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Sometimes under full load/throttle
by
Smokey Eddy
on 15 Sep, 2008 01:00
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Sometimes when im givin 'er, merging onto the highway or similar situation, suddenly all i see in the rear view is a cloud of WHITE smoke, my pedal does absolutely nothing (like its floored), the speedo is climbing fast and i can smell something odd. When i shift up it tries to run away so i slam it into the next gear up to keep it from doing so. The smoke behind isn't black though its all white steam. I know this is coolant and HOW its happening but why is it happening? why doesn't it do this all the time.
This is from those ever so common cracks between the valves by the way so if you have em ... be warned :cry:
can anyone tell me why its like runing away but with no fuel (or seemingly no fuel)
This never used to happen. It tried to run away ONCE when i was foolish and had the fuel screw too high and didn't know what i was doing but it was black smoke and about 1/10th the amount. this is a HUUGEE amount of white.
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#1
by
gigaz2
on 15 Sep, 2008 01:43
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white/grey can also be fuel injected out of timing, so a sticky injector could be the culprit as well.
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#2
by
dillenger1
on 15 Sep, 2008 03:05
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Its the coolant injection :twisted: :twisted: :twisted:
sorry :oops:
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#3
by
Smokey Eddy
on 15 Sep, 2008 03:08
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i do have brutal knocking on two injectors.... but could that cause the running away and the coolant loss?
Yes:P i joke with my friends that i have water injection
(because it is extremely fast when it happens. So much so i'm really afraid of bending rods and such.)
a LOT of coolant get's dropped too. About 800mls to 1 litre every time it happens
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#4
by
Zulfiqar
on 15 Sep, 2008 05:01
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the strange bit is that coolant would not aid in acceleration would it?
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#5
by
arb
on 15 Sep, 2008 06:11
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the strange bit is that coolant would not aid in acceleration would it?
Why not ? You are converting some of that 50% from the diesel's total energy that would be simply heat, into steam that does work on the pistons. So, yes, HP increase. There are water injection kits that do this for you intentionally. OEM's don't do this as if people don't use alcohol water mix in the winter, the system would freeze and break.
Maybe part of your run-away is from oil spray blow-by caused by suddent excess combustion gasses ?
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#6
by
clbanman
on 15 Sep, 2008 09:19
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I always understood that water injection's purpose was to help prevent pre-ignition. As such it wouldn't actually make power, but allow engine settings that create more power. As far as "work" on the piston, I highly doubt that water turning into steam does so at a faster rate than the speed of fuel combustion, which is what would be required for the water itself to actually increase power.
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#7
by
jtanguay
on 15 Sep, 2008 09:26
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is your car at full operating temp when the white smoke comes out???
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#8
by
Smokey Eddy
on 15 Sep, 2008 11:11
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I dunno if it's at temp. The light flashes because the head leaks into it so its under way too much pressure and the flashing of the light stops it from reading or something.
the whole thing is screwed. On a previous thread about my head messing up my cooling someone said something about how a flashing light will cause the gauge not to read.
it's on zero basically all the time. It had been driving for about 5 minutes this last time. other times have been after 10 minutes. It's usually at temp i'd say.
Yes there is a collosal amount of blow by. If i drove with the breather even just a little bit off the intake port thing the whole place gets covered in oil.
I'm waiting on an aaz head to get it 1mm over'd
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#9
by
arb
on 15 Sep, 2008 11:58
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I always understood that water injection's purpose was to help prevent pre-ignition. As such it wouldn't actually make power, but allow engine settings that create more power. As far as "work" on the piston, I highly doubt that water turning into steam does so at a faster rate than the speed of fuel combustion, which is what would be required for the water itself to actually increase power.
pre-ignition on a spark ignition engine, yes. We have compression ignition.
From a 1942 NACA paper on water injection (when engine efficiency was life or death)
http://www.rbracing-rsr.com/downloads/naca_H2O.pdfPage 65 - "For a given power output, the specific fuel consumption was seen to be less with water mixtures."
Wartsila makes really BIG diesel engines for ships like the Queen Mary 2 that have water injection to reduce combustion temps and reduce emissions and fuel consumption :
http://www.wartsila.com/Wartsila/global/docs/en/ship_power/media_publications/brochures/enviroengine.pdf
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#10
by
Smokey Eddy
on 15 Sep, 2008 11:59
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That's rad. maybe i should keep my head i have
JUST kidddingggg
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#11
by
clbanman
on 15 Sep, 2008 17:54
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arb, yes but both examples say the water injection is done for either cooling or emissions. I still don't think water actually increases the force on the top of the piston, which is what would be required for "work". The water allows you to use engine settings or tuning to increase power which would otherwise create excess heat, or can be used to reduce emissions. I'm not saying water injection is not valid or usefull. Steam engines use water conversion to steam and the expansion to create force but it is very slow in terms of Rpm.