'Groovy' Avanti!

[mfg]

Other than the number of grooves, Studebaker Avanti R1 and R2 water pump pulleys are exactly the same.....True?

[brad]

Diameters are different too.

[mfg]

That's true!.....Anything else?

[64studeavanti]

I am confused, according to the parts book, both are the same (1556483) except for R1 with A/C (15673110).

[mfg]

I am confused, according to the parts book, both are the same (1556483) except for R1 with A/C (15673110).

You're confused for good reason...I goofed!!!......I meant to say R1 w/air Avanti water pump pulley versus R2 Avanti water pump pulley.....SORRY!!

[64studeavanti]

Still confused. I have 2 63 R1 and 1 64 R1 all with A/C. All have 3 groove pulleys. The inner groove drives the alternator, the next the A/C compressor. The outer most groove is not used. A couple years ago, I purchased the S/C brackets and a Paxton SN89. Using the same pulley, everything lines up. The inner groove still drives the alternator and the two outer drive the blower. Obviously, if you have no A/C and no S/C, you only need a single groove to drive the alternator. To add A/C, you need 2. For the S/C, you need 3.

Upon further research, P/N 15673110 is part of the Idle Speed Improvement Kit. So maybe, before the kit, all the pulleys were the same????

What is the answer???

Edited June 1, 2015 by 64studeavanti

[mfg]

I've always thought original Avanti R1 w/air water pump pulleys were made of aluminum, while the Avanti R2 (and non-a/c R1) water pump pulleys were made of cast iron.......No?

[64studeavanti]

All the ones I have are cast iron and 3 groove. I can't believe that they have all been replaced. Maybe the pulley for the idle speed improvement kit that came out in March 64 was aluminum and only had 2 grooves. I believe that SI sells one like that.

[mfg]

You're probably correct about that......Thanks for the education!!