Regular or Super Unleaded? What do you use and what car?
Discussion
Sorry to be the bearer of bad news, but the V12V doesnt have a knock sensor so the engine is fixed tuned for std 95 octane unleadded, so there is very little benefit in going for super.
One of the reasons the V12VS has an additional 55bhp was the introduction of this feature.
So dont waste you cash on super, as you wont see many of the usual benefits.
One of the reasons the V12VS has an additional 55bhp was the introduction of this feature.
So dont waste you cash on super, as you wont see many of the usual benefits.
The V8 is an entirely different situation and does benefit from Super in the same way most engines do, but AstonExige has bought a V12V. Read the BR sticky thread - at some point about 4yrs ago Mike was kind enough to enlighten us about the lack of knock sensor on the older (<=510bhp) V12 engine.
developer said:
What do AM say (via the manual perhaps)?
My manual says 98 RON only, with a paragraph about potential engine damage if not used.
E63S AMG.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...My manual says 98 RON only, with a paragraph about potential engine damage if not used.
E63S AMG.
AdamV12V said:
Thanks - though I didn't read it all - what I'm suggesting is that there should be manufacturer's advice tucked away somewhere.developer said:
Thanks - though I didn't read it all - what I'm suggesting is that there should be manufacturer's advice tucked away somewhere.
more info here : http://www.pistonheads.com/gassing/topic.asp?t=144...Edited by AdamV12V on Sunday 18th December 23:15
Here is from the 2009 Aston Martin Vantage Manual
Engine
All alloy, quad overhead cam 32 valve V8.
Four knock sensors - two per cylinder head.
Variable inlet camshaft timing
Fuel Recommended
Premium Unleaded Gasoline 93 Octane (R+M)/2 for optimum performance 91 Octane (R+M)/2
Premium Unleaded Gasoline minimum
Engine
All alloy, quad overhead cam 32 valve V8.
Four knock sensors - two per cylinder head.
Variable inlet camshaft timing
Fuel Recommended
Premium Unleaded Gasoline 93 Octane (R+M)/2 for optimum performance 91 Octane (R+M)/2
Premium Unleaded Gasoline minimum
Handyman2009 said:
Here is from the 2009 Aston Martin Vantage Manual
Engine
All alloy, quad overhead cam 32 valve V8.
Four knock sensors - two per cylinder head.
Variable inlet camshaft timing
Fuel Recommended
Premium Unleaded Gasoline 93 Octane (R+M)/2 for optimum performance 91 Octane (R+M)/2
Premium Unleaded Gasoline minimum
The OP has a V12V so this thread is about the fuel to ne used in the V12 engine, not the V8, whoch as I've stated above already does have a knock sensor.Engine
All alloy, quad overhead cam 32 valve V8.
Four knock sensors - two per cylinder head.
Variable inlet camshaft timing
Fuel Recommended
Premium Unleaded Gasoline 93 Octane (R+M)/2 for optimum performance 91 Octane (R+M)/2
Premium Unleaded Gasoline minimum
Besides that, this is a quote from a North America market manual, the engines for which are tuned for the lower grade fuels available there compared to the European market engines.
Just want to know more about the lack of knock sensors on the DB9/DBS/V12V V12.
Does anyone know why these engines don't have knock sensors?
Inside the internal combustion engine a knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four stock cycle, the knock sensors pick up on the vibrations of this and the ECU adjusts the ignition timing to suit, in extreme cases knock can destruct an engine.
So the V12 hasn't got knock detection, doesn't sound very good, I assume when the engine was developed the engineers knew what they were doing, just doesn't seem a good idea to have a high power V12 without these sensors.
Does anyone know why these engines don't have knock sensors?
Inside the internal combustion engine a knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four stock cycle, the knock sensors pick up on the vibrations of this and the ECU adjusts the ignition timing to suit, in extreme cases knock can destruct an engine.
So the V12 hasn't got knock detection, doesn't sound very good, I assume when the engine was developed the engineers knew what they were doing, just doesn't seem a good idea to have a high power V12 without these sensors.
paulrog1 said:
Just want to know more about the lack of knock sensors on the DB9/DBS/V12V V12.
Does anyone know why these engines don't have knock sensors?
Inside the internal combustion engine a knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four stock cycle, the knock sensors pick up on the vibrations of this and the ECU adjusts the ignition timing to suit, in extreme cases knock can destruct an engine.
So the V12 hasn't got knock detection, doesn't sound very good, I assume when the engine was developed the engineers knew what they were doing, just doesn't seem a good idea to have a high power V12 without these sensors.
I'm also curious why not having a knock sensor means there is no point using super. I thought the knock sensor was generally detecting 'knock' when lower octane fuel was used and it retards the ignition to compensate. Not having a knock sensor would simply mean it couldn't detect that as opposed to meaning there is no benefit to using super. Or is the argument that the engine is meant to run on 95 hence it doesn't need to compensate (and hence the timing is not advanced to benefit from super).Does anyone know why these engines don't have knock sensors?
Inside the internal combustion engine a knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four stock cycle, the knock sensors pick up on the vibrations of this and the ECU adjusts the ignition timing to suit, in extreme cases knock can destruct an engine.
So the V12 hasn't got knock detection, doesn't sound very good, I assume when the engine was developed the engineers knew what they were doing, just doesn't seem a good idea to have a high power V12 without these sensors.
Or have I completely misunderstood what knock sensors do?
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