HL 210 The HL 230 engine was an upgraded version of the slightly smaller
HL210 engine which was used to equip the first 250 Tiger I tanks built, and which had an
aluminium crankcase and
block. The earlier HL210 engine had a displacement of or per cylinder; with a bore of and stroke of .
HL 230 With the
HL230, engine bore was increased from . It had a displacement of , or per cylinder from a bore of and stroke of . The maximum power output was at 3,000
rpm. Maximum
torque is at 2,100 rpm. Typical output was at 2,500 rpm. The crankcase and block of the HL230 were made of
grey cast iron and the
cylinder heads from
cast iron. The engine weighed and its dimensions were . Aspiration was provided by four twin-choke
Solex type 52JFF
carburettors. Ignition was by two magnetos. The compression ratio was 6.8:1. As was typical practice for Maybach, the engine used a
tunnel crankshaft. Late in the war the HL234 upgrade with
fuel injection was recommended by the Entwicklungskommission Panzer for use in the underpowered
Tiger II tank. The power output was expected to increase to between , and with supercharging to . ==Production==