UPDATE:
Added specs on Z4 GT-cars (P65B40) prior to 2011 season (attached FIA homologation sheets)
-Removed dead Youtube links
Please see original post.
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ABSTRACT:
I came across more information regarding the P65B40 engines used in the Z4 GT(3) cars prior to the 2011 Season & Official FIA documents showing that they share the same bore & stroke as well as design as the S65.
This contrasts to previous ambiguity within the community that suggested the P65B40 was derived from the P60B40 from the E46 M3 GTR.
The P60B40, as far as i know from my own research, was a clean sheet design not based on any production engine (rumors suggest S62 but it is not true) & the P65B40 in the Z4 GT cars, based on this evidence was derived from the S65, not P60.
However, this newfound information only shows that the P65B40 in the Z4 race car is a modified S65, but still leaves uncertain about the relation with the engine in the M3 GT2 (which incidentally also has a P65).
IS THE P65 IN THE Z4 GT3 & THE P65 IN THE M3 GT2 RELATED? & TO THE S65?
I've come across a multitude of sources describing the P65 in the M3 GT2.
Some sources (
Turner) say it is a further development of the P60 from the M3 GTR, while others (
Motorsport.com,
Racecar Eng.) say it is based on the S65B40 & list bore & stroke as identical to the S65.
We now know the P65B40 and the P65B44 in the Z4 GT cars are derived from the S65, which makes the case for the M3 GT2 even stronger, but I have yet to come across an absolute concrete source.
If someone with inside knowledge from BMW or a racing team can chime in, i'd greatly appreciate it. Any other updates, corrections, etc. are welcome but please provide credible source(s); i'd like to keep this thread as academically accurate as possible.
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Some of the changes made to Z4 section as follows:
Quote:
Engine until 2010 Season: BMW P65B40 4.0L (3999cc) V8 (Motorsport engine based on S65B40 from E9X M3; same basic engine block but with dry-sump lubrication, see attachment)
Engine from 2011 Season: BMW P65B44 4.4L (4361cc) V8 (Motorsport engine based on S65B44 from M3 GTS; dry-sump lubrication)
Media:
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