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  #1  
Old 30-10-2015, 08:11 PM
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Default TD42 harmonic ballancer

Hi All... Researching the power upgrades of the TD42ti i came across the issue of snapped cranks.. the main fix it tip people suggest is replacing the flywheel with a lighter one(possibly aluminium)... Apparently this will adsorb the harmonics transferred through the crank from the firing of each cylinder. Isnt this what a harmonic balancer is designed to do? So rather than spending close to $1K on a lightened fly wheel.. Is there not an after market Harmonic balancer that can help with this issue?
Any responce would be appreciated.
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Old 30-10-2015, 09:00 PM
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Quote:
Originally Posted by ducatimad View Post
Hi All... Researching the power upgrades of the TD42ti i came across the issue of snapped cranks.. the main fix it tip people suggest is replacing the flywheel with a lighter one(possibly aluminium)... Apparently this will adsorb the harmonics transferred through the crank from the firing of each cylinder. Isnt this what a harmonic balancer is designed to do? So rather than spending close to $1K on a lightened fly wheel.. Is there not an after market Harmonic balancer that can help with this issue?
Any responce would be appreciated.
I think UFI are doing them....
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Old 30-10-2015, 09:03 PM
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Harmonic dampener is what you are chasing. UFI i believe do quite good one for TD42s.
While im no full bottle on the whole harmonic issue, it seems that people that have hardened flywheels seem to be snapping cranks a little more frequently.
If you are upgrade power at some stage you will need to do the clutch perhaps lighten and balance the factory flywheel and smash on a UFI dampener.


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Old 30-10-2015, 10:01 PM
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Quote:
Originally Posted by ducatimad View Post
Hi All... Researching the power upgrades of the TD42ti i came across the issue of snapped cranks.. the main fix it tip people suggest is replacing the flywheel with a lighter one(possibly aluminium)... Apparently this will adsorb the harmonics transferred through the crank from the firing of each cylinder. Isnt this what a harmonic balancer is designed to do? So rather than spending close to $1K on a lightened fly wheel.. Is there not an after market Harmonic balancer that can help with this issue?
Any responce would be appreciated.
Yep UFI harmonic damper $1500 I think plus couple of mods
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Old 30-10-2015, 11:12 PM
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Originally Posted by Bothe View Post
it seems that people that have hardened flywheels seem to be snapping cranks a little more frequently.
What's a hardened flywheel?

Cheers,
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Old 30-10-2015, 11:14 PM
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One with high carbon content such as supplied in viper kit and so forth.

May be other factors at play, as i said im not full bottle on the whole subject, and this is about all my knowledge on the subject.
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Old 30-10-2015, 11:21 PM
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Pretty sure it was because their original ones weren't balanced
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Old 31-10-2015, 12:29 AM
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That probably contributed also but the harder steel reflects more harmonic vibration than a softer compound, such as mild steel or aluminum.

I recommend that you PM oldmav or ToughDiesels on here as they both have extensive knowledge on the subject and could point you in the right direction.
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Old 31-10-2015, 01:45 AM
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Quote:
Originally Posted by Bothe View Post
One with high carbon content such as supplied in viper kit and so forth.

May be other factors at play, as i said im not full bottle on the whole subject, and this is about all my knowledge on the subject.
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OK. I thought the issue with the Viper flywheel was that it is heavier than standard, didn't realise the hardness was a factor.

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Old 31-10-2015, 08:04 AM
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Yea mate like i said im not full bottle. That is just somthing that i have observed.

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Old 31-10-2015, 12:57 PM
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Far out !!(through want of a better phrase) $1500 for a harmonic ballancer? i now know why people f___ with the flywheel.. These crank failures? Are they the late model motors(TD42 TI) or earlier NA models?
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Old 31-10-2015, 03:19 PM
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Cheap compared to new engine

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Old 31-10-2015, 03:21 PM
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Originally Posted by ducatimad View Post
Far out !!(through want of a better phrase) $1500 for a harmonic ballancer? i now know why people f___ with the flywheel.. These crank failures? Are they the late model motors(TD42 TI) or earlier NA models?
No it's a Harmonic Damper. ATI
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Old 31-10-2015, 04:50 PM
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It kinda makes me laugh when people don't blink a eyelid at spending 6, 9, or even 12k or more on their truck to get it to move .
But then think spending a couple of grand to help it stay together after tripling it's power is like giving away there first born .lollollol.

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Last edited by boosted6; 31-10-2015 at 05:46 PM.
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Old 01-11-2015, 10:44 PM
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Yeah.. point taken mate.. But $1500 for a harmonic? Id expect $600 maybe $700..
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Old 01-11-2015, 10:48 PM
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Originally Posted by ducatimad View Post
Yeah.. point taken mate.. But $1500 for a harmonic? Id expect $600 maybe $700..
$1500 for new crank plus labour and other bits ?
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