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Car Forum / Australian Car Forums / General Car Topics (Australian group) / April 2006What happens when you put 100 pounds of boost through a Cummins diesel?
89KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> 91KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=9085.jpg&.src=ph> 63KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=6207.jpg&.src=ph> 63KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=c5a3.jpg&.src=ph> 44KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=763a.jpg&.src=ph> 68KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=9783.jpg&.src=ph> Errr, "Ouch?" Nah, never gunna happen in my 'lux :-)  Signature-------------------------------------------- 4x4 Hilux Auto Service Centre, BP 106 Timbuktu, Mali (West Africa) Tel: 292 91 52 Specialising in turbo diesel and R290 aircon -------------------------------------------- holy sh.t, never even thought such a thing was possible till now. | 89KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> | 91KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=9085.jpg&.src=ph> | 63KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=6207.jpg&.src=ph> | 63KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=c5a3.jpg&.src=ph> | 44KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=763a.jpg&.src=ph> | 68KB <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=9783.jpg&.src=ph> 100psi is ridiculous. the bolts would have just sheared off and up she went. > holy sh.t, never even thought such a thing was possible till now. > [quoted text clipped - 21 lines] > | > <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=9783.jpg&.src=ph> > holy sh.t, never even thought such a thing was possible till now. Nah, anything is possible with a diesel engine. "Are you sure?" "There's no sugar" :-) Signature-------------------------------------------- 4x4 Hilux Auto Service Centre, BP 106 Timbuktu, Mali (West Africa) Tel: 292 91 52 Specialising in turbo diesel and R290 aircon -------------------------------------------- > holy sh.t, never even thought such a thing was possible till now. At first it looked like a particularly zealous tech-instructor's "expanded" exhibit of a diesel for the class to get all touchy feely with. Jason > 89KB > <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> [quoted text clipped - 13 lines] > 68KB > <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=9783.jpg&.src=ph> Yep, it's r**ted all right. But I don't believe the '100 pounds boost' bit. A bit of a Google suggest I'm not alone in my doubts. John Mackesy > Yep, it's r**ted all right. But I don't believe the '100 pounds boost' > bit. A bit of a Google suggest I'm not alone in my doubts. In which direction are you dubious about the boost level? Guys were running >250 psi boost around the late 70s/early 80s in diesel tractor pull engines. Basically by running 3 stage turbos. the 'outside' one is huge (possibly need two) as it has to draw in about 16 times as much air as the engine would consume NA. It produces 30psi. 30psi is actually more accurately 15psi (accuracy in terms of semantics, not accuracy in the exact psi level, that, for the purpose of discussion is rounded up) + 30psi _absolute_, or the comp outlet is (optimally) around 3 times (absolute) the pressure of the incoming air The next stage would push out roughly 3 times absolute (so 45psix3 = 135psi absolute, or 110 psi boost. through the last stage, it'd develop (theoretically) 405 absolute, or around 390 psi boost. Obviously due to real world inefficiencies, they don't 'really' run that much, but 100psi is 'nothing' for a stuiably stout diesel in tractor pull competition. SignatureJohn McKenzie tosspam@aol.com abuse@aol.com abuse@yahoo.com abuse@hotmail.com abuse@msn.com abuse@sprint.com abuse@earthlink.com fraudinfo@psinet.com sweep.day@accc.gov.au Beaker was a tweaker uce@ftc.gov admin@loopback $LOGIN@localhost $LOGNAME@localhost $USER@localhost $USER@$HOST -h1024@localhost root@mailloop.com president@whitehouse.gov vice.president@whitehouse.gov abuse@iprimus.com.au abuse@cia.gov abuse@fbi.gov abuse@asio.gov.au abuse@federalpolice.gov.au they don't 'really' run that much, but 100psi is > 'nothing' for a stuiably stout diesel in tractor pull competition. Agreed. SignatureRegards Dan >> Yep, it's r**ted all right. But I don't believe the '100 pounds boost' >> bit. A bit of a Google suggest I'm not alone in my doubts. [quoted text clipped - 13 lines] > inefficiencies, they don't 'really' run that much, but 100psi is > 'nothing' for a stuiably stout diesel in tractor pull competition. I have often wondered why these engines produce so much black smoke. I guess they are run rich to limit combustion temperatures. If that is the case, could fuel starvation have caused the bang? Bill >I have often wondered why these engines produce so much black smoke. I guess >they are run rich to limit combustion temperatures. Makes no difference to a diesel. Overfueling is the result of relatively unsophisticated metering systems making sure the engine gets enough fuel to develop its best power across the rev range (at the expense of generating black smoke)... And, the old 855 Cummins didn't have a particularly sophisticated metering system, even in stock form. More recent regulations have forced them all to clean up their acts, considerably. >If that is the case, could fuel starvation have caused the bang? Nope. Fuel starvation only causes them to stop. :) SignatureJohn H > Makes no difference to a diesel. Overfueling is the result of > relatively unsophisticated metering systems making sure the engine > gets enough fuel to develop its best power across the rev range (at > the expense of generating black smoke)... And, the old 855 Cummins > didn't have a particularly sophisticated metering system, even in > stock form. Ahh, nothing like a good squeeling up of the tyres with huge cloud of black smoke, the sound from the exhaust is fantastic :-) I wouldn't have it any other way :-p Signature-------------------------------------------- 4x4 Hilux Auto Service Centre, BP 106 Timbuktu, Mali (West Africa) Tel: 292 91 52 Specialising in turbo diesel and R290 aircon -------------------------------------------- > More recent regulations have forced them all to clean up their acts, > considerably. To the point that the 1HZ Toyota engine is not going to be available much longer (end of this year, I think). SignatureAthol <http://cust.idl.com.au/athol> Linux Registered User # 254000 The state of infrastructure in New South Wales is a disgrace. I'm a Libran Engineer. I don't argue, I discuss. > I have often wondered why these engines produce so much black smoke. I guess > they are run rich to limit combustion temperatures. nope. To lower exhaust temps on a diesel, you lean them out. Generally speaking the excess black smoke is more a sign that the scope of fuel delivery is not as optimal as it could be. > If that is the case, could fuel starvation have caused the bang? The strain of converting around 19 times as much heat energy as that engine would deal with in NA form would be the main one. Given that they don't rev all that hard, producing 2000bhp (a purely hypothetical amount) will also mean 3-4 times as much torque as one might expect if mostly exposed to smaller petrol engines. SignatureJohn McKenzie tosspam@aol.com abuse@aol.com abuse@yahoo.com abuse@hotmail.com abuse@msn.com abuse@sprint.com abuse@earthlink.com fraudinfo@psinet.com sweep.day@accc.gov.au Beaker was a tweaker uce@ftc.gov admin@loopback $LOGIN@localhost $LOGNAME@localhost $USER@localhost $USER@$HOST -h1024@localhost root@mailloop.com president@whitehouse.gov vice.president@whitehouse.gov abuse@iprimus.com.au abuse@cia.gov abuse@fbi.gov abuse@asio.gov.au abuse@federalpolice.gov.au >>Yep, it's r**ted all right. But I don't believe the '100 pounds boost' >>bit. A bit of a Google suggest I'm not alone in my doubts. [quoted text clipped - 13 lines] > inefficiencies, they don't 'really' run that much, but 100psi is > 'nothing' for a stuiably stout diesel in tractor pull competition. It appears that particular engine wasn't "stout" enough for whatever boost it was running:-) Maybe so much boost stress's the block and gradual fatigue caused it to crack open, the walls of the block where it cracked didn't look all that thick so it wouldn't take much for a major failure to occur once there was a small crack. Daryl >> 89KB >> <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> [quoted text clipped - 18 lines] > > John Mackesy Hard to believe, but the power station turbo looks err... capable:-) SignatureToby. quidquid latine dictum sit, altum viditur >>> 89KB >>> <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> [quoted text clipped - 20 lines] > > Hard to believe, but the power station turbo looks err... capable:-) No sh.t. That thing probably sucks in low flying birds. Fraser > 89KB > <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> Must have been one hell of a bang:-) Daryl > 89KB > <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> > > 91KB Bah. Needs an worked 8V92 detroit diesel in it. :-) SignatureRegards Dan >> 89KB >> <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=f973.jpg&.src=ph> [quoted text clipped - 4 lines] > Needs an worked 8V92 detroit diesel in it. > :-) Duh... up the supercharger ratio enough with one of them, and you can use the diesel as a gas generator for the turbine - get the power outa that. Should work well enough. SignatureToby. quidquid latine dictum sit, altum viditur |
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