used in tropical countries like Ecuador and Indonesia. In Europe, rapeseed is kind. Everyone uses what works for them.BIODIESEL SPECIFICATIONSOnly biodiesel FAME that meets all of the specification set down in ASTM D-6751 can legally be sold as "biodiesel". It's legally assumed that if the FAME meets specification along with the diesel fuel meets ASTM D-975 specifications, then any biodiesel blend built from those fuels will be in spec. The biodiesel specification ensures that the fuel meets minimum requirements for properties like Flash Point (ensures that it burns properly within the engine), Acid Number (ensures the fuel may be properly designed and is not already becoming unstable) and Free Glycerin (ensures all the waste glycerin may be washed from your fuel). The ASTM specification includes these and about ten other properties. If the biodiesel is properly manufactured, it will meet all these standards. If not, then it brings the potential for engine and performance difficulties for the consumer. As a consumer, buying your fuel from reputable suppliers will ensure your fuel meets this specification and won't give you any concerns..CONCLUSIONBiodiesel blends give helpful benefits to customers who are willing and able to side-step the difficulties associated with it. Many of these challenges is usually blunted by treating the fuel with an aftermarket products, of which there are many. As a consumer, you should expect many years of long-life from your equipment running on biodiesel.
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kx 250 is blowing white smoke starts fine is it a oil seal or gasket or rings people say its crank seal is?
is it oil seal crank seal or rings
Rings or valve guides would be blue smoke.....coolant is white smoke, and black smoke is fuel (running rich). If its WHITE smoke then it could be a head gasket, or a cracked cylinder.
How To Fit The Fork Oil Seal,Snap ring And Dust Seal To A Virago 250 Part 2
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