no harmonic dampener? - Page 2 - Ford Focus Forum, Ford Focus ST Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum > Ford Focus First Generation > ZETEC Performance (2000-2004)

ZETEC Performance (2000-2004) The place to chat about any 2.0L Zetec engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 08-03-2007, 10:49 AM   #11
iammaxwell
Focus Enthusiast
 
Join Date: Jul 2007
Fan#: 48973
Location: Phoenix
What I Drive: 2004 Silver SVT ZX5

Posts: 103
FF Reputation: 2 iammaxwell Good Standing Member
Buy-Sell-Trade Rating: (0)
you guys have pretty much summed up why a udp is a bad idea. i just thought id add my 2 cents. the rubber in the pulley is needed to prevent resonance. everything has a natural frequency, basically harmonic. and when you get two or more things with the same frequency together they amplify each other, this is resonance. so imagine, your engines internals have a frequency and your accesories each have a frequency. if at a certain rpm these frequencies match, then the force of their combined amplitudes are all put on your crank. unless of course you have a little strip of rubber to isolate the two.
iammaxwell is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 08-03-2007, 10:51 AM   #12
illinipo
Token Engin-nerd
 
illinipo's Avatar
 
Join Date: Aug 2006
Fan#: 37693
Location: Well wouldn't you like to know?, Not Listed
What I Drive: dirty wag; Party; Bavarian phallus

Posts: 3,408
FF Reputation: 272 illinipo Outstanding Standing Member illinipo Outstanding Standing Member illinipo Outstanding Standing Member
Buy-Sell-Trade Rating: (19)
^ exactly what I was trying to say, thanks for clearing that up :)
__________________
Quote:
Originally Posted by Dennis_Grant
Remember this list: Bilstein; Penske; Koni; Ohlins; Sachs; Dynamic Suspension.

Not on this list? Almost certainly crap.
SUV this!
illinipo is offline  
    Reply With Quote
Old 08-03-2007, 10:57 AM   #13
iammaxwell
Focus Enthusiast
 
Join Date: Jul 2007
Fan#: 48973
Location: Phoenix
What I Drive: 2004 Silver SVT ZX5

Posts: 103
FF Reputation: 2 iammaxwell Good Standing Member
Buy-Sell-Trade Rating: (0)
and as far as changing the balance of your engine. i have to agree with tom. with regular maintenance, yes you do still have wear but the bearings, rings, etc... should all wear evenly. so its like subtracting from both sides of an equation, as long as you take the same amount off of both sides it still equals.
iammaxwell is offline  
    Reply With Quote
Old 08-03-2007, 10:58 AM   #14
HyBalz
Focus Addict
 
HyBalz's Avatar
 
Join Date: Feb 2005
Fan#: 18573
Location: Pike Co, KY
What I Drive: 2000 Silver ZX3

Posts: 982
FF Reputation: 49 HyBalz Great Standing Member
Buy-Sell-Trade Rating: (14)
Well Tom, now I guess you know Who said that.
__________________
"I aim to misbehave"-Malcolm Reynolds
HyBalz is offline  
    Reply With Quote
Old 08-03-2007, 11:02 AM   #15
illinipo
Token Engin-nerd
 
illinipo's Avatar
 
Join Date: Aug 2006
Fan#: 37693
Location: Well wouldn't you like to know?, Not Listed
What I Drive: dirty wag; Party; Bavarian phallus

Posts: 3,408
FF Reputation: 272 illinipo Outstanding Standing Member illinipo Outstanding Standing Member illinipo Outstanding Standing Member
Buy-Sell-Trade Rating: (19)
Quote:
Originally Posted by iammaxwell View Post
and as far as changing the balance of your engine. i have to agree with tom. with regular maintenance, yes you do still have wear but the bearings, rings, etc... should all wear evenly. so its like subtracting from both sides of an equation, as long as you take the same amount off of both sides it still equals.
"should"

Still all in theory here, but look at that guy who had his cam snap in half the other day...If your crank happened to develop a defect due to uneven wear you can say bye-bye to your motor.

So in this respect, I guess there is a "chance" of failure as much as there is a chance of uneven engine wear. Which is a strong possibility, look at how many high-mileage motors have compression tests come out uneven.
__________________
Quote:
Originally Posted by Dennis_Grant
Remember this list: Bilstein; Penske; Koni; Ohlins; Sachs; Dynamic Suspension.

Not on this list? Almost certainly crap.
SUV this!
illinipo is offline  
    Reply With Quote
Old 08-03-2007, 11:03 AM   #16
MattZX3
Detailing Freak
 
MattZX3's Avatar
 
Join Date: Dec 2005
Fan#: 30258
Location: n/a, IN
What I Drive: 2014 ford

Posts: 348
Points 16,052, Level 81
Points: 16,052, Level: 81 Points: 16,052, Level: 81 Points: 16,052, Level: 81
Level Up 41% Completed
Level up: 41% Level up: 41% Level up: 41%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 23 MattZX3 Great Standing Member
Buy-Sell-Trade Rating: (4)
well, ive had an udp on my car for about 25k and no problems yet, and a friend has the crank and water pullies on his svt for about 50k, and no issues yet...

dont know how long it would take to see failure, but meh...

i thought it was just on the dura's that you couldnt do an udp on...
MattZX3 is offline  
    Reply With Quote
Old 08-03-2007, 11:06 AM   #17
K Dog
FF Affiliate
 
K Dog's Avatar
 
Join Date: May 2005
Fan#: 23554
Location: Chi-Town, IL
What I Drive: Car

Posts: 1,243
Points 15,260, Level 79
Points: 15,260, Level: 79 Points: 15,260, Level: 79 Points: 15,260, Level: 79
Level Up 82% Completed
Level up: 82% Level up: 82% Level up: 82%
Forum Activity 3%
Activity: 3% Activity: 3% Activity: 3%
FF Reputation: 10 K Dog Great Standing Member
Buy-Sell-Trade Rating: (19)
Quote:
Originally Posted by iammaxwell View Post
you guys have pretty much summed up why a udp is a bad idea. i just thought id add my 2 cents. the rubber in the pulley is needed to prevent resonance. everything has a natural frequency, basically harmonic. and when you get two or more things with the same frequency together they amplify each other, this is resonance. so imagine, your engines internals have a frequency and your accesories each have a frequency. if at a certain rpm these frequencies match, then the force of their combined amplitudes are all put on your crank. unless of course you have a little strip of rubber to isolate the two.

Your absolutely right. Its neccesary when you have a piece of low quality heavy cast iron. But not neccesary when you have a 9 ounce piece of precision machined aluminum.
K Dog is offline  
    Reply With Quote
Old 08-03-2007, 11:21 AM   #18
iammaxwell
Focus Enthusiast
 
Join Date: Jul 2007
Fan#: 48973
Location: Phoenix
What I Drive: 2004 Silver SVT ZX5

Posts: 103
FF Reputation: 2 iammaxwell Good Standing Member
Buy-Sell-Trade Rating: (0)
really its all a bunch of theories. if you run your car for 200k with a udp. awesome, enjoy your extra 1-2 hp. just for the effort and money there are more worthwhile mods.
iammaxwell is offline  
    Reply With Quote
Old 08-03-2007, 11:27 AM   #19
iammaxwell
Focus Enthusiast
 
Join Date: Jul 2007
Fan#: 48973
Location: Phoenix
What I Drive: 2004 Silver SVT ZX5

Posts: 103
FF Reputation: 2 iammaxwell Good Standing Member
Buy-Sell-Trade Rating: (0)
to illinipo

yes all engines wear a little unevenly in our imperfect world. but thats what makes maintenance so important. to keep that to a minimum. whats the maintenance record like for these high milage, uneven compression engines? or engines that wear so unevenly it causes failure?
iammaxwell is offline  
    Reply With Quote
Old 08-03-2007, 11:34 AM   #20
MattZX3
Detailing Freak
 
MattZX3's Avatar
 
Join Date: Dec 2005
Fan#: 30258
Location: n/a, IN
What I Drive: 2014 ford

Posts: 348
Points 16,052, Level 81
Points: 16,052, Level: 81 Points: 16,052, Level: 81 Points: 16,052, Level: 81
Level Up 41% Completed
Level up: 41% Level up: 41% Level up: 41%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 23 MattZX3 Great Standing Member
Buy-Sell-Trade Rating: (4)
Quote:
Originally Posted by iammaxwell View Post
to illinipo

yes all engines wear a little unevenly in our imperfect world. but thats what makes maintenance so important. to keep that to a minimum. whats the maintenance record like for these high milage, uneven compression engines? or engines that wear so unevenly it causes failure?
well, considering he has a wagon that is well over 100k on it, the motor is holding up just fine, he would be the guy to ask....
MattZX3 is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
UDP's rockthezx3 SVT Performance (2002-2004) 24 04-04-2007 01:31 PM
UDP Vote-Worth it or Worthless? TainOE ZETEC Performance (2000-2004) 65 01-13-2006 04:44 PM
UDP with Harmonic balancer QuickSilverSVT SVT Performance (2002-2004) 7 02-17-2005 04:59 PM
UDP with harmonic balancer preston77 SVT Performance (2002-2004) 28 01-07-2005 08:51 AM
underdrive pulley, dampener? whetman ZETEC Performance (2000-2004) 5 07-22-2004 09:12 AM


All times are GMT -5. The time now is 08:38 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.