Agreed, higher octane also resists ignition due to compression. If the reason
for pinging was high compression there isn't much the computer can do about it.
I suppose that in a forced induction engine it could open the waste gate to
reduce boost or if it was a VNT turbo just make less boost in
> Accurate or BS?
Well yes and no. Here is some of what I learned by
reading the Bosch Automotive Technology handbook.
> What is the difference between higher octane
and lower octane?
> Well, 87 octane will ignite at a lower
pressure than 93 octane.
Here he is wrong. We all know from
I would base it on the compression ratio of the engine. Yes knock sensor will
retard the spark but at some point if it's a high compression engine you will
get detonation with lower octane fuel. Why not run 85 or 82 if it's such a good
idea?
On Fri, Sep 29, 2023, at 17:26, Bob Rentfro via
I run 87 in my m112 and I can’t tell any difference in power or mileage
Sent from my iPhone
> On Sep 29, 2023, at 5:27 PM, Bob Rentfro via Mercedes
> wrote:
>
> A car guy friend posted this about knock sensors and octane #s. Will this
> make us all run out and burn 87 in our 91 only cars?
A car guy friend posted this about knock sensors and octane #s. Will this make
us all run out and burn 87 in our 91 only cars?
“Short story on knock sensors: All modern cars have them. And because of knock
sensors, you can run 87 octane in a vehicle that says you have to run premium*.
Long
