Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 169 - DIESEL SMOKE MEASUREMENT PROCEDURE
Section 169.9 - Chart reading-general engine applications

Universal Citation: 67 PA Code ยง 169.9

Current through Register Vol. 54, No. 44, November 2, 2024

The following procedure shall be used in reading the smoke opacimeter recorder chart:

(1) Locate the start of the acceleration modes tested under the provisions of § 169.5(2)(i) and (iii) (relating to smoke test cycle) and the start of the lugging mode tested under the provisions of § 169.5(3) on the speed trace.

(i) Divide both of the acceleration modes into .5 second intervals beginning at the start of the first acceleration of each test. Determine the average smoke reading during each .5 second interval.

(ii) Locate and record the 15 highest .5 second readings during both acceleration modes of each smoke cycle. Average the 45 readings from the three cycles. Record and designate this value as (a), which shall represent the acceleration smoke characteristic of the engine.

(2) Locate the lugging mode tested under the provisions of § 169.5(4).

(i) Divide the lugging mode into .5 second intervals and determine the average smoke readings during each .5 second interval.

(ii) Locate and record the five highest .5 second intervals during the lugging mode. Average the 15 readings from the three cycles. Record and designate this value as (b), which shall represent the lugdown smoke characteristics of the engine.

(3) Reexamine the average .5 second intervals of paragraphs (1)(ii)-(2)(ii) and locate the highest .5 second reading during each dynamometer cycle. Average these three readings from the three cycles. Record and designate as (c), which shall represent the peak smoke opacity characteristic of the engine.

(4) Locate the last 15 seconds of the rated speed mode of each cycle tested under the provisions of § 169.5(3)(ii). Determine the average smoke reading during this period. Average the three values and record and designate as (d), which shall represent the full load, rated speed smoke characteristic of the engine.

(5) Locate the last 15 seconds of the intermediate speed mode run of each cycle tested under the provisions of § 169.5(5). Determine the average smoke reading during this period. Average the three values and record and designate as (e), which shall represent the full load, intermediate speed smoke characteristic of the engine.

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