Some info on E5 fuel.
- Thread starter funnyclub
- Start date
R
Renno555
Guest
Oh yeah sorry, only thing is you could argue is that most stations hadent got E5 in Sept. I think the date on that test said sept ? Its unlikely there 95ron was 97 though. And the chances that the test was done just as the tanks where switching from 95 - 99.2 ron is a long shot.
Damo
Damo
[quote author=Renno link=topic=5696.msg66163#msg66163 date=1204282692]
Oh yeah sorry, only thing is you could argue is that most stations hadent got E5 in Sept. I think the date on that test said sept ? Its unlikely there 95ron was 97 though. And the chances that the test was done just as the tanks where switching from 95 - 99.2 ron is a long shot.
Damo
[/quote]
thats was carried out in dunore road, dogheda where the lads filled up before the rolling road that time, they actually carried e5 unadvertised as a test for 6 months before offical date of release so they had it from march 06
Oh yeah sorry, only thing is you could argue is that most stations hadent got E5 in Sept. I think the date on that test said sept ? Its unlikely there 95ron was 97 though. And the chances that the test was done just as the tanks where switching from 95 - 99.2 ron is a long shot.
Damo
[/quote]
thats was carried out in dunore road, dogheda where the lads filled up before the rolling road that time, they actually carried e5 unadvertised as a test for 6 months before offical date of release so they had it from march 06
R
Renno555
Guest
[quote author=Dagnut link=topic=5696.msg66171#msg66171 date=1204285069]
[quote author=Renno link=topic=5696.msg66163#msg66163 date=1204282692]
Oh yeah sorry, only thing is you could argue is that most stations hadent got E5 in Sept. I think the date on that test said sept ? Its unlikely there 95ron was 97 though. And the chances that the test was done just as the tanks where switching from 95 - 99.2 ron is a long shot.
Damo
[/quote]
thats was carried out in dunore road, dogheda where the lads filled up before the rolling road that time, they actually carried e5 unadvertised as a test for 6 months before offical date of release so they had it from march 06
[/quote]
Ah right fair enough.
Damo
[quote author=Renno link=topic=5696.msg66163#msg66163 date=1204282692]
Oh yeah sorry, only thing is you could argue is that most stations hadent got E5 in Sept. I think the date on that test said sept ? Its unlikely there 95ron was 97 though. And the chances that the test was done just as the tanks where switching from 95 - 99.2 ron is a long shot.
Damo
[/quote]
thats was carried out in dunore road, dogheda where the lads filled up before the rolling road that time, they actually carried e5 unadvertised as a test for 6 months before offical date of release so they had it from march 06
[/quote]
Ah right fair enough.
Damo
F
forester sti
Guest
Is ther any other aspect of petrol that would have an effect it's ablity for timing advance other than octane???
Dan
Dan
[quote author=forester sti link=topic=5696.msg66368#msg66368 date=1204327819]
Is ther any other aspect of petrol that would have an effect it's ablity for timing advance other than octane???
Dan
[/quote]
not really dan from what i read ...RON is actually measured from the point of knock by advancing timing on the engine..so i dont know how they do the calculation or the formulae involved but basically they add timing until they get knock.
so lets say the use petrol A and they get 11 degrees timing(totally hypothetically) and its say 95 ROn so they advance timing on petrol B and get13 degrees its 98.. or whatever forget about the figures there totally made up..but thats my understanding of the process.
RON is not a measure of the purity of the petrol or the elements in it...anything used as a fuel can have a octane value .its a measure of how resistant it is to knock
Is ther any other aspect of petrol that would have an effect it's ablity for timing advance other than octane???
Dan
[/quote]
not really dan from what i read ...RON is actually measured from the point of knock by advancing timing on the engine..so i dont know how they do the calculation or the formulae involved but basically they add timing until they get knock.
so lets say the use petrol A and they get 11 degrees timing(totally hypothetically) and its say 95 ROn so they advance timing on petrol B and get13 degrees its 98.. or whatever forget about the figures there totally made up..but thats my understanding of the process.
RON is not a measure of the purity of the petrol or the elements in it...anything used as a fuel can have a octane value .its a measure of how resistant it is to knock
F
forester sti
Guest
And knock is?????????????????????????????????
Compresion ignition ??????????
Dan
Compresion ignition ??????????
Dan
keith dublin
Member Number 161Full ISDC Members 2015
Knocking (also called detonation or spark knock, pinking in UK English or pinging in US English) in a spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder starts off correctly in response to ignition by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front. The fuel-air charge is meant to be ignited by the spark plug only, and at a precise time in the piston's stroke cycle. When spark knock occurs, two or more combustion fronts will exist and their collisions produce a sudden rise in cylinder pressure, and a shock-wave which will reverberate around the cylinder[1]. The peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle. The shock wave creates the characteristic metallic "pinging" sound, and cylinder pressure increases catastrophically. Spark knock can range from inconsequential to completely destructive.
Pinking (or pinging) and detonation are 2 different things. Pinking is when the timing is so advanced, compression ratio too high, or the mixture self ignites in the cylinder, due to heat, that the fuel mixture fire's far too early, and the sound is mdae by a massive loading on the crank-pin.
Detonation on the other hand is when the mixture is ignited in 2 differnet regions on the combustion chamber, and the flame front's collide,
As for measureing RON, as it cannot be calculated correctly, this is how it's done.
The fuel is tested on an engine that runs at 600 rpm and inlet temp's of 65.6 C, until knock is detected. Then a mixture of iso-octane and n-heptane is run at the same compression ratio, in different mixture's until the same knock is detected.
For example 95 RON is equal in knock reistance to a mixture on 95% iso-octane and 5% n-heptane.
The MON number is calculated at higher speeds (900 rpm) and greater inlet temp's (148.9 C) and is usually between 6 and 12 points less than RON. This is more important than RON for high revving engine's or turbo/super charged engine's.
John
Detonation on the other hand is when the mixture is ignited in 2 differnet regions on the combustion chamber, and the flame front's collide,
As for measureing RON, as it cannot be calculated correctly, this is how it's done.
The fuel is tested on an engine that runs at 600 rpm and inlet temp's of 65.6 C, until knock is detected. Then a mixture of iso-octane and n-heptane is run at the same compression ratio, in different mixture's until the same knock is detected.
For example 95 RON is equal in knock reistance to a mixture on 95% iso-octane and 5% n-heptane.
The MON number is calculated at higher speeds (900 rpm) and greater inlet temp's (148.9 C) and is usually between 6 and 12 points less than RON. This is more important than RON for high revving engine's or turbo/super charged engine's.
John