Stupid things non petrolheads say....
Discussion
Scuffers said:
shoestring7 said:
Cylinder 8 said:
ChemicalChaos said:
SS7
Turbo by definition is a supercharger driven by a turbine.
SS7
dayman0 said:
A mate got in my Fiesta ST the other day and after a bit of semi-spirited driving (enough to hear the 4 pot powaaaa) he asked me if it was a diesel. Now I'm sad.
I left my TTS (2.0 turbo petrol) with a detailer for some paint correction.When I picked it up he said "I was surprised it was a diesel".
They do sound dieselly at idle but not THAT dieselly!
I
Oh dear.Not quite as insane as it appears; it seems Alfa Romeo dabbled with oil pressure driven turbos: http://en.wikipedia.org/wiki/Alfa_Romeo_GTA#GTA-SA
SS7Supercharger, not turbo
Turbo by definition is a supercharger driven by a turbine."A turbine, from the Greek τύρβη, tyrbē, ("turbulence"),[1][2] is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work."
I'm guessing the oil would be driving a turbine of some sort.
Scuffers said:
shoestring7 said:
Cylinder 8 said:
ChemicalChaos said:
SS7
Turbo by definition is a supercharger driven by a turbine.
I'm guessing the oil would be driving a turbine of some sort.
shoestring7 said:
Common usage is that a supercharger is mechanically driven. I imagine these babies are as laggy as any early KKK job.
SS7
not sure about that? Laggy as in mechanically lag is unlikely, no reason a hydraulic drive would be? (it's not like it has to wait for exhaust pressure to build up.SS7
xRIEx said:
"A turbine, from the Greek t??ß?, tyrbe, ("turbulence"),[1][2] is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work."
I'm guessing the oil would be driving a turbine of some sort.
don't know, I would have thought they were using a hydraulic motor rather than a turbine? (looking at pictures of the install, the pipework is pretty small bore for s turbine).I'm guessing the oil would be driving a turbine of some sort.
doing a quick google cam back with this:
"It used an engine-driven variable displacement pump to maintain compressor speed."
(from here: http://www.autocomponenti.com/tech.htm)
RizzoTheRat said:
The oil would be driving a compressor. A turbine is a device that gets take energy from the airflow.
The compressor is the other end of the shaft, the turbine (or gears, or motor) drives the compressor (also known as the supercharger), which pressurises the intake airflow (or other fluid). I'm not sure there's a reason why you couldn't have an oil driven turbine, although given the viscosity of oil, it's probably a bit overkill, although I don't know much about them. An oil driven pump or motor would suffice I would think.
Super Slo Mo said:
RizzoTheRat said:
The oil would be driving a compressor. A turbine is a device that gets take energy from the airflow.
The compressor is the other end of the shaft, the turbine (or gears, or motor) drives the compressor (also known as the supercharger), which pressurises the intake airflow (or other fluid). I'm not sure there's a reason why you couldn't have an oil driven turbine, although given the viscosity of oil, it's probably a bit overkill, although I don't know much about them. An oil driven pump or motor would suffice I would think.
MartG said:
So the engine drives an oil pump that drives a turbine that drives the compressor - thus adding a whole load of inefficiency compared to the engine just driving the compressor directly
Yes, but with a centrifugal compressor, if you direct drive it, its output will be nothing till high rpm.This solution has the ability to vary the gearing between crank and compressor.
Hugo a Gogo said:
ADM06 said:
I drive a very slow fiesta van and find people holding me up all the time.
Most "drivers" forget their car will go past 2000rpm.
which is why they think diesels are fastMost "drivers" forget their car will go past 2000rpm.
because they have been driving petrol cars like that, and now are suddenly in the power band at 2000rpm
People at work wax lyrical about how much power their latest diesel eurobox has (usually things like the aforementioned 1.5 Nissan Qashqai).
To put it into perspective here is a 'grudge' race between my friend Jon and I.
You Tube link to race
My car runs low 13's; it is not a fast car in drag racing terms.
Jon's car is a 2005 2.0L diesel people carrier 130hp and 310lb/ft. Bear in mind that it also has all five of the rear seats removed so it is considerably lighter (those seats are f
king heavy) than its normal curb weight.My car is doing 10mph more at the 1/8th mile point than the Sharan is doing at the the point it goes through the full 1/4.
I went red by 0.0571 of a second for those that are wondering.
MartG said:
Super Slo Mo said:
RizzoTheRat said:
The oil would be driving a compressor. A turbine is a device that gets take energy from the airflow.
The compressor is the other end of the shaft, the turbine (or gears, or motor) drives the compressor (also known as the supercharger), which pressurises the intake airflow (or other fluid). I'm not sure there's a reason why you couldn't have an oil driven turbine, although given the viscosity of oil, it's probably a bit overkill, although I don't know much about them. An oil driven pump or motor would suffice I would think.
Super Slo Mo said:
ell yes, but no. The engine could drive an oil powered motor rather than a turbine, which would drive a compressor directly. Personally I think harnessing all that waste energy in the exhaust gases is far better.
true enough, but back in those days, turbo tech was nothing like as good as it is now, lag was a huge problem, these days, it's nothing like that bad and engine design + ECU improvements have just about masked it.Makes for neat packaging : oil pump nice and low on the motor, blowers at the carbs.
With a variable displacement pump, you get full boost from low revs : that plus the efficiency of a centrifugal compressor was probably as good as a roots type supercharger or a turbo of the day, but a lot more complex.
If they wanted to, they could have varied the boost based on throttle position and/or revs - I wonder if they did?
With a variable displacement pump, you get full boost from low revs : that plus the efficiency of a centrifugal compressor was probably as good as a roots type supercharger or a turbo of the day, but a lot more complex.
If they wanted to, they could have varied the boost based on throttle position and/or revs - I wonder if they did?
Gypsum Fantastic said:
dayman0 said:
A mate got in my Fiesta ST the other day and after a bit of semi-spirited driving (enough to hear the 4 pot powaaaa) he asked me if it was a diesel. Now I'm sad.
An ex-girlfriend asked me once if my old Evo IX FQ-340 was a diesel. I think that's the default question non-petrol heads ask about anything.When I had my '00 Impreza turbo, this lad was eyeing the bonnet scoop and asked; "Is that the diesel mate?"
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