To rate a fuel, the engine is set to an appropriate compression ratio that will produce a knock of about 50 on the knockmeter for the sample when the air-fuel ratio is adjusted on the carburettor bowl to obtain maximum knock.
Normal heptane and iso-octane are known as primary reference fuels.
Two blends of these are made, one that is one octane number above the expected rating, and another that is one octane number below the expected rating.
These are placed in different bowls, and are also rated with each air-fuelratio being adjusted for maximum knock.
The higher octane reference fuel should produce a reading around 30-40, and the lower reference fuel shouldproduce a reading of 60-70.
The sample is again tested, and if it does not fit between the reference fuels, further reference fuels are prepared, and the engine readjusted to obtain the required knock.
The actual fuel rating is interpolated from the knockmeter readings.
thanks for inputs
ReplyDeleteGET OUT OF FINANCIAL MESS WITH THE HELP OF drbenjaminfinance@gmail.com
ReplyDeleteI have been in financial mess for the past months, I’m a single mum with kids to look after. My name is REBECCA MICHAELSON, and am from Ridley Park, Pennsylvania. A couple of weeks ago My friend visited me and along our discussion she told me about DR BENJAMIN OWEN FINANCE of (drbenjaminfinance@gmail.com); that he can help me out of my financial situation, I never believed cause I have spend so much money on different loan lenders who did nothing other than running away with my money. She advised, I gave it a try because she and some of her colleagues were rescued too by this Godsent lender with loans to revive their dying businesses and paying off bills. so I mailed him and explain all about my financial situation and therefore took me through the loan process which was very brief and easy. After that my loan application worth $278,000.00USD was granted, all i did was to follow the processing and be cooperative and today I am a proud business owner sharing the testimony of God-sent Lender. You can as well reach him through the Company WhatsApp +19292227023 Email drbenjaminfinance@gmail.com