Posted by Dean on March 16, 2014 at 13:13:24 from (24.1.134.162):
In Reply to: Horsepower again posted by gtractorfan on March 16, 2014 at 12:12:08:
Not very long.
Automobile engines are HP advertised at peak levels. Such engines can deliver such power for very limited periods as might be needed/desired in automotive applications.
I had a similar discussioin with my Father about 50 years ago. My Father was a field engineer for GM truck and bus for over 30 years. His responsibility was technical support for commercial fleet operators using GMC (Detroit) diesels and hydramatic transit bus transmissions.
At the time, I had a 64 Impala SS with 327/300, which had been modified about as far as I could do, and still drive it on the street. I was well into hot rodding at the time and was well aware of CR, fuel injection, blowers, etc.
Having often traveled with my Father, I was also well aware that the Detroit 671 and 6V71 engines displaced 426 CI, hit every revolution rather than every other, and were both fuel injected and blown. At 18, in the late 60s, I was as yet unaware of the benefits of 4 valves/cylinder (whether all exhaust or otherwise).
At the time, it was inconceivable to me that the HD Detroit 6/6V71 engines produced only 180+ HP depending upon configuration while my 327 Chevy V8 was advertised (conservatively, at the time) at 300 HP. I was 18 - 19. My Father was mid 60s, and had been a GMC field emgineer for GM since WWII, when he spent 3+ years in the South Pacific on loan to the War Department.
Upon questioning, he stated simply: Your 327 may generate 300 HP at 6000+ RPM for a few seconds or minutes. The 6/6V71 will generate 180+ HP at 1800 RPM 24 hours/day, 7 days/week, day after day, week after week, month after month, until it is time to shut it down for oil and filter changes.
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