Posted By: Deepockets
who's got the best 440 dampner? - 08/01/10 02:47 PM
pro's con's on the best dampner for 528ci new build drag engine with jessel drive. some where i heard that some crankshaft company would not warrenty there crank is you used a certain brand. if thats so i dont think i'd go that way. please share your experiances
Posted By: Thumperdart
Re: who's got the best 440 dampner? - 08/01/10 04:33 PM
Posted By: CompWedgeEngines
Re: who's got the best 440 dampner? - 08/01/10 05:07 PM
ATI on all my power and higher end builds, Powerbond SFI for everyday bracket and street/strip builds.
ATI is proven stuff that is available, very adaptable and flat out works.
Posted By: Cab_Burge
Re: who's got the best 440 dampner? - 08/01/10 05:35 PM
I bought and used a Fluid Dampener on my 528, 4.375 stroke. I bought and used a ATI on my 512 (4.250 stroke) street motor and again when I switch cranks to increase the compression on the 4.3 stroke crank. I have now decided to only use ATI on all of my motors, steel or steel and aluminum
ATI all the way
Posted By: Deepockets
Re: who's got the best 440 dampner? - 08/01/10 06:04 PM
wow! sounds like ati wins the poll. it looks as if thats the way im going, thanks
Posted By: FastmOp
Re: who's got the best 440 dampner? - 08/01/10 06:30 PM
ATI here as well if your still on the fence.
It's lighter then my fluidamper under the workbench.
Posted By: cbarracuda
Re: who's got the best 440 dampner? - 08/01/10 10:00 PM
heres some good info from a crank company:
"2. DAMPERS WITH MOVING INERTIA WEIGHTS
A. Fluid, balls, springs, inertia rings with rubber O-Rings, etc. Can
you balance a wheel on your race car if the tires are flat???? How
can your rotating assembly be balanced if to quote one
manufacturer, “These units (Dampers) should not be on the crank
for balancing as the inertia weight may not be centered until the
engine starts.” NEWS FLASH!!!! Centrifugal force will always take
the inertia weight off center no matter what RPM. Your assembly
is never balanced. TELL TALE SIGN!!!! Metal transferred on nose
outside diameter and damper internal diameter . . . A fatigue crack
starts. SNAP!!!! The crank breaks"
Posted By: BradH
Re: who's got the best 440 dampner? - 08/02/10 02:52 PM
What's the deal w/ having to use spacers or whatever to make sure the pulleys are all aligned when using an ATI damper? I've never been sure exactly what the deal is w/ that...
Posted By: Al_Alguire
Re: who's got the best 440 dampner? - 08/02/10 03:09 PM
In case it has not sunk in ATI!
Posted By: Moparnut426
Re: who's got the best 440 dampner? - 08/02/10 03:24 PM
ATI, here aslo!
I was told by a well known engine builder that the ATI is the best damper because they are accurate throughout the rpm. Fluid Dampers are good for low RPM, Diesel engines accually. Some diesel mfgs run fluid dampers on their OEM engines. My machinist spun my old Fluid damper for my 360 build, and he told me it was wacky, would spinn up ok 1 time, then be way off the other time, then be only a little bit another time. I bought an OEM 340 damper for it, and it was nuts on. For my 408 build, I did a bunch of reserch, and the ATI is what I found was the most accurate.
Kasey
Posted By: an8sec70cuda
Re: who's got the best 440 dampner? - 08/02/10 04:37 PM
I have an ATI on my hemi and a Fluidampr on my wedge. No complaints about either one.
Posted By: Mopar_racer_99
Re: who's got the best 440 dampner? - 08/02/10 04:54 PM
I have had fluidampr and ATI, only problem with ATI it needs to be rebuilt every other year if making under 900 hp or every year if over, Elastomer breaks down. That is realworld results and also what ATI will tell you. John
Posted By: Anonymous
Re: who's got the best 440 dampner? - 08/02/10 06:39 PM
Don't leave out the part about ATI having several BB Mopar units--duh..which one? Different hub lengths --some will clear timing cover, some won't clear certain ones etc big PIA and the big deal with ATI is that they send them out from the factory too small on the ID--with all the different brands of cranks and the small side on the ID you usually have to have a shop HONE the indside for decent fit--yea they need to be tight but not THAT tight--measure before you go to install--if someone says they fit easy they had a China crank with the snout on the small side of spec..also ATI's run with no pulleys NEED BOLTS in the pulley holes per ATI instructions or they can come apart---READ the instructions and CALL them as they have enough choices to get you in the weeds with a quickie order.
Posted By: 70blackfish
Re: who's got the best 440 dampner? - 08/02/10 06:46 PM
ATI makes a 2 ring and 3 ring the 2 ring fits on without a spacer, no problem.
Posted By: dOrk !
Re: who's got the best 440 dampner? - 08/02/10 09:12 PM
I cast my vote ferrr ....an OEM stocker !!
That aftermarket stuff is uNnecessary ...uNless you are racing at a "sanctioned" event.
If there ...I vote furrr SFI Hughes. I got a brand-new one off eBay ferr 70 beans ... delivered to my door !
Posted By: DragtimeDodge
Re: who's got the best 440 dampner? - 08/02/10 10:08 PM
I just published a piece about this topic entitled "Crankshaft Vibration Dampers 101" at
The Dragtime News, along with other newly added items. Hope you like it.
Bob Beucler
DRAGTIME 1964 Dodge Polara
www.DragtimeNews.com
Posted By: dOrk !
Re: who's got the best 440 dampner? - 08/02/10 10:13 PM
ANY of you YOUNGSTERS remember what happened from coast-to-coast when NHRA first mandated a replacement part(the alum hub was the most popular item) for the OEM dampner?
Posted By: Old School
Re: who's got the best 440 dampner? - 08/02/10 10:17 PM
i have fluid dampners in all of my motors.never any problems.i was told the engine sees the fluid dampner weight as alot lighter than it's static weight.
Posted By: thehemikid
Re: who's got the best 440 dampner? - 08/02/10 11:14 PM
...Not a BB, but fwiw, an ATI went back on this P5 R4 358 before I sold it ~3 yrs ago.
