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Re: top speed for a 21 super clipper with 356 cu. in
#11
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Packard Don
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I don't know how official it would be for Germany but maybe one of the world-wide Packard Clubs would be willing to write something formal-looking on the Packard letterhead that might be accepted. It's just a thought.

Posted on: 2020/3/1 13:33
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Re: top speed for a 21 super clipper with 356 cu. in
#12
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Tim Cole
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It depends on the condition of the engine. An engine in worn condition may not have the horsepower to pull the overdrive at higher speeds.

It works like this: For the Packard motor at least 45% of the power output is used just to make the crankshaft go around. The horsepower required for a given speed is fixed. So if you reduce the engine speed 20% you reduce the amount of fuel required to turn the motor - hence the term Econo-Drive. The fuel required to maintain the speed is still the same.

As well, if the overdrive puts the motor rpm below the level required for a given speed the car will not go any faster regardless. This actually is a fairly common result. Take some modern cars with paddle shifters. Some of them go faster in the next lower gear.

Posted on: 2020/3/2 9:02
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Re: top speed for a 21 super clipper with 356 cu. in
#13
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John
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Aerodynamics also plays a role in top speed.

Posted on: 2020/3/2 9:17
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Re: top speed for a 21 super clipper with 356 cu. in
#14
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Packard Don
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I think he's talking about the official rated top speed, not what it might do now.

Posted on: 2020/3/2 10:32
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Re: top speed for a 21 super clipper with 356 cu. in
#15
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Joe Santana
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This is the inscrutable index of the Packard Club magazine. Only by searching the text was I able to find the article which is in Issue 66 on Page 10.

https://www.packardclub.org/download/PAC_Cormorant_Index_through_issue_177.pdf

Clipper vs Cadillac: a 1947 Comparison by Michael G.H. Scott

For $8 (plus extra postage for Germany probably) you can get a back issue:

Ordering Back Issues
Back issues are available as listed on the back page of each Cormorant magazine. Back issues are $8 each, postpaid. Send order with a check made out to The Packard Club to: Drusilla Carter, 13 Falknor Drive, Manchester, CT 06040.

Email: packardgirl@hotmail.com

Perhaps some kindly person who has that issue (1992?) would snap a photo of each page of the article and PM it to you.

Posted on: 2020/3/2 13:16
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Re: top speed for a 21 super clipper with 356 cu. in
#16
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Tim Cole
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I remembered a situation today from years ago.

Billy Hirsch got in a race on the Garden State Parkway.

It was his low mileage 49 Custom 8 with overdrive against a 40 160 sedan without overdrive. Both throttles were held wide open. The Custom 8 won, but not by a spectacular margin, and the speedometer in the 160 was reading 105. Of course those gauges aren't very accurate so the actual speeds were somewhere in the 90's.

Posted on: 2020/3/2 18:49
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Re: top speed for a 21 super clipper with 356 cu. in
#17
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Tobs
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Top speed on my 53 clipper with a 3:90 rear axle ratio is documented as 155kph in "Teil I" of my Zulassungsbescheinigung. (That long word is German for registration)
If it helps, I could send you a copy of that. I know the documentation is for a different year than your vehicle, but it is close.

Posted on: 2020/3/4 4:50
1953 Clipper Delux Club Sedan, 1969 912, 1990 Miata, 2009 Ford S-Max.
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Re: top speed for a 21 super clipper with 356 cu. in
#18
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Josef Lichtenberg
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# JoeSantana. Thank you very much for your research. i have found issue 66 on ebay. i will buy it.

Posted on: 2020/3/4 15:39
Packard Super Clipper 1947
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