Edited by P11 COV, 25 June 2013 - 07:58 PM.
Diagnose This Knocking Sound For Me Please.
Started by
P11 COV
, Jun 25 2013 07:57 PM
22 replies to this topic
#1
P11 COV
-
-
- 7,686 posts
Whipping Boy
- Gender:Male
- Location:MK
- Interests:Cars, Music, God, Family. Holidays.
Posted 25 June 2013 - 07:57 PM
For a while now (ever since my suspension refresh and new geo - not that I'm suggesting there is a connection) I have had a knocking noise from the left rear. I did wonder whether more camber or lower ride could be causing something to rub.
It only comes when I am cornering fairly sharply above 30 mph. Eg sharp right hander or roundabout.
It is only when on the power. Back off and it stops.
It is a fast knocking at about 300bpm.
First thoughts were wheel arch liner but I have completely removed that now and it's still there.
When the wheel arch was off I thought the airbox was loose so I have taken that off and it's still there.
Shortly after noticing it I did a track day at snetterton. It was particulary noticabke at the harpin. Throughout the day though it dissapeared. It came back after.
I am really stumped. I was wondering about rear brake caliber? Or engine mounts?
#2
Zoobeef
-
-
- 11,103 posts
Joes bedroom assistant.
- Gender:Male
- Location:Retford/Bovington
Posted 25 June 2013 - 08:00 PM
Hmmm engine mounts do sound like a possibility
#3
techieboy
-
-
- 22,914 posts
Supercharger of Doom
- Gender:Male
- Location:Bedford
Posted 25 June 2013 - 08:01 PM
Hmmm engine mounts do sound like a possibility
But not at 300bpm. 
#4
fezzasus
-
-
- 7,689 posts
Whipping Boy
- Gender:Male
- Location:Oxford
Posted 25 June 2013 - 08:02 PM
I've heard Arb bushings and drop links making that noise before.
#5
P11 COV
-
-
- 7,686 posts
Whipping Boy
- Gender:Male
- Location:MK
- Interests:Cars, Music, God, Family. Holidays.
Posted 25 June 2013 - 08:15 PM
That'd be at the front though?I've heard Arb bushings and drop links making that noise before.
#6
Mike (Cliffie)
-
-
- 13,354 posts
Back in a VX
- Gender:Male
- Location:North Yorkshire
- Interests:Weaving weasels woolly hats.
Posted 25 June 2013 - 08:26 PM
Take it back to Matt if it has been since the refresh.
#7
Zoobeef
-
-
- 11,103 posts
Joes bedroom assistant.
- Gender:Male
- Location:Retford/Bovington
Posted 25 June 2013 - 08:30 PM
I take it you can't get any movement on the wheel station when jacked up?
#8
P11 COV
-
-
- 7,686 posts
Whipping Boy
- Gender:Male
- Location:MK
- Interests:Cars, Music, God, Family. Holidays.
Posted 25 June 2013 - 08:38 PM
No, I had Matt Bentley who did my suspension work look at it. He had it on the ramp and checked it over. There was nothing obvious but there were witness marks on the wheel arch so that's what we thought it was. Having removed the wheel arch it clearly isn't.I take it you can't get any movement on the wheel station when jacked up?
#9
Zoobeef
-
-
- 11,103 posts
Joes bedroom assistant.
- Gender:Male
- Location:Retford/Bovington
Posted 25 June 2013 - 08:41 PM
Any marks on the wishbone and the chassis?
#10
P11 COV
-
-
- 7,686 posts
Whipping Boy
- Gender:Male
- Location:MK
- Interests:Cars, Music, God, Family. Holidays.
Posted 25 June 2013 - 09:00 PM
As I said Matt did give it the once over when I took it back the other week for a post refreshncheck over. He thought it was the wheel arch. It's a bit of a trek to go over too often but I may have too. Also it's hard to replicate over there... No roundabouts.Take it back to Matt if it has been since the refresh.
#11
P11 COV
-
-
- 7,686 posts
Whipping Boy
- Gender:Male
- Location:MK
- Interests:Cars, Music, God, Family. Holidays.
Posted 25 June 2013 - 09:01 PM
Not that I've noticed. May give it a clean up and then have a good lookAny marks on the wishbone and the chassis?
#13
fezzasus
-
-
- 7,689 posts
Whipping Boy
- Gender:Male
- Location:Oxford
Posted 26 June 2013 - 06:06 AM
Missed that. I've got a slightly warped rear disc that makes a rapid squeaking while cornering, it's conceivable if it were warped more it would make a knocking noise instead.That'd be at the front though?I've heard Arb bushings and drop links making that noise before.
#14
JamesC
-
-
- 991 posts
Need to get Out More
- Gender:Male
- Location:Shropshire
- Interests:Cars, Beer, Diving, not necessarily in that order....
Posted 26 June 2013 - 08:00 AM
Could be a slight contact between wishbone and chassis under heavy compression.
#15
TazN
-
-
- 2,931 posts
Scary Internerd
- Gender:Male
- Location:Suffolk
- Interests:Video Games, Airsoft, American Football, Cars
Posted 26 June 2013 - 10:02 AM
Abit stumped if it's when going right only and rear left... especially a 300bpm knock
Have you looked at the driveshaft and related bits?
#16
christhegasman
-
-
- 5,316 posts
Scary Internerd
- Gender:Male
- Location:Leicester
-
Interests:cars
motorsport especially BTCC
rugby
eating out
keeping fit
Posted 26 June 2013 - 03:49 PM
What shocks you got on it ?
I had a rapid rattle from a recently refurbed gaz nickel
Swapped it for my old billies no noise
But all credit to gaz the sorted it f o c in a couple of days just cost me postage to them
All ok now with the gaz stuff back on
have you checked the wheel bearings
Edited by christhegasman, 26 June 2013 - 03:52 PM.
#17
P11 COV
-
-
- 7,686 posts
Whipping Boy
- Gender:Male
- Location:MK
- Interests:Cars, Music, God, Family. Holidays.
Posted 26 June 2013 - 04:23 PM
Well thanks guys... Lots of ideas here
Cv joint
Bearing,
Shock
Fouling wishbone or chassis
Just difficult to work out what as you have to be around 40 mph, under acceleraton and turning hard right.
Anyone willing to lie on the back of the car with thier headin the wheel arch whilst i drive it hard around an MK roundabout!!?
It does suggest its doing something only when under compression.
I might have to give in and send it back to Matt.
#18
TheRealVXed
-
-
- 5,975 posts
Sidekick
- Gender:Male
- Location:Gotham City
- Interests:Holy potatoes, fist combat, lycra
Posted 26 June 2013 - 04:25 PM
cv joint?
That would have been my first port of call. Left hand bends change the angle to where it bonks...
#19
P11 COV
-
-
- 7,686 posts
Whipping Boy
- Gender:Male
- Location:MK
- Interests:Cars, Music, God, Family. Holidays.
Posted 12 July 2013 - 07:42 PM
Matt Bentley changed the CV joint today. Seemed to be a little play there and all other avenues have been explored and discounted.
Its still there!!!
Getting me worried now. Matt, Scuffers were wondering about the diff. Having had 2 gearbox changes in 3 years I am not pleased by that thought.
#20
Kieran McC
-
-
- 3,416 posts
Scary Internerd
- Gender:Male
- Location:Norwich
- Interests:Fast cars,Track Days.
Posted 13 July 2013 - 07:21 AM
Matt Bentley changed the CV joint today. Seemed to be a little play there and all other avenues have been explored and discounted.
Its still there!!!
Getting me worried now. Matt, Scuffers were wondering about the diff. Having had 2 gearbox changes in 3 years I am not pleased by that thought.
Done better than that two in 12 months, this one has been one expensive mother
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
