Benefit from crankshaft fulid dampner pulley?
#23
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Originally Posted by jonnylaw
wouldn't the stock elastometer rubber deteriorate over time as it is exposed to the elements and slowly dcrease its effectiveness for whatever purpose it is meant serve?
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Originally Posted by jonnylaw
I like the ati over the fluidampr but its pretty well known they are both great products. btw, both are slightly od (not ud) and weigh approx. .5 lbs over stock.
I understand there designed to supress vibrations etc, but since UD claim modest gains does the slight OD and heavier fluidampr and ati benefit the Z in its NA form gain wise. Im already aware of the vibration prevention at high rpms.
#25
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Originally Posted by jonnylaw
+1 Even DaveB, a known advocate against lw pulleys, admits there has not been a blown VQ engine/crank failure from a properly installed steel sleeved pulley like the UR:
I spoke with two separate machine shops that have seen crank pulleys damage motors all the time. On a motor like ours, there is concern about the lack of damping transfering vibrations not only into the crank, but also into the oil pump. my machine shop said they have seen it multiple times where guys running crank pulleys have premature oil pump failures.
It is a person's choice if they want to run one on their car. I have seen the damage first hand and will not run one ever again on any of my cars
#26
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Originally Posted by helldorado
I thought I'd throw this up here just for the sake of argument.
http://g35driver.com/forums/showthre...ing#post224754
http://g35driver.com/forums/showthre...ing#post224754
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Correctamundo!!!
Originally Posted by 06Track
Balancing the crank really has nothing to do with a Harmonic Damper (balancer).
The function is to absorb nasty frequencies or twisting of the crankshaft which
happens every time a combustion cycle occurs. It also helps the valve train
as the harmonics would be carried by the chain to the cams.
Also, bearing wear might get a benefit from it also...alot of pluses for
a balancer and no real negative effects. At the RPMs the VQ turns, it will
SURELY help!
The function is to absorb nasty frequencies or twisting of the crankshaft which
happens every time a combustion cycle occurs. It also helps the valve train
as the harmonics would be carried by the chain to the cams.
Also, bearing wear might get a benefit from it also...alot of pluses for
a balancer and no real negative effects. At the RPMs the VQ turns, it will
SURELY help!
http://us.st11.yimg.com/us.st.yimg.c...1990_163910938
We keep these in stock if anyone has a built motor or big boost, you need one as the stock crank pulley is not "tuned" to the different resonances that double or triple the power output creates.
#31
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And were you F/I or N/A when you experienced crank damage with the UR pulley?
I've never heard/seen a N/A bolt on Z/G experience crank failure from a properlly installed lightweight pulley with pressed in steel collar.
It's foolish to run a lightweight undampened pulley on boosted applications imho; I'm not denying that. Sounds like you learned your lesson.
I've never heard/seen a N/A bolt on Z/G experience crank failure from a properlly installed lightweight pulley with pressed in steel collar.
It's foolish to run a lightweight undampened pulley on boosted applications imho; I'm not denying that. Sounds like you learned your lesson.
Originally Posted by Zivman
you are in complete denial. I ran a UR pulley and had significant crank damage as a result. I broke a ringland in a piston and tore the motor down. I had the crank mag'd during the rebuild process and had stress cracks in the front cylinders resulting from the crank pulley. you could see the cracks walking rearward from the front of the motor. I was lucky I caught this before the crank completely let go and caused any damage.
I spoke with two separate machine shops that have seen crank pulleys damage motors all the time. On a motor like ours, there is concern about the lack of damping transfering vibrations not only into the crank, but also into the oil pump. my machine shop said they have seen it multiple times where guys running crank pulleys have premature oil pump failures.
It is a person's choice if they want to run one on their car. I have seen the damage first hand and will not run one ever again on any of my cars
I spoke with two separate machine shops that have seen crank pulleys damage motors all the time. On a motor like ours, there is concern about the lack of damping transfering vibrations not only into the crank, but also into the oil pump. my machine shop said they have seen it multiple times where guys running crank pulleys have premature oil pump failures.
It is a person's choice if they want to run one on their car. I have seen the damage first hand and will not run one ever again on any of my cars
#32
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Originally Posted by jonnylaw
And were you F/I or N/A when you experienced crank damage with the UR pulley?
I've never heard/seen a N/A bolt on Z/G experience crank failure from a properlly installed lightweight pulley with pressed in steel collar.
It's foolish to run a lightweight undampened pulley on boosted applications imho; I'm not denying that. Sounds like you learned your lesson.
I've never heard/seen a N/A bolt on Z/G experience crank failure from a properlly installed lightweight pulley with pressed in steel collar.
It's foolish to run a lightweight undampened pulley on boosted applications imho; I'm not denying that. Sounds like you learned your lesson.
edit:
The pulley was on from my N/A days. I didn't even really think about it when I had my motor done. It just transfered right over on the build.
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NO kidding...
Originally Posted by TruBluZ
That picture does not show what happened to the crankshaft when the pulley broke!
You guys wanna see the crank???
#35
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You know, it's funny. I'm in my garage right now, removing a UR UD pulley, and installing a Fluidampr. I liked the effect the UD pulley had when I was N/A, and while I normally can't feel any small HP/torue differences, the UD pulley did make a difference. However, now that I am F/I, I feel that the small (5-10) HP difference a UD pulley makes is just not worth the possible risk that an undampened UD pulley carries with it.
So, I am installing the nicely dampened Fluidampr, and will make up the 5-10 HP difference by turning up the boost half a PSI!
Dave
So, I am installing the nicely dampened Fluidampr, and will make up the 5-10 HP difference by turning up the boost half a PSI!
Dave
#36
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Originally Posted by RBlover69
Could anyone explain what are the effects of OD the vq opposed to UD. Im contemplating the fluid ampr.
I don't know why you would want a slightly heavier and OD fluidampr/ati pulley on a N/A unless you have a built engine and are revving really high for extended periods of time.
For F/I, I think it is almost a must for safety and reliability.
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Originally Posted by jonnylaw
OD only benefits those with superchargers as far as power increase from what I know.
I don't know why you would want a slightly heavier and OD fluidampr/ati pulley on a N/A unless you have a built engine and are revving really high for extended periods of time.
For F/I, I think it is almost a must for safety and reliability.
I don't know why you would want a slightly heavier and OD fluidampr/ati pulley on a N/A unless you have a built engine and are revving really high for extended periods of time.
For F/I, I think it is almost a must for safety and reliability.
#38
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Originally Posted by RBlover69
So your saying the OD properities pose negative effects for NA use.
I don't think you would notice much power diference in N/A form between the stock pulley and the ATI/Fuildampr units. Technically, since it is .5 lbs heavier and slightly od, It would result in a small power loss, but I dunno for sure. Maybe someone else could chime in.
To answer your question, imo, the positive effects would outweigh any negative effects, but I don't see the need for one, unless you are F/I or built high-revving N/A.
Last edited by jonnylaw; 02-29-2008 at 10:20 AM.
#39
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Originally Posted by Dave 90TT
You know, it's funny. I'm in my garage right now, removing a UR UD pulley, and installing a Fluidampr. I liked the effect the UD pulley had when I was N/A, and while I normally can't feel any small HP/torue differences, the UD pulley did make a difference. However, now that I am F/I, I feel that the small (5-10) HP difference a UD pulley makes is just not worth the possible risk that an undampened UD pulley carries with it.
So, I am installing the nicely dampened Fluidampr, and will make up the 5-10 HP difference by turning up the boost half a PSI!
Dave
So, I am installing the nicely dampened Fluidampr, and will make up the 5-10 HP difference by turning up the boost half a PSI!
Dave
Anyone want to buy a used Unorthodox Racing UD pulley set in black?
#40
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Originally Posted by Dave 90TT
Well, got it installed, and I can say that the engine just feels smoother,a nd quiter. Can't tell a hp difference, but then my butt dyno has never been able to tell 5-10 hp difference.
Anyone want to buy a used Unorthodox Racing UD pulley set in black?
Anyone want to buy a used Unorthodox Racing UD pulley set in black?
I feel the same way, maby it's in my head, but I felt it was smoother at idle!!?? I think you made a good choice Dave.
Kevin