Overdrive crank dampers
04-24-2016, 03:26 PM
#141
I'll be kicking myself when I find out that you get it to work, because I just recently ordered the 10% OD balancer from IW after they told me the 15% couldn't work.
The picture below shows how much space is left between the balancer and the WP pulley. It has roughly 3/8" of space to work with. The belt has to fit between there though, but that's only 1/8" thick.
If you figure that a factory balancer is exactly 7 5/8" in overall diameter (I just measured mine) and the IW 10% is exactly 8 1/4" in overall diameter, then the 15 % OD will probably only add another 1/2" in diameter at the most, so the gap should only close by half of that which is ~1/4" which would barely leave enough space for the belt. That space would only be to the outer lip of the pulley though and the diameter of the ribs wher the belt would run would be smaller, so once you get the belt on, it should work. If it does, it will be very close.
I'm all ears to hear what happens with it though, because my math is based partly on speculation, sort of like a political poll...
04-24-2016, 05:28 PM
#142
IW told me that their 15% OD would not work with the stock WP pulley. I'm not so sure now though. I think it going to be very close, but you'll be fine. You may have to loosen the water pump bolts to get the belt on though. Lol.
I'll be kicking myself when I find out that you get it to work, because I just recently ordered the 10% OD balancer from IW after they told me the 15% couldn't work.
The picture below shows how much space is left between the balancer and the WP pulley. It has roughly 3/8" of space to work with. The belt has to fit between there though, but that's only 1/8" thick.
If you figure that a factory balancer is exactly 7 5/8" in overall diameter (I just measured mine) and the IW 10% is exactly 8 1/4" in overall diameter, then the 15 % OD will probably only add another 1/2" in diameter at the most, so the gap should only close by half of that which is ~1/4" which would barely leave enough space for the belt. That space would only be to the outer lip of the pulley though and the diameter of the ribs wher the belt would run would be smaller, so once you get the belt on, it should work. If it does, it will be very close.
I'm all ears to hear what happens with it though, because my math is based partly on speculation, sort of like a political poll...
I'll be kicking myself when I find out that you get it to work, because I just recently ordered the 10% OD balancer from IW after they told me the 15% couldn't work.
The picture below shows how much space is left between the balancer and the WP pulley. It has roughly 3/8" of space to work with. The belt has to fit between there though, but that's only 1/8" thick.
If you figure that a factory balancer is exactly 7 5/8" in overall diameter (I just measured mine) and the IW 10% is exactly 8 1/4" in overall diameter, then the 15 % OD will probably only add another 1/2" in diameter at the most, so the gap should only close by half of that which is ~1/4" which would barely leave enough space for the belt. That space would only be to the outer lip of the pulley though and the diameter of the ribs wher the belt would run would be smaller, so once you get the belt on, it should work. If it does, it will be very close.
I'm all ears to hear what happens with it though, because my math is based partly on speculation, sort of like a political poll...
Yeah I hope to have it by the end of this week when I get back from Vegas and hopefully next Sunday I will try and put it on and see if it fits. Arun swears it will and is supposed to send me photos where he has done it before.
05-20-2018, 05:07 PM
#143
1st Gear
Member Since: May 2018
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Old thread but I'm in the process of doing this same IW balancer swap as we speak. Not alot of info down here in Australia. Cheers
12-14-2019, 03:32 PM
#144
Instructor
12-14-2019, 10:48 PM
#145
ATI also sells water pump pulleys, but they don’t list the diameters, just the width (length) of the pulley. Not sure if any of those will work on a stock LS7 water pump. You could give them a call and ask though. If you do and you find out anything useful, please post back on here.
See here:
http://www.atiracing.com/products/da...harger.kit.htm
12-15-2019, 10:03 AM
#146
Drifting
Thread Starter
12-16-2019, 11:33 PM
#148
With the stock height engine mounts, it should clear the cradle, but I’m not so sure about the WP pulley.
Just took a quick look at IWs website.
According to them, the 10% which I have in my car, is 8.125” dia. and the 15% is 8.35.
So, 8.35” - 8.125” = .225” and .225\2= 0.1125”.
If you look at the picture above that I posted back in 2016, you can see that an additional .1125” should be possible.
Last edited by CI GS; 12-16-2019 at 11:43 PM.
12-17-2019, 02:35 PM
#149
Le Mans Master
A 15% (8.35”) is as large as you can fit on one of these cars without the balancer hitting on the cradle and/or the water pump pulley. The only company I know that makes one that big is IW.
With the stock height engine mounts, it should clear the cradle, but I’m not so sure about the WP pulley.
Just took a quick look at IWs website.
According to them, the 10% which I have in my car, is 8.125” dia. and the 15% is 8.35.
So, 8.35” - 8.125” = .225” and .225\2= 0.1125”.
If you look at the picture above that I posted back in 2016, you can see that an additional .1125” should be possible.
With the stock height engine mounts, it should clear the cradle, but I’m not so sure about the WP pulley.
Just took a quick look at IWs website.
According to them, the 10% which I have in my car, is 8.125” dia. and the 15% is 8.35.
So, 8.35” - 8.125” = .225” and .225\2= 0.1125”.
If you look at the picture above that I posted back in 2016, you can see that an additional .1125” should be possible.
12-17-2019, 06:33 PM
#150
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CI GS (12-17-2019)
12-18-2019, 09:54 PM
#154
Drifting
02-02-2020, 12:09 PM
#157
Drifting
Thread Starter
01-10-2021, 01:06 PM
#158
Drifting
Thread Starter
Bumping this up. Decided on a 10rib, 10%od. There is a dual key way option and a supercharger hub option. I understand the dual key way needs the crank removed to install? Definitely not interested in that? What is the supercharger hub exactly? Thanks folks.
01-10-2021, 01:17 PM
#159
Race Director
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St. Jude Donor '15
The supercharger hub is basically a heavy duty hub to help handle the extra torque when spinning big blowers. You def. do not want the dual keyway unless you have a crank with matching key ways, which I'm assuming you don't
The heavy duty hub part you could probably go either way on unless you're spinning a huge blower, though, if you're already going to be spending the money and time doing the work of swapping out the HB, then you're probably better off going ahead and doing it for peace of mind. You're probably going to want their pinning kit as well, it is a very cool piece.
I recall @CI GS got the blower hub option and their pinning kit and it was a beast to get on, but ultimately works great. I also remember there were some complications with the seal, so you may want to read through the Magnuson thread (https://www.corvetteforum.com/forums...s-fall-36.html) if you get really bored--somewhere in there is some good info on installing this balancer
https://innovatorswest.com/instructi...structions.pdf
The heavy duty hub part you could probably go either way on unless you're spinning a huge blower, though, if you're already going to be spending the money and time doing the work of swapping out the HB, then you're probably better off going ahead and doing it for peace of mind. You're probably going to want their pinning kit as well, it is a very cool piece.
I recall @CI GS got the blower hub option and their pinning kit and it was a beast to get on, but ultimately works great. I also remember there were some complications with the seal, so you may want to read through the Magnuson thread (https://www.corvetteforum.com/forums...s-fall-36.html) if you get really bored--somewhere in there is some good info on installing this balancer
https://innovatorswest.com/instructi...structions.pdf
Last edited by schpenxel; 01-10-2021 at 01:20 PM.
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JetstreamGS (01-10-2021)
01-10-2021, 01:21 PM
#160
Drifting
Thread Starter
You’re the man! Crank is stock so single key way is the way to go. Could I run it on stock 6-rib until I’m ready to do the direct drive conversion?