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Carnival Trucks of Yesteryear

Old Show Trucks Moved The Big Shows

 Before Automatic Transmissions and Air Conditioners

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The difference between west coast trucks and eastern or midwestern show trucks is that many west coast rigs may be outfitted with several more important gauges that inform the driver of what his truck is doing. Remember that the western states have enormous mountain ranges like Donner in California that rise thousands of feet high with passes that may require an hour or more of steady, hard pulling to get over. Before the massive truck engines of today, that put out hundreds of horses were the rule, the work of climbing these high mountains had to be done with the transmission or transmissions. I once drove a 5 speed main box with a three speed Brownlipe aux transmission coupled to a two speed rear end. That was 3 sticks in the cab that had to be shifted in multiple combinations through the steering wheel. I can tell you that climbing the long mountain ranges on jumps like the 1200 miler from Saskatchewan Canada to Las Vegas Nevada would flat wear you out in one of these old monsters.
We had temp gages on the rear differentials to monitor axel temperatures but one of the most important gages on the smaller early diesel engines was a Pyrometer . A pyrometer tells you exhaust gas temperature. Why would you need to know this? Well…diesels do not have vacuum on the intake side, however if for some reason there was restriction, by nature diesels will start putting out very hot exhaust.
Topping one those high mountains at extreme altitudes could cause an exhaust manifold to really glow from the heat.
Note: There is a twenty five degree increase of temperature per 1,000 foot increase in altitude.
On a hot day crossing a desert like the Mojave, a high intake ambient air temperature is normal. For every one degree increase in the external temperature there is a three degree increase in exhaust temperature. Another situation to watch was when a hill was being crested. The engine had to be cooled by shifting down and backing out of the throttle because the engine would cool down too fast. All of these things could blow a turbo or damage valves and leave you along the road on a freezing mountain pass or a scorching desert. No cell phones to call for help back then, you just waited it out for the show mechanic who could be as much as a day behind you if he was having trouble with another truck. Driving old show trucks like these took a certain skill, dedication to attention and a little bit of reckless insanity.

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