Quote:
Originally Posted by padgett
The 1963 GP used the Roto-Hydramatic. (SWB cars only).
See here. |
Did you notice the vacuum gauge for the automatic 63 G/P ??, 2nd year for the G/P with a automatic gets a vacuum gauge instead of a tach.
The link you provided for the six worst automatic's was full of opinionated falsehoods about Hydramatic 375 and Tempest torque transaxle. Plus the somewhat false history and decision making of those transmissions totally inaccurate, even the bit about the Porsche 928 being the first Porsche to use the engine in front and the rear drive transaxle is false as the 924 was the first Porsche to do so.
You want to see a good race to see how well a Roto works? find the 1963 Indy nationals and see the final trophy race in A/SA between a 421 62 Cat with a Roto vs a 63 Plymouth 426wedge with a 727 Torqueflight. Pontiac grabs a little out the hole as the fluid coupling changes the ratio from 3.50 to 2.93 in first gear, 2nd gear the Pontiac fluid coupling dumps in less than four tenths of a second and is now in 2nd gear at 1.56 and since it's coupling is empty the trans is in FULL mechanical connection and when this happens the Pontiac jumps a full fender on the Mopar and pulls away, when the Pontiac shifts into 3rd or fourth range ( count all the above ) the fluid coupling fills, however only 40% of the engine torque goes through the fluid coupling and because this trans has "Split Torque" 60% of the torque in high gear is in mechanical connection.
Once a fluid coupling is spooled up it's more efficient than a torque converter and with split torque it's even more efficient.