The majority of cam phasing systems out there use a system like this... normally only difference is the number of vanes used 3 and 4 being the most popular.
AFAIK:
Alfa/FIAT has it called Variator in the twinspark engines
GM with their DCVCP
Honda uses it as the i in i-VTEC
Subaru AVCS
And I am pretty sure that Toyota has it as part of there VVT-i and VVTL-i systems
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
It share a lot of the dimensions and external points with the Duratec V6.
Yamaha woked with Ford on the V6 engine, so inevitabel that their will be "similarities"
The engine was originally dropped fron production in the 90s and Volvo resurrected it for the XC90 --- for some obscure reason
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'
intriguing. There's clearly a mechaism on the end of the camshaft which I suggest links the chain driven outer to the camshaft inner. Very interesting ... off to do some googling
"Now at 4.4 L, the V8 engine, made at Ford's Bridgend Engine Plant in Mid-Glamorgan in Great Britain, is unique in Ford's wide range of V8 engines in that it is designed for transverse use and has a V6-like 60° bank angle."
Last edited by Matra et Alpine; 07-04-2007 at 05:09 AM.
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'
aah..sounds likely. seems we owe a lot to the humble duratec then.
autozine.org
My turn for a question:
If you got the exhaust to flow at super sonic velocities through a relatively straight exhaust manifold....
What would happen when the super-sonic flow enters a turbocharger?
with the constricting area of the turbine scroll the flow will slow down and gain pressure but what happens when it suddenly slows down to trans-sonic and slower?
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
here's some light reading about the affect of supersonic air speed with turbos, we run a couple of race cars with 36mill inlet restrictors 50mm back from the turbine wheel. We have tried various types of restrictor shapes on the engine dyno and have made some gains with the restrictor shape. Any way heres the link , most of these guys have vast real world experience with turbos, has some handy information
http://www.techmasters.com.au/forum/...ght=supersonic
http://www.techmasters.com.au/forum/...ght=supersonic
http://www.techmasters.com.au/forum/...ght=supersonic
Last edited by charged; 07-09-2007 at 01:43 AM.
SA IPRA cars 15, 25, 51 & 77
Sharperto Racing IP Corollas
http://www.sharperto.com.au/
If you have back pressure at the turbo inlet the air flow will return to subsonic.
Just an aside but something to think about with supersonic airflow...
By definition anything that happens down stream of a supersonic flow CAN NOT affect the properties up stream of the flow. No sounds, shocks, pressure changes etc can flow upstream through a supersonic flow. Now enough back pressure can reduce the flow rate and return the flow to subsonic. Conversely with more upstream pressure I can make the flow move even faster with the help of a divergent nozzle.
One more thing, I don't think you can make exhaust flow supersonic without a convergent nozzle. Beyond that my memory of the subject matter is fuzzy.
What do you mean? which turbo inlet are you talking about? and I already know the velocity will return to trans-sonic/subsonic... My question was what happens if that happens inside the exhaust side of a turbocharger?
I already know that pressure waves cannot travel backwards against the flow if it is supersonic... What do you mean by "back pressure"? the flow will slow down if the cross sectional area of the flow is decreased... when the velocity decreases the pressure must increase... I also know about how a divergent nozzle can increase velocity (with increased pressure) I also know about de Laval nozzles...Originally Posted by culver
In order for a maintained supersonic velocity you would have to use a de Laval nozzle to achieve supersonic velocities... but you wont be able to get too fast as the pressure isn't very high or stable.Originally Posted by culver
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
Basically what I’m saying is if the turbo restricts exhaust flow then the pressure at the turbo inlet will increase. If that happens then the pressure difference across the manifold will drop and the flow will become subsonic.
If the flow was subsonic when it hit the turbo impeller then it doesn’t mater if it was supersonic beforehand, it is subsonic in the turbo housing.
A turbocharger is always going to restrict the flow somewhat and at supersonic velocities the flow will slow down just because of the decreasing crosssectional area of the turbine scroll.
My question is if you have a supersonic flow that changes to trans-sonic what happens?
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
Why do you want to make the flow supersonic for a short period to then slow it again to subsonic at the turbo?
How much energy will be taken in the speed change to supersonic that the turbo wont be able to use? Wont the pressure wave at the transonic boundary on the way to supersonic create more back pressure than the cylinders are ideal at?
Chief of Secret Police and CFO - Brotherhood of Jelly
No Mr. Craig, I expect you to die! On the inside. Of heartbreak. You emo bitch
This is not something I actually want to do I was simply thinking about what would happen and I wanted to know if anyone here knew...
Very little energy is used to achieve supersonic velocity in a flow. Basically pressure is traded for velocity. So you get supersonic but only at low pressure.
Also there is no ideal back pressure...
and any pressure created before the point where it is supersonic will only "fuel" the velocity...
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
Here's another question. In pesticides, how come they don't allow DDT but allow it for personal use in insect repellent? It makes no sense. If it's that bad as it is it should be banned altogether.
thats Deet.. a similr but very different chemical. DDT will kill you, Deet wil just repel bugs.
Honor. Courage. Commitment. Etcetera.
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