Re: Re: Re: Re: Re: Detroit Diesel Horsepower Numb

Posted by Dr. Detroit on December 24, 2005 at 23:38:48 from (65.151.232.152):

In Reply to: Re: Re: Re: Re: Detroit Diesel Horsepower Numbers posted by Mopower on June 16, 2005 at 13:32:36:

These guys do not know what they are talking about. 90% of their information is wrong! The 8V-71N did not stop at 318 HP, it ended automotive service at 340 HP. The 8V-92TT was never rated 550 HP! The TT stands for 'Taylor Torque'. TT engines are actually power reduced. The 430 & 450 HP engines are throttle dropped to 400 HP. However, this gives the engine a flat HP curve from peak torque at 1300 RPM to peak HP @ either 1800 or 1950 RPM. Redline on a standard large bore diesel is 2100 RPM. The TT engines got very good mileage in the 6-7 mpg range. The 6V's ran 7 mpg consistently with the torque of an NTC350 (small cam) 1,050 ftlbs. For the record and the last time the word is CUMMINS!!! The engine is named after the inventor of that engine line 'Clessie Cummins'who by the way also invented the Jake Brake. But I'm sure these smart guys know that story too. Detroit Diesel nomenclature 8V-92TA = 8 cylinders, V block configuration, 92 the number of cubic inches per cylinder (8x92= 736 cubic inch displacement), T turbocharged not turbo, A aftercooled. I - does stand for intercooled but the highway engines were not both Intercooled and Aftercooled. It was one or the other. Further a charge air system is an Intercooler - it is placed between the turbocharger and the intake manifold which with the Detroits is the positive displacment Roots type blower or SUPERCHARGER. For the Einstein who stated that Detroits balk when the road heads uphill - He is full of it. That's Cummins 'BULL'. My 8V-92TA @ 475 HP & 1330 ft lbs. of torque has kicked too much Cat, Cummins & Mack butt uphill or on flats. My engine logs a consistent 5 mpg. My old 8V-71N's @ 318 HP did exactly the same.What a lot of people do not seem to know: I have never heard lack of power complaints for the old 12V-71's. At 540 HP they were the biggest thing out there for years. The 8V-92's were the replacement for the 12-V's. The 6V-92's replaced the 8V-71 series. That guys fuel mpg for Cat was wrong. Cat's are excellent engines. The Cummins is not superior to the Cat. It is a matter of preference. His engine life numbers were from la-la land. The design life of the big cam was 350,000 miles with 100,000 mile warranty. The Detroit 92's had a design life of 600,000 miles with a warranty of 2 years and 200,000 miles - unconditional. A friend of mine took her 8V over 1,000,000 miles, as did another friend with an E9 Mack.I know of a lot of Cat's in the 500,000 - 700,000 mile range. I think this guy needs to learn the subject. Cat's are legendary for low end grunt. Why do you think they are in all of those earthmovers? Cat's engines are primarily designed for it's earthmovers. That's 3116 through 3406 which are also sold for on highway use. I could go on but this would take all night.

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