Would You Run 100 Octane Gasoline in YOUR Benz? - Page 2 - Mercedes-Benz Forum

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post #11 of 20 (permalink) Old 08-26-2016, 02:29 AM
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Cars ran fine before knock sensors. I have a 68 Boss 302 R Code that is quite happy. That 5.0 liter (302 ci) push rod V8 makes more HP per liter than my E500.

Knock sensors are a relatively new thing in the 120 years autos have had combustion engines.

It is auto engine science. Not rocket science. Did microphones exist before rockets/space age? Of course they did. A knock sensor is a microphone.
This should help you understand them.

I favor the new PVDF knock sensors. Much better at working with low SNI and KI. The are simpler and do not require a CA.
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post #12 of 20 (permalink) Old 08-26-2016, 08:53 AM
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No, they did not run fine.
How many pre-sensor engines last 200,000 miles without major engine work?
Now instead of putting new plugs every 30k, we can do it every 100k and as indicated on our purchase, they do fine for over 150k.
Ask me how many times driving Fiat on 96 octanes I had to back off the gas pedal due the pinging.
Another interesting point - Fiat 126 had compression ratio that would indicate lower octane gasoline, yet was required to run on Premium, because with 21HP under the hood, the gas pedal had 2 usable positions and with engine in the rear the driver did not hear pinging.


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post #13 of 20 (permalink) Old 08-26-2016, 01:23 PM
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The cars ran fine in their era. However a microphone listening for specific wavelength and then sending a signal to the ECU is combustion technology, not rocket science. The Apollo rockets nor the space shuttles had knock sensors.

Putting a Fiat into this equation is messing with my head. My mom had a 124, and the fuel was never the reason that POS was never reliable. LOL
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post #14 of 20 (permalink) Old 08-26-2016, 02:32 PM
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Originally Posted by Noodles View Post
My mom had a 124, and the fuel was never the reason that POS was never reliable. LOL
How do you know that?
Fiat 124 and its twin LADA was used by Moscow Police for catching bad guys and consider one of the best of the era.
I think it was pictured on one of Bourne movies, where it killed G-Mercedes
Originally design for 96 octane.
Could running it on lower octane in US have bad results?

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post #15 of 20 (permalink) Old 08-27-2016, 01:20 AM
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My mom's was just a mechanical disaster. Fiat had a dealer network, none the techs were trained right.

I am very familiar with the LADA. Was in Poznan every year for the trade show every year until I was 22 years old. That was through 1984.
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post #16 of 20 (permalink) Old 08-27-2016, 02:01 AM Thread Starter
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The fix it again Tony demonstrates a good point in the Yugoslavian example.
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post #17 of 20 (permalink) Old 08-27-2016, 10:57 AM
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Indeed..Yugo had even even worse or totally non existent quality control.

Hard to believe that the handful that are left in very good shape are selling at more than they cost as "collectible"
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post #18 of 20 (permalink) Old 08-27-2016, 12:22 PM
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Yugo has good value as toad.
Being small and light - easy to pull behind motorhome, or carry on trailer.
We went long way from high octane gasoline, but again, I had several experiences and used higher than recommended octanes in some situation, what was great help for me.
Sure with cars having well over 200 hp, loosing few ponies is hard to notice.

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post #19 of 20 (permalink) Old 08-28-2016, 03:50 PM
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Octane ratings in the USA is RON (research octane number) Europe, and other areas use MON (motor octane number) which is about 6 points higher. Wikipedia can be your friend too.
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post #20 of 20 (permalink) Old 08-28-2016, 08:18 PM
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Actually in the USA, octane rating is Anti Knock Index, which is (RON + MON) / 2
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