[Ozzmann]

I have a a/c 69 car which I am in the process of refitting the a/c.
At the moment it has non a/c top and bottom pulleys
part #'s 9790846 and 9796060.
I have picked up the a/c pulley which fits to the balancer part # 9790843.
From what I have read I need to change my 2 pulleys to a/c ones
part #'s 9790842 and 9796061.
Why is my question, what is the problem?
Excuse me if this is a dumb query.

[mike nixon]

Non A/c cars have a larger diameter w/p pulley than the A/C cars. This accomplishes two things. The first is to spin the W/P faster for better coolant flow. the second is it speeds up the Alternator so it can charge a bit more to keep up with the added draw of A/C.

Mike

[68gtoMN]

Mike's correct. This is a system and matched components must be used to ensure proper functioning. Get both pulleys and install.

[Ozzmann]

Non A/c cars have a larger diameter w/p pulley than the A/C cars. This accomplishes two things. The first is to spin the W/P faster for better coolant flow. the second is it speeds up the Alternator so it can charge a bit more to keep up with the added draw of A/C.

Thanks for that, makes sense. I have the short water pump, can anyone tell me if the part #'s I'm chasing are correct?

[rolling money pits]

Originally Posted by mike nixon

Non A/c cars have a larger diameter w/p pulley than the A/C cars. This accomplishes two things. The first is to spin the W/P faster for better coolant flow. the second is it speeds up the Alternator so it can charge a bit more to keep up with the added draw of A/C.

Mike

you sure about that, speeding up the alt?

a change in w/p pulley diameter would have no affect on the speed of the alt.

only a larger crank ( or smaller alternator ) pulley would affect its speed.

and now that i read that again, going to a bigger w/p pulley, wouldnt that in fact make it spin slower? it's the same as going to a smaller ( under drive ) crank pulley?

[webfoot]

I think he's speaking from the A/C car perspective, since that is what ozzman has.

[68gtoMN]

Part Nbr | Group Nbr | Car Type | Description | Start Year | Ending Year
9790842 0.659 All V/8 A.C PULLEY (8'' dia.) (2 groove) 1968 1970

9796061 1.062 F/8 H.T.A.C PULLEY (2 groove) (61/4'' dia.) (exc, V,P. fa 1969 1969

[Ozzmann]

9796061 1.062 F/8 H.T.A.C PULLEY (2 groove) (61/4'' dia.) (exc, V,P. fa 1969 1969

Is this pulley for a 69 GTO or 69 firebirds only??

[Ozzmann]

Can anyone answer this for me, pretty please.

[slowgto]

The GTO restoration guide, page 372, lists 9796061
, so looks like GTO application.

[johnta1]

You don't have power steering?

Also, what water pump, long or short?

[Ozzmann]

You don't have power steering?

Also, what water pump, long or short?

I do have power steering and A/C and the short water pump.

The GTO restoration guide, page 372, lists 9796061
, so looks like GTO application.

But it also lists 9796062, this is where I'm confused, one is for Firebird and one isn't but no mention about GTO.

[johnta1]

The '061' is listed for the Firebird.
The '062' is listed for All Pontiacs, which I'd say includes the GTO.

The '061' is a smaller diameter than the '062'.

Hope this helps.

[70Steve]

9796062 lists as; 69 all V8 A.C. (2 groove 7 3/16 dia) (use with oe waterpump cast number 9796351).

9796061 lists as F/8 H.T. A.C. (2 groove 6 1/4 dia) (use with oe waterpump cast number 9796351). As 68gtoMN listed above.


*What John said! LOL.*