Today union minister Nitin Gadkari signed the file granting legal recognition to 100% ethanol fuel engine.
Blend
E10/E20 - most modern car after 2023 built to E20 spec
But older car will run on material stress & mileage loss.
E85 - Flex fuel vechicle only, 85% ethanol need ethanol sensor recalibrated ECU, cortisone resistance parts.
E100 Flex dedicated ethanol vechicle only.
Will Car Engines fail when we use E20 or above?
1. Corrosion - Ethanol attacks aluminium, brass, zinc and untreated steel. ORNL immersion data shows corrosion rising steadily with ethanol concentration.
2. Water absorption - hygroscopic it pulls moisture from air which pool near tank with it’s corrosivity accelerate wear on fuel system parts
3. Elastomer attack - it swells & degrades nitrile rubber, natural rubber, PVC, urethane seals & hoses of older fuel system
4. Cold start - E100 cold start will be very challenging
Ethanol blend gasoline Mileage loss compare to petrol
E10. -2%
E20. -5%
E85. -28%
E100-33%
Key property Petrol. Ethanol
Energy density. 32. 21
Octane. 91-95. 108-109
Latent Heat. 350. 900
Water affinity. Low. Very high