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post #1 of 37 (permalink) Old 07-31-2008, 07:32 AM Thread Starter
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Hemi - What Gas Grade

As a new Hemi owner I'm asking what grade gas does everyone put into their Hemi?

Here in the UK we have two grades 95 octane and 98 octane

I've been putting the 95 Octane in the tank...is this what should go in?

Cheers

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post #2 of 37 (permalink) Old 07-31-2008, 07:45 AM
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Quote:
Originally Posted by UK Commander
As a new Hemi owner I'm asking what grade gas does everyone put into their Hemi?

Here in the UK we have two grades 95 octane and 98 octane

I've been putting the 95 Octane in the tank...is this what should go in?

Cheers
I may be way off here, but I always put the lowest octane possible (that'd be 87 octane here). I was told that the hemi is really a truck engine and it would run too hot on higher octane fuel.

Anyone else with some insight feel free to correct me.


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post #3 of 37 (permalink) Old 07-31-2008, 07:59 AM
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The hemi requires the mid grade here which is 89 octane. Have you looked in your manual to see what the required octane is for over there?

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post #4 of 37 (permalink) Old 07-31-2008, 08:29 AM
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Quote:
Originally Posted by CrzCajun
The hemi requires the mid grade here which is 89 octane. Have you looked in your manual to see what the required octane is for over there?
Well I'll be danged.... I really should read this thing *pointing at owner's manual* more often.....


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post #5 of 37 (permalink) Old 07-31-2008, 09:24 AM Thread Starter
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Quote:
Originally Posted by Morgan
Well I'll be danged.... I really should read this thing *pointing at owner's manual* more often.....

I would read it, but its 75miles away at home, I'm in the office killing time and thought I'd ask my forum chums a question!!!!!

Who's reads the owners manual anyway???

Sorry for asking a question!!!

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post #6 of 37 (permalink) Old 07-31-2008, 10:00 AM
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you should be fine. isn't european gas octane different then USA gas grades. or am i missing something?

did you trade your CRD for the Hemi?
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post #7 of 37 (permalink) Old 07-31-2008, 10:01 AM
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don't you guys still have leaded gas as well? i thought i saw leaded gas when i was there from 98-2000. we accidentally put it in out car. P-reg. vauxall corsa.
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post #8 of 37 (permalink) Old 07-31-2008, 10:18 AM Thread Starter
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Quote:
Originally Posted by 4.7commander
you should be fine. isn't european gas octane different then USA gas grades. or am i missing something?

did you trade your CRD for the Hemi?

Chrysler UK did a swap with the CRD. It had cost them so much to replace the transmissions, they wanted it off the road!!!

We have unleaded here now and have done for many years now!!!

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post #9 of 37 (permalink) Old 07-31-2008, 10:20 AM
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I looked up the difference between US and European octane ratings, so we can compare apples to apples.

The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.

There is another type of octane rating, called Motor Octane Number (MON) or the aviation lean octane rating, which is a better measure of how the fuel behaves when under load. MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, a higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON. Normally fuel specifications require both a minimum RON and a minimum MON.

In most countries (including all of Europe and Australia) the "headline" octane rating, shown on the pump, is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, the octane shown in the United States is 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, is 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90-91 US (R+M)/2, and some even deliver 98 (RON) or 100 (RON).

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post #10 of 37 (permalink) Old 07-31-2008, 10:52 AM
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Wow! There you have it! Thanks Riddle!!!

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