Engine: R1 Differences ?

[studebro2]

Other than the type of, and location of the serial number, are there any other differences between and Avanti and Studebaker R1s. Mine is a 63 Avanti R1 with 10.25 compression. I assume the same engine was available in a Studebaker. Would it also be true that the Power Shift transmissions would also be the same?

Thanks,
Gary

[BobPalma]

An R1 engine installed in an Avanti would have a different water pump manifold and alternator location than one installed in a Lark or Hawk, and would have stainless-steel ignition shielding around the spark plug leads. But the engine internals and output would be identical. Powershift transmissions would be the same, too. BP

[Jerry Forrester]

Are you saying an Avanti is not a Studebaker? I always thought if it had a Studebaker engine, installed by Studebaker Corp., it was a Studebaker.

Other than the type of, and location of the serial number, are there any other differences between and Avanti and Studebaker R1s. Mine is a 63 Avanti R1 with 10.25 compression. I assume the same engine was available in a Studebaker. Would it also be true that the Power Shift transmissions would also be the same?

Thanks,
Gary

[klifton1]

Just a Lark in a party dress.
Klif

[bezhawk]

In addition the vibration dampener is different on JT engines. (has a groove machined into it). The valve covers on an Avanti do not have ignition wire retainer clips.,The right side exhaust manifold doesn't have any alt bracket on an Avanti, it's the same as the left side.
Of course the Avanti would be numbered R xxx, and the Lark/Hawks would be numbered JT for Jet Thrust! There are two(2) different Power Shift transmissions. One for rear axle ratios under 4.09:1 (green tag) and those for 409:1 and above (red tag) They had different springs in the valve body to control shift points.

[SN-60]

The Power-Shift transmission would be the same across the board.

[studebro2]

First let me apologize for the lack of detail. This is a 54 Starlight with Avanti running gear.
Based on your inputs, I am assuming I have a hawk waterpump (casting number 534562) probably came of the donor car along with exhaust manifolds, power streeing and dash. I've also learned that it has a 'green tag' powershift.
Thanks for clearing this up for me.

[nels]

In addition the vibration dampener is different on JT engines. (has a groove machined into it). The valve covers on an Avanti do not have ignition wire retainer clips.,The right side exhaust manifold doesn't have any alt bracket on an Avanti, it's the same as the left side.
Of course the Avanti would be numbered R xxx, and the Lark/Hawks would be numbered JT for Jet Thrust! There are two(2) different Power Shift transmissions. One for rear axle ratios under 4.09:1 (green tag) and those for 409:1 and above (red tag) They had different springs in the valve body to control shift points.

Not saying you are right or wrong on the valve body, I never checked the parts book; but I always thought the green tag on the transmission was needed due to the different speedo gear pressed onto the output shaft for the 4.09 and higher rear gear cars?

[bezhawk]

Yes that too! Actually the speedometer drive gear is held in place by a snap ring, and is prevented from rotating on the shaft by a detent ball.

[nels]

Yes that too! Actually the speedometer drive gear is held in place by a snap ring, and is prevented from rotating on the shaft by a detent ball.

Bez,
I just went through the parts book and the only difference between the two power shifts is the speedo gear. The valve bodies and governors all have the same part number.

Also, not sure on this. But isn't the green tag for 4.09 and up and the red tag for gear ratios numerically lower than 4.09?

[52 Ragtop]

Just a Lark in a party dress.
Klif

More like a Lark in drag! <G>

Jim

[bezhawk]

Bez,
I just went through the parts book and the only difference between the two power shifts is the speedo gear. The valve bodies and governors all have the same part number.

Also, not sure on this. But isn't the green tag for 4.09 and up and the red tag for gear ratios numerically lower than 4.09?

All the ones I have seen for the highway gears (and rebuilt)have been green tag units. I believe the pressure regulator is different too.

[WCP]

Green tag - 3.73 and below. Red tag - 4.09 and up. Interestingly, the 1st powershift serial #10001 is a red tag unit.