Re: Fluid damper issues
[Re: AndyF]
#2783373
06/09/20 07:25 PM
06/09/20 07:25 PM
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Joined: Dec 2003
Posts: 22,732 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,732
Bitopia
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They are basically a mechanical tuning item, and each motor/application has different needs, each damper has a different optimum rpm range, some chose poorly. ATI online has a posted graph that displays this fairly well, IMO
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Fluid damper issues
[Re: cudaman1969]
#2783403
06/09/20 08:55 PM
06/09/20 08:55 PM
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Joined: Jan 2003
Posts: 31,078 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,078
Oregon
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I was waiting for you two guys to answer. 4.15 crank on a 4 speed street engine. I have all three, ATI, BHJ and FLUID DAMPER I like the FD because it’s thick like the stock one but recessed to use the 440 pully If you have a FD damper on hand that fits your application then I'd use it. It should work just fine with a 4.15 stroke street engine. I wouldn't use a FD on a circle track engine or a high winding drag engine but a stroker street engine should be just fine. FD are really designed for diesel engines and truck engines and such but they seem to work okay on passenger cars too. I think it is very important to have the rotating assembly properly balanced regardless of which damper you use.
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Re: Fluid damper issues
[Re: Sammy]
#2783455
06/09/20 10:54 PM
06/09/20 10:54 PM
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Joined: Jan 2004
Posts: 8,351 fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,351
fredericksburg,va
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Too much harmonics with Fluidamper.. Bearings always looked schmeary . Switched to ATI. Never an issue again. The bearings that came with the crank looked blackened but no other blemishes and the crank checked out great. Was in a race engine (world block). He was going to a 4.5. crank
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Re: Fluid damper issues
[Re: cudaman1969]
#2783491
06/10/20 01:11 AM
06/10/20 01:11 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I shifted as high as 8800 with a fluidamper on OE cranks and never broke a crank and the bearing looked perfect. They are not low RPM dampers.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Fluid damper issues
[Re: cudaman1969]
#2783515
06/10/20 06:19 AM
06/10/20 06:19 AM
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Joined: Nov 2011
Posts: 289 PA
Harry's Taxi 2
enthusiast
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enthusiast
Joined: Nov 2011
Posts: 289
PA
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I've had one since they first came out. 30yrs?......doesn't have the recess for the crank pulley. three different engines and never saw any negative bearing wear. stock stroke to 4.15 and max rpm of 7500. ATI's own graph even shows them to be the better choice up to a certain RPM. They are heavier than ATI's, but that might even be a plus.....although the initial rotating mass portion may be lighter than ATI's?
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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Re: Fluid damper issues
[Re: Harry's Taxi 2]
#2783976
06/11/20 07:47 AM
06/11/20 07:47 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I ran one on my race engine that was turning 8200 rpm and one still on my street rod thats a 7300 rpm 416 stroker.. I have never had any issue.. both of those are using a motor plate and I dont feel anything weird
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Re: Fluid damper issues
[Re: cudaman1969]
#2784159
06/11/20 02:54 PM
06/11/20 02:54 PM
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Joined: Jan 2003
Posts: 1,612 westerly, ri. usa
440lebaron
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,612
westerly, ri. usa
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20 plus years 4 different engines
all parts are sold as is, all parts are considered used no warranties or returns paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred site is not monitored 24/7 there might be a delay in response
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Re: Fluid damper issues
[Re: cudaman1969]
#2784174
06/11/20 03:26 PM
06/11/20 03:26 PM
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Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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RPM isn't directly a factor. The question is: will the engine operate at a higher RPM which includes another destructive harmonic order? If yes, the damper design is different. Mistakes from 50 years ago: Ford 289 210 hp owners install high-perf 271 hp and Cobra parts, including the cam. The 210 hp low-perf damper does nothing above 5,000, the 271 cam works above that. Wrong damper: broken crank.
Boffin Emeritus
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Re: Fluid damper issues
[Re: MR_P_BODY]
#2784211
06/11/20 04:44 PM
06/11/20 04:44 PM
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Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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The 271 has a different damper, which suppresses harmonics in the higher RPM range.
Boffin Emeritus
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Re: Fluid damper issues
[Re: Sammy]
#2784215
06/11/20 04:54 PM
06/11/20 04:54 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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And my vibration went away instantly when I went with ATI..........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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