Sulzer ZG9

{{notability|date=September 2012}}

Sulzer ZG9 was a pre-World War II opposed-piston two-stroke diesel engine by Sulzer.{{cite book

|title=Modern High-Speed Oil Engines

|last=Chapman |first=C.W.

|publisher=Caxton

|volume=I

|edition=2nd

|year=1956

|ref=Modern High-Speed Oil Engines, Vol I

|pages=222–223

}}{{Cite book

|title=The Oil Engine Manual

|date=1939

|last1=Williams |first1=D.S.D.

|last2=Millar Smith |first2=J.

|editor= The Oil Engine (journal)

|publisher=Temple Press |location=London

|ref=Oil Engine Manual

|pages=120–121

}}

The engine was available with a choice of two, three and four cylinders (2ZG9, 3ZG9, 4ZG9); the two-cylinder version developed 120 bhp. It used a piston scavenge pump. This was mounted vertically above one rocker, driven by a bellcrank from the main rockers. This engine is sometimes cited as an inspiration for the Commer TS3 design.{{cite web

|title=Rootes-Lister TS3

|url=http://www.oldengine.org/members/diesel/Rootes-ListerTS3/TS3.htm

|publisher=www.oldengine.org

|access-date=2012-09-23

|archive-date=2016-05-02

|archive-url=https://web.archive.org/web/20160502025953/http://www.oldengine.org/members/diesel/rootes-listerts3/ts3.htm

|url-status=dead

}}