Re: how many hp to turn an 80A alternator at full tilt?
- From: Rui Pedro Mendes Salgueiro <rps@xxxxxxxxxxxxxxx>
- Date: Thu, 13 Oct 2005 18:52:21 +0100 (WEST)
the fly <tsetse51@xxxxxxxxxx> wrote:
> Nowhere near the nominal rating. Just like automotive engine
> power output. Run it at the "rated" power continuously, and the
> machine's life is measured in minutes, not hours.
If by "minutes" you mean something like 12099 minutes (201 hours = 8.375
days). In August 13 ??? 21, 1983, Mercedes decided to beat the 50000 km
speed record (something that nobody had bothered to do for some years
(Mercedes itself with the C111 of the 1970s, I think)). From these pages:
C111:
http://www.germancarfans.com/classics.cfm/classicid/5040823.001/page/2/lang/eng/mercedes/1.html
http://www.pistonheads.com/doc.asp?c=103&i=6730
http://www.mbspy.com/c111_III.htm
Mercedes 190 E 2.3-16:
http://www.germancarfans.com/classics.cfm/classicid/5040331.009/page/2/lang/eng/mercedes/1.html
http://www.benzworld.org/news/news.asp?id=238
"After 201 hours, 39 minutes and 43 seconds, two of the cars had clocked
up 50,000 kilometers. The replacement parts carried on board in compliance
with the regulations had not been required ??? the cars had been running
perfectly smoothly despite the extreme strain. The third car was laid up
for three hours by a broken distributor rotor arm ??? an item costing
just a few cents, which the pit crew were not allowed to replace but
had to repair."
So, 22 years ago a good car was capable of running its engine at full
power (or very nearly) for 201 hours almost continuously:
"Every two-and-a-half hours, the cars came in for refueling and a change
of driver during a 20-second pit stop. The heavily strained rear tires
had to be replaced every 8,500 kilometers and the front tires every
17,000 kilometers. During these five-minute tire change breaks, the oil
and oil filters were also replaced and the valve clearance was checked."
I think that later other manufacturers were also interested by this record.
I found mention of Saab at Talladega (1986 and 1996):
http://www.thecarconnection.com/Vehicle_Reviews/Luxury_Cars/1999_Saab_9-3.S183.A800.html
http://www.saab.com/main/GLOBAL/en/awards_9000.shtml
http://www.swedecar.com/saab_history.htm
http://business.fortunecity.com/bechtel/441/17.html
1986: 100,000 km with an average speed of 213.299 km/h = 468.825 hours
1996: 226.45 km/h over 25,000 miles/40,000 km. = 176.639hours
And this year another record attempt by Mercedes with a Diesel:
http://www.germancarfans.com/news.cfm/newsid/2050502.003/mercedes/1.html
Mercedes E 320 CDI 100,000 miles (160,934 km)
Standing start 224.823 km/h ??? 139.699 mph*** World record **
715.825 hours = 29.82 days ~= 1 month !
It is likely that these endurance records can be beaten, but it would
be quite boring and expensive.
--
http://www.mat.uc.pt/~rps/
..pt is Portugal| `Whom the gods love die young'-Menander (342-292 BC)
Europe | Villeneuve 50-82, Toivonen 56-86, Senna 60-94
.
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