fuel additives

[SunlitComet]

Never heard that theory before.

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[chip]

If I'm not mistaken, I heard that from the Professor that designed the engine in the Dodge Neon.

 

[napp e roots]

the method of moving the decimal is not an accurate calculation by any means. Most cars are around 9.0-10.5 meaning all cars would run on premium gas which is not true. the new toyota prius has a compression ratio of 13:1 so that would mean it would run on 130 octane? my cobra has a CR of 98.5:1 so i would need 98 octane which isnt happening. it may work out as a coincidence in some situations.

 

[ezdaar]

there's more to just compression to determine octane rating you need.
You can run 9.0 comp and run 87 on the correct tune and not knock in say 70* air temps all the way from idle to WOT.
But try the same run in 104* air and you will be knockin bad.
Combine that with emgine heatsoak, poor plugs, leaky valve seals, carbon build up on pistons and valves etc etc.. and you can clearly see, its ALWAYS better to runthe best fuel you can to avoid potential problems..

If you look at the cost diff between 87 and 93 fuel Over a year VS a new engine..
Im sorry but only 93 will EVER go in my vehicals..

 

[chip]

the method of moving the decimal is not an accurate calculation by any means. Most cars are around 9.0-10.5 meaning all cars would run on premium gas which is not true. the new toyota prius has a compression ratio of 13:1 so that would mean it would run on 130 octane? my cobra has a CR of 98.5:1 so i would need 98 octane which isnt happening. it may work out as a coincidence in some situations.

It's accurate under optimal tune (See below).

there's more to just compression to determine octane rating you need.
You can run 9.0 comp and run 87 on the correct tune and not knock in say 70* air temps all the way from idle to WOT.
But try the same run in 104* air and you will be knockin bad.
Combine that with emgine heatsoak, poor plugs, leaky valve seals, carbon build up on pistons and valves etc etc.. and you can clearly see, its ALWAYS better to runthe best fuel you can to avoid potential problems..

If you look at the cost diff between 87 and 93 fuel Over a year VS a new engine..
Im sorry but only 93 will EVER go in my vehicals..

+1 ........Thanks!! I really didn't feel like typing all that.