O
Oh do they not anymore? Could have sworn they were all over Amazon, eBay etc
SS/SC AC Compressor - Can I remove it?
- Thread starter Esstover
- Start date
Tinkles
Well-Known Member
I agree the wrap on the alternator is less than ideal.
Is there a AC pulley replacement for the LSJ? I just don't have the option to go with an empty AC compressor, since I don't got the compressor with my engine.
Otherwise, I have already an idea how to design my own AC replacement which allows for different SC pulleys as well.
Otherwise, I have already an idea how to design my own AC replacement which allows for different SC pulleys as well.
ah.b.normal
Goblin Guru
All the A/C compressors are the same so a dead one ain't too hard to come by! Gutting the compressor only saves the weight of the guts, the guts are only engaged when the electro clutch is energized; so a junk compressor is already just a heavy idler pully.
Joebob
Goblin Guru
The compressors might be the same but the 6 rib pulley is needed to run the full belt or you have to cut a rib off and risk more belt slippage using a non LSJ compressor.
ah.b.normal
Goblin Guru
OUCH! Thanks for that info! Even those 6 rib type compressors are probably easier to find than a now extinct kit!
ah.b.normal
Goblin Guru
Dorman products did not list one for the Cobalt.
He better be. And I hope this isn't a 3d printing thing.
ah.b.normal
Goblin Guru
I would try to use all three compressor mounting points on the block and maybe delete adjustability? I believe moving your idler pulley axle away from the block horizontally but not down, would maintain belt wrap around the crank pulley. You may get more wrap by moving that new idler up as well, if it is smaller in diameter than the A/C pulley. The major complaint I've heard about S/C cars is belt slippage and too little adjustment built in, though it seems that little shock absorber is very important. I've heard some complaints that the double sided belts apparently Do Not come in a wide variety of sizes! So Beware, any changes in pulley sizes can lead to belt length problems. I have never surveyed the length possibilities personally but I'd rather you find "My info is old and no longer a stumbling block" than hear later you had to redesign more bits to regain function.
jirwin
Goblin Guru
Weld on the alternator so it will actually spin backwards?
Does the non-LSJ belt tensioner have a wider pulley or does it just work as is?
This probably works find for stock pulley, but going down I doubt you'll have enough wrap to not get belt slip
95Blitz
Well-Known Member
Not really, but there is one way to find out. The way the belt runs, there should not be to much torque around the joint and It's an M10 or 12 screw. Worse case I can mill a little grove in it and lock it in place, but I doubt that is necessary.
@Gtstorey No, not 3D printed. LOL. 3D designed and milled out of 6061 Aluminum which I have laying around.
@ah.b.normal I saw some gutted AC compressors and they did not use the 3rd mounting point. That made me believe I don't need that. I was concerned about the tipping force (torque around the mounting holes to the engine). I would like to keep the adjust ability for the exact fact you describe.
@95Blitz What engine is that? I don't quite understand what you welded on the shaft of the alternator. Why wouldn't the stock work?
I think your design has some charme, I could build a bracket which mounts under the Top screw of the alternator and holds the extra idle pulley.
jirwin
Goblin Guru
LSJ. LSJ alternator has some overrun something or other. Can't remember what its called. But basically it slips one direction, but not in the other. So you can only turn it one way unless you do what he did and weld it, or replace the pulley entirely. Electrically there's nothing wrong with running these alternators backwards.
ahh, yes, right I remember. Many alternator have that, if not all ?? It Is used when you switch gears and go from higher belt speed to lower belt speed. The alternator will just follow the speed change without being harshly forced to change speed. Not really sure what problem is solved with that free spin, but I am sure if it wasn‘t necessary car manufactures would not do it.
jirwin
Goblin Guru
Right, it just keeps everything operating a little smoother. Helpful for a belt driven supercharger. The non supercharged Cobalt's alternators do not have this feature. This video illustrates the difference:
Ross
Goblin Guru
When the LSJ needs electricity, the pulley will transfer power from the belt to the alternator. When you chop the throttle, the alternator pulley will freewheel,
With this feature, the threads on the alternator pulley are tightened when charging.
Without this feature, my pulley unthreaded from the alternator as soon as I got off the throttle.
This thread explores the overrunning / decoupler pulley.
With this feature, the threads on the alternator pulley are tightened when charging.
Without this feature, my pulley unthreaded from the alternator as soon as I got off the throttle.
This thread explores the overrunning / decoupler pulley.