Harmonic Damper Falling off
05-21-2013, 02:13 PM
#53
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05-21-2013, 02:21 PM
#55
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05-21-2013, 03:00 PM
#57
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Re: Harmonic Damper Falling off
i told u to check that crank. or even ur flywheel bolts. i bought both crank pulleys at the same time. mine got 3 hits at the track this weekend and numerous dyno hits ,and after urs flew off on sunday i checked mine immediately and it was fine.
not to mention this is ur very first hit on the car with a brand new pulley since the last one flew off and the new one flew right off also. really dont think is the pulley bro. let me know wat u find.
P.S. thank god i deep staged on that run because we wouldve been haulin *** down the track and it probably wouldve been worst.
not to mention this is ur very first hit on the car with a brand new pulley since the last one flew off and the new one flew right off also. really dont think is the pulley bro. let me know wat u find.
P.S. thank god i deep staged on that run because we wouldve been haulin *** down the track and it probably wouldve been worst.
05-21-2013, 03:58 PM
#58
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Re: Harmonic Damper Falling off
What he said and ......... I have personally spent many hours on this topic. Here are some things we learned after many thousands of dollars spent !!
Of course make sure your flywheel bolts don't bottom out.
If you are using locktite, do not smother it on, use sparingly ( you dont want it to come out of the hole and get in between the flywheel and crank)
Make sure mating surface is clean of any fluids including locktite
Make sure your flywheels is balanced and if at all possible balance the entire rotating assembly
Check run out of input shaft
Check all clutch components
On the H motor we never had an issue with an oem balancer or oem flywheel torque spec's until the 800-850 HP range. The H has a bigger stroke so I am pretty sure the B guys dont see issues until maybe 900/950 or more.
The problem is , torsional twist of the crank at high torque numbers = slight distortion of the flywheel very rapidly creating a very small "wiggle'' or flex. Oem torque spec's of flywheel bolts are good enough to deal with this wiggle on an H motor until about 800-850 with about a thousand different variables in between !
The ONLY way we found to help this is to torque the flywheel bolts in sequence to 130ft/lbs.
NOTE: we also run a semi custom ATI damper to keep down as much tosional twist as possible.
SHORT STORY If you are making more than 700hp, torque your flywheel bolts higher !!
Great Read http://www.atiracing.com/products/dampers/101/index.htm
Of course make sure your flywheel bolts don't bottom out.
If you are using locktite, do not smother it on, use sparingly ( you dont want it to come out of the hole and get in between the flywheel and crank)
Make sure mating surface is clean of any fluids including locktite
Make sure your flywheels is balanced and if at all possible balance the entire rotating assembly
Check run out of input shaft
Check all clutch components
On the H motor we never had an issue with an oem balancer or oem flywheel torque spec's until the 800-850 HP range. The H has a bigger stroke so I am pretty sure the B guys dont see issues until maybe 900/950 or more.
The problem is , torsional twist of the crank at high torque numbers = slight distortion of the flywheel very rapidly creating a very small "wiggle'' or flex. Oem torque spec's of flywheel bolts are good enough to deal with this wiggle on an H motor until about 800-850 with about a thousand different variables in between !
The ONLY way we found to help this is to torque the flywheel bolts in sequence to 130ft/lbs.
NOTE: we also run a semi custom ATI damper to keep down as much tosional twist as possible.
SHORT STORY If you are making more than 700hp, torque your flywheel bolts higher !!
Great Read http://www.atiracing.com/products/dampers/101/index.htm
05-21-2013, 04:06 PM
#59
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Re: Harmonic Damper Falling off
Sorry to here it max and morgan, but if the flywheel looks like it was wanting to weld itself to the crank, then flywheel bolt torque is your problem. Although massive tire shake is hard on everything, im sure most of the tire vibration was absorbed by the trans and clutch
05-21-2013, 04:14 PM
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Re: Harmonic Damper Falling off
05-21-2013, 04:49 PM
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Re: Harmonic Damper Falling off
And after snugging up those bolts with an impact gun I always back the bolts back off and then torque them to factory specs. I've been told im stupid and nuts for doing it my way but i've never had any back off. I have the baddest Mac and snap on impact tools that im sure could strip out and break off just about any bolt you put in front of them but thats just bad practice. Please stop using your impacts to be lazy.
Last edited by 1FASTHF; 05-21-2013 at 05:45 PM.
05-21-2013, 05:42 PM
#62
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Re: Harmonic Damper Falling off
Wow that's horrible. My ATI was so tight that Im almost positive I could have ran it at the track without a bolt holding it. To take off my ATI I needed a special tool and an impact gun. I would get rid of that fluidampner and go back to ATI. Also I would check your flywheel like people here are telling you. I had my OEM crank pulley come off one time but that was because It was finger tight and I forgot to torque it down. It never damaged anything.
05-21-2013, 07:50 PM
#63
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Re: Harmonic Damper Falling off
Wow that's horrible. My ATI was so tight that Im almost positive I could have ran it at the track without a bolt holding it. To take off my ATI I needed a special tool and an impact gun. I would get rid of that fluidampner and go back to ATI. Also I would check your flywheel like people here are telling you. I had my OEM crank pulley come off one time but that was because It was finger tight and I forgot to torque it down. It never damaged anything.
05-21-2013, 09:58 PM
#64
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Re: Harmonic Damper Falling off
Kind of an on topic question here... are you guys all running the "race" version ATI damper? Due to space the street version would suit my needs a little bit better but if the race version is that much more effective than I would rather use that one.
05-22-2013, 03:53 PM
#66
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Re: Harmonic Damper Falling off
05-22-2013, 06:48 PM
#67
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Re: Harmonic Damper Falling off
when you get a new damper, get a measurement from your crank snout and then call ati, to see which hub they have on the shelf that will give you the tightest fitment.
05-22-2013, 09:27 PM
#68
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Re: Harmonic Damper Falling off
All I've used is fluidampers and never had any issues. I always use old crank bolts and always use impact gun to tighten it. If ur kicking out a fluidamper then something is out of balance. Also be careful because ur oil pump isn't going to last like that.
05-22-2013, 09:52 PM
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Re: Harmonic Damper Falling off
Here are some pictures of damage that happened @ IFO Bakersfield. So now I have a RMA to ship back the dampner, we'll see what they'll do for me.
05-23-2013, 09:28 AM
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Re: Harmonic Damper Falling off
Thats fucked.
760 WHP street car (H22)
Comp twin... 100 FT LBS
OEM baalncer... 181 FT Lbs and red gel loctite.
No issues so far (NEW balancer and bolt)
760 WHP street car (H22)
Comp twin... 100 FT LBS
OEM baalncer... 181 FT Lbs and red gel loctite.
No issues so far (NEW balancer and bolt)
05-23-2013, 09:46 AM
#72
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Re: Harmonic Damper Falling off
cars faster than 10.99 require a sfi damper...
NHRA 1:2
"All classes, with the exception of Stock and E.T. cars slower than 10.99 seconds, harmonic balancer meeting SFI Spec 18.1 or solid metallic hub mandatory."
NHRA 1:2
"All classes, with the exception of Stock and E.T. cars slower than 10.99 seconds, harmonic balancer meeting SFI Spec 18.1 or solid metallic hub mandatory."
05-23-2013, 10:53 AM
#74
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Re: Harmonic Damper Falling off
so ifo is the only body of racing that we are into
my point is that nhra isnt the only thing we need to go off of or worry about when it comes to racing man.
not to mention that most of the rules are also geared around the bigger engine when it comes to safety as well.
my point is that nhra isnt the only thing we need to go off of or worry about when it comes to racing man.
not to mention that most of the rules are also geared around the bigger engine when it comes to safety as well.
05-23-2013, 11:15 AM
#75
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