C240 RPM's
Thread Starter
Member
Joined: May 2006
Posts: 94
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From: Lake Worth, FL
2006 C280
C240 RPM's
Took delivery of a CPO 2005 C240 Wagon last week. When crusing at 70MPH with the transmission in 'D', the engine is turning 3,000 RPM. Sounds kind of high to me. Can anyone confirm if this is normal?
Thread Starter
Member
Joined: May 2006
Posts: 94
Likes: 0
From: Lake Worth, FL
2006 C280
Originally Posted by barrykaye
Took delivery of a CPO 2005 C240 Wagon last week. When crusing at 70MPH with the transmission in 'D', the engine is turning 3,000 RPM. Sounds kind of high to me. Can anyone confirm if this is normal?
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
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From: Orange County
2005 C Wagon (No snickering please!)
Originally Posted by lkchris
Smaller the engine, higher the rpms needed to produce the power.
NOT an American car with gigantic engine. 2.4l = 146 cu in.
NOT an American car with gigantic engine. 2.4l = 146 cu in.
I think the transmission gear ratio and the rear end gear ratio along with tire circumference determine the speed of the car at a given engine RPM, not the horse power, nor the displacement. While we are on the subject of displacement, A NAFTA 2005 C240 has a 2.6l/159 cu. in. engine.
The value of 3000 rpm at 70 mph is correct, and is similar to a range of German cars like VW, Porsche, Audi, and Ford.
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Joined: Sep 2005
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From: Albuquerque
'10 CL550, '12 GL550
Originally Posted by Moviela
I think the transmission gear ratio and the rear end gear ratio along with tire circumference determine the speed of the car at a given engine RPM, not the horse power, nor the displacement.
However, if you don't have the horsepower, you need the gears that make the engine spin fast.
