RON rating in hot weather
08 August 2003, 12:15 PM
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Read somethign yesterday that made me think loss of performance in this 'heatwave' wasnt down to higher induction temperatures. Apparently above 30-35c petrol expands and therefore the injectors will be squirting less rons into the engine???
08 August 2003, 12:17 PM
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Less RONS in a given amount of fuel I meant to say. IE If you have 1 cubic metre of petrol at say 100 ron, when this expands to 1.1 cubic metre you have the same amount of RONS but theres 'more' fuel - your injectors can only squirt in so much at a time(550, 650cc).
Am I talking cr@p or not?
Am I talking cr@p or not?
08 August 2003, 01:19 PM
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RON has nothing to do with "power", calorific value does and the 2 are quite different.
RON is purely knock resistance. You can have crap fuel power wise that has a very high RON.
Hot weather creates higher intake temps which means less oxygen to burn which means less power.
The later cars also seem to compensate ECU timing and/or boost depending on intake temps. It's a good idea actually as most detonation will occur after heatsoaking your intercooler and then do a traffic gp. So the compensation is there to make your engine safer.
RON is purely knock resistance. You can have crap fuel power wise that has a very high RON.
Hot weather creates higher intake temps which means less oxygen to burn which means less power.
The later cars also seem to compensate ECU timing and/or boost depending on intake temps. It's a good idea actually as most detonation will occur after heatsoaking your intercooler and then do a traffic gp. So the compensation is there to make your engine safer.
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