little num Posted April 22, 2009 Share Posted April 22, 2009 as above, ive been reading about how the harmonic pulley stops the crank from cracking and failing, but has anybody on here fitted a solid pulley and never had a problem. Toyota want £220 with vat for the original 1 but ebay do a light alloy CNC machined 1 thats £50 but with no damper. Will this be a bad idea to buy 1 and fit it. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 22, 2009 Share Posted April 22, 2009 Yes. Quote Link to comment Share on other sites More sharing options...
supspower Posted April 22, 2009 Share Posted April 22, 2009 Agree with Chris, may cost more to get the OEM one but with the potential damage the ebay pulley will cause is just not worth the risk. Try Paul Whiffin he's usually cheaper than Toyota. He sorted me out with one top bloke Quote Link to comment Share on other sites More sharing options...
SteveR Posted April 22, 2009 Share Posted April 22, 2009 James, have you tried Steve Manley for a discount off that Toyota price? Quote Link to comment Share on other sites More sharing options...
Burna Posted April 22, 2009 Share Posted April 22, 2009 What discount are Westlands offering you James? Quote Link to comment Share on other sites More sharing options...
little num Posted April 22, 2009 Author Share Posted April 22, 2009 What discount are Westlands offering you James? They normally do me 28% but they guy who i see (gary) is away today so need to wait for himto price me, i will contact some traders on here to see what price's i get. i have ordered the alloy set that come's with power steering - alternator - water pump in alloy as they are solid anyway. Think im going to do the tipex trick and see how if its work out. Simons is wobbling so i thought id change mine as well. Quote Link to comment Share on other sites More sharing options...
Burna Posted April 22, 2009 Share Posted April 22, 2009 Think im going to do the tipex trick and see how if its work out. Good idea, you may not have a problem yet. Si has always had a wobble, I blame all the pies Quote Link to comment Share on other sites More sharing options...
legendswraith Posted April 22, 2009 Share Posted April 22, 2009 I take it the harmonic balancer is to remove the effect of the forces out of balance on the crank. Would that make it possible to use a solid pulley if it was dynamically balanced or would it require the balancing of the crank and pulley as a set? Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 22, 2009 Share Posted April 22, 2009 I take it the harmonic balancer is to remove the effect of the forces out of balance on the crank. Would that make it possible to use a solid pulley if it was dynamically balanced or would it require the balancing of the crank and pulley as a set? No. It's got nothing to do with rotational balance at all. Here's a link to a document that explains it all: "Torsional vibration damper" Quote Link to comment Share on other sites More sharing options...
legendswraith Posted April 22, 2009 Share Posted April 22, 2009 No link , but i understand what you mean makes sense thinking about it. Would like the link though if you can repost it Quote Link to comment Share on other sites More sharing options...
hiten55 Posted April 22, 2009 Share Posted April 22, 2009 Paul whiffin quoted me a top notch price - beat steve manley by miles Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 22, 2009 Share Posted April 22, 2009 No link , but i understand what you mean makes sense thinking about it. Would like the link though if you can repost it http://www.mkivsupra.net/vbb/showthread.php?t=35945 Quote Link to comment Share on other sites More sharing options...
legendswraith Posted April 23, 2009 Share Posted April 23, 2009 Cheers for that, basically from what i can gather if you do a full engine rebuild and can get the flywheel, crank and pulley balanced dynamically as a set then you could do without the harmonic dampening, but if you ever need to replace either the flywheel or the pulley you would have to resume the use of a harmonic balancer. So basically its safe to replace the other pulleys but leave the harmonic dampened pulley alone Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 23, 2009 Share Posted April 23, 2009 No, if you read the link then I'm afraid you misunderstood it. As I said before, the function of the crank pulley damper has absolutely nothing to do with rotational balance - or in fact balance of any other sort. Some people call these items "harmonic balancers" but that is a really misleading term. Quote Link to comment Share on other sites More sharing options...
bignum Posted April 23, 2009 Share Posted April 23, 2009 Its a vibration damper, the best explanation i found was here, http://en.wikipedia.org/wiki/Harmonic_balancer Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 23, 2009 Share Posted April 23, 2009 ...the best explanation i found was here, http://en.wikipedia.org/wiki/Harmonic_balancer None taken. Quote Link to comment Share on other sites More sharing options...
legendswraith Posted April 24, 2009 Share Posted April 24, 2009 Looked a bit more into this today (was very slow at work). Finally got the idea to gel, its not forces OOB that cause the torsional vibs its the energy imparted at an angle onto the crank that induces it (in a nutshell). However something i have been thinking about is the harmonic balancers are manufactured to work at a particular resonance and absorb the vibrations within a certain band. So when you go BPU or even further you change the torque curves and inputs on the crank which would have an effect on the point torsional resonance will occur. Assuming that resonance does occur at a different point when you change the torque loadings the harmonic balancer on the front of the crank is now useless as it resonates at a different time to when the crank does. I would think there would be some small benefit but the main reason the harmonic balancer is there would be lost. Also assuming that is correct then the aftermarket balancers (Titan on mine i think) would have to be manufactured to work at the right frequencies too. Admittedly this is conjecture from some reading etc i did today and when i talked to the guys who do dynamic balancing and said torsional vibration they looked at me as if i had told them i took a dump in their lunch boxes, so i can't get any input atm from our guys who do this kind of thing on the gas turbines. Would be interested if anyone has anymore information. Quote Link to comment Share on other sites More sharing options...
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