Lighten Crank Pulley

[Johnthese]

so for auto trans,putting in a crank pulley on a stock engine is worthless??or just really slight gains?

[Pat10lim]

heard fr some that after a few mths the pulley will be quite noisy??? is it true?

[Kelpie]

heard fr some that after a few mths the pulley will be quite noisy??? is it true?

 

At least, I've not heard of mute LCP. The noise level actually varies from car to car. Usually, after 1st change of belt it is not noisy and the noise will peak in about 2-3 months time. Anyway, once inside cabin, where is the noise?

 

Regards,

[Vtim]

are you using Underdrive LCP　How many % undersize

 

I amd thinking of installing one in my ride

[Kelpie]

You beat me! . I'm not exactly sure about the dimension as it may varies between cars. What you can do is to check out the www.unorthodoxracing.com and see if there is one meant for your car model 1st.

 

Regards,

[Kiadaw]

Sorri bro, can I ask what is your ride?

[Ls430]

Hi all

 

I am about to book and change the crank pulley to a lighten aluminium 7075 one now. Many ppl say that a ride will feel more responsive. Jus wan to confirm this before I place my order.

 

Thanks

 

jemjem

 

by being light would that affect the balance and subject to potential crack

[Sss_man]

Hi

 

This is Daniel from Avantgarde Automotive Pte Ltd, we are the sole distributor for RPM lightweight crank pulley in Singapore. Vincent (RV) had called me this late afternoon regarding a complain from a WISH owner who had experienced abnormal engine vibration after installing the RPM racing pulley on the 16th MAR. The pulley has been confirmed defective, and we sincerely apologise for the matter. We have traced the batches of pulley (8 pcs of them) which was delivered on 13th FEB and Vincent responded immediately to offer checks for vehicles who had installed the LWP at RV.

 

Since the launch of the RPM LWP, we have retailed more than seven hundreds pcs of LWP, and till date we have received four complaints (all Mazda 3 models which had been replaced with new designs for the sensor plate), the WISH is the fifth. Once again, we apologise for any inconvenience caused and for any owner who has any enquiry, please call 6789 7088 during office hours or email to [email protected] Thank you.

 

Do you happen to supply the rpm lwcp for toyota wish to World Auto too? I've installed the rpm lwcp with harmonic damper about a week ago there. Guess that i'm a bit too late after going through this forum now.

 

Btw, is there any way to tell if whether the lwcp installed by world auto comes with a full rubber piece sandwich in between the pulley or just a stick on rubber ring? is there any peculiar serial number series which i should look out for on the packing box to differentiate between the earlier batches than the later ones?

 

So far everything seems fine on my wish accept a very faint whirring sound from the engine bay which i'm not so sure caused by either the rpm lwcp or a drop in stainless steel air filter which i've installed together. Sound only appear upon acceleration. Thanks

[Daniel_s]

Hi Sss-MAN,

 

Since the posting, we had carried out checks with all our dealers including World Auto, their pulleys are fine. As for the rubber ring issue, we have checked with the manufacturer and verfied that it was an EPDM stick on design (which is similar to OEM pulleys). As for the faint whirring sound, it is normal if you have install a high flow filter.

 

http://www.jtekt.co.jp/products/drive05.html

[Sss_man]

hi daniel, thanks for the assurance as i've just started to worried that if by chance i got a defective pulley installed, surely it would lead to engine problem. I guess ur right bout the whirring sound. Beside the sound, car behave normally only that it is so eager to sprint now after being mated with the lwcp.

[Tohto]

Sorry guys for digging out this old thread.

Just want to know from bros who had change to lighten crank pully, especially those had changed for more than 3 yrs on your ride, do you facing any problem on your engine?

[Kb27]

Your mileage varies. If you're lucky, you're be fine.

 

If not, you risk a breakdown either in power steering, if that's running off the crank pulley or just a simple aircon/alternator down.

 

Mine was apparently working well for 2 yrs, no visible cracks on the outside.

Until I did a timing belt change. After the mech put back the crank pulley and the belts, the motor wouldn't turn. At first, it was suspected my battery but it was not. The mech did some more adjustment and the motor finally can start.

 

What follows was a screeching noise when steering was turn to full lock.

 

Feeling uneased about everything, I decide 2 weeks later to put back oem pulley.

 

What I found was alarming. The lightened crank pulley had a deep score mark on the inside.

For some reason, it had make contact with a bulging ring on the engine block.

 

I think during the belt change, the mech must have bolted in a little more and caused the motor start problem, steering screeching problem.

 

Looking at the oe pulley, it had enough clearance but not the aftermarket one.

 

So you're taking a chance, a big risk.

 

I think I had enough of lightened crank pulley. How do you think an alum alloy can withstand the stress of the engine revolution for millions of times?

It will probably disintegrate some time.

[Vtim]

Sorry guys for digging out this old thread.

Just want to know from bros who had change to lighten crank pully, especially those had changed for more than 3 yrs on your ride, do you facing any problem on your engine?

 

This is what happen to mine, less than 3mths old.

 

[Vtim]

 

compare to the stock pulley

 

[Tohto]

Any damage to your engine when it break?

Edited August 19, 2009 by Tohto

[Vtim]

Any damage to your engine when it break?

 

no engine is fine, as it is either a non-interference engine in design or using timing chain internally, the external belts are mainly use to drive power steering, alternator & waterpump.

 

here is the story : http://www.mycarforum.com/index.php?showto...p;#entry2790371

[Qr25vet]

if u want it done properly...get a lightened crank pulley and balance it with the crank/flywheel together....but of course no one would wanna do that....

[Mikeyeo]

Sorry guys for digging out this old thread.

Just want to know from bros who had change to lighten crank pully, especially those had changed for more than 3 yrs on your ride, do you facing any problem on your engine?

 

 

Hi 'Tohto', I have an aftermarket lightweight crank pulley installed 3 years ago on one of my cars which I am still using. The replacement crank pulley is manufactured specifically for my car model and exactly the same as the OEM one except that it is very light.

 

After installing to the aftermarket lightweight crank pulley, I could instantly feel the fast pick-up and lightness of the car.

 

If you have intention to replace your OEM crank pulley to aftermarket lightweight crank pulley, it is very important to note that the latter must be of very strong and yet lightweight, same diameter, the grooves around the circumference and same thickness, the bolting holes must be the round type and not those with elongated holes.

 

Reason for the latter is that the lightweight crank pulley will tend to run out of position if the material used for the lightweight crank pulley is not of high quality. When the pulley is hot, it will cause expansion and contraction and will affect the original diameter.

 

This would ultimately cause the bolting positions to shift and the taut of the belts will be affected.

 

The other most important point to note is to stick to the original size and grooves around the circumferenc as the OEM pulley.