struikie
Veteran Member
can't say it's a huge difference...
might be a bit smoother but not significantly unfortunately...
JW
might be a bit smoother but not significantly unfortunately...
JW
Thanks for the feedback in any case.perhaps for the SMF guys it's a good thing...
for the DMF it's not THAT much of a benefit...
JW
Good adviceIt should be better for the crank and bearings at high rev's and high loads. Even then torsional vibes are not apparent to the operator, whether they are bad or not.
One trick I found for the big marine diesels is if damper is doing something, it gets warm. So shoot it with an IR gun and if it is way above ambient (hard to quantify, I know), it's doing some damping.
You will not "feel" torsional vibrations at the seat-of-the-pants. Reducing TV, while always a good thing, is not anything that you will notice subjectively. It's not a vibration like the second-order forces characteristic of an inline 4-cylinder engine that you can definitely influence by engine mounts or internal engine design measures (reducing reciprocating mass and/or altering the L/R ratio). You will know that TV is a problem by broken crankshafts.
TVs that concern engineers are on the free-end; the mode on the flywheel-end is also a form of TV and has more direct consequences on NVH (e.g. gearbox chatter, periodic twisting of the engine about its mounts due to reaction moments caused by torque fluctuations) and driving behavior and yes, heavier flywheels/DMFs help in that regard.TDIMEISTER,
Does the mass of the flywheel and balancer help reduce TV? Would having a heavier flywheel (or keeping the DMF) help reduce TV?
Ever put your diesel into 5th gear at 25mph and commanded full load? Usually the 1/2 order excitation frequency is in the range of the the drivetrain's 2nd natural frequency. I'm pretty certain you can feel the torsional vibrations under those circumstances, at the seat-of-your-pants, steering wheel, feet, dash, cupholder... etc.You will not "feel" torsional vibrations at the seat-of-the-pants.
I need to update this. Thanks to forum member Serge , the above is true. It seems some of the ALH 1.9 TDI motors do not have the correct offset and the teeth are off by approx 1.5mm.I took a bunch of photos and measurements before I bought one. The fluidamper is taller than factory by a small amount. The only thing it affects is the belt offset to the belt tensioner because they are so close togeather. So the solution was simple, I used one exhaust manifold heat shield per bolt hole and it was the perfect distance to space the tensioner away from the block. Absolutely 0 problems and belt lines up perfectly.
I need to update this. Thanks to forum member Serge , the above is true. It seems some of the ALH 1.9 TDI motors do not have the correct offset and the teeth are off by approx 1.5mm.
The part # affected is 038 105 243 . I am in talks with Fluidampr right now to explore 2 options:
1. To see if machining 1.5mm off the back end affects the structural integrity
2. If it does to see if we can get the next run of Fluidampr's to have a thicker front end so that we still have the same thickness but correct offset.
Will keep everyone updated.
Looks like the tdiclub is going to get a 1.9TDI specific pulley since it is just a simple operation.Curious what answer you say they will give to you...
Since they are doing this for ALH/ASV, can they make them at heavier weight like the unit Scott had years ago?Looks like the tdiclub is going to get a 1.9TDI specific pulley since it is just a simple operation.
So we have confirmed the 2.0 TDI - its a direct fit , just the 1.9 TDI ALH motors need to have a few thou removed off the mounting face.
No because then that requires a complete redesign of the product and that is a road I don't believe we will venture down.Since they are doing this for ALH/ASV, can they make them at heavier weight like the unit Scott had years ago?
IIRC the prototype one Scott had was ~9lbs.
Ah well. I didn't think it would be that complicated to add more mass but I guess they have a lengthy process of r & d and engineering approvals.No because then that requires a complete redesign of the product and that is a road I don't believe we will venture down.
Looks like your and everyone else's prayers might get answered.Ah well. I didn't think it would be that complicated to add more mass but I guess they have a lengthy process of r & d and engineering approvals.
Approx. ETA on the TDI-specific version?
thank you!I'm tossing my hat into the ring for buying one when these come to fruition.