Stillen U.D. pulleys help.

BGTV8 · 12-04-2014, 09:29 PM

You are going to get more vibration because you are removing the vibration damper .... you may not feel them because they are harmonics at higher rpm.

Whether it is a damper that is fluid filled or just a ring of cast iron, it is no longer present, so the damper effect is actually removed.

Whether this is going to affect your engine is the real issue. If you give the car a spanking every now and then, probably not, but drag it or track it with sustained hi-rpms, it might.

Many years ago, with a race engine based on a Traco-Olds 215, that was all internally balanced and with the crank damper deleted, we kept losing cranks and eventually solved the problem by using an ATL race damper, so I can confirm that revving the engine hard enough for long enough with cause failure.

DD road duties, it "should" last for as long as you own it ...

DEpointfive0 · 12-04-2014, 10:45 PM

Quote:

Originally Posted by BGTV8

You are going to get more vibration because you are removing the vibration damper .... you may not feel them because they are harmonics at higher rpm.

Whether it is a damper that is fluid filled or just a ring of cast iron, it is no longer present, so the damper effect is actually removed.

Whether this is going to affect your engine is the real issue. If you give the car a spanking every now and then, probably not, but drag it or track it with sustained hi-rpms, it might.

Many years ago, with a race engine based on a Traco-Olds 215, that was all internally balanced and with the crank damper deleted, we kept losing cranks and eventually solved the problem by using an ATL race damper, so I can confirm that revving the engine hard enough for long enough with cause failure.

DD road duties, it "should" last for as long as you own it ...

On THIS car, where is the dampener on the pulley?

BGTV8 · 12-04-2014, 11:40 PM

Quote:

Originally Posted by DEpointfive0

On THIS car, where is the dampener on the pulley?

Refer page 1679 of workshop manual - is integral/internal to the pulley ... refer snips attached. Also here:
http://workshop-manuals.com/nissan/3...iew/page_1679/

If you reckon there is no damper, knock yourself out ... my workshop manual reckons it is internal to the OEM pulley and with 20K in parts to go into my race engine, I will be fitting a Ross damper.

Like I said to the OP, maybe not necessary on a DD but my bus lives at 6500-7500rpm on regular track days.

Tread your own path ....

DEpointfive0 · 12-05-2014, 12:21 AM

Quote:

Originally Posted by BGTV8

Refer page 1679 of workshop manual - is integral/internal to the pulley ... refer snips attached. Also here:
Nissan and Datsun Workshop Manuals > 370Z V6-3.7L (VQ37VHR) (2010) > Engine, Cooling and Exhaust > Engine > Timing Components > Timing Chain > Component Information > Service and Repair > Exploded View > Page 1679

If you reckon there is no damper, knock yourself out ... my workshop manual reckons it is internal to the OEM pulley and with 20K in parts to go into my race engine, I will be fitting a Ross damper.

Like I said to the OP, maybe not necessary on a DD but my bus lives at 6500-7500rpm on regular track days.

Tread your own path ....

May I pose the question of... (And I don't mean to be an ásshole)

Does an aftermarket flywheel damage the car? After all the flywheel is on the other end of the crank, and weighs MUCH more than the crank pulley, and is much bigger, so even the slightest vibration has gotta make a bigger difference, no?

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12-04-2014, 09:29 PM	#1 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,516 Drives: 09 Nissan 370Z M6 Rep Power: 39975	You are going to get more vibration because you are removing the vibration damper .... you may not feel them because they are harmonics at higher rpm. Whether it is a damper that is fluid filled or just a ring of cast iron, it is no longer present, so the damper effect is actually removed. Whether this is going to affect your engine is the real issue. If you give the car a spanking every now and then, probably not, but drag it or track it with sustained hi-rpms, it might. Many years ago, with a race engine based on a Traco-Olds 215, that was all internally balanced and with the crank damper deleted, we kept losing cranks and eventually solved the problem by using an ATL race damper, so I can confirm that revving the engine hard enough for long enough with cause failure. DD road duties, it "should" last for as long as you own it ...