1921→1926 Pierce-Arrow Series 33
In 1921, Pierce slight revised their Model 32 into the Series 33 which would be produced until 1926. It was the ultimate version of Pierce-Arrows huge six-cylinder engine with the ‘Dual-Valve’ cylinder head.
The engine made great use of a twin-spark setup with twin coils, distributors and spark plugs. A switch on the dashboard could turn on either bank of plugs.1
From earlier models, the Series 33 rode on Westinghouse air-spring shock absorbers that relied on a Kellogg air pump driven off the transmission.1
Later refinements to the series included vacuum assisted brakes and a single 14-tower distributor.1
Sources & Further Reading
1. The Pierce-Arrow Society. The Roaring Twenties.
In Detail
| type | Series Production Car |
| production years | 1921 – 1926 |
| price $ | $ 6,500 |
| engine | Dual-Valve Inline-6 |
| position | Front, Longitudinal |
| aspiration | Natural |
| ignition | Delco Dual-Ignition System |
| block material | Cast Iron in Pairs |
| valvetrain | SOHC, 4 Valves per Cyl |
| displacement | 6784 cc / 414 in³ |
| power | 74.6 kw / 100 bhp |
| specific output | 14.74 bhp per litre |
| top speed | ~120.67 kph / 75 mph |
