1. Design

2. Models
     303 version    315 version    315/1 version    319 version    319/1 version    326 version    320 version    327 version  

3. See Also

4. References

The BMW M78 is an overhead valve straight-six petrol engine which was produced from 1933 to 1950.^[1] It is the first straight-6 automobile engine produced by BMW, an engine layout which been a key feature of the brand for many years since.^[2]

The M78 was launched in the 1933 BMW 303.^[3] In 1936, the higher performance BMW M328 straight-six engine began to be produced alongside the M78.

Design

The M78 has an iron block and cylinder head.^[3] It was designed by Rudolf Schleicher.^[3]{{refpage|page=25}}^[4]

Initial versions of the M78 had the same bore and stroke as the four-cylinder engine from the BMW 3/20. Later on, the bore spacing was increased to allow for an increase in bore and to provide for more crankshaft bearings.{{citation needed|date=November 2018}}

In 1952, the BMW M337 engine was introduced as the replacement to the M78. Compared with the M78, the M337 has a revised cylinder head, a new inlet manifold and a reinforced crankshaft with bigger, more modern bearings.^[5]{{refpage|page=88}}^[6]

Models

303 version

This first version of the M78 had a bore of {{convert|56|mm|in|2|abbr=on}}, a stroke of {{convert|80|mm|in|2|abbr=on}} and a compression ratio of 5.6:1.^[5]{{refpage|pages=33-36}} It produced {{convert|22|kW| bhp|0|abbr=on}} and {{convert|68|Nm|lbft|0|abbr=on}}.^[7][1]

Applications:

• 1933-1934 303

315 version

A development of the 303 version, where the bore was increased from {{convert|56|to|58|mm|in|2|abbr=on}} and the stroke was increased from {{convert|80|to|94|mm|in|2|abbr=on}}.^[5]{{refpage|pages=33-36,39-40}} The compression ratio remained at 5.6:1.^[5]{{refpage|pages=39-40}}^[14] This engine produced {{convert|25|kW| hp|0|abbr=on}} at 4000 rpm.^[8]

Applications:

• 1934-1937 315

315/1 version

An upgraded version of the 315 engine with the compression ratio increased to 6.8:1^[5]{{refpage|pages=39-40}}^[9] and using three Solex carburetors.^[5]{{refpage|pages=39-40}}^[9] This version produces {{convert|30|kW| hp|0|abbr=on}} at 4000 rpm.^[9]

Applications

• 1934-1937 315/1

319 version

The 315 engine was enlarged to {{convert|1911|cc|cuin|1|abbr=on}} for the 319.^[10] This was a result of increasing the bore to {{convert|65|mm|in|2|abbr=on}}and the stroke to {{convert|96|mm|in|2|abbr=on}}. This engine produced {{convert|45| bhp|kW|0|abbr=on|order=flip}} at 3750 rpm.^[5]{{refpage|page=44}}

Applications:

• 1935-1937 319
• 1937 329

319/1 version

The 315/1 engine was enlarged to {{convert|1911|cc|L|1|abbr=on|disp=flip}} for the 319/1.^[10] This was a result of increasing the bore to {{convert|65|mm|in|2|abbr=on}} and the stroke to {{convert|96|mm|in|2|abbr=on}}. This engine produced {{convert|55| bhp|kW|0|abbr=on|order=flip}} at 4000 rpm.^[5]{{refpage|page=44}}

Applications:

• 1935-1937 319/1

326 version

The 319 engine was enlarged to {{convert|1971|cc|L|1|abbr=on|disp=flip}} for the 326 by increasing the bore by one millimetre to {{convert|66|mm|in|abbr=on}}. Twin {{convert|26|mm|abbr=on}} Solex carburetors were used. The compression ratio was raised to 6.0:1.^[5]{{refpage|page=46}} This engine produced {{convert|50|bhp|kW|0|abbr=on|order=flip}} at 3750 rpm.^[5]{{refpage|page=46}}^[11]

Applications:

• 1936-1946 326
• 1938-1950 321

320 version

The 326 engine was detuned (by using a single carburetor) for the 320 and 321. This engine produces {{convert|34|kW| bhp|0|abbr=on}} at 3750 rpm.^[12]

Applications:

• 1937-1938 320
• 1938-1941 321

327 version

The 327 used a version of the 326 engine with a new cylinder head, yielding a 6.3:1 compression ratio and a slight power increase to {{convert|55|bhp|kW|abbr=on|order=flip}} at 4500 rpm.^[5]{{refpage|page=68}}

Applications:

• 1937-1955 327
• 1949-1953 340

See Also

• BMW
• List of BMW engines

References

• Personality clash
• Personality clashed
• Personality clashes
• Personality Comics
• Personality conflict
• Personality conflicts
• Personality cores
• Personality Crisis (song)
• Personality cult of Kim Il-sung
• Personality cults
• Personality Disorders
• Personality disorders
• Personality Disorders: Theory, Research, and Treatment
• Personality in animals
• Personality inventories
• Personality-Job Fit Theory
• Personality-job fit theory
• Personality judgment
• Personality Parade
• Personality Research Form
• Personality Squares
• Personalized audio messages
• Personalized audio messaging
• Personalized digital television
• Personalized gun