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dampers
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ac80701985 View Drop Down
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Joined: 12 Feb 2012
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Points: 34 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac80701985 Quote  Post ReplyReply Direct Link To This Post Topic: dampers
    Posted: 26 Jan 2013 at 10:01am
building an open rpm 426  hot farm.   wondering about a damper and what is better fluid or rubber and why. thanks
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wi50 View Drop Down
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Joined: 24 Sep 2010
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Points: 1010 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wi50 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2013 at 9:18am
Fluid works better than rubber and is also safer.  Typical rubber balancers are made of cast iron.  Fluid made with a steel caseing and will survive higher RPM.  Also rubber dampers have a tendancy to seperate over time.
 
Any damper is better than no damper.  If you're going to run 3000 RPM than I probably wouldn't spend the money on a fluid damper or the work to customize the crank nose or make some kind of mounting hub to put it on.  Maybe someone's got a simple solution and knows of a fluid damper that fits without much work, I'm just not familular with the 426.
"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20494 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2013 at 8:05pm
Crank pulley and fluid dampner from any 7080-7580-8070-4W220-N5-N6-R5-R6 all bolt right onto any 426 crank nose..
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bsallis180 View Drop Down
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Joined: 29 Jul 2013
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Points: 209 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bsallis180 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2016 at 9:35am
digging up some old threads...  looking for some fluid dampner info in a 301 application over 3k rpm 
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20494 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2016 at 3:34pm
426 fluid damper (from 7080-7580-8070-4W220-N5-N6) works well on a 301. I think Kenny's pulling parts may make the hub to mount it to. I've seen a model F- combine cast iron pulley machined to accept the 426 fluid damper.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20494 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2016 at 3:40pm
You should also use a little longer Gr8 NF bolt, as the crankshaft nose will accommodate that and Loctite the bolt too. I'm thinking the bolt torque I raised to 220-250 ft lbs instead of what spec was.
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bsallis180 View Drop Down
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Joined: 29 Jul 2013
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Points: 209 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bsallis180 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 10:43am
does a fluid damper wear out? So you can adapted the 426 on 301, its not the same tapper right? 
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20494 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 11:05am
The dampener bolts to a HUB. The hub is tapered to fit the nose of the crankshaft. 301 and 426 crank noses are a different size.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20494 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 11:07am
Yes, they wear out. They can leak out the fluid and render them useless. They can also have the fluid solidify over thousands of hrs of use and render them useless too. Any dent to the dampener also makes them no good. I would never buy a used one and expect it to be good.
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bsallis180 View Drop Down
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Joined: 29 Jul 2013
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Points: 209 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bsallis180 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 6:12pm
That's what I figured thanks Doc.
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2wise4agm View Drop Down
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Joined: 19 Aug 2011
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Points: 538 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 2wise4agm Quote  Post ReplyReply Direct Link To This Post Posted: 13 Oct 2016 at 9:04pm
I have a fluid one made for a dt466 on my 301. It's mounted in kind of a weird way. I machined the front off of a 301 combine pulley and drilled and tapped it to accept the 466 fluid dampener.
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