m30 / m90 curiosity question

[rsporsche]

been wondering about this for a bit ... question is which engine models had single width timing chain, which ones had double width? can't recall anybody ever talking about it, but i know both exist.
m30 b28
m30 b30 <double 1974>
m30 b32
m30 b34 (US)
m30 b34 (euro)
m30 b35 <single 1989>
m90 <single 1979> <double 12/1980>

 

[eriknetherlands]

My m90 has a single. From a 735i E23 Sept 1979

 

[bdigel]

my memory is poor but I think pre 78 had double while 79 and later were single

 

[Thomas76]

1974 3.0 S had double
1989 535 M30b35 had single

 

[Thomas76]

Newer M30b28 with FI. Single

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[ScottAndrews]

The M90 has a single. I believe the M88/S38 have a double row chain (same block as the M90).

 

[Markos]

The M90 has a single. I believe the M88/S38 have a double row chain (same block as the M90).

M88 has a single also. S38 has double.

 

[SamiA]

My M90 has double chain. At least now and through out my ownership the chain has been double. Engine origin M535i Dec 1980.
View attachment 220729

Sami

 

[rsporsche]

Newer M30b28 with FI. Single

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please define 'newer m30 b28'

 

[ScottAndrews]

My M90 has double chain. At least now and through out my ownership the chain has been double. Engine origin M535i Dec 1980.
View attachment 220729

Sami

Curious if you have the VIN on the engine. RealOEM shows the 1980 535i as having a single row. For all the cars I looked at on RealOEM, the double row sprocket is listed in the figures, but it is greyed out, and only the single row is actually shown in the parts list