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1938 Mack FH Dump Truck


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57 minutes ago, Hobert62 said:

Courious what would road speed be of a chain drive be?   

Using different size drive sprockets, ratios could be changed relatively easily to adjust the effective mph of a vehicle.

In that time period, typical road speeds were 35-40 mph.  During WWII, there was a mandated 35 mph national speed limit.  I would speculate the FH did most of its heavy hauling work at 25-30 mph and 35+ mph running empty.

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Jim

It doesn't cost anything to pay attention.

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I had a set of 30 tooth primary and 40 tooth secondary sprockets made for my my AC and AC 6 that will allow 50+ out of them. They are copies of OEM Mack ones from the early 1930's. The orange AC with the diesel at the Winchester show does 60 -65 with the same set up. You have more chance of spitting the chain on a bicycle then the Macks.

Edited by 41chevy
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"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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21 hours ago, j hancock said:

During WWII, there was a mandated 35 mph national speed limit.

What was the reason? Fuel savings? Was it for commercial vehicles or for everybody? Just have never heard about it.

Никогда не бывает слишком много грузовиков! leversole 11.2012

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It was for everyone.  It was a measure to help conserve gasoline and rubber.  A lot of the natural rubber supply was now in Japanese or unfriendly control and synthetic rubber hadn't really come onto the scene.  Ration fuel and people drove less and with a national speed limit, they had to slow down and the tires didn't get abused and lasted longer.

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Jim

It doesn't cost anything to pay attention.

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On 05.12.2017 at 10:15 PM, j hancock said:

It was for everyone.  It was a measure to help conserve gasoline and rubber.  A lot of the natural rubber supply was now in Japanese or unfriendly control and synthetic rubber hadn't really come onto the scene.  Ration fuel and people drove less and with a national speed limit, they had to slow down and the tires didn't get abused and lasted longer.

Jim, thank you for pointing that out. For me it's an interesting page of history. And not American-related only.

Никогда не бывает слишком много грузовиков! leversole 11.2012

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