A Novel Laboratory Method for Evaluating Induction System Deposits in Gasoline Engines

This report covers work undertaken at the U.S. Army Fuels and Lubricants Research Laboratory to develop a laboratory bench procedure for the evaluation of dispersant-detergent gasoline additive effectiveness used for the control and/or inhibition of carburetor and engine intake system deposition. The development of the synthetic crankcase off-gas liquid in Phase I of this project has made it possible to develop a bench procedure that correlates to actual engine results in:

1. 1.
   The carburetor throttle plate and throat area,
2. 2.
   The induction system (port and valve areas), and
3. 3.
   Additive effectiveness.

The apparatus is simple in design and operation, and provides the advantage of evaluating both carburetor and intake deposits simultaneously.