I heard that the 98 octane gas that we get on the pumps across europe,should be equal to 95 octane that you US guys have!So is this true?I was told that it is so because some differences in standards.

This is interesting to me,because i've read on the board that 400WHP is the limit for a 4 cylinder car on pump gas.So i figured that if we have "better" fuel in europe we may push the limit a bit higher.

Someone help!pls

 

Come on,some of you should know this.

TTT

 

i dont know, here in cali on the pumps is tells me 91 but its ok for me i use 87

 

My thought is that if you push 400WHP with 91octane,than i should be able to make at least 450 whit out detonating,with the98 octane.

More help needed!

 

in all reality- TUNINIG is the key. You could have 400 octane, not tune your car, and have it detonate if things aren't right. I've seen people tune 13:1 on 91 octane and yet others will swear it can't be done.

 

TTT

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wicked2night &raquo;</TD></TR><TR><TD CLASS="quote">I heard that the 98 octane gas that we get on the pumps across europe,should be equal to 95 octane that you US guys have!So is this true?I was told that it is so because some differences in standards...</TD></TR></TABLE>
There's different ways to measure octane of a fuel. Can you find out what yours is called? The results vary A LOT.

Here in USA the posted octane #s are the average of 'Motor Octane Number' & 'Research Octane Number'. The sticker on the pump says something like "R+M/2".

Even if you know, probably I can't answer your real question. Namely, if you take your gasoline & test it according to USA tests, what octane number would it be?? Someplace like ASTM or SAE probably could explain the different test procedures, but that wouldn't tell you the result.

 

Thanks!

Still loking for smart people

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wicked2night &raquo;</TD></TR><TR><TD CLASS="quote">Still loking for smart people </TD></TR></TABLE>
Not good enough, huh?

I looked up some stuff in my engines textbook, which is about 30 years old. So this stuff is probably outdated, but just so you get the idea...

Research octane F-1 (RON) is tested by ASTM D2699, in an ASTM-CFR test engine, at 600rpm, 212F coolant temperature, 100F manifold temperature, spark at 13deg BTDC. Adjust the compression ratio of the engine until the spark knocking as at a standard level as measured with a particular kind of magnetostrictive transducer. Then with the same compression ratio, blend 2 primary reference fuels to get the same knock. Isooctane (2,2,4-trimethyl pentane) is defined as 100 octane and heptane is defined as zero. The percentage of isooctane that gives the same knock measurement is the octane #.

Motor octane F-2 (MON) is tested by ASTM D2700. 900rpm, different manifold temperature, different spark timing, and the 'standard knock' is a different level. There's several different procedures under the 'research' & several more under 'motor' octanes. Then there's 'aviation' octane & several others. The same gasoline might measure different by as much as 10 or 15 octane #s with different procedures.

So a particular gasoline might measure 93 under F-1 & 81 under F-2. The average of 87 is posted on USA pumps. Some gasoline blends are very sensitive - they give different results depending on which procedure is used.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wicked2night &raquo;</TD></TR><TR><TD CLASS="quote">Still loking for smart people </TD></TR></TABLE>

I'm confused by that statement... sorry if you didn't like the answers you were given, but we here in the states can only speak of what we know. My answer was dead on as were all the others you've recieved so far. There isn't going to be just one simple statement that you'll want to hear.