Pictured here is one of 14 prototypes of the TS4 - the four cylinder version of the TS3 which was being developed when Chrysler took over Rootes Group. Only 4 of the 14 prototypes built survive.
This is the only surviving Stage II design TS4 prototype. The Stage II prototype had the scavenge blower mounted on top of the airchest rather than on the front of the engine as shown on the Stage I design prototype below. The Stage II prototype also featured a variation in design in the timing gear housing to provide for the new blower drive position and the new position for the DPA injector pump, which was moved over towards the injectors to make room for the blower.
The Stage II blower drive was considerably shorter than the Stage I and the design for the drive was not fully developed at the time Chrysler terminated the project. The re-positioning of the blower was conceived to shorten up the length of the engine and although this engine has a Wade 6R034 blower fitted (same dimensions as the earlier TS3 blower, but modified by Wade Engineering of Birmingham to produce more air for the TS4), the production version of the Stage II design was intended to utilize a smaller, more efficient scavenge blower to reduce the height of the production engines.
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.
This right hand side shot shows the oil cooler and filter which are larger than those on the TS3. The housing between the blower and the block that the oil cooler is mounted on, contains a Holset harmonic damper which is mounted on the crankshaft inside the engine.
The blower is identical externally to the TS3 but is different internally to produce more airflow/pressure for the 4th cylinder.
Also noticeable is the large expansion chamber exhaust manifold, bigger water pump and alloy sump
The trolley is the original modified by Tillings Stevens in 1967 to wheel the engine around - note how it has been extended for the TS 4.
This rear view shot shows the marks on the bell housing from the engine dynometer adapter. Clearly visible are the 4 injectors and 4 exhaust port manifold. The rear engine mounts on the prototype TS4 were fitted to the bell housing rather than on the flywheel/timing gear housing (as per the TS3).
