Browse Publications Technical Papers 2005-01-2081
2005-05-11

A Further Study of Inconsistencies between Autoignition and Knock Intensity in the CFR Octane Rating Engine 2005-01-2081

Careful consideration of the development and operation of the ASTM knock detection system on the Cooperative Fuels Research (CFR) octane rating engine has shown that the pressure fluctuations, brought about by autoignition of the end-gas, do not contribute to measurement of knock intensity. The analyses of a variety of fuels at standard knock intensity revealed that knock intensity measured on the CFR engine is related to the rate of change of pressure prior to knocking and is consistent with the description and operation of, not only the original bouncing pin, but also the modern day electronic CFR knock measurement system. It was concluded that the use of octane number data to directly infer information about the autoignition behaviour of fuels should be done with caution.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

DETONATION RATING OF AVIATION FUELS

330054

View Details

TECHNICAL PAPER

Insights into the Role of Autoignition during Octane Rating

2007-01-0008

View Details

TECHNICAL PAPER

Fuel Blend and Mixture Strength Effects on Autoignition Heat Release Rates and Knock Intensity in S.I. Engines

962105

View Details

X