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> Unleaded vs Premium
Neal
post Sep 8 2003, 01:24 PM
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I wanted to know for a engine developed in the 70's and rebuilt in the 2000's do you think 4 octane points higher makes a difference on how the engine performs as a daily driver ?

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redshift
post Sep 8 2003, 01:27 PM
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Yep! 2.0s hate premium, runs cold.


M
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aufaber
post Sep 8 2003, 02:24 PM
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OH! That poor F4i! (IMG:style_emoticons/default/ohmy.gif)

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tat2dphreak
post Sep 8 2003, 02:28 PM
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QUOTE(redshift @ Sep 8 2003, 02:27 PM)
Yep! 2.0s hate premium, runs cold.


M

is that true for 1.7/1.8L also?
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redshift
post Sep 8 2003, 02:45 PM
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I don't remember the 1.8 not liking it.

Injected 2.0s and 1.7s I have had hate it. If it's hot outside, they flutter at idle, almost like an overheat, and the idle drops 300 or so, and can cause all kinds of shit warm starting.

We have some of the best quality gas you can buy in the states here, you have even better maybe.

Dense winter air is another story, make you wish you had 104 octane, and 4' velocity stacks.

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Neal
post Sep 8 2003, 02:52 PM
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My car has webers and I live in Seattle, would premium help ?, it's a 2.0 with euro pistons and a mild factory cam.
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redshift
post Sep 8 2003, 03:03 PM
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I don't know.

Washington has boutique fuels, like California?

Test out only a half a tank, or even less, won't hurt you, with carbs, and somewhat milder weather than us poor folks in the killing zone.


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ChrisReale
post Sep 8 2003, 03:14 PM
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Premium is the expensive shit, right? Thats all I put in mine....
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tat2dphreak
post Sep 8 2003, 03:42 PM
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I used premium in my carbbed 1.7... and I wonder if that's one of the many reasons it didn't idle smooth...
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p914
post Sep 8 2003, 04:10 PM
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QUOTE(redshift @ Sep 8 2003, 11:27 AM)
Yep! 2.0s hate premium, runs cold.


M

Why is it that 2.0s don't like premium? It ignites at a lower temp.
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p914
post Sep 8 2003, 04:12 PM
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QUOTE(redshift @ Sep 8 2003, 01:03 PM)
I don't know.

Washington has boutique fuels, like California?

Test out only a half a tank, or even less, won't hurt you, with carbs, and somewhat milder weather than us poor folks in the killing zone.


(IMG:style_emoticons/default/happy11.gif)(IMG:style_emoticons/default/smash.gif) i hate heat



M

WA state has good gas and is regulated. Oregon gas is questionable depending on the station.
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aufaber
post Sep 8 2003, 04:34 PM
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QUOTE(p914 @ Sep 8 2003, 02:10 PM)
QUOTE(redshift @ Sep 8 2003, 11:27 AM)
Yep! 2.0s hate premium, runs cold.


M

Why is it that 2.0s don't like premium? It ignites at a lower temp.

Octane is a rating of resitance to ignition.

http://auto.howstuffworks.com/question90.htm

The higher the octane the harder to ignite.

-Aaron G.
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redshift
post Sep 8 2003, 04:44 PM
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QUOTE(p914 @ Sep 8 2003, 06:10 PM)
QUOTE(redshift @ Sep 8 2003, 11:27 AM)
Yep! 2.0s hate premium, runs cold.


M

Why is it that 2.0s don't like premium? It ignites at a lower temp.

Our engines are as hot as fire.

Another thing, you are tossing money away if your local fuel is good, and you are fueling with a higher octane fuel, and I am telling you, it's not a good thing, and you can feel the difference in 87-91-93, nice, flutter, flap like a bird.

Early 1.7 used high test though, did they not?

It's not just something you decide to do one day, engineers worked at all this, they spec the rating in the build, just like cam duration, and valve clearance.

You can change octane, I don't know what the environmental changes to the equation, but your plugs must be in another temp range than stock, and gapped different.

There you go, that is what the difference feels like, bad gap, and that is how you take it up, bad gap.



M
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p914
post Sep 8 2003, 04:47 PM
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QUOTE(redshift @ Sep 8 2003, 02:44 PM)
QUOTE(p914 @ Sep 8 2003, 06:10 PM)
QUOTE(redshift @ Sep 8 2003, 11:27 AM)
Yep! 2.0s hate premium, runs cold.


M

Why is it that 2.0s don't like premium? It ignites at a lower temp.

Our engines are as hot as fire.




M

I use a colder plug because I have electronic ignition and the gap is .038. A little wider than normal.
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Andyrew
post Sep 8 2003, 04:53 PM
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Redshift, your saying use the cheepo stuff?

Andrew
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redshift
post Sep 8 2003, 05:04 PM
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Look in your owners manual.

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And with that, I go nappy.


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Andyrew
post Sep 8 2003, 05:43 PM
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Hehe, I have about 5 workshop manuals, but not the factory owners, keeping my eye on ebay for a nice one cheap..

Andrew
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redshift
post Sep 8 2003, 05:49 PM
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and I can't sleep so...


1.7 (early) 98 RON

1.7 (late) 91 RON

2.0 91 RON

be right back..


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redshift
post Sep 8 2003, 05:52 PM
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Googlectomy! There is the whole thing in a page. -whew- (popups crap!) Hold on..

http://www.azcentral.com/arizonarepublic/w...els28click.html


M
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Bleyseng
post Sep 8 2003, 06:05 PM
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Hmm, thats not what I have read before. DD posted a bunch of stuff before of how the ratings are different and how to translate them for todays fuel. I have used regular and hitest in my 2056 engine. Seems to like the good stuff much better, runs smoother.

Geoff
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