MRZ crank pulleys
New Member
Joined: 06-14-10
Posts: 78
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From: Los Angeles
The Damper 101 link above said something about once you start changing HP and RPMS, your stock damper wont be able to do its job properly anymore, especially if its "worn out". Is there really any definitive point that you would say the stock one shouldnt be counted on, aside from having issues as a result of it?
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Joined: 08-23-07
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From: Chandler AZ
I kinda wonder if the ati one would hinder performance rather than make It better... it looks to be heavier than the stocker even...
Not that it would work for my car since they don't have the correct rib setup...
Not that it would work for my car since they don't have the correct rib setup...
The Damper 101 link above said something about once you start changing HP and RPMS, your stock damper wont be able to do its job properly anymore, especially if its "worn out". Is there really any definitive point that you would say the stock one shouldnt be counted on, aside from having issues as a result of it?
ATI build 5 (what they call 6 rib) rib standard drive Ecotec dampers. In the very late '90's,Kurt Urban built 1000 horsepower turbo Ecotecs for GM at the W2W facility, in Michigan; they used ATI dampers. ATI 6 rib (what they call 8 rib) dampers for SC motors came much later, around 2006 iirc.
Lightweight crank pullies are fail, and I am thinking some of the folks that get them and use them, maybe dont have their cars long enough, or the motors dont run long enough, to see the destructive results.
Good that the OP went with ZZP's recommendation. I dont see any other reputable Ecotect engine builders jumping up to deal with the .net crowd. ZZP is a good choice I beleive.
Lightweight crank pullies are fail, and I am thinking some of the folks that get them and use them, maybe dont have their cars long enough, or the motors dont run long enough, to see the destructive results.
Good that the OP went with ZZP's recommendation. I dont see any other reputable Ecotect engine builders jumping up to deal with the .net crowd. ZZP is a good choice I beleive.
Last edited by Powell Race Parts; Dec 31, 2011 at 02:16 PM.
Senior Member
Joined: 08-23-07
Posts: 5,265
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From: Chandler AZ
ATI build 5 rib standard drive Ecotec dampers. In the very late '90's,Kurt Urban built 1000 horsepower turbo Ecotecs for GM at the W2W facility, in Michigan; they used ATI dampers. ATI 6 rib dampers for SC motors came much later, around 2006 iirc.
Lightweight crank pullies are fail, and I am thinking some of the folks that get them and use them, maybe dont have their cars long enough, or the motors dont run long enough, to see the destructive results.
Good that the OP went with ZZP's recommendation. I dont see any other reputable Ecotect engine builders jumping up to deal with the .net crowd. ZZP is a good choice I beleive.
Lightweight crank pullies are fail, and I am thinking some of the folks that get them and use them, maybe dont have their cars long enough, or the motors dont run long enough, to see the destructive results.
Good that the OP went with ZZP's recommendation. I dont see any other reputable Ecotect engine builders jumping up to deal with the .net crowd. ZZP is a good choice I beleive.
Also are there any specs on these as far as how much they weigh?
Are there any dyno results to prove these HELP performance?
Hi all,
what do you guys think of the crank pulleys sold by MRZ? Each one is about 2 pounds lighter than the stock one. Are they worth it?
5 ribs - Ecotec Lightweight Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - 5 ribs Ecotec Lightweight Crank - Car Performance Parts And Auto Accessories | MRZ Performance
5 ribs - Ecotec Underdrive Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - NA Ecotec UDP - Car Performance Parts And Auto Accessories | MRZ Performance
what do you guys think of the crank pulleys sold by MRZ? Each one is about 2 pounds lighter than the stock one. Are they worth it?
5 ribs - Ecotec Lightweight Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - 5 ribs Ecotec Lightweight Crank - Car Performance Parts And Auto Accessories | MRZ Performance
5 ribs - Ecotec Underdrive Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - NA Ecotec UDP - Car Performance Parts And Auto Accessories | MRZ Performance
Last edited by el_angelito; Jan 2, 2012 at 10:47 AM.
ATI build 5 rib standard drive Ecotec dampers. In the very late '90's,Kurt Urban built 1000 horsepower turbo Ecotecs for GM at the W2W facility, in Michigan; they used ATI dampers. ATI 6 rib dampers for SC motors came much later, around 2006 iirc.
Lightweight crank pullies are fail, and I am thinking some of the folks that get them and use them, maybe dont have their cars long enough, or the motors dont run long enough, to see the destructive results.
Good that the OP went with ZZP's recommendation. I dont see any other reputable Ecotect engine builders jumping up to deal with the .net crowd. ZZP is a good choice I beleive.
Lightweight crank pullies are fail, and I am thinking some of the folks that get them and use them, maybe dont have their cars long enough, or the motors dont run long enough, to see the destructive results.
Good that the OP went with ZZP's recommendation. I dont see any other reputable Ecotect engine builders jumping up to deal with the .net crowd. ZZP is a good choice I beleive.
ATI - Super DampersŽ for Serpentine Applications
8 rib for s/c ;6 ribs for na. weight, etc all there. try search next time
8 rib for s/c ;6 ribs for na. weight, etc all there. try search next time
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Joined: 08-23-07
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From: Chandler AZ
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Joined: 03-14-09
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From: Anna, TX
You really don't understand the point of a Harmonic Damper, do you?
The fact is people who know a whole lot about race engines and building motors in general have come in here saying you don't want to get rid of the dampeners, but still people will try and say that there is nothing wrong with doing it....
The fact is they are on there for a reason, to absorb the vibrations that would normally be transmitted into places in the motor you don't want vibrating at certain frequencies.
I really don't care though, I know I won't be putting one of these lightweight parts on my car. If people still want to use them and run a risk of damaging their motors for the 2hp they may or may not provide, I honestly couldn't care any less.
And why do you need your motor's to rev faster, to impress the other kids at the stoplight next to you?
Senior Member
Joined: 08-23-07
Posts: 5,265
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From: Chandler AZ
You really don't understand the point of a Harmonic Damper, do you?
The fact is people who know a whole lot about race engines and building motors in general have come in here saying you don't want to get rid of the dampeners, but still people will try and say that there is nothing wrong with doing it....
The fact is they are on there for a reason, to absorb the vibrations that would normally be transmitted into places in the motor you don't want vibrating at certain frequencies.
I really don't care though, I know I won't be putting one of these lightweight parts on my car. If people still want to use them and run a risk of damaging their motors for the 2hp they may or may not provide, I honestly couldn't care any less.
And why do you need your motor's to rev faster, to impress the other kids at the stoplight next to you?
The fact is people who know a whole lot about race engines and building motors in general have come in here saying you don't want to get rid of the dampeners, but still people will try and say that there is nothing wrong with doing it....
The fact is they are on there for a reason, to absorb the vibrations that would normally be transmitted into places in the motor you don't want vibrating at certain frequencies.
I really don't care though, I know I won't be putting one of these lightweight parts on my car. If people still want to use them and run a risk of damaging their motors for the 2hp they may or may not provide, I honestly couldn't care any less.
And why do you need your motor's to rev faster, to impress the other kids at the stoplight next to you?
I never said there's nothing wrong with doing it, I'm just posting my experience that nothing negative has happened to me or anyone I know.
Really it's there for a reason???! And I thought they would spend the money to put it on there for no reason at all..
Why do I need the motor to rev faster. Obviously you don't understand how a car performs. You have no idea how big of a difference that these make and until you actually have the experience that I have had with them I wouldn't expect you to understand, but then again I've also posted on here my experience which you have obviously failed to read. I love to impress the kids at the stoplight by revving my engine at them... really? are you 12?
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Joined: 03-14-09
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From: Anna, TX
You really dont understand that I understand the point of the harmonic damper do you?
I never said there's nothing wrong with doing it, I'm just posting my experience that nothing negative has happened to me or anyone I know.
Really it's there for a reason???! And I thought they would spend the money to put it on there for no reason at all..
Why do I need the motor to rev faster. Obviously you don't understand how a car performs. You have no idea how big of a difference that these make and until you actually have the experience that I have had with them I wouldn't expect you to understand, but then again I've also posted on here my experience which you have obviously failed to read. I love to impress the kids at the stoplight by revving my engine at them... really? are you 12?
I never said there's nothing wrong with doing it, I'm just posting my experience that nothing negative has happened to me or anyone I know.
Really it's there for a reason???! And I thought they would spend the money to put it on there for no reason at all..
Why do I need the motor to rev faster. Obviously you don't understand how a car performs. You have no idea how big of a difference that these make and until you actually have the experience that I have had with them I wouldn't expect you to understand, but then again I've also posted on here my experience which you have obviously failed to read. I love to impress the kids at the stoplight by revving my engine at them... really? are you 12?
Anyways, I made my points, I'm not getting into a childish argument. Sure, you haven't had problems, that's great. People also survive being shot, doesn't mean you should try it based on their opinion.
Thread Starter
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Joined: 11-11-10
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From: Yonkers, NY
bump! I know I've opened this thread 1 year ago, but I was wondering if in the past year somebody have installed them or at least one of them and share their impression. Originally I was asking about the 2 crank pulleys, but I am curious also about the alternator pulley
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Joined: 02-09-09
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From: Tejas
bump! I know I've opened this thread 1 year ago, but I was wondering if in the past year somebody have installed them or at least one of them and share their impression. Originally I was asking about the 2 crank pulleys, but I am curious also about the alternator pulley
I can't really make much more of a comment on it except that the engine runs well, and I have more than 10,000 miles on the engine/pulley so far.
Thread Starter
Senior Member
Joined: 11-11-10
Posts: 2,563
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From: Yonkers, NY
I've got one on my engine. It's a very nice unit. It requires a modified timing cover (which ZZP includes on their engine builds, but sells standalone too), as well as different length belt that you'll need to source yourself, being that it's a slightly different diameter. I can dig up information on the belt size that will work if you need. I posted up about it on my engine swap thread a while back.
I can't really make much more of a comment on it except that the engine runs well, and I have more than 10,000 miles on the engine/pulley so far.
I can't really make much more of a comment on it except that the engine runs well, and I have more than 10,000 miles on the engine/pulley so far.
5 ribs - Ecotec Lightweight Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - 5 ribs Ecotec Lightweight Crank - Car Performance Parts And Auto Accessories | MRZ Performance
5 ribs - Ecotec Underdrive Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - NA Ecotec UDP - Car Performance Parts And Auto Accessories | MRZ Performance
Lightweight Alternator Pulley - Ecotec 2.0LNF/2.2/2.4 - 5 ribs: by Make and Model - Chevrolet - Cobalt - Ecotec 5rib Alt pulley - Car Performance Parts And Auto Accessories | MRZ Performance