3SX or other non-OEM Custom Crank Pulley vibrations vs STOCK CRANK PULLEY smooth ???

[Zaroth]

YOU said it.

I said you don't replace a tire because the rubber gets old. And you don't. Tires are more than just rubber. You replace tires because the internal materials of the tire start to break down over time.

This is not the case with a pulley.

[MR2]

How old is your info?

[MR2]

From: John Lane [mailto:jlane@atiracing.com]
Sent: Thursday, 1 March 2012 4:36 AM
To: 'Michael Goodwin'
Subject: RE: ATi Dampeners for Mitsubishi 6g72/4/5

We have done custom dampers for that engine before you are looking around 850.00 for that damper

thank you,


John Lane
High HP sales manager
ATI Pro Mod crew chief
ATI Performance Products, Inc
6747 Whitestone Road
Baltimore, MD 21207
T: (410) 298-4343
F: (410) 298-3579
E: jlane@atiracing.com

Info from March 2012 add $100+ freight to AUS...

[MR2]

I said you don't replace a tire because the rubber gets old. And you don't. Tires are more than just rubber. You replace tires because the internal materials of the tire start to break down over time.

This is not the case with a pulley.

what exactly are the internal materials of the tyre?

[Zaroth]

How old is your info?

Tire Tech Information - Tire Aging – Part #2

Composed of steel belts, fabric plies and rubber compounds, the structural integrity of tires can degrade over an extended period of time as the result of chemical reaction within the rubber components, cyclic fatigue, abuse and road hazards.


Info from tirerack's website about tires aging.


Consumer Advisory on Aged Tired or Old Tires


A tire’s biggest foes are heat and oxygen. Over time, heat and oxygen break down a tire’s internal adhesive bond between the various layers of the tire’s internal laminate structure. This phenomenon is known as thermo-oxidative degradation.



Just a few off the top of the good search. Maybe you have some info I don't?

[Zaroth]

what exactly are the internal materials of the tyre?

HowStuffWorks "How Tires Work"

Here is a picture for you

[MR2]

lets go with, you replace Tires when they get old and leave it there?

[Zaroth]

I don't think anyone would refute that.

[mb7050]

there is a thread where this has been discussed in dept
http://www.3sgto.org/f13/destroying-...ulleys-63.html

Originally Posted by GTREVO View Post
I have been an early user of underdrive pulleys for many years now but only learnt about the detrimental effects of harmonics in the 4G63 engine not too long ago.

Try replacing bearings every single race like I do and you will know that the problem lies more than just tolerances and balancing. Have been building 2.0 on the DSM's for years now and the inherent bearing problems but thank god I nitrided my cranks ( thus am able to save cranks even with worn out mains) and 2.3 strokers in my Evo 6 which kills absolutely every single mains running only 6 to 7 passes on a single event. And both makes over 700WHP. Both have not run harmonic balancers and without balance shafts. And yes, the engine DOES make a little more vibration without the balance shafts. Funny thing is that while the main bearings are worn out badly, the conrod bearings remain perfect, almost untouched....

Have recently completed a race on the stroker and will remove the main bearings shortly to compare previously on which I have ran no dampener and this time with the dampener. This will at least confirm some how on the effects of the dampener.

Am only relating my experiences with the harmonics that are killing the engine and I don't think Mitsubishi would be putting one on if it didn't need one...

If I recall in one of many early forums some long time ago, even Bushur runs the stock dampener and doesn't use pulleys....
Read more at Lightweight crank pulleys? - evolutionm.net

Originally Posted by GTREVO View Post
Sorry for my late reply on my findings with my motor. Took it apart yesterday and the results are indeed very interesting. After running at over 8000 rpms on this stroker 2.3 motor and at 35 psi making 750 WHP/656 ft/ib WTQ, the bearings were in good reasonable condition and take note, this motor was run WITH a brand new stock Mitsubishi harmonic damper, crank pulley. I swear what I saw was surprising on what I revved the motor to ( 8500 rpm at times on the track). To add to the topic of balance shafts, this motor was built without balance shafts at all. The motor has seen done 40 dyno pulls and 10 full on passes down the track at the drags..

On my earlier post, I mentioned that the mains were worn right down to metal at a lower power level ( 670 WHP) and at less rpms at the track. This was on a brand new rebuilt motor with only 7 passes down the track and about 30 dyno pulls.

The above findings I found was on the same motor except that I replaced a set of brand new Clevites on it and the new Mitsubishi crank pulley and I was all ready to replace it again yesterday but hey there you go guys.... there is no dispute that the damper is there for a reason and for a very good reason in fact.... no more aluminium pulleys for me...
Read more at Lightweight crank pulleys? - evolutionm.net

Originally Posted by GTREVO View Post
The engine was pulled apart and I can say that my mixture was perfect since there was ZERO detonation and the pistons and combustion chamber was in perfect condition. I was running the 37R with this and there was no tune difference except that it was maybe .2 of an A/F leaner with the C16.

It's all in the crank damper. I have been using the aluminium underdrive pulleys for the last 10 years and I never had an engine failure with it but it now explains why I have less life span in my motors especially big power and boost is concerned.

It was Carmela from Jackson's that warned me against using a pulley. I took her word and there we go...the difference is obvious especially in a 2.3 stroker.
Read more at Lightweight crank pulleys? - evolutionm.net

Originally Posted by GTREVO View Post
Apparently the aftermarket dampers work at all rpms whereas the factory piece is more ' tuned ' at a higher rpm. This is what I was told and I have recently purchased a Fluidamper for my Evo and it is an awesome looking piece, bit heavy though but what the heck, it saves my motor...

There you go guys, guess most of us found out the hard way...even myself..
Read more at Lightweight crank pulleys? - evolutionm.net

Originally Posted by GTREVO View Post
Well, after building and playing around with DSM and Evo motor for years now, hate to say this but...I am still learning something new everyday...

Hope my findings will help lots more people out there by keeping their harmonic balancers instead of pulleys...
Read more at Lightweight crank pulleys? - evolutionm.net

How it works

http://www.bhjdynamics.com/downloads...amper_Info.pdf

[mb7050]

and the fluidampr prices start at 5000$ for this engine ..