Ah yes, I have the oem pulley here in my hand. Mitsubishi calls it a "crankshaft damper pulley". The whole assembly is black and looks like one solid piece.

Hmmm. The inner hub that bolts to the crank is aluminum. The grooved pulley is steel or iron. Pulley and hub are separated by, and bonded together with, a thin hard rubber ring. So it is three parts.

I stand corrected.

 

Your correct but i thought the outer peice was also aluminum but i could be wrong

 

it's heavy and a magnet sticks to it, thats ferrous material

 

Makes you wonder. Some guys remove the balance shafts in these small Japanese engines. If that doesn't contribute to vibration damage, what harm can changing out our stock damper pulley do? I was talking about this with a Honda hotrodding guru, we were looking at the damper pulleys in a few engines he had out (those pulleys are constructed identically to ours), he hasn't seen any issues with replacing them.

However, when stock engines are designed to live reliably for decades, every little thing contributes.

 

I have read horror stories online regarding using lightweight pullies with no damping. Also saw some that advised against removing balance shafts in daily drivers. Resonance can be a female canine with sharp teeth.

 

2006 RA do you know: is our simple pulley damper design supposed to damp resonant vibration peaks at certain harmonics or does the thin rubber just absorb firing impulse shocks before they reach the belt-driven accessories? Or is it the opposite - does it separate accessory belt resonance from the crank?

As you probably know better than I, some vehicles have more massive and effective pulley damping systems. Maybe it's eliminating those type that causes problems.

Hey, I miss talking to you!

 

I dont know what they do.
The feeling is mutual.

 

A diesel and 3 cylinder will need the largest cause they ideal really rough, if u read through my past posts you will find the answer a few times to what u asked 2006 RA unless u want a second opinion.

Im just as sceptical about LWP without a damper, but i know tons of ppl that use them with no problems, and if u look hard enough there is a horror story related to every aftermarket mod

 

True that. None regarding the RA pulley though, as far as I've heard.

 

yeah maybe cause there is only two one is solid design so really should break the other is RRm and its so small its probably stronger then the oem

 

When would this bad boy be ready to be sent outttt? I understand there's a long way, just anxious and curious

 

Im at the point now were i just need to get alminum and machine it, parts should be ready by may but im only making 5, two for me crans wants one and you so there is one leftover

 

can't wait!

 

yeah im excited as well to try this out inital calculations show itll be benefical and even with a 25% "safty" im getting about 5hp gain so.

To add to the project i was talkign with my urethane friend (guy whoes doing my mounts) and he said that inserting a ring of urethane would not be to difficult, needs a primer on both surfaces and the urethane will stick to it jsut fine. Im goona see if his shop will help me out with this aspect of the project and you guys might be part of the first every light weight dampened crank pulley un less no one is itnerested casue it will increase my maching time and possible the cost of material by as much as double.

 

dependign on the price i'd take that "leftover"...
if i can get a RRM one use dfor cheaper i'll take the RRM one...
i'm HOPING with tax $ ill be able to do a clutch, trans rebuild and a few other things(UDP/LWP inlcuded), maybe front and rear solid mounts since the trans will be out already, and so should the mounts...