XPost: misc.phone.mobile.iphone, comp.mobile.android
From: nospam@nospam.invalid
In article
, Paul M.
Cook wrote:
>
> > again, that depends on the engine.
>
> Actually, the fuel was *designed* into the engine, but, a lot depends on
> the current timing of the spark advance, whether the knock sensors
> are working, whether the EGR is working to cool the combustion
> chamber, whether the cooling system is working to cool the cylinder
> walls, whether the variable valve timing is working (e.g., VANOS
> in bimmers), etc.
in other words, it depends on the engine, just like i said.
> > some engines adjust timing depending on the fuel and others don't.
>
> Actually they don't.
yes they do.
> My bimmer has two piezoelectric knock sensors mounted on the engine
> which detect knocking, and, if they detect knocking, this tells the
> Siemens DME to retard the timing.
in other words, they do, just like i said.
> > for the former, there can be a performance improvement with higher
> > octane fuel. for the latter, it's mostly a waste.
>
> You can't get a performance improvement with higher octane rated
> fuel *unless* you were knocking in the first place.
in other words, you can get an improvement, just like i said.
> > maybe you drive shitboxes that fall into the latter category but not
> > everyone does.
>
> I have a bimmer and a beemer.
> The bimmer has two piezoelecric knock sensors mounted on the passenger
> side of the M54 engine block. The beemer does *not* have knock sensors,
> and, while it's water cooled, it still runs hotter, so, it's prone
> to knocking on the wrong fuel for the conditions.
in other words, getting a higher octane fuel is not a waste, just like
i said.
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