1993-10-01

Hot-Start Driveability of Low T 50 Fuels 932672

A two-phase test program designed to investigate the effects of Reid vapor pressure, T50, and oxygenates on hot-start and driveability performance of vehicles operated at high and low altitude in high and intermediate ambient temperature ranges was conducted during July and August of 1992. Twenty 1983 - 1992 model-year vehicles were tested on a set of eighteen fuels which included six hydrocarbon-only fuels, six gasoline-ethanol blends, and six gasoline-MTBE blends. Fuel-injected vehicles showed very few demerits and were insensitive, in most cases, to the fuel variables studied. By comparison, carbureted vehicle's demerit levels were three times the level associated with fuel injected vehicles. Statistically significant degradation of driveability was demonstrated in these vehicles when tested on fuels with low T50 and low RVP. Driveability problems related to low T50 fuels were frequently symptomatic of vapor lock. In carbureted vehicles using high-RVP fuel at high altitudes, gasoline-oxygenate blends showed significantly improved driveability relative to pure hydrocarbon fuels. The effect of ambient temperature was greater than that of any other variable.

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

Effect of Volatility Changes on Vehicle Cold-Start Driveability

892088

View Details

TECHNICAL PAPER

Effect of Volatility on Intermediate-Temperature Driveability with Hydrocarbon-Only and Oxygenated Gasolines

912432

View Details

TECHNICAL PAPER

An Experimental Investigation into the Characteristics of a Fast-Response Flame Ionization Detector for In-Cylinder Sampling

1999-01-3538

View Details

X