Hi,
This thread makes very interesting reading. I like to learn more about Mercedes engine design. Just wanted to add some comments (sorry they're a bit out of date.
Quote:
Originally Posted by JayRash
Eric, i know but even the 3.0 and 3.2 of the same yrs made alot more power (286Hp & 321HP).
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We got this BMW in the UK - S52 motor (3.0 286hp from approx 93-97, and 3.2 321hp from 97-99). What I can say is that in the UK it's a well known fact the 3.2 version does not manage the quoted output. They make 305-310hp in reality. Also the motor had double VANOS (BMW's form of variable valve timing) but am I right in thinking that just affects torque curve, doesn't affect top-end power? Or perhaps it does affect top end power because you can get better emissions and still the car is road legal even with high power output?
Quote:
Originally Posted by 400Eric
I don't think M.B.'s switch away from CIS-E gained them much horsepower because the 5.0 M119 didn't gain even 1 horsepower when it ditched CIS-E. Remember, the M119 did not get a new head design when it switched F.I. systems.
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Well officially there is no difference but of course sometimes the manufacturers lie. Or perhaps it is better with EFI, but they wanted to keep power to ~325hp (it is plenty after all) and instead change the cams for better torque and still maintained the same power? But actually I think you're right there CIS-E is not too bad for power. Remember 2.5-16 Evo II makes ~235hp from on it. And 2.5 S14 bmw engine only makes ~240hp with EFI and independent throttle bodies. That said my friend has a 1990 2.3 S14 bmw with 269hp! Make me cry a bit. My 2.5-16 made 187hp on the same dyno
. I wish there was more Mercedes engine expertise around - but what I am reading here is good learning!