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- Publisher
- Emerald Publishing
- Copyright
- Copyright © Emerald Group Publishing Limited
- ISSN
- 0036-8792
- DOI
- 10.1108/eb053439
- Publisher site
- See Article on Publisher Site
Abstract
Th e Revised SAE Classification of Crankcase Oils The revised classification for crankcase oils, passed "by the Society of Automobile Engineers Fuels and Lubricants Technical Committee -were given in Say- bolt Universal Seconds in our last issue, but there was not time before closing for press to give the Redwood -and Centistokes conversions. These are now included hereunder and are, we believe, self explanatory. The conversions generally, are approximate, but are sufficiently accurate for all normal purposes. FORME R SA E CRANKCASE OILS CLASSIFICATION in Saybolt Universal Seconds. REVISE D SA E CRANKCASE OIL CLASSIFICATION VISCOSITY RANGES IN SAYBOLT UNIVERSAL SECONDS (Figures in bracket s Rive approximat e centbtokes) I n Saybolt Universal Seconds. SA E At 130°F A t 210°F. VISCOSIT Y RANGE, SAYBOLT UNIV. SEC. No . (Equivalen t Centistokes in brackets) Minimum . Minimum . Maximum . SA E Maximum . No . a t 0°F. a t 210°F. 10 90 (18.2) 120 (25.2) — — Min . Max . Min . Max . 20 120 (25.2) 185 (39.8) — — 30 185 (39.8) 255 (55.0) 5W 4,000 (8S0) —— — — — — 40 255 (55.0) 80 (15.6) — —— 10 W 6,000 (1,320)* 12,000 (2,010) — — 50 80 (15.6) 105 (21.7) — — 20 W 12,000 (2,040)** 48,000 (10,500) — — 20 45 (5.75) 58 (9.7) WINTER ENGINE OILS — — 30 58 (9.7) 70 (13.0) Viscosity Range a t 0°F Saybol t Universal Seconds. — — 40 70 (13.0) 85 (10.85) — — 50 85 (16.85) 110 (22.75) Minimum . Maximum . — — *Minimu m viscosity of 10 W at 0°F . ca n be waved if viscosity 10W 5,000 10,000 a t 210°F. is no t below 40 SSU (4.2 cs.) 20 W 10,000 40,000 **Minimu m Viscosity of 20 W a t 0°F . ca n be wave d if viscosity a t 210°F. is no t below 45 SSU (5.75 cs.) FORME R REVISE D SA E CRANKCASE OILS CLASSIFICATION SA E CRANKCASE OIL CLASSIFICATION in Redwood Seconds. I n Redwood Seconds Conversion s t o Redwood a t 200 °F . are approx. an d depen d slightl y on V.I . SA E VISCOSITY RANGE IN APPROXIMATELY REDWOO D SECONDS. No . (Figures in bracket s give approximate centistokes). VISCOSIT Y RANGE, REDWOOD SECONDS A t 140°F A t 200 ° F (Equivalen t Centistokes in brackets). SA E No . Minimum . Maximum . Minimum . Maximum . a t 0°F. a t 200 °F . Min . Max . Min . Max . 10 70 (15.0) 90 (21.2) — — 20 90 (21.2) 130 (31.4) 5\V 3,520 (880) __ — — — — 30 130 (31.4) 180 (43.9) 10 W 5,250 (1,320)* 10.560 (2.640) — — — — 40 180 (43.9) 81 (18.4) 20 W 10,560 (2,640)** 42,000 (10,500) — — — — 50 81 (18.4) 105 (24.7) 20 43 (6.6) 55 (10.8) — — — — 30 55 (10.8) 07 (14.5) — — 40 G7 (14.5) 83 (19.0) — — 50 83 (19.0) 112 (2G.5) — — •Minimu m viscosity of 10 W a t 0°F . can be waved if viscosity PERMISSABL E LIMIT S FO R VISCOSITY UNDE R REVISED a t 200°F. is no t below 38 Redwood Seconds (4.7 cs.) SA E CLASSIFICATION . FO R OILS O F 100 V.I . an d 0 V.I . ••Minimu m viscosity of 20 W a t 0°F . ca n bo wave d if viscosity Figure s are in Redwoo d Seconds for a n SA E 30 grade a t 200°F. is no t below 43 Redwood seconds (6.60 cs.) (Centistokes in brackets). classification. The example taken is for a grade having Viscosity Viscosit y a t 100°F. a t 200 °F . Viscosity at 140°F a Viscosity Index of 75 and though figures are approx- imate only, they are enlightening. 100 V.I. Oil Minimu m Vis. 350 (86.1) 135 (32.7) 55 (10.8) 0 V.I. Oil. APPROX . VISCOSITY LIMITS FOR 75 V.I. OILS UNDER Maximu m Vis. 1,040 (255.4) 245 (59.9) C7 (14.5) REVISE D SAE CLASSIFICATION Figure s given in Redwoo d Seconds (Centistokes in brackets) . Vis . a t 100 °F . Vis . a t 140°F. Vis . a t 200 °F . The tables give the former figures for Grade . Min . Max. Min . Max. Min . Max. comparison. A table and graph are also 20 175 (12.8) 420 (103.4) 74 (16.7) 140 (34.0) 43 (6.6) 55 (10.8) included to show the somewhat wide 140 (34.0) 200 (48.9) 30 420 (103.4) 660 (162.0) 55 (10.8) 67 (14.5) limits possible under the revised class- 40 660 (162.0) 1,000 (246.0) 200 (48.9) 285 (69.8) 67 (14.5) 83 (19.0) ification. It is possible tha t these limits may be even wider tha n under the former 50 1,000 (246.0) 1.450 (357.0) 285 (69.8) 405 (99.7) 83 (19.0) 112 (20.5) Scientific LUBRICATION January, 1951
Journal
Industrial Lubrication and Tribology – Emerald Publishing
Published: Jan 1, 1951