(TCT) Timing Chain Tensioner
08-05-2009, 11:26 AM
#51
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im assuming those pressures are pressures by the oil pump, which is definitely not the pressure by the TCT which would be much lower.
In any case, i dont think the oil pressure has anything to do with it. Even if someone mills the head the pressure that the oil exerts on the piston is the same due to a minimal change in chamber length.
I think that it may only be the spring here at fault. One from the milling which reduces force and two from hysteresis which is the inherent loss of shape due to continuous loading.
As proof the one cure that you guys have found is the welding of the .25 in piston end. This does not change the pressure response but only the spring force.
In any case, i dont think the oil pressure has anything to do with it. Even if someone mills the head the pressure that the oil exerts on the piston is the same due to a minimal change in chamber length.
I think that it may only be the spring here at fault. One from the milling which reduces force and two from hysteresis which is the inherent loss of shape due to continuous loading.
As proof the one cure that you guys have found is the welding of the .25 in piston end. This does not change the pressure response but only the spring force.
08-05-2009, 01:23 PM
#53
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The principle of hydraulics:
The oil pump is the syringe.
The diameter of the tube is not a factor.
It does slow down the flow so you won't get full pressure instantaneously but after a short while there will be pressure.
The values are measured at the OEM pressure switch.
The small diamter spring inside the worm can carry about 5 kg, almost fuly compressed.
Its not fully compressed when installed.
The larger spring can carry way less.
IMO:
When the engine is running the oil pressure gives chain tension and creates an oil film for the worm to turn easily, in both directions.
When the block heats up the chain is becomming shorter (relatively) so the piston needs to be compressed, the oil film makes that possible.
The small diamter spring is helping to push the worm out when it can, when the chain stretches for example.
The big diamater spring is pushing the piston & worm out when the engine is off.
The oil pump is the syringe.
The diameter of the tube is not a factor.
It does slow down the flow so you won't get full pressure instantaneously but after a short while there will be pressure.
The values are measured at the OEM pressure switch.
The small diamter spring inside the worm can carry about 5 kg, almost fuly compressed.
Its not fully compressed when installed.
The larger spring can carry way less.
IMO:
When the engine is running the oil pressure gives chain tension and creates an oil film for the worm to turn easily, in both directions.
When the block heats up the chain is becomming shorter (relatively) so the piston needs to be compressed, the oil film makes that possible.
The small diamter spring is helping to push the worm out when it can, when the chain stretches for example.
The big diamater spring is pushing the piston & worm out when the engine is off.
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