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      12-06-2008, 10:18 PM   #289
haen
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Quote:
Originally Posted by Sticky View Post
Of course it doesn't produce as much power for its weight, it has far less displacement, only logical. It produces proportional power to the motor it is based on, logical. It also makes more power per cubic inch, doesn't it?
What do you mean it produces proportional power to the motor it is based on? Proportional in what regard? More importantly, give the whole HP/liter concept a rest. You have failed to bring any new information to the discussion and constantly refer to this single aspect of engine design.

Quote:
Originally Posted by Sticky View Post
You don't seem to get it. The M3 motor uses higher quality components and is more technologically advanced. If the parts are stronger, what makes you think they are more stressed? Once again, considering the E46 M3 could hit more than double the factory hp, seems to me the parts can handle 8k no problem. The Z06 is the one who's rods start to give out at <20% torque increase.
Why would BMW (or any manufacturer) put exotic, expensive, high strength components in an engine if they didn't have to? BMW is in the business of making money and no company gives stuff away for free.

You said "If the parts are stronger, what makes you think they are more stressed?". You have the concept backwards. The parts have to be stronger because of the increased stress placed on them from spinning at a higher RPM. Let's work with an example to make this clearer. Imagine one of the pistons in your M3. It is changing directions 6,000 times a minute when your engine is spinning at 3,000 RPM. When you raise the engine speed to 6,000 RPM, the piston is changing direction 12,000 times a minute. Does it not make sense to you that there is more stress on a piston changing directions 16,000 times a minute at 8,000 RPM than another piston changing direction only 12,000 times a minute at 6,000 RPM. If this concept doesn't make sense to you, you need to take high school physics again, pay extra attention to the chapter on reciprocating mass.
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