Unleaded vs Premium Options

[Neal]

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]

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