Light Crank Pulley

hi,
i too have been interested in the lightweight pulley as i intend to buy one, however having read in this thread, that the pulley could have a detrimental effect on the engine, i've since become reluctant to get one. My Question is however, if i install a lightened flywheel (Spoon) and also install a lightened pulley (Summit) will this be ok?...Will it still have a detrimental effect on the life of the engine?.

Also Yfin, for my dc2 vtir, i was quoted 320 to fit my flywheel and $70 EXTRA to install the pulley.
I'm not sure whether it would be cheaper or more expensive to fit the pulley on its own, But i am planning to fit both components at the same time.

What i can't understand is that theres all this camotion over the balance of the engine because they remove weight from the crank pulley.

Wouldn't removing weight from the flywheel have the same effect??

Cause really, both the flywheel and the crank pulley are connected to the crank shaft. If removing weight from the flywheel is ok why isn't it ok to remove weight from the crank pulley seein as tho they are both attached to the same thing???

lightweight pulleys are suppost to give you more torque.. so either way i think its should be effective in some way..

be careful of installing lightweight pulley, that means removing the harmonic balancer in your engine.

this can cause problem in the long run. the harmonic balancer is what causes all the weight. aftermarket pulley removes this plus using lighter material, the result is very light pulley. but missing an important 'ingredient'

Quote:

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Originally Posted by blk_shadow

be careful of installing lightweight pulley, that means removing the harmonic balancer in your engine.

this can cause problem in the long run. the harmonic balancer is what causes all the weight. aftermarket pulley removes this plus using lighter material, the result is very light pulley. but missing an important 'ingredient'

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Lol I think this was covered over the last 6 pages.....

I've used one made by GFB (Go Fast Bits). It was on a built and fully balanced motor though. So I had no troubles except running my water pumper harder than usual, thus wear.

For some motors (EJ20) they offer a full kit, maybe to offset the difference in size. So the motor can still spin in harmony.

The BFG item is much much smaller than the OEM part (SR20) and about 4-5kg lighter, maybe more!
This mod will be the same as doing a light flywheel. IMO not really worth it's coin unless everything else attached to the crank is balanced too (But we do it anyway, hehe).

The response derived from depressing the pedal is bliss.
Balanced motors FTW.

i c :zip: i didn't read the last 5 pages

Sorry for my stupidity but what makes it ok to remove weight from the fly wheel but not from the crank pulley?

Essentially they're both apart of the 'balanaced' crankshaft. Aren't they not?

Ive got a underdrive lightweight pulley on my car and have had it on for the past 40000kms and have not had an issue whatsoever. Gains were minimal though.

Quote:

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Originally Posted by JasonGilholme

Sorry for my stupidity but what makes it ok to remove weight from the fly wheel but not from the crank pulley?

Essentially they're both apart of the 'balanaced' crankshaft. Aren't they not?

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flywheel main objectives is to make the engine more stable during acceleration and decceleration.

On some motors, the crank pulley forms part of the crankshaft balancing. For the K series, it isn't and we can change pulleys as we wish. For your L series, I think you should find out first. Claymore said that it isn't, and if it is 100% confirmed, you can use a lightweight/underdrive pulley.

Quote:

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Originally Posted by claymore

It has been 100% confirmed over and over and over again. Just look at any Jazz/Fit sites starting with the online HONDA manual or any of several sites and Hondas own specs. The "L" series engines are INTERNALLY BALANCED and the pulley and/or flywheel, or flex plate are NOT PART OF THE BALANCE PACKAGE you could run the "L" series engines WITHOUT A PULLEY OR FLYWHEEL if you could fix a snout starter to it. Where did you "confirm it 100%" for your "K" series do the same for the "L" and then maybe you will be convinced.

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tsx.acurazine.org and k20a.org, both forums for the K-series. I know about the K, but not the L, that's why I don't dare to make a statement saying that the L does not rely on the pulley to be balanced. You're the L expert, if you say doesn't need the crank pulley, then I personally am inclined to believe that it shouldn't.

Even though there is claims of 100% etc , It would be interesting to follow any L series engines with light weight pulleys , over time to see IF there is any detrimental effects IE premature worn bearings etc.
IE when these engines are approaching 150-200,000ks