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177 Tension Spring

Old 03-25-2019, 08:57 AM
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Default 177 Tension Spring

Pulled my engines for a freshening, this thing has not been treated nicely!
Anyway one of the repairs I had to do on the Weiand 177 Supercharger was to weld up the hole for the tension spring, no problem done
My question is, there is a thicker cast area just beside where the bolt was originally installed, does anyone think there would be a problem with moving the bolt towards the thicker part. It would apply more tension to the spring by about 30 degrees
Thanks Jason
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Old 03-26-2019, 11:56 AM
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You could always use a torque wrench to measure how much additional torque will be on the idler arm at +30* preload. That will also allow you to see if it can actually be preloaded by 30* more without binding on the snout. Any more tension in the idler will add heat to the snout and case, so that is something to consider beyond if the bearing can handle it.
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Old 03-26-2019, 11:59 AM
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That's a great idea, I will try it
Thanks
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Old 03-26-2019, 12:47 PM
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Then you can figure out how much load is on the bearing and see what kind of room you have to work with at 14000rpm. Here is the bearing number.
SKF 6304 for the snout bearing

BT
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Old 03-26-2019, 01:42 PM
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Thanks for the info!
That's going to refresh my math skills!
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Old 03-26-2019, 02:04 PM
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weight x moment arm (length of idler) = torque. You'll have to solve for weight. Whatever rpm you spin your engine to x 2 will be the max rpm of the bearing iirc. Good luck.
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Old 03-27-2019, 06:45 AM
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Ok so my results are
using my current belt, with the retaining bolt in the proposed location the increased fatigue load on the bearing would be increased by 59% to a load of .212kN the bearing is rated for .333kN
The spring does not approach a bind situation but I don't like the idea of increasing the load that much so, I'll keep it in the original location
Thank you BT for your help
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Old 03-27-2019, 07:11 AM
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Glad to help and I agree with your conclusion.

BT
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