Quote:
Originally Posted by racer_X
What is the difference in weight between the 2.7 and the 3.0?
Also, does the 2.7 from the RS last longer than the 2.7 in the 911S? Or are they prone to the same failures?
What is the difference in terms of cooling, stud failures and valve seat failures?
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Weight differences are about 20 lbs.
MFI engines tend to run significantly cooler than CIS ones due to differences in fuel mixtures, however a 210BHP motor makes more heat than a 175BHP one does.
Both engines cool the same; its all about how the engine is configured and having a front oil cooler system.
Magnesium-cased engines had steel studs which never broke; 3.0 ones had the 1st generation Dilavars which were problematic.
Neither engine had valve seat failures; both engines suffered from soft valve guides and that's easily resolved with a good aftermarket guide.