Toymods Car Club Inc: General Car Talk => Higher RON Fuels: Did you know?

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Matt-itude
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Location:
Perth, Western Australia
Registered:
October 2004

Re: Higher RON Fuels: Did you know?

Sun, 12 June 2005 18:40

river wrote on Sun, 12 June 2005 19:07

Hi,

The first paragraph above you admit to high RON increasing the thermal efficiency and increase the overall torque and power in a high compression engine. Yet, in your next paragraph you say there is no improvement in performance. Confused

My engine is a high compression, and it performs much better on Ultimate than it does with Premium, and it just doesn't like standard ULP at all.

Matt-itude wrote on Sun, 12 June 2005 19:11

The advantage to using a high RON fuel comes in with it having a higher flash point, or a resistance to detonation. This means engines can be run with a higher compression ratios, and can advance the timing to the limit of detonation, and produce much higher peak pressures and temperatures in the combustion chamber which will increase the thermal efficiency, and therefore increase overall torque and poer, compared to regular unleaded.

I think you have misread what i have written.

Higher RON Fuels give an engine the capacity to achieve higher power output by increasing peak pressure and temperature inside the combustion chamber, which increases thermal efficiency.

I.E. More energy from the fuel is converted into engine power.

My point was, higher octane fuels don't have anymore "potential energy" than lower octane fuels, but they let engines run with higher compression ratio's and more advanced timing, before the onset of detonation, which creates more power and better performance as per the reasons above.

River - This is probably why your engine runs much better on 98 RON fuel, as the engine would be tuned for it, and running on lower octane fuel would most likely cause detonation, or pinging, which is certainly not good for power or the lifespan of your engine.

If your car runs perfectly fine with no detonation on 91 RON, then putting a tank full of higher octane fuel will not do anything for performance. IF NO OTHER MODIFICATIONS ARE DONE

So i stand by my statement:

Matt-itude wrote on Sun, 12 June 2005 19:11

Better performance from BP ultimate? All things staying the same, i don't think so.

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