GB2421028A - Fuel for two-stroke engines - Google Patents

Fuel for two-stroke engines Download PDF

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Publication number
GB2421028A
GB2421028A GB0426855A GB0426855A GB2421028A GB 2421028 A GB2421028 A GB 2421028A GB 0426855 A GB0426855 A GB 0426855A GB 0426855 A GB0426855 A GB 0426855A GB 2421028 A GB2421028 A GB 2421028A
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GB
United Kingdom
Prior art keywords
fuel
stroke
engines
ethanol
castor oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0426855A
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GB0426855D0 (en
Inventor
Derek Lowe
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Individual
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Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0426855A priority Critical patent/GB2421028A/en
Publication of GB0426855D0 publication Critical patent/GB0426855D0/en
Priority to US11/721,147 priority patent/US20090223117A1/en
Priority to EP05823777A priority patent/EP1819803A1/en
Priority to PCT/GB2005/004702 priority patent/WO2006061611A1/en
Publication of GB2421028A publication Critical patent/GB2421028A/en
Withdrawn legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00Liquid carbonaceous fuels
    • C10L1/02Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
    • C10L1/023Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only for spark ignition
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00Liquid carbonaceous fuels
    • C10L1/10Liquid carbonaceous fuels containing additives
    • C10L1/14Organic compounds
    • C10L1/16Hydrocarbons
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32Esters
    • C10M105/38Esters of polyhydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/283Esters of polyhydroxy compounds
    • C10M2207/2835Esters of polyhydroxy compounds used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40Fatty vegetable or animal oils
    • C10M2207/401Fatty vegetable or animal oils used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/25Internal-combustion engines
    • C10N2040/255Gasoline engines
    • C10N2040/26Two-strokes or two-cycle engines

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

A fuel for two-stroke engines is made up primarily of ethanol and includes 0.5-8% castor oil and 3-25% volatile hydrocarbon fractions. The fuel may also include one or more additives selected from a range that includes corrosion inhibitors, combustion enhancers, solubility aids and cold starting promoters, and optionally water.

Description

FuJio1 Two-StrQke Eiigines The present invention relates to a fuel for use
in two-stroke internal combustion engines and in particular, but not exclusively, high-performance racing engines.
The fuel may also be suitable for use in other engines, for example outboard marine engines.
The principals underlying the present invention are to provide an innovative environmental solution to unacceptably high emission levels of unburned hydrocarbon emissions which are associated with "basic" twostroke engines.
These emissions can be very high when operating without the advantages of direct fuel injection. Moreover in the case of ultra-high speed twostroke engines; there is considerable doubt if direct injection systems can be made to operate at the frequencies demanded by the two-stroke cycle.
Gasoline direct injection delivers major improvements in both fuel consumption and in hydrocarbon (HO) emissions, when applied to two-stroke engines.
However, engines used in karting and in many other sectors which use the two- stroke cycle cannot justify expensive direct injection technologies and are still using some form of carburetor.
Some of the two-stroke engines used in karting rev to over 14,000 rpm and the application of direct injection technology is at the present time impractical at such high engine speeds. The real weakness of the "basic" two-stroke engine when using carburation and crankcase scavenging is exhaust emissions. The major problem is that some of the unburned hydrocarbon fuel manages to escape by "short circuiting" via the open exhaust port during the scavenging phase. This is the period when the products of combustion are leaving the cylinder and the fresh charge is being admitted Blair ("The Basic Design of Two-Stroke Engines", Warrendale, Pa.. Society of Automotive Engineers, 1990) conveys a picture of reasonably low Go, low NOx, but high unburned hydrocarbon emissions in respect of "basic" crankcase scavenged two- stroke engines. This poor emission picture relates to the discharge of unburned hydrocarbon fuels and to a lesser extent some lubricant.
However this picture will change completely if an environmentally friendly fuel and lubricant are used in the place of existing hydrocarbon fuel (gasoline).
The main exhaust gases are carbon-dioxide, nitrogen and water vapour. These are relatively benign; however the pollutants in the engine's exhaust are the products of incomplete combustion, namely carbon-monoxide and unburned hydrocarbons. The oxides of nitrogen (NOx) are the result of atmospheric nitrogen and oxygen being brought together under conditions of high temperature and pressure.
Emissions of carbon-monoxide can be minimised by good combustion chamber design and by operating with air I fuel ratios that are "lean" of stoichiometric (oxygen rich) Formation of NOx can be minimised by a reduction in the peak temperatures of combustion, and for this purpose a fuel which will absorb water is highly attractive.
Alternative fuels and lubricants are required to replace the toxic unburned fuel and lubricant which is emitted with the exhaust gases of the "basic" two-stroke engine The fuel and lubricant should be ones which will combine with some low cost NOx suppressing agent, and to this combination certain additives will be required to deal with various issues such as corrosion, solubility and cold starting.
According to the present invention there is provided a fuel for twostroke engines, that is based on ethanol and includes 0.5-8% castor oil and 3-25% volatile hydrocarbon fractions.
The key to this novel approach to the two-stroke emission problems is provided by ethanol. But a lubricant is required which will dissolve readily in ethanol and burn cleanly and is benign in the unburned form. Certain aero-engines were "run in" on castor oil during WWII. However, castor oil also behaves as a fuel when injected in some finely atomized form into diesel engines. Castor oil also dissolves in ethanol and within the combustion chamber it should burn cleanly, while unburned castor oil in the exhaust gases should be relatively benign. In contact with metallic rubbing and bearing surfaces castor oil has been shown to provide excellent lubrication.
I suggest an initial formulation to address the two-stroke emission problem, that is made up as follows: - say 1-4% castor oil, around 5-15% of appropriate hydrocarbon fractions which are selected for volatility ("front-end fractions", for example pentane, hexane or heptane) to act as a cold starting aid, the remainder of the fuel being ethanol, which is conveniently rated at 108 octane (RON). To this blend we can optionally add water, typically at between 3-10% water, to achieve NOx suppression and in order to avoid detonation. Tests indicate that water is soluble in these ethanol - hydrocarbon - castor oil blends The flame temperature of ethanol is lower than with gasoline and NOx is not a significant problem with the two-stroke cycle, however the addition of water is expected to further reduce engine temperatures.
Commercial fuels created in line with these proposals are likely to require a range of additives such as corrosion inhibitors, combustion enhancers and additives which aid solubility and cold starting, whilst keeping two-stroke emissions "eco- friendly." This is essential in the absence of any low cost direct injection systems for kart engines.
The single cylinder two-stroke kart engine has considerable advantages over comparable four stroke engines, in terms of simplicity, power I weight ratio, vibration durability and harshness Investigation shows that small capacity four- stroke engines are not particularly fuel efficient, as frictional losses associated with the valve gear begin to assume considerable proportions as cylinder size is reduced. There is also the added friction associated with additional inlet and exhaust strokes; these serve to reduce the mechanical efficiency of small, four stroke engines If a two-stroke fuel is made up primarily of ethyl alcohol and the lubricant is mainly castor oil it would seem the emissions of unburned fuel and lubricant would be largely composed of ethanol and castor oil. However, there are likely to be issues associated with corrosion, solubility and engine starting, all of which should be improved through the use of suitable additives. These may need development in order to be appropriate to this fuel, lubricant and engine technologies.
The two-stroke cycle is already low on NOx emissions and these proposals are likely to enhance those characteristics still further. Ethanol as a result of its high latent heat of evaporation creates a significant reduction in charge temperature compared with gasoline, and this will help reduce peak temperatures and NOx formation. The high latent heat of evaporation is invaluable to reduce charge temperature and increase charge density. The result is an increase in power output, and the fuel has a higher octane rating than gasoline karting fuels currently mandated by the FIA - 01K. This will permit the use of increased compression ratios leading to reduced fuel consumption This novel combination of fuel, lubricant and additives may also provide two- stroke outboard engines with the capability of meeting environmental standards for use in freshwater lakes and rivers The fuel may also be suitable for use in other two-stroke engines, for example in motor-mowers, chain saws, mopeds, trail bikes and a range of other simple two-stroke applications.
The two-stroke piston is exposed to twice the firing pulses of its four stroke counterpart. The exposure of the underside of the piston to lower Incoming charge temperatures of the ethanol based fuel I air mixture will assist in piston cooling There should be similar benefits by improving heat transfer from the lower parts of the cylinder bore. This is likely to prove advantageous with two- stroke engines, which are often vulnerable to overheating particularly around the exhaust port. Lower maximum and mean flame temperatures have been reported with ethanol fuel; this will help in NOx reduction and will reduce the heat load upon the piston which is important with the two- stroke cycle.
The impact of ethanol on the crankcase scavenged two-stroke engine should prove to be beneficial: by reducing the temperature of the bottom end bearings it is likely to improve durability. In fact it is possible that reduced temperatures will prolong the use of the air cooled two-stroke engine in karting and in other applications. Water readily dissolves in ethanol and this provides further opportunities to reduce peak combustion temperature, NOx formation and to avoid detonation.

Claims (6)

  1. Claims 1 A fuel for two-stroke engines, wherein the fuel is based on
    ethanol and includes 0 5-8% castor oil and 3-25% volatile hydrocarbon fractions.
  2. 2. A fuel according to claim 1, wherein the ethanol is rated at approximately 108 octane.
  3. 3. A fuel according to claim 1 or claim 2, that includes 1-4% castor oil.
  4. 4. A fuel according to any one of the preceding claims, that includes 515% volatile hydrocarbon fractions
  5. 5. A fuel according to any one of the preceding claims, that includes 1- 20% water, preferably 3-10% water.
  6. 6. A fuel according to any one of the preceding claims, that includes one or more additives selected from a range that includes corrosion inhibitors, combustion enhancers, solubility aids and cold starting promoters,
GB0426855A 2004-12-08 2004-12-08 Fuel for two-stroke engines Withdrawn GB2421028A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB0426855A GB2421028A (en) 2004-12-08 2004-12-08 Fuel for two-stroke engines
US11/721,147 US20090223117A1 (en) 2004-12-08 2005-12-07 Low toxicity fuel and lubricant for two-stroke engines
EP05823777A EP1819803A1 (en) 2004-12-08 2005-12-07 Low toxicity fuel and lubricant for two-stroke engines
PCT/GB2005/004702 WO2006061611A1 (en) 2004-12-08 2005-12-07 Low toxicity fuel and lubricant for two-stroke engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0426855A GB2421028A (en) 2004-12-08 2004-12-08 Fuel for two-stroke engines

Publications (2)

Publication Number Publication Date
GB0426855D0 GB0426855D0 (en) 2005-01-12
GB2421028A true GB2421028A (en) 2006-06-14

Family

ID=34073341

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0426855A Withdrawn GB2421028A (en) 2004-12-08 2004-12-08 Fuel for two-stroke engines

Country Status (4)

Country Link
US (1) US20090223117A1 (en)
EP (1) EP1819803A1 (en)
GB (1) GB2421028A (en)
WO (1) WO2006061611A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085460A1 (en) * 2008-02-01 2009-08-05 She Blends Holdings B.V. Environmentally improved motor fuels
RU2605952C1 (en) * 2015-12-25 2017-01-10 Акционерное общество "Всероссийский научно-исследовательский институт по переработке нефти" (АО "ВНИИ НП") Alternative motor fuel and production method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2605954C1 (en) * 2015-12-25 2017-01-10 Акционерное общество "Всероссийский научно-исследовательский институт по переработке нефти" (АО "ВНИИ НП") Alternative motor fuel and production method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333739A (en) * 1979-10-23 1982-06-08 Neves Alan M Blended ethanol fuel
US4405337A (en) * 1980-04-10 1983-09-20 Yanmar Diesel Engine Co., Ltd. Fuel for diesel engine
US4929252A (en) * 1989-06-15 1990-05-29 Brillhart Donald D Fuel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2365009A (en) * 1940-12-19 1944-12-12 Standard Oil Dev Co Motor fuels
DE3924583C1 (en) * 1989-07-25 1990-11-08 Hans 7432 Bad Urach De Schur
TW253907B (en) * 1992-07-09 1995-08-11 Lubrizol Corp
SE510104C2 (en) * 1993-08-19 1999-04-19 Berol Nobel Ab Ethanol fuel and use of an ignition enhancer
US5505867A (en) * 1994-07-06 1996-04-09 Ritter; Clyde G. Fuel and Lubrication oil additive

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333739A (en) * 1979-10-23 1982-06-08 Neves Alan M Blended ethanol fuel
US4405337A (en) * 1980-04-10 1983-09-20 Yanmar Diesel Engine Co., Ltd. Fuel for diesel engine
US4929252A (en) * 1989-06-15 1990-05-29 Brillhart Donald D Fuel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Bulletin JSME 26 (216) 1983. Murayama T et.al. "A study on diesel engines with alcohol fuels" pages 1043-1049 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085460A1 (en) * 2008-02-01 2009-08-05 She Blends Holdings B.V. Environmentally improved motor fuels
WO2009096788A1 (en) * 2008-02-01 2009-08-06 She Blends Holding B.V. Environmentally improved motor fuels
US9303222B2 (en) 2008-02-01 2016-04-05 She Blends Holding B.V. Environmentally improved motor fuels
RU2605952C1 (en) * 2015-12-25 2017-01-10 Акционерное общество "Всероссийский научно-исследовательский институт по переработке нефти" (АО "ВНИИ НП") Alternative motor fuel and production method thereof

Also Published As

Publication number Publication date
WO2006061611A1 (en) 2006-06-15
US20090223117A1 (en) 2009-09-10
EP1819803A1 (en) 2007-08-22
GB0426855D0 (en) 2005-01-12

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