Sloan85
|
| posted on 4/9/13 at 08:17 PM |
|
|
Vibration when driving
So I drove back from the IVA today which included 20 miles on the M1. I kept it between 60 and 70 when on the motorway but there was a lot of
vibration through the floor/chassis. The vbration was making the vision in the mirrors blurry it was that bad.
This was the first proper drive for me so I wasn't sure if this normal for these cars? What could be done to reduce vibration?
Cheers
http://mkindygsxr.blogspot.co.uk
|
|
|
|
|
madteg
|
| posted on 4/9/13 at 08:24 PM |
|
|
Could be wheels out of balance but would guess its the prop if self made.
|
|
|
ReMan
|
| posted on 4/9/13 at 08:34 PM |
|
|
Never mind the vibration and noise, did it pass?
www.plusnine.co.uk
|
|
|
Ben_Copeland
|
| posted on 4/9/13 at 08:42 PM |
|
|
Either back wheels or propshaft would be first check
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
|
|
|
Sloan85
|
| posted on 4/9/13 at 08:53 PM |
|
|
Wheels I assume to be balanced when they arrived from Wheelbasealloys (all wheels have the weights on, none have fallen off). Prop is sierra modified
by MK. What should I be looking for on the prop?
The vibration isn't noticeable when going through the rev range, probably because I was busy thinking "this is awesome!" as I was
ragging it up to 11k rpm :-) It did get a bit frustrating on the motorway though.
quote:
Originally posted by ReMan
Never mind the vibration and noise, did it pass?
Yup, passed no probs. Only had to tweak the power commander slightly, add a label to my reverse switch and file a sharp edge on the exhaust mounting
bracket. DVLA to deal with next.
[Edited on 4/9/13 by Sloan85]
http://mkindygsxr.blogspot.co.uk
|
|
|
madteg
|
| posted on 4/9/13 at 09:00 PM |
|
|
Nip it down to kwikfit for a free balance check, if not out there will be no charge. At least then you know its not them.
|
|
|
Ben_Copeland
|
| posted on 4/9/13 at 09:01 PM |
|
|
quote:
Originally posted by Sloan85
Wheels I assume to be balanced when they arrived from Wheelbasealloys (all wheels have the weights on, none have fallen off). Prop is sierra modified
by MK. What should I be looking for on the prop?
The vibration isn't noticeable when going through the rev range, probably because I was busy thinking "this is awesome!" as I was
ragging it up to 11k rpm :-) It did get a bit frustrating on the motorway though.
quote:
Originally posted by ReMan
Never mind the vibration and noise, did it pass?
Yup, passed no probs. Only had to tweak the power commander slightly, add a label to my reverse switch and file a sharp edge on the exhaust mounting
bracket. DVLA to deal with next.
[Edited on 4/9/13 by Sloan85]
Cheapest check is to do wheels first, never assume that someone hasn't made a mistake.
Then check prop balance weight hasn't come off. I hope mk didn't just shorten prop and send back!!!
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
|
|
|
ReMan
|
| posted on 4/9/13 at 09:08 PM |
|
|
quote:
Originally posted by Sloan85
Wheels I assume to be balanced when they arrived from Wheelbasealloys (all wheels have the weights on, none have fallen off). Prop is sierra modified
by MK. What should I be looking for on the prop?
The vibration isn't noticeable when going through the rev range, probably because I was busy thinking "this is awesome!" as I was
ragging it up to 11k rpm :-) It did get a bit frustrating on the motorway though.
quote:
Originally posted by ReMan
Never mind the vibration and noise, did it pass?
Yup, passed no probs. Only had to tweak the power commander slightly, add a label to my reverse switch and file a sharp edge on the exhaust mounting
bracket. DVLA to deal with next.
[Edited on 4/9/13 by Sloan85]
Great news, well done 
Do you mean its not there under load?
I doubt is wheels, unless your feeling it through the steering wheel badly.
is it a harsh tinny vibration/noise, or a duller throbbing when sitting at a constant speed? Solid mounted engines will put a bit of vibration through
the car, and dont forget BECs are not for motorway use 
Can you feel the vibration on the tunnel, like its the prop?
Any more clues?
www.plusnine.co.uk
|
|
|
Ben_Copeland
|
| posted on 4/9/13 at 09:11 PM |
|
|
You don't get vibration in the steering wheel if its the back wheels
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
|
|
|
Slimy38
|
| posted on 4/9/13 at 10:46 PM |
|
|
My first thought was 'that is how my bike feels at particular speeds', right down to the blurred wing mirrors. It has a 'reverse
sweet spot' where it's really uncomfortable to ride. Ten miles up or down and it smooths out again. It also happens in other gears at the
same rev range.
Since you have a BEC, it might be worth seeing if it is rev related, drop it down a cog and drive at the same revs.
[Edited on 4/9/13 by Slimy38]
|
|
|
Mr Whippy
|
| posted on 4/9/13 at 11:25 PM |
|
|
60 mph is the normal speed for imbalanced wheels to show up, is worse in lightweight cars. Kwikfit are hopeless at getting it right btw as their
machines are not calibrated well I ended up going to a specialist fitter who did it right first time.
|
|
|
40inches
|
| posted on 5/9/13 at 07:59 AM |
|
|
Mine is pretty bad around 70, 5mph either side and it is Ok. A winter upgrade is a TRT and prop balance.
There is also high frequency vibration around 4000rpm, another winter mod is to rubber mount the engine cradle.
All this pails into insignificance taking into account that the gearbox is mullered 4500 miles on the bike and 1000 in the MK, but not unusual even
on a bike, apparently they are made from cheese
So an "E" or Z1000 box as another winter mod, or possibly a Mazda V6 transplant.
|
|
|
britishtrident
|
| posted on 5/9/13 at 08:12 AM |
|
|
With wheel balancing the knowledge of the the guy working the machine is the critical thing.
Front wheels need a full dynamic balance but you can quite often get away with tatic balance.
For rear wheels a simple static balance will usually be good enough, you can use a spirit level balancer for this or weld up a simple hand spun
static balancer up using an old stub axle & wheel hub of the correct pcd. The one I made for balancing Imp wheels used the bottom an old front
strut from a Chrysler Avenger and an Imp front hub.
Essentially this is just a bracket to hold the stub axle horizontal, to reduce friction the wheel bearing should have the seals removed and the
grease washed out using WD40. The important thing is to reduce the bearing friction as much as possible so adjust the end float allow a little more
clearance than normal.
Mount the wheel and spin the wheel at a reasonable speed and wait until it naturally comes to complete rest. Mark the lowest point of the tyre with
chalk. Repeat the process if the wheel stops in approximately the same place you have found the heaviest point on the tyre.
[Edited on 5/9/13 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
Slimy38
|
| posted on 5/9/13 at 08:47 AM |
|
|
I might have mentioned this on another post, but I have also noticed that some wheel balancing places only put weights on one edge (or even the inside
flat surface of the wheel), whereas others have machines that say what weights have to go on what edge. I don't know whether there is a
significant difference?
|
|
|
Sloan85
|
| posted on 5/9/13 at 11:44 AM |
|
|
It felt like a very high frequency vibration. Would have a guess it is prop or engine related, not wheels.
http://mkindygsxr.blogspot.co.uk
|
|
|
whitestu
|
| posted on 5/9/13 at 12:05 PM |
|
|
quote:
Then check prop balance weight hasn't come off. I hope mk didn't just shorten prop and send back!!!
I think that is all they ever do isn't it?
I've never heard of them balancing a prop.
Stu
|
|
|
DavidW
|
| posted on 5/9/13 at 12:10 PM |
|
|
quote:
Originally posted by whitestu
quote:
Then check prop balance weight hasn't come off. I hope mk didn't just shorten prop and send back!!!
I think that is all they ever do isn't it?
I've never heard of them balancing a prop.
Stu
I think I have this problem with my MK shortened prop. I've changed wheels and problem remained.
Can I get the prop balanced or do I need to buy a new one from somewhere?
David
|
|
|
Bluemoon
|
| posted on 5/9/13 at 01:05 PM |
|
|
^^ You can get the existing one re-balanced but it maybe not much more to get a new one made by a prop-shaft supplier (MK re-use the UJ at one end of
the prop, it maybe best to start with a new one)...
Something I may look at eventually..
|
|
|
DavidW
|
| posted on 5/9/13 at 02:05 PM |
|
|
Interesting, who are the favoured suppliers?
I only really notice i in 5th at speed, does the collective think this really is the prop?
Thanks and sorry for the thread hijack.
David
|
|
|
Bluemoon
|
| posted on 5/9/13 at 02:14 PM |
|
|
quote:
Originally posted by DavidW
Interesting, who are the favoured suppliers?
I only really notice i in 5th at speed, does the collective think this really is the prop?
Thanks and sorry for the thread hijack.
David
Should happen in all gears at the same speed (as the prop rotation rate is fixed with relation to road speed)... If it goes away at the same speed in
4th it's not the prop..
Dan
|
|
|
Mr Whippy
|
| posted on 5/9/13 at 04:33 PM |
|
|
Test the prop by simply taking off a rear wheel and running it in gear, any vibration must then be the prop...
|
|
|
Smoking Frog
|
| posted on 5/9/13 at 09:24 PM |
|
|
Diff bolts tight?
|
|
|
Rogthebandit
|
| posted on 29/9/13 at 06:45 AM |
|
|
Hi
Mine was vibrating also when crusing on and off the throttle. It was the prop phase that was wrong. I realigned it and its a different car. No vibs at
any speeds and revs right thru to over 100 mph with no issues. Going to put a cush drive in the prop over chrimbo.
|
|
|
jacko
|
| posted on 29/9/13 at 03:54 PM |
|
|
quote:
Originally posted by Rogthebandit
Hi
Mine was vibrating also when crusing on and off the throttle. It was the prop phase that was wrong. I realigned it and its a different car. No vibs at
any speeds and revs right thru to over 100 mph with no issues. Going to put a cush drive in the prop over chrimbo.
Hi when you say realigned it how did you do that ? just twisted the joint at one end ?
Thanks jacko
|
|
|
Rogthebandit
|
| posted on 30/9/13 at 03:53 AM |
|
|
Hi jacko
Ya i turned the spline through 90 deg on the front section of the prop. Massive different. I am going to put a cush drive in also then rebalance.
|
|
|
