Engine size

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Nov 22, 2002 | 07:35 AM

elliott

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Senior User

Joined: Dec 2000

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Engine size

I posted a question about engine rpm for towing.

Now I have a question that goes along with that. In F600/700 trucks, they use 370/429 ci engines. These trucks will run down the highway at road speed. Ryder, Uhaul, etc, with a GVW up just under CDL requirements, which I beleive is 24K.

If a F600/700 can use a 370, why does a Class A or C motorhome or cutaway, come with 460's? What don't I understand? Is it because they use a light duty auto (compared to an Allison)?

Thanks for any input. Elliott

Nov 24, 2002 | 12:34 AM

big_country_ch19

Freshman User

Joined: Nov 2002

Posts: 48

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From: Kings Island (north of Cincinnati)

Engine size

the license class has nothing to do with engine size. motor homes came with bigger engines because of the mountain ranges that most travelers encounter. the class is rated by 1) weight and 2) brakes (air brakes require a CDL) I personally have a class A, I was a over the road truck driver.

Jack

Nov 24, 2002 | 12:51 AM

LxMan1

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Joined: Dec 2001

Posts: 22,436

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From: Louisville,Ky.

Engine size

They use light truck trannys and accessory drives on the front of the engine. The 370/429 large truck engines ude larger crankshaft snouts and must use the larger accessories to go aaalong with them. They also have a larger rear crank snout which is different from the lighter duty engines.
They make less power than the 460's and make up for it with more tranny gears and steeper rearend gears.