I have also seen Diesel engines on cars in some countries with this arrangement. If the engine has a mechanical fuel pump they will run all day without any electrical input. Some injection pumps have an electrical solenoid that controls fuel supply and therefore is the usual way to stop the engine. A lot of more modern Diesel engines have an electrically driven injection pump and the engine stops when the electric is cut off. I believe that many of the larger Diesel engines commonly are stopped by depriving of air supply. In the case of a "runaway engine" where the engine is running on fuel sucked past the rings from the crankcase or from fuel sucked in through the air intake from a leaking turbo or from combustible gas in the environment, the only way to stop the engine is to stop the air supply, or occasionally with a lot of luck to overload the engine -- i.e., have it in gear and brake like crazy.
Derek W. Hargis ----- Original Message ----- From: "Paul Gobert" <[EMAIL PROTECTED]> To: <biofuel@yahoogroups.com> Sent: Monday, May 21, 2001 11:14 PM Subject: Re: [biofuel] Why you should fit a MIL > Steve, > Bit of a worry that gas in the air supply. How would you shut down the air > supply? Friend says he once worked on a diesel engine that had a butterfly > valve in the inlet (thinks it was a stationary engine), perhaps that was > what the valve was for? > Any thoughts on why it would be fitted otherwise? > Paul > > ----- Original Message ----- > From: "steve spence" <[EMAIL PROTECTED]> > To: <biofuel@yahoogroups.com> > Sent: Monday, May 21, 2001 10:39 PM > Subject: Re: [biofuel] Why you should fit a MIL > > > > Unless you have the ability to shutdown the air supply, diesels have been > > known to race uncontrollably: A) if crankcase oil gets suctioned in b) if > > there is a flammable gas in the air (saw this near a lp filling station) > > > > usual result is many small parts over large area :-) > > > > > > Steve Spence > > Subscribe to the Renewable Energy Newsletter: > > http://www.webconx.com/subscribe.htm > > > > Renewable Energy Pages - http://www.webconx.com > > Palm Pilot Pages - http://www.webconx.com/palm > > X10 Home Automation - http://www.webconx.com/x10 > > [EMAIL PROTECTED] > > (212) 894-3704 x3154 - voicemail/fax > > We do not inherit the earth from our ancestors, > > we borrow it from our children. > > -- > > > > ----- Original Message ----- > > From: "Paul Gobert" <[EMAIL PROTECTED]> > > To: <biofuel@yahoogroups.com> > > Sent: Sunday, May 20, 2001 8:37 PM > > Subject: Re: [biofuel] Why you should fit a MIL > > > > > > > David, > > > Thanks for the info, and for being so frank. You don't seem to have much > > > faith in my old Toyota. > > > The smoke it blows is black not blue and very little oil is used between > > > changes,not enough to justify adding oil. > > > It has always been a smokey engine despite attention to injectors etc. > The > > > ammount of smoke varies with engine load. Keeping the revs between > 2,500 > > > and 4,000 and using a small "throttle opening" minumises it. Adjusting > the > > > smoke screw only reduces the already inadequate performance. After > 350,000 > > > km the rings are most probably worn as indicated by the vehicles > tendency > > to > > > creep forwards when parked on a slope and restrained only by engine > > braking, > > > low-range first. > > > The following may sound like an add but should be familiar. > > > The Hilux is the most reliable,economical ,practicle vehicle I have ever > > > owned. (Lets not mention lack of comfort or character). Running costs so > > far > > > (fuel, oil,grease,servicing,parts, repairs,tyres,registration,insurance > > etc) > > > 11.9c/km. Fuel consumption 10L/100km. Last set of front tyres lasted > > > 81,000km,rears still going. Brakes relined 259,000 and 440,000. > > > Exhaust system replaced 259,000 and currently in good condition. > > > Clutch,gearbox,transfere case, front & rear diffs all origional. Used > > > daily, often carries load, current odometer reading 540,000km. End of > ad. > > > and no I wouldn't sell it for quids. > > > Lets consider the operation of 4 stroke diesel engines. > > > unlike their petrol equivalent, diesels have no variable restriction in > > the > > > inlet tract (butterfly in carb or air inlet for fuel injection). Oil > > burning > > > in the petrol 4 stroke is usually associated with worn rings/bore or > > > faulty/worn valve guides or valve stem seals. It is most obvious when > the > > > air pressure inside the cylinder is substantially less than that in the > > > sump. Such conditions occur when the throttle is suddenly closed at high > > rpm > > > or after prolonged idling. The diesel takes a full gulp of air at each > > > intake stroke regardless of "throttle setting" so the difference in > > pressure > > > between cylinder and sump at induction is not so great especially with > > > positive crankcase ventilation. > > > The increased pressure and temperature of the diesel engine combustion > > would > > > probably burn the lubricating oil more effectively producing black smoke > > > from an enriched mixture. > > > Ring blowby also feeds oil fumes to the intake. The original engine in > the > > > Hilux was treated to some spray start (ether) by an unsympathetic > > unknowing > > > moron ( me) when it refused to start one winter. (Glow plugs coated with > > > soot don't warm the preignition chambers too well). End result broken > > > rings. 50,000 km later things started to get interesting. The engine > began > > > to run on the crankcase fumes. Usually this would occur as the > "throttle" > > > was backed off just as a hill was crested. The engine would suddenly > roar > > > and rattle whilst belching black smoke from the exhaust. Very > > disconcerting > > > for those following. Not only would the engine run on the fumes but it > > would > > > accelerate. ( can't understand why when the ignition was occuring well > > > before injection point).The only way to calm it down was to apply the > > brakes > > > firmly until normal running resumed, don't know the theory behind this. > > > Braking was also disconcerting for those following. The only time I have > > > ever witnessed this in another vehicle was when a Diamond Rio was > > delivering > > > a load of coal to the factory where I worked. This was a spectacular > sight > > > and sound punctuated by the driver and his helper abandoning ship. > > > > > > Regards, > > > Paul. > > > > > > > > > Yahoo! Groups Sponsor > > > www. > > > > > > > > > > > > > > > > > > Biofuel at Journey to Forever: > > > http://journeytoforever.org/biofuel.html > > > Please do NOT send "unsubscribe" messages to the list address. > > > To unsubscribe, send an email to: > > > [EMAIL PROTECTED] > > > > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > > > > > > > > > > Biofuel at Journey to Forever: > > http://journeytoforever.org/biofuel.html > > Please do NOT send "unsubscribe" messages to the list address. > > To unsubscribe, send an email to: > > [EMAIL PROTECTED] > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > > > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > Please do NOT send "unsubscribe" messages to the list address. > To unsubscribe, send an email to: > [EMAIL PROTECTED] > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send "unsubscribe" messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
