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/
