2002 tii air conditioning crank pulley metal fabricating?

[NMDerek]

1 hour ago, gambitpaul said:

Watching this thread I am wondering could you not add a pulley in front of the crank pulley, essentially doubling up. Plenty of aftermarket pulleys around, could be installed with longer bolts and a short spacer. And I think there are double v belt pulleys that can be made to work.

 

I am sure the clearance to the fan would be a concern. But an electric fan could solve that. And the compressor would need to be moved forward to align.

 

For that matter could a serpentine belt situation be made to work? Put an older and the compressor in the same plane as the crank pulley. Run everything on one belt?

 

Just a thought if the ac tii hub is so hard to find.

good ideas, im just brain storming to see solutions to the unicorn but adding a pully seems like a good lead. serpentine yes but does the tii air box get in the way? Maybe I check euro ebay or try the $160 elec compressor, it seems a shame this part is unobtanium but slaying the unicorn would be nice and employing yall expert retired engineers to have a hobie dave run is compelling to put up 5k of cash to start a organized  BMW mafia.

 

Edited August 22 by NMDerek
spelling

[NMDerek]

4 hours ago, Arman said:

@NMDerek I have this old compressor with a bracket that looks like the second pic you took. 

I got one collecting dust to, it's the the tii clutch/pully that is silly rare. anyone got an idea how  BMW made them in the first place? 

[wmax351]

Could also consider welding on the AC part of the pulley. 

[NMDerek]

1 minute ago, wmax351 said:

Could also consider welding on the AC part of the pulley. 

so just get stock 02's and weld the extra pully slot?

[wmax351]

 

1 minute ago, NMDerek said:

so just get stock 02's and weld the extra pully slot?

 

Add the AC pulley slot for the tii non-a/c pulley. 

[wmax351]

BMW 2002 Parts BMW 2002tii Parts & MegaSquirt Parts Specialty Store - Pulley with Sensor Mount » 02Again

02AGAIN.COM

 

Adding the pulley and cogwheel to the hub may be the easiest 

 

 

[gambitpaul]

1 minute ago, wmax351 said:

 

 

Add the AC pulley slot for the tii non-a/c pulley. 

Yeah if you could get a pulley with a large enough bore to fit around the middle landing. Weld it in place. Probably need to balance it.

[wmax351]

13 minutes ago, gambitpaul said:

Yeah if you could get a pulley with a large enough bore to fit around the middle landing. Weld it in place. Probably need to balance it.

I would probably try to clean up the landing, then shrink fit an aluminum or steel  ring on. Then machine the ring into a pulley. 

[dlacey]

3 hours ago, gambitpaul said:

could you not add a pulley in front of the crank pulley, essentially doubling up. Plenty of aftermarket pulleys around, could be installed with longer bolts and a short spacer. And I think there are double v belt pulleys that can be made to work.

 

I am sure the clearance to the fan would be a concern. But an electric fan could solve that. And the compressor would need to be moved forward to align.

 

For that matter could a serpentine belt situation be made to work? Put an older and the compressor in the same plane as the crank pulley. Run everything on one belt?

 As you say, problem with a double pulley is lack of clearance for Rad fan...and fitting and electric 'puller' fan is tough because the water pump spindle sticks way forward and interferes with  the fan assembly... a pusher is a tight fit without cutting metal, 12" max and that is marginal performance.

 

I have a single pulley serpentine setup on my 02 turbo and it works fine...just needs some special bracketry.

 

Another option for a new tii-style pulley could be a steel pulley produced on a lathe plus a  plastic 3D printed toothed-belt-drive bonded on  -   late model kugelfischer pumps had a plastic drive pulley, so its not impossible to use plastic there.

[TobyB]

9 hours ago, gambitpaul said:

Yeah if you could get a pulley with a large enough bore to fit around the middle landing. Weld it in place. Probably need to balance it.

 

Easy enough to just  machine that blank step for a multi-v belt....

 

....or turn a single- v pulley with an id small enough for a shrink fit.

 

t

 

[wmax351]

11 minutes ago, TobyB said:

 

Easy enough to just  machine that blank step for a multi-v belt....

 

....or turn a single- v pulley with an id small enough for a shrink fit.

 

t

 

 

The diameter would probably be too small for most AC compressors to spin fast enough. I suppose you could find one with a real small multirib pulley though and try that. 

 

A shrink fit pulley or in-situ machined shrink fit ring is the way to go here. 

[Arman]

Anybody have dimensions or maybe the tooth count on their own pulley?

[wmax351]

In one of the topics, I saw a comment about pressing off an AC pulley (to add a supercharger pulley). So perhaps that is how the factory did it as well. 

[Stevenc22]

Im looking into this. Something like this pulley bored to fit the hub should work.

 

GATES Tru-run Steel V-belt pulley 37380 7800-0030 3” OD 1/2” Bore A Groove

WWW.EBAY.COM

---

<p>New old stock </p>

 

I just need to confirm the AC pulley outer dimension and the hub dimension.

 

 

Edited August 22 by Stevenc22

[Arman]

2 hours ago, Stevenc22 said:

Im looking into this. Something like this pulley bored to fit the hub should work.

 

GATES Tru-run Steel V-belt pulley 37380 7800-0030 3” OD 1/2” Bore A Groove

WWW.EBAY.COM

---

<p>New old stock </p>

 

I just need to confirm the AC pulley outer dimension and the hub dimension.

 

 

I got a lathe and mill if you would want me to try Boring it out