Bad Idle Part 1 *FIXED,MUST READ * New 5.0 Discovery
09-17-2007, 01:38 PM
#11
3rd Gear Member
Join Date: Aug 2007
Location: SC
Posts: 665
RE: Bad Idle *FIXED * New Discovery
my car only has 30 k on the engine and the dam thing is wobbling already .. im changing it this weekend .. nothing crazy stock replacement ford racing even though in another 30 k ill be saying i should have gotten that friggen fluid dampner lol
09-17-2007, 03:19 PM
#12
5th Gear Member
Thread Starter
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
RE: Bad Idle *FIXED,MUST READ * New 5.0 Discovery
Rubber VS Silicone Fluid
Critical harmonic vibrations occur numerous times in a engine’s operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency.
In the case of a stock rubber damper, it is tuned for a factory engine’s critical harmonic vibrations.
If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components.
Dampers also create heat while they work, and rubber is a poor dissipator of heat.
This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage
Critical harmonic vibrations occur numerous times in a engine’s operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency.
In the case of a stock rubber damper, it is tuned for a factory engine’s critical harmonic vibrations.
If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components.
Dampers also create heat while they work, and rubber is a poor dissipator of heat.
This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage
09-17-2007, 03:26 PM
#13
6th Gear Member
Join Date: Jul 2006
Location: San Diego, CA
Posts: 6,882
RE: Bad Idle *FIXED,MUST READ * New 5.0 Discovery
ORIGINAL: aode06
Rubber VS Silicone Fluid
Critical harmonic vibrations occur numerous times in a engine’s operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency.
In the case of a stock rubber damper, it is tuned for a factory engine’s critical harmonic vibrations.
If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components.
Dampers also create heat while they work, and rubber is a poor dissipator of heat.
This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage
.
Rubber VS Silicone Fluid
Critical harmonic vibrations occur numerous times in a engine’s operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency.
In the case of a stock rubber damper, it is tuned for a factory engine’s critical harmonic vibrations.
If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components.
Dampers also create heat while they work, and rubber is a poor dissipator of heat.
This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage
.
09-26-2007, 07:46 PM
#18
5th Gear Member
Thread Starter
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
RE: Bad Idle *FIXED,MUST READ * New 5.0 Discovery
also you can see if your harmonic balancer can slip from the rubber, by putting both hands on it and trying to move the dampner left and right
