catastophic torsional vibration
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Joined: May 2005
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From: lebanon, pa, united states
catastrophic torsional vibration
Has anyone had any experience, or know of any tests done to see if a lightened flywheel with a lightened crank pulley will cause enough torsional vibration on the crank to break it?
From what I've heard the stock b series blocks are fairly weak, and tend to be more supported by the crank rather then supporting the crank. There are a lot of cheap under-drive, lightened crank pulleys out there that I'm sure are not properly balanced and add to the torsional vibration. Basically is it safe to run both or should you stick with just the flywheel.
Modified by hplssone at 4:42 AM 1/23/2008
From what I've heard the stock b series blocks are fairly weak, and tend to be more supported by the crank rather then supporting the crank. There are a lot of cheap under-drive, lightened crank pulleys out there that I'm sure are not properly balanced and add to the torsional vibration. Basically is it safe to run both or should you stick with just the flywheel.
Modified by hplssone at 4:42 AM 1/23/2008
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Joined: Apr 2007
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From: the beach, fl, usa
Re: catastophic torsional vibration (hplssone)
underdrive = bad atleast on the crank, would you want to underdrive your oil and water pumps? I wouldn't
Lighter is better, to a point. But if it isn't spun balanced you'll have more vibration, balance is key
if you go run a solid crank pulley one with out the rubber in it you'll have.. take a guese...
Thats right vibration
I would use the Fluidamper or similar pulley with your lightwieght flywheel. I would also call the manufacturer and find out if the flywheel is balanced. No cheap ebay crap.
If you do go to a solid pulley get the stock size one not the underdrive, why risk it
Lighter is better, to a point. But if it isn't spun balanced you'll have more vibration, balance is key
if you go run a solid crank pulley one with out the rubber in it you'll have.. take a guese...
Thats right vibration
I would use the Fluidamper or similar pulley with your lightwieght flywheel. I would also call the manufacturer and find out if the flywheel is balanced. No cheap ebay crap.
If you do go to a solid pulley get the stock size one not the underdrive, why risk it
Honda-Tech Member
Joined: Dec 2004
Posts: 228
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From: Bloomington, IN, USA
Re: catastophic torsional vibration (SkimN)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SkimN »</TD></TR><TR><TD CLASS="quote">underdrive = bad atleast on the crank, would you want to underdrive your oil and water pumps? I wouldn't
Lighter is better, to a point. But if it isn't spun balanced you'll have more vibration, balance is key
if you go run a solid crank pulley one with out the rubber in it you'll have.. take a guese...
Thats right vibration
I would use the Fluidamper or similar pulley with your lightwieght flywheel. I would also call the manufacturer and find out if the flywheel is balanced. No cheap ebay crap.
If you do go to a solid pulley get the stock size one not the underdrive, why risk it </TD></TR></TABLE>
underdrive pulleys do not affect the water pump or oil pump.. ! lightweight flywheel isn't going to affect much except your rpm rise and fall rate , you'll be fine with a stock pulley. and really the stock pulleys are NOT harmonic balancers as everyone seems to think..
Lighter is better, to a point. But if it isn't spun balanced you'll have more vibration, balance is key
if you go run a solid crank pulley one with out the rubber in it you'll have.. take a guese...
Thats right vibration
I would use the Fluidamper or similar pulley with your lightwieght flywheel. I would also call the manufacturer and find out if the flywheel is balanced. No cheap ebay crap.
If you do go to a solid pulley get the stock size one not the underdrive, why risk it </TD></TR></TABLE>
underdrive pulleys do not affect the water pump or oil pump.. ! lightweight flywheel isn't going to affect much except your rpm rise and fall rate , you'll be fine with a stock pulley. and really the stock pulleys are NOT harmonic balancers as everyone seems to think..
Honda-Tech Member
Joined: Mar 2006
Posts: 2,062
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From: Columbus, OH
Re: catastophic torsional vibration (b20vtechb)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20vtechb »</TD></TR><TR><TD CLASS="quote">the stock pulleys are NOT harmonic balancers as everyone seems to think..</TD></TR></TABLE>
Some are, and some aren't. It depends on the engine's harmonics.
Whatever the case, it's better to be safe than sorry. Use a unit from Fluidampr, ATI, or something similar. If a Honda engineer comes on and says that their crank pulleys are designed just to reduce NVH and not torsional vibration, then you can say "I told you so".
Some are, and some aren't. It depends on the engine's harmonics.
Whatever the case, it's better to be safe than sorry. Use a unit from Fluidampr, ATI, or something similar. If a Honda engineer comes on and says that their crank pulleys are designed just to reduce NVH and not torsional vibration, then you can say "I told you so".
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