Browse Publications Technical Papers 770191
1977-02-01

Selecting Compression Ratio for Optimum Fuel Economy with Emission Constraints 770191

An experimental program is described for selecting engine compression ratio to optimize vehicle fuel economy, with imposed emission constraints. A method was developed to relate quantitatively the results of single cylinder engine experiments to vehicle emission test results. Engine and vehicle experiments were conducted to validate the method. This study concludes that compression ratio optimization is determined primarily by hydrocarbon emission restrictions. Projections for a 1975 400 CID engine in a 5000 lb vehicle demonstrate that the traditional relationship between fuel economy and compression ratio is reversed below CVS-CH HC levels in the range of 1.0 - 1.5 gm/mile.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% 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

Ozone Precursor Emissions from Alternatively Fueled Vehicles

941905

View Details

TECHNICAL PAPER

Effects of Gasoline and Gasoline Detergents on Combustion Chamber Deposit Formation

941893

View Details

TECHNICAL PAPER

Exhaust Emissions in Cold Ambient Conditions:Considerations for a European Test Procedure

950929

View Details

X