What happens when you put 100 pounds of boost through a Cummins diesel?

[Ext User(Diesel Damo)]

89KB
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[Ext User(Patrick Young)]

Errr, "Ouch?"

Nah, never gunna happen in my 'lux :-)

--
--------------------------------------------
4x4 Hilux Auto Service Centre,
BP 106 Timbuktu,
Mali (West Africa)
Tel: 292 91 52
Specialising in turbo diesel and R290 aircon
--------------------------------------------

[Ext User(TPr)]

holy shit, never even thought such a thing was possible till now.


"Diesel Damo" <Diesel_4WD@yahoo.com.au> wrote in message
news:1144628322.589496.128850@v46g2000cwv.googlegr oups.com...
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[Ext User(reg-john)]

100psi is ridiculous.

the bolts would have just sheared off and up she went.


"TPr" <Jnr@iinet.net.au> wrote in message
news:4439dde3$0$6827$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> holy shit, never even thought such a thing was possible till now.
>
>
> "Diesel Damo" <Diesel_4WD@yahoo.com.au> wrote in message
> news:1144628322.589496.128850@v46g2000cwv.googlegr oups.com...
> | 89KB
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>
>

[Ext User(patrick@hilux (Patrick Young)]

In article <4439dde3$0$6827$5a62ac22@per-qv1-newsreader-01.iinet.net.au>, "TPr" <Jnr@iinet.net.au> writes:

> holy shit, 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" :-)

--

--------------------------------------------
4x4 Hilux Auto Service Centre,
BP 106 Timbuktu,
Mali (West Africa)
Tel: 292 91 52
Specialising in turbo diesel and R290 aircon
--------------------------------------------

[Ext User(John Mackesy)]

Diesel Damo wrote:
> 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>
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> <http://au.pg.photos.yahoo.com/ph/diesel_4wd/detail?.dir=/f2a0&.dnm=6207.jpg&.src=ph>
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> <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>
>
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

[Ext User(D Walford)]

Diesel Damo wrote:
> 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

[Ext User(John McKenzie)]

John Mackesy wrote:
>
> >
> 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.

--
John McKenzie

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[Ext User(Dan---)]

"John McKenzie" <jmac@alphalink.com.au> wrote in message
news:443A2E75.6067@alphalink.com.au...
> John Mackesy wrote:
>>
they don't 'really' run that much, but 100psi is
> 'nothing' for a stuiably stout diesel in tractor pull competition.
>

Agreed.


--
Regards
Dan

[Ext User(Toby Ponsenby)]

On Mon, 10 Apr 2006 15:15:49 +1000, John Mackesy wrote:

> Diesel Damo wrote:
>> 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>
>>
> 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

Hard to believe, but the power station turbo looks err... capable:-)



--
Toby.
quidquid latine dictum
sit, altum viditur

[Ext User(Dan---)]

"Diesel Damo" <Diesel_4WD@yahoo.com.au> wrote in message
news:1144628322.589496.128850@v46g2000cwv.googlegr oups.com...
> 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.
:-)


--
Regards
Dan

[Ext User(Fraser Johnston)]

"Toby Ponsenby" <toby@privacy.net> wrote in message
news:1ked7wp1mjlbb$.194auln2mwzsn$.dlg@40tude.net. ..
> On Mon, 10 Apr 2006 15:15:49 +1000, John Mackesy wrote:
>
>> Diesel Damo wrote:
>>> 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>
>>>
>> 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
>
> Hard to believe, but the power station turbo looks err... capable:-)

No shit. That thing probably sucks in low flying birds.

Fraser

[Ext User(Bill Stoney)]

"John McKenzie" <jmac@alphalink.com.au> wrote in message
news:443A2E75.6067@alphalink.com.au...
> John Mackesy wrote:
>>
>> >
>> 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.
>
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

[Ext User(John_H)]

Bill Stoney wrote:
>
>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. :)

--
John H

[Ext User(D Walford)]

John McKenzie wrote:
> John Mackesy wrote:
>
>>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.
>
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

[Ext User(patrick@hilux (Patrick Young)]

In article <kjgm32h8op6eidvpg6e6p1c4eb49eg7t0r@4ax.com>, John_H <john4271@hotmail.com> writes:

> 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

--

--------------------------------------------
4x4 Hilux Auto Service Centre,
BP 106 Timbuktu,
Mali (West Africa)
Tel: 292 91 52
Specialising in turbo diesel and R290 aircon
--------------------------------------------

[Ext User(Toby Ponsenby)]

On Mon, 10 Apr 2006 21:36:38 +1000, Dan--- wrote:

> "Diesel Damo" <Diesel_4WD@yahoo.com.au> wrote in message
> news:1144628322.589496.128850@v46g2000cwv.googlegr oups.com...
>> 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.
> :-)

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.

--
Toby.
quidquid latine dictum
sit, altum viditur

[Ext User(John McKenzie)]

Bill Stoney wrote:
>
> 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.


--
John McKenzie

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[Ext User(athol)]

John_H <john4271@hotmail.com> wrote:

> 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).

--
Athol
<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.

[Ext User(Jason James)]

"TPr" <Jnr@iinet.net.au> wrote in message
news:4439dde3$0$6827$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> holy shit, 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