When Sammy Miller acquired the engine from Jock West thirty years later to rebuild the AJS V4 for his museum, he found the crankpin still seized.
12.
This is achieved by changing the ignition timing, changing or re-timing the camshaft, and sometimes in combination with a change in crankpin angle.
13.
A feature of this engine was the shared use of a single crankpin for both cylinders, this caused vibration as the pistons moved in the same direction.
14.
This carried a sliding crankpin journal for the centre axle, and bearings for the long coupling rods to the unevenly-spaced pairs of drivers ahead and behind.
15.
However, in 1978 Chevrolet introduced a 90?200 / 229 V6, which had a compromise'semi-even firing'design using a crankpin that was offset by only 18?
16.
Then in 1981 the ignition timing which was by then electronic, was moved to the left side and in 1982 the Jota 120?was released which had the crankpin phasing to 120?
17.
The WHE-DR design eliminated the spider bearing by having each cylinder offset from the others longitudinally so that the connecting rod big ends can fit on a shared crankpin side by side.
18.
Note that at the two " dead centres ", when the connecting rod is on the same axis as the crankpin on the driving wheel, the connecting rod applies no torque to the wheel.
19.
Nine of Harley-Davidson's competitors filed comments opposing the application, arguing that cruiser-style motorcycles of various brands use a single-crankpin V-twin engine which produce a similar sound.
20.
Usually, " V "-form engines have their transversely paired cylinders'conrods'" big ends " simply placed side by side on the crankpin, with their transverse pairs of cylinders offset to match.
