What about converting to vette/ car accessories?

 

Yea I can measure it when I get home.

The way I picture it is the biggest loads are obviously the blower and the crank. The water pump, alt, and ps pump all draw power but not near as much. From some googling it looks like the alt is maybe 8hp and the waterpump is about 10, ps pump is probably in that range also. A 2.3L blower making 12.5psi at 6000rpm draws about 96hp, which is a belt load of about 250lb. I think I measured the HD tensioner at ~70lb at full rotation.

This load is between the crank and the blower, while the tensioner on the backside just has to take up the slack of the belt stretching and provide enough normal force on the blower and crank pulleys to keep the belt from slipping. The total belt tension though will be the sum of everything. So lets say all the accessories together are 25hp@6000rpm, that's about 64lb, plus the blower at 245 and the tensioner at 70 and that's about 380lb on the belt at full go.

So yea you are right the direction of tension wouldn't reverse, but it would cycle from 380lb to 150lb or so and back. It wouldn't spike, but it would decrease in a step then build back up as the engine revs.

 

After the pain in the *** it has been to get all these pulleys lined up hell no!

 

does the LS3 5th gen Camaro water pump suffer from the same issue?

 

Ive read of a few guys having the same issue. Generally goes something like pulley falls off, then they pin or weld it then it breaks the shaft.

 

Pulley measurements:

Overall diameter: 5.84in
Overall height: 2.71in
Wall thickness: 0.149in
Hub length: 0.965in
Hub ID: 0.72in
Hub OD: 1.165in
Hub wall thickness: 0.229
Hub land thickness: 0.250in
Hub land diameter: 1.70in
Belt land: 1.30 in

 

Awesome, I'll see about getting that analyzed today. I'll post the results. Only other piece is getting the angle between the belt coming to and from the pulley so I know what area to put the load on. If you are close to it let me know otherwise I'll Google it and use a protractor.

 

I would guess about 240 degrees since I have an OD crank pulley.

 

Anxiously awaiting the FE results haha....I could draw it for you in solidworks if that would make it easier.

 

haha sorry been super busy and I wanted to double check something in my model with one of the analysis guys. I analyzed it with 2 programs and got similar stresses. I put 480 lbs of force (2X belt tension) on it as a pressure to simulate the belt's uniform load. I am seeing about 80 MPa of stress which if the pulley is made from just mild hot rolled steel is close to 50% of yield. (This would explain the breaking that was seen in the past around the hub where the stresses are greatest) I get a max deflection of less than 0.2 mm, which is what I was suspicious of, but I guess it wouldn't take much to release the press fit hold especially with the 480 ft-lb moment that the belt load puts on the pulley. I'll upload some screen shots later today hopefully and some more thoughts on what could be going on.