It's hard to believe that Chrysler would purposedly gives a lower HP figure
than its competitors. Horsepower being what it was for car sales in the '50s
and '60s, they would certainly follow the common practice among car
manufacturers, in order to stay in the competition. Furthermore, that would
mean that Chrysler manufactured engines that pumped out 100 hp (or so) more
than their competitors for the same global price. Among the big three,
horsepower was often similar for a given engine class.
And finally, the way an engine was dynoed was pretty much defined as an SAE
norm. Until the early '70s, an engine was dynoed stripped from all its
accesories, just as you described it. Then they switched to fully dressed
engine, because it meant more to the basic customer. Being a norm, every
manufacturer switched to that new procedure. You can check the HP ratings
for a similar engine between say 1970 and 1974, you'll see the difference,
EVEN at Chrysler.
Vincent Van Humbeeck
'58 Plymouth Belvedere Sport Coupe
-----Message d'origine-----
De : Forward Look Mopar Discussion List
[mailto:L-FORWARDLOOK@xxxxxxxxxxxxx]De la part de Ray Jones
Envoye : dimanche 28 septembre 2003 5:53
A : L-FORWARDLOOK@xxxxxxxxxxxxx
Objet : Re: [FWDLK] DAMMIT, we're in agreement; I hate that!
No documentation, but here's how I heard it many years ago from one who
worked in styling. When Chrysler dynoed an engine, it was full dress. that
is, with all accessories, such as water pump and gen/alt. A/C wasn't as
common then, so probably not on the engine.
When Ford and Chevy did it, they used stripped eng with the proper temp
water pumped thru with an external pump, good coll air supplied, and nothing
that could rob some power working.
So , when Chrysler said it was 285 hp, that was as delivered and used in
your car, and it was usually rounded down, say from 288 or suchlike. Ford
and Chebbie weren't even close to the claimed in usable form.
That's what the man said.........
Ray Jones
From: DupontTim@xxxxxxx
Reply-To: DupontTim@xxxxxxx
Date: Sat, 27 Sep 2003 20:31:50 EDT
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: Re: [FWDLK] DAMMIT, we're in agreement; I hate that!
Gang, I firmly believe that advertised HP ratings are mostly cooked up. But
in my documents there is one factory supported reference. I have a factory
dyno sheet on the newly available 56 D500-1 dual quad engine dated 3-9-56
and it was done on a used D500 mule engine with the key dash one parts added
i.e. the dual intake and Large exhaust (2 1/2 incher 4 bolt flange) which by
the way unlike Chryslers were not truck but D500 only for 56, the cam was
stock D500 and so was the CR at 9.25. The readings peaked at 276 HP & 322
ft lbs about 16 over the D500 advertised rating. The engine however was then
improved with the higher compression heads and reprofiled cams for high
speed, the carbs were also eventually rejetted after dyno work by Danny
Eames in April. However when I had the privilege of talking to a Kiekhaefer
dyno mechanic referred to me by Wayne G a few years back he stated that
routinely the Dodges when blueprinted and dyno tuned were in excess of 1 HP
per cubic inch with all "stock" components and likewise the Chryslers easily
exceeded all stated ratings. This leads me to believe that the factory was
in no way looking to boost ratings. Just my 2 cents, Tim
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