Editing Commer (section)

== Engines ==
Commer designed and manufactured its own diesel engines for its heavy commercial vehicles and buses.  They were low-profile units designed to be deployed under the floor of the cab.

=== TS3 ===
{{main|Commer TS3}}
[[File:Commer 1954 tractor unit.jpg|thumb|right|upright|Commer 1954 tractor unit]]
The TS3 engine was a two-stroke diesel unit with three cylinders each containing a pair of pistons arranged with the combustion chamber formed between the crown of the piston pair and the cylinder walls. It was designed specifically for the Commer range of trucks.<ref>{{cite web |url=http://www.commer.org.nz/Commer_Connections/Other.html |title=The TS3 |access-date=2008-11-05 |quote=The TS3 was initially designed by Rootes Power Units Chief Engineer Eric W Coy (and under him, designers Bennett and Mileluski) at the Humber plant (Stoke-Aldermore) in 1948. It was designed solely to meet Rootes production planning requirements for an underfloor 105&nbsp;hp diesel engine for the new forward control Commer range of heavy trucks. |url-status=dead |archive-url=https://web.archive.org/web/20081119151638/http://www.commer.org.nz/Commer_Connections/Other.html |archive-date=19 November 2008 |df=dmy-all }}</ref> The TS3 and derivative TS4 were unique in using rockers to deliver power to the single crankshaft.<ref>{{cite web |url=http://www.commer.org.nz/Commer_Connections/Other_2_Strokes.html |title=Other Two Strokes |access-date=2008-11-05 |quote=Many two-strokes used opposed piston layouts, but the design feature that set the TS3/4 apart from other two-strokes was the use of rockers to transmit power from the piston to the crankshft and the use of a single crankshaft. |url-status=dead |archive-url=https://web.archive.org/web/20100522123547/http://www.commer.org.nz/Commer_Connections/Other_2_Strokes.html |archive-date=22 May 2010 |df=dmy-all }}</ref>

=== TS4 ===
The TS4 engine ran 1.2 million miles as a pre-production prototype. It was a 4-cylinder version of the TS3.<ref>{{cite web |url=http://www.commer.org.nz/Commer_Connections/TS4_Motor.html |title=The TS4 Prototype |access-date=2008-11-05 |quote=All the 14 prototype TS4s were test bed run initially. Six stayed in test bed work and eight were put in trucks for road evaluation, prior to going into production. The engines that were put in trucks ran up to 1.2 million miles between the 8 of them, trouble free, before being pulled out and scrapped on instructions from Chrysler to protect Chrysler’s joint venture in England with Cummins. |url-status=dead |archive-url=https://web.archive.org/web/20081014115611/http://www.commer.org.nz/Commer_Connections/TS4_Motor.html |archive-date=14 October 2008 |df=dmy-all }}</ref>
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