Re: Thanks for all the response

Posted by Hugh MacKay on July 15, 2004 at 03:45:08 from (216.208.58.127):

In Reply to: Thanks for all the response posted by buck on July 14, 2004 at 19:34:57:

Buck: You have a good point on the noise levels of pickups compared to the big rigs. Most guys driving big rigs are tired of noise and most guys driving pickups are just trying to make noise.

Most of those big rigs on the highway today are making 60 mph at 1650 rpm or less. I am driving a Mack right now that actually does 60 mph at or near 1300 to 1400 rpm. Since most diesels develop maximum torque at or near 1500, not much need to turn them much more than 1800 to 2000. Some of these damn pickups are turning close to 3000 rpm. Those buyers need a bit of education; that being that the longeviety of the diesel is in the fact it can perform the same work at 1650 rpm as a similar size gasser at 3000 rpm. Thus longer wear and better fuel economy. Costs a lot of money, just to make noise.

I had a 1985 Chevy 3/4 with 6.2 diesel. Turned 1800 rpm at 60 mph. It would climb the same hill at 60 mph with 3000 lbs in box as my 350 gas would. Difference was diesel was giving close to 30 mpg while gas was around 17 mpg. Everyone remarked about how quiet it was, they were even more surprised that I got close to 500,000 miles on that engine. Truck rusted out, diesel is still going in another truck, unless it blew up in past 6 months.

That idle after start up in morning, diesel pickup is designed to idle fast until warm up. The idle is still quite noisy regardless. They don't need to be on road, that is the buyers and dealers that order them in. Those guys are the stupid bunch. You go in and try to spec out a diesel pickup turning 1650 rpm at 60 mph. It's a painful experience.

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