Re: IML: 1974 new yorker to 1968 imperial parts

[dardal@xxxxxxxxxxxxxxx]

Quoting Brad Hogg <roadhogg@xxxxxxx>:

> Ummm, does anyone seriously think they would have re-engineered the 727
> transmission due to lower HP in the 440.  The HP reduction was not all that
> substantial either.  The system used to rate HP changed dramatically and
> that accounted for the greatest differences.  Many 60s cars I've had
> experience with also had different rear end ratios that would make them
> "appear" to have more power to the driver.  Heck, my 70s big block cars have
> 2.73 gears!  It is no wonder they are doggish off the line but they highway
> cruise at 2000 rpm and get nearly 20 mpg!
> 
> Sorry, I say nae nae!

Would Chrysler de-strengthen the TorqueFlite when the torque was reduced?  I
don't know.  Auto manufacturers are always trying to reduce cost.  If the cost
savings overcome the cost to re-engineer the components, they would probably do
the changes to save money.  In this particular case, a late 60's 383 HP had at
least the same (likely more) power/torque as a mid seventies 440, so they may
have just carried out the lower stressed Torqueflites from the sixties 383 to
the 440 cars.  People that have rebuilt both types of transmissions will be
able to tell for sure if there are indeed differences in the 440 torqflites
between the years.  My mechanic has told me so, but he may be wrong, who
knows.

Yes, there was a serious loss of power and torque between 68-69 and say, 73. 
This coincided to the change of power ratings from gross to net, so its indeed
hard to tell how big the loss is, until of course you study the road tests.
Compression ratio is a very important parameter in engine performance, and it
was hacked from 10.1 to 8.2, to reduce NOx emissions.  The stock 67 (with a
"chocked" single exhaust and smaller exhaust valve heads) and 2.94 ratio would
do a 0-60 in 9.6 seconds (road test is posted in the site somewhere, the 68/69
would do even better).  In 73, they reduced the ratio to 3.23 due to the loss
in torque, and in spite of that, 0-60 time still increased to over 11 seconds
(test also in the website, also single exhaust, but these engines will suffer
less from the restictive exhaust).  The loss in performance of the Chrysler big
block is even more apparent in the Jensen Interceptors.  A 383 powered car from
the sixties was a lot faster than the 440 cars from the mid 70's, all with the
same gear ratio.  All that from road tests of the time...

D^2

> 
> 
> Please quote this message in your reply.  Otherwise I will be unable to
> reply to your message.  Thanks.
> 
> 
>


-----------------  http://www.imperialclub.com  -----------------
This message was sent to you by the Imperial Mailing List. Please 
reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be 
shared with everyone. Private messages (and attachments) for the
Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx
To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm