While doing some research for my recent addition of the Opel 1.5 (80x74) and 1.7 (85x74) 4-cylinder OHV engines used in the Rekord models imported here from 1958-1962, I found some interesting tidbits of history I thought I'd share with the history buffs here. Most interesting is the use of four main bearings in a four cylinder engine, unique in the auto industry.
This 1.5 OHV engine was first installed as standard equipment in an Olympia in December of 1937! It was Opel's first OHV and oversquare, bore larger than stroke, engine and was used unchanged as standard equipment for certain Opel models until 1960. Beginning in 1959, Opel also offered an increased bore 1.7 version of this engine optionally, becoming the standard engine for 1961-1962.
Once and for all, Pertronix to coil hookups:
Pertronix RED (PR) wire -
Pertronix BLACK (PB) wire -
Stock or any "non-internal resistance" coil (Bosch "red" coil, etc.):
1. Leave stock + wires "as is" and connected to + side (15) of coil.
2. Connect (PB) wire and green tach wire to - side (1)...
Here is a listing of US-spec distributor advance limits for 1.9 litre engines. One item worth noting is that automatic-equipped versions of these model year Opels had different advance rates (the advance occurred sooner), which was accomplished by using lighter tension springs on the mechanical...
For reference, here is a photo of a 2.4 Opel exhaust manifold. Compared to the typical Sprint manifold, it has larger runners, a larger collector flange, and has the outlet flange located further back than a 1.9's.