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Old 11-11-2017, 04:44 PM   #21
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Quote:
Originally Posted by RV Randy View Post
Back to the original question: Any comparison of fuel MPG between the 350 and the 450? Just curious how much difference it makes to have the bigger motor.
Sorry for derailing your thread...my post had absolutely nothing to do with mileage.

My apologies.
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Old 11-12-2017, 02:53 AM   #22
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The Business Class M2 112 (like the 106) has a lightweight aluminum cab that maximizes payload and resist corrosion. Freightliner's AirLiner rear suspension rated up to 52,000 pounds - this truck delivers a smooth, even ride under the most demanding conditions. In fact, with frames of up to 3.7 million RBM (see definition below) and 1,500 square-inch radiators, the Business Class M2 112 can tackle the toughest jobs.

Resisting Bending Moment (moments are force, or weight, multiplied by distance)
describes the ability of the frame to resist the moments from the load and truck components; section modulus describes the shape of the material; and yield strength describes the material strength. The RBM is the product of the section modulus (SM) and the yield strength (YS) in inch-pounds and is a measure of the capability of the frame rail. Some manufacturers of equipment such as cranes specify either a section modulus or RBM for the chassis frame. Chassis manufacturers supply frame information with RBM, section modulus, and yield strength in truck data books and body builders books.
So, RBM = SM × YS.

“Why is that important?” you ask. It describes the maximum load the manufacturer says we can put on the frame in moments.

M2 106 RBM = 650,000 RBM
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Old 11-12-2017, 06:07 AM   #23
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You can clearly see the different frame sizes they use here for different HP/TQ engines that they install, amazing that they have a frame rail specification for each variation in engine hp/tq....thats some very interesting engineering...

As you can see on Page 3-29 the frame rails for M2 106 Frame

And on Page 3-32 the frame rails for M2 112 Frame

http://www.m-m-s.com/vocrefguide/m2/...assisframe.pdf
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