Thoughts: Using an Alloy Crank Pulley (1JZ)

[gztwenty]

Any thoughts on using an alloy crank pulley to replace the old busted one. It also replaces the harmonic balancer. Here's a link: http://store.driftmotion.com/Static/...rankpulley.php

I've heard they're great, I've heard their okay but need a good balancer fo the 10 sec bracket (ANDRA rules), and I've heard people say they arent sure, and people the wouldnt touch one.

Any 1JZ gurus know more on the subject?
Anyone using one of these???

[Pure_In_Sanity]

I bought one of these a while back, due to space restrictions.
Never ended up using as i managed to get away with the stock balancer.

I've heard conflicting information, best to wait & see what the others say from experience.
It's not going to do the engine any good, the harmonic balancer is there for a reason. But has anyone actually experienced (first hand!) main bearing damage etc??
Drive belts are just consumables, they don't count!

Shoot me a pm if you want to buy one, i'll do it for less than half the price.
Just another paperweight sitting here.

Cheers
Phil

[gztwenty]

too late but thanks
my mate busted his crank pulley, so he borrowed mine (my 1J is out for upgrades) so we looked at the alloy replacement for his and was a good price to get 2 instead of just the one. not installed yet or tested. hmmm. dont want to bust a bearing

[oldeskewltoy]

http://www.vibratechtvd.com/VISCOUSTECH.htm

[gztwenty]

Read it all. but it doesnt seem clear cut. In the first paragraph it says it's a misconception, but then it says that it could be needed for high power high rpm uses....

[gianttomato]

I'd buy an ATI one.

[PlacentaJuan]

i have an ebay one that i have been using on my 2jz for over a year now.

i only used it because it was an emergency at the time but never bothered to change it.

to be honest i have not noticed any difference in power however did notice lower pump speeds at idle and will change it to a proper harmonic balancer next time i do a major service because i am scared of damaging the engine.

although toyota engines are fairly well balanced for a few extra kw increase that i can even feel i dont think its worth the risk, not for my daily driver anyway.

[gztwenty]

Yeah, I'm looking into getting an ATI one. Or a ROSS one.
Standard Toyota ones are $374pp.

[Shakotan_Aaron]

digging this thread up instead of making a new one..

im basically in the same position as gztwenty, i have a busted crank pulley (the rubber part has parted ways with the belt drive). could glue it back on but i dont like the sound of that.

after reading that website posted up before, it does indeed say 2 different thinks kind of.. but really didnt seem to answer the question.

its auto so im not really looking at an alloy pulley for the engine responce effect, just the price really (im a rather tight arse)..

[The Real Roadrunner]

its auto so im not really looking at an alloy pulley for the engine responce effect, just the price really (im a rather tight arse)..

Then a new stocker would probly suit you better, cheaper than an R&R to swap engines if something did go wrong and saves you wearing out belts aswell.

cheers
linden

[timbosaurus]

So a billet alloy pulley will potentially trash out your bearings, and wears your belts out? What are the advantages then?

Does it still cause this issue if dynamicallt balanced with the rest of the bottom end? I'm assuming so, because balancing wouldn't do much for harmonics.

[1JZ-Rolla]

So a billet alloy pulley will potentially trash out your bearings, and wears your belts out? What are the advantages then?

No, a properly designed billet alloy one (incorporating the damper section) will be perfect, but not cheap. Then again, I recall the OEM ones being over $300 anyway.

If you do go aftermarket, beware that some have a different outside diameter, and so require a longer/shorter belt (not a huge drama, but be aware anyway)

This is the Ross Tuffbond Metal Jacket one that I have:




Its two piece, and has a bonded torsional vibration damper. Also ANDRA/SFI approved if you're going down that path.

Cheers
Phil

[Shakotan_Aaron]

advantage of a alloy one is less spinning mass (same as putting a lightned flywheel on) and also a lot of them are under driven/larger diameter making the HP lost from accessories less.

one thing tho, how is it different from having a lightened flywheel? surely when an engine is balanced it is done without the front pulley?

as i said im a tight arse so when a new standard one is around $350+ and a alloy one can be got for around $50 kinda worth investigating. if i do have to spent the money then i will. i guess wearing belts out will depend on the quality of machining?



1jz-rolla, how much did that baby set you back??

[1JZ-Rolla]

advantage of a alloy one is less spinning mass (same as putting a lightned flywheel on) and also a lot of them are under driven/larger diameter making the HP lost from accessories less.

You mean smaller diameter in the case of a crank pulley?

one thing tho, how is it different from having a lightened flywheel? surely when an engine is balanced it is done without the front pulley?

Its purpose is not to "balance" the crank, this is done by the counterweights on the crank itself. A "harmonic balancer pulley" is actually a torsional vibration damper, tuned to counteract slight angular variations that the crank may experience as a result of individual cylinders firing. It is balanced on its own, separate from the crank, and does not incorporate any kind of counter balance in the case of the 1JZ

as i said im a tight arse so when a new standard one is around $350+ and a alloy one can be got for around $50 kinda worth investigating. if i do have to spent the money then i will. i guess wearing belts out will depend on the quality of machining?

Take the risk then. I'd be amazed if an aftermarket alloy one could even be produced from the correct grade of alloy for that price, so don't expect only your belts to wear, the pulley itself will also.

Nothing is cheap in the long run

[Shakotan_Aaron]

these a 2nd hand one for $40

new ones are around $70+shipping

"torsional vibration" is the crank bending as the cylinder fire??

*sigh* looks like i may have to let the moths out... hell i only paid like 800ish for the whole motor haha.

how much did that ross one set you back?