Harmonic Damper Operating Temperature
05-14-2008, 09:32 AM
#1
Le Mans Master
Thread Starter
Harmonic Damper Operating Temperature
Has anyone taken temperature readings of the inertia ring on the
harmonic damper of an SBC used for track events? What values were
observed and were any measures taken to duct air toward the damper?
Thanks,
Ken R.
.
harmonic damper of an SBC used for track events? What values were
observed and were any measures taken to duct air toward the damper?
Thanks,
Ken R.
.
05-14-2008, 09:40 AM
#2
Team Owner
Member Since: Mar 2001
Location: Virginia Beach
Posts: 25,889
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CI 3-5-6-7-8 Veteran
Interesting... I've never done any. However, I took the time to install a keyed ATI superdamper when I put my cam in. The part is lightyears better than the stock one and I have absolutely zero blancer wobble. It's a 10% underdrive unit as ATI couldn't achieve their dampening requirements with anything smaller.
As for air flow... DRM showed me a way to cut the shroud out to promote flow through the radiator.
As for air flow... DRM showed me a way to cut the shroud out to promote flow through the radiator.
05-14-2008, 03:10 PM
#3
Melting Slicks
I have about 25 items on my track chart for temp readings, but thats one item not on there and never though much of. Why do you need or would like to know temps there?
I also opened my radiator mount as much as possible. I made wheel well openings that improved cooling for the engine, brakes and wheels too.
I also opened my radiator mount as much as possible. I made wheel well openings that improved cooling for the engine, brakes and wheels too.
05-14-2008, 05:09 PM
#4
Le Mans Master
Thread Starter
A harmonic damper does work. Generally when work is done, heat is a
by-product.
It seems possible that heat might change operating characteristics of
the elastomer ring that joins the inertia ring to the hub of OEM-style
dampers. Maybe heat also influences the operation of other styles
of dampers like the ATI, Fluidampr and TCI designs?
Just curious whether damper temperature has been studied here.
(Regarding the practice of cutting openings in radiator shrouds. Tom
DeWitt's shrouds take this a step further in a way that promises to
help retain effectiveness of the fans at low speed.)
.
by-product.
It seems possible that heat might change operating characteristics of
the elastomer ring that joins the inertia ring to the hub of OEM-style
dampers. Maybe heat also influences the operation of other styles
of dampers like the ATI, Fluidampr and TCI designs?
Just curious whether damper temperature has been studied here.
(Regarding the practice of cutting openings in radiator shrouds. Tom
DeWitt's shrouds take this a step further in a way that promises to
help retain effectiveness of the fans at low speed.)
.
05-14-2008, 07:03 PM
#5
Former Vendor
A harmonic damper does work. Generally when work is done, heat is a
by-product.
It seems possible that heat might change operating characteristics of
the elastomer ring that joins the inertia ring to the hub of OEM-style
dampers. Maybe heat also influences the operation of other styles
of dampers like the ATI, Fluidampr and TCI designs?
Just curious whether damper temperature has been studied here.
(Regarding the practice of cutting openings in radiator shrouds. Tom
DeWitt's shrouds take this a step further in a way that promises to
help retain effectiveness of the fans at low speed.)
.
by-product.
It seems possible that heat might change operating characteristics of
the elastomer ring that joins the inertia ring to the hub of OEM-style
dampers. Maybe heat also influences the operation of other styles
of dampers like the ATI, Fluidampr and TCI designs?
Just curious whether damper temperature has been studied here.
(Regarding the practice of cutting openings in radiator shrouds. Tom
DeWitt's shrouds take this a step further in a way that promises to
help retain effectiveness of the fans at low speed.)
.
That is why we drive fast!!!
Randy
05-14-2008, 09:31 PM
#6
Team Owner
Member Since: Mar 2001
Location: Virginia Beach
Posts: 25,889
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Received 5 Likes
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CI 3-5-6-7-8 Veteran
I have zero issues at low speeds. I put over 10k on my car last year with the radiator shroud cut like that, zero increase in temps at idle or in stop/go traffic.
05-15-2008, 01:10 PM
#7
Le Mans Master
Thread Starter
Thanks for the replies. I know several folks here run modified engine
combinations above OEM redlines for extended sessions on track in
warm temperatures (seeing high water and oil temps). I was merely
curious whether any of them had taken notice of the damper?
If someone were to take a moment to check during their outings this
season, it would be interesting to see what values are observed after
lapping sessions, together with info about coolant/oil/ambiant temps.
Further food for thought regarding harmonic damper temperature
combinations above OEM redlines for extended sessions on track in
warm temperatures (seeing high water and oil temps). I was merely
curious whether any of them had taken notice of the damper?
If someone were to take a moment to check during their outings this
season, it would be interesting to see what values are observed after
lapping sessions, together with info about coolant/oil/ambiant temps.
Further food for thought regarding harmonic damper temperature
The Dangers of Power Pulleys and
Understanding the Harmonic Damper
by: Steve Dinan
Harmonic Dampers
Crankshaft failure can be prevented by mounting some form of vibration
damper at the front end of the crankshaft that is capable of absorbing
and dissipating the majority of the vibratory energy. Once absorbed by
the damper the energy is released in the form of heat, making adequate
cooling a necessity. This heat dissipation was visibly essential in Tom
Milner's PTG racing M3 which channeled air from the brake ducts to the
harmonic damper, in order to keep the damper at optimal operating
temperatures.
Influences of Torsional Damper Temperature and Vibration Amplitude
on the Three-Dimensional Vibrations of the Crankshaft- Cylinder Block
System Under Firing Conditions
Document Number: 1999-01-1775 (May 1999)
For the torsional damper, the influences of the damper temperature
and the damper vibration amplitude on the damper vibration behavior
were investigated by a series of shaker tests in a thermostatic chamber.
Dynamic Testing and Evaluation of the Torsional Vibration Absorber
Document Number: 942519 (December 1994)
The paper investigates the effectiveness of the TVA in comparison to
the traditional tuned damper and to a viscous damper. The comparisons
are conducted both in controlled dynamometer testing and in field tests
on two V-8 motors modified for drag racing.
A Practical Treatise on Engine Crankshaft Torsional Vibration Control
Document Number: 790763 (February 1979)
...providing a general overview on the characteristics of vibration
damping, and related technology
Understanding the Harmonic Damper
by: Steve Dinan
Harmonic Dampers
Crankshaft failure can be prevented by mounting some form of vibration
damper at the front end of the crankshaft that is capable of absorbing
and dissipating the majority of the vibratory energy. Once absorbed by
the damper the energy is released in the form of heat, making adequate
cooling a necessity. This heat dissipation was visibly essential in Tom
Milner's PTG racing M3 which channeled air from the brake ducts to the
harmonic damper, in order to keep the damper at optimal operating
temperatures.
Influences of Torsional Damper Temperature and Vibration Amplitude
on the Three-Dimensional Vibrations of the Crankshaft- Cylinder Block
System Under Firing Conditions
Document Number: 1999-01-1775 (May 1999)
For the torsional damper, the influences of the damper temperature
and the damper vibration amplitude on the damper vibration behavior
were investigated by a series of shaker tests in a thermostatic chamber.
Dynamic Testing and Evaluation of the Torsional Vibration Absorber
Document Number: 942519 (December 1994)
The paper investigates the effectiveness of the TVA in comparison to
the traditional tuned damper and to a viscous damper. The comparisons
are conducted both in controlled dynamometer testing and in field tests
on two V-8 motors modified for drag racing.
A Practical Treatise on Engine Crankshaft Torsional Vibration Control
Document Number: 790763 (February 1979)
...providing a general overview on the characteristics of vibration
damping, and related technology
