Hi Frequency Vibration - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 25 (permalink) Old 10-20-04, 11:29 PM Thread Starter
Mercury Cougar Cool
 
leonbray's Avatar
 
Join Date: Jul 2003
Location: Brisbane Australia
Posts: 205
Hi Frequency Vibration

I had Pacemaker extractors and 2 1/2" system installed on the XG ute yesterday, re-using standard cat, and now I can feel a high frequency vibration through the car. The pipes don't appear to be rubbing on body work or chassis anywhere.

Anyone had a similar experience? Certainly be interested in a solution befor I take it back


Leon
68 Cougar XR7 (302W), 69 Cougar Convertible(302W), 70 Cougar XR7 Convertible (428CJ), 70 Cougar Eliminator (351 4V), 77 Cougar Villager Waggon, XY Ute (302W), XG Ute (IL6 XR6 replica)
leonbray is offline  
Sponsored Links
Advertisement
 
post #2 of 25 (permalink) Old 10-21-04, 03:58 AM
Registered User
 
Join Date: Oct 2004
Posts: 69
Re: Hi Frequency Vibration

Ok, now before you get defensive, im a sound engineer!


You cant "feel" High Freq.......

You can only feel Freq's lower than 200Hz............ Is it high pitch, does it sound low pitch ? you need to give a better idea of what your hearing
EFAug94 is offline  
post #3 of 25 (permalink) Old 10-21-04, 02:11 PM Thread Starter
Mercury Cougar Cool
 
leonbray's Avatar
 
Join Date: Jul 2003
Location: Brisbane Australia
Posts: 205
Re: Hi Frequency Vibration

Ok - it must be low frequency - feels like i'm sitting on a vibrator (now that should open up the discussion)

My guesses - exhaust mounts too hard or pipe wall too thin

Vibration can be felt from idle, through steering column pedals, door panels

There is no sound

Leon
68 Cougar XR7 (302W), 69 Cougar Convertible(302W), 70 Cougar XR7 Convertible (428CJ), 70 Cougar Eliminator (351 4V), 77 Cougar Villager Waggon, XY Ute (302W), XG Ute (IL6 XR6 replica)
leonbray is offline  
post #4 of 25 (permalink) Old 10-22-04, 05:20 PM
Registered User
 
Join Date: Oct 2004
Posts: 69
Re: Hi Frequency Vibration

Could be a exhaust leak at the muffler ?, they resonate around 100Hz...i.e low freq ?
EFAug94 is offline  
post #5 of 25 (permalink) Old 10-22-04, 05:35 PM
heard it before!
 
Join Date: Sep 2004
Posts: 872
Re: Hi Frequency Vibration

Quote:
Originally Posted by leonbray
I had Pacemaker extractors and 2 1/2" system installed on the XG ute yesterday, re-using standard cat, and now I can feel a high frequency vibration through the car. The pipes don't appear to be rubbing on body work or chassis anywhere.

Anyone had a similar experience? Certainly be interested in a solution befor I take it back
sorry this may be a little off topic i have same ute and planning similar.
did you get Cat cut to increase pipe size? how is the performance difference, how many mufflers and does it drone?
please post the solutin if/when you work out whats wrong thanx
deankdx is offline  
post #6 of 25 (permalink) Old 10-22-04, 05:41 PM
Registered User
 
Join Date: Feb 2003
Location: Sydney
Age: 56
Posts: 629
Re: Hi Frequency Vibration

Well I find that at a little under 2000rpm on slight load there is a zone where I can induce this sympathetic vibration of the door trims and or dash but it never lasts long enough to find or really bother me enough to do something about.

At idle though its fine even with the cam making the idle less smooth than it was.

AUII Auto wagon 4.0L InTech Pacemaker PH4480 extractors, 2.5" exhaust, JMM DEV3HL Cam Unichip 144rwkw. 1/4 mile 15.609sec@90.14mph
jonbays is offline  
post #7 of 25 (permalink) Old 10-22-04, 07:44 PM
RIP Sox.....
 
Soxx's Avatar
 
Join Date: Dec 2002
Location: Sydney
Age: 46
Posts: 2,580
Re: Hi Frequency Vibration

Quote:
Originally Posted by EFAug94
Ok, now before you get defensive, im a sound engineer!

You cant "feel" High Freq.......

You can only feel Freq's lower than 200Hz............ Is it high pitch, does it sound low pitch ? you need to give a better idea of what your hearing
Actually, whilst you are technically correct, 'leonbray' will certainly be able to 'feel' a high frequency 'vibration'.

You are using confusing audio terminology with auto terminology.

In audio, low frequencies are <100hz, mid frequencies are between 100hz an 5khz (very broadly speaking), and high frequencies are above 5khz.

However, in auto terminology, a 'low frequency' vibration could be caused by a wheel being out of balance, which will cause a thump-thump-thump kind of vibe, relatively slow in speed.

A high frequency vibration may be caused by an out of balance tailshaft or stuffed universal joints causing a very fine 'high frequency' vibration which feels much like vibrating mobile phone.

It's all in the context the word 'frequency' is being used in.

Rick.

4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?
Soxx is offline  
post #8 of 25 (permalink) Old 10-22-04, 10:11 PM
Registered User
 
Join Date: Oct 2004
Posts: 69
Re: Hi Frequency Vibration

You dick head Soxx,


Auto and audio both share the same freq's, that thump thump thump your talking about is still low freq (Hz). If your hear a high squeal, than it would be high freq.

Id love to learn more about your auto freq's and how they differ from audio freq's......fool
EFAug94 is offline  
post #9 of 25 (permalink) Old 10-22-04, 10:31 PM
Sandwich Connoisseur
 
donno's Avatar
 
Join Date: Jul 2003
Location: On Campus - University of QLD
Age: 31
Posts: 955
Re: Hi Frequency Vibration

Actually I'm with soxx. A mechanical vibration is naturally at a lower fequency then to a audio signal. A high frequency vibration in mechanical terms is completely different to an audio high pitched frequency. A vibration in a car is as a result to bumps in the road, the engine at revs etc. Any road car won't do over say 7000rpm, which has alot lower frequency then an audio signal, but is high in the terms of mechanical vibration. The signals are in different domains, therfore high and low for their respective domains are completely different frequencies, if you catch my drift. BTW, I'm doing 2nd year engineering, and this is from a subject dedicated to signals and systems

1993 ED Futura

I6, 5sp Factory Manual , Wade 1636, Pacemaker PH4480s, HF Cat, Cat-Back 2 1/2" Mandrel Bent Lukey Zorst, Car-puter, XR Front and AUII Clear Side Indicators.

Dull Alloy factory mags, ooo yeah.

Proud TQE Operator
donno is offline  
post #10 of 25 (permalink) Old 10-22-04, 10:44 PM
Jim Mock You Rock
 
Join Date: Jul 2004
Location: sYDNEY
Age: 47
Posts: 1,766
Re: Hi Frequency Vibration

Quote:
Originally Posted by EFAug94
**edited by xa coupe **

Hey ..everyone is entitled to their opinions but there is no need for bad language for you to convey your message.This is a discussion forum with a common goal to help each other .

Please leave that language outside the door ..

Last edited by russellw; 10-23-04 at 12:27 AM.
useless is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Inline 6 Tech


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
1997 Countor Steering Wheel Vibration @ Idle 1997_Contour Ford Contour | Ford Mondeo | Mercury Mystique | Ford Telstar 8 08-02-11 07:08 PM
Annoying Vibration 93 Bronco Trans | Driveline 0 08-27-04 04:02 PM
Vibration when decelerating. fairmont1998 Trans | Driveline 7 08-17-04 03:46 AM
Ford XE Violent Vibration! halo_djk Inline 6 Tech 8 05-15-04 05:05 AM
Damned vibration.. The Mighty XE Suspension | Wheels&Tires | Brakes 8 09-13-03 04:20 AM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome