excessive engine vibration at high speed
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excessive engine vibration at high speed
Hi,
I've a CU engine that runs well at low speeds but as soon as I get to ~80kph/50mph it starts to vibrate violently which can be felt in the cab. This occurs whether the throttle is open or not and occurs every time (i.e. a consistent speed-related symptom). Compression check suggest a healthy engine. I recently refurbished and rebalanced the carbs which has not solved the problem.
Has anyone experienced similar or can advise what might be the problem?
Cheers,
Matteo
I've a CU engine that runs well at low speeds but as soon as I get to ~80kph/50mph it starts to vibrate violently which can be felt in the cab. This occurs whether the throttle is open or not and occurs every time (i.e. a consistent speed-related symptom). Compression check suggest a healthy engine. I recently refurbished and rebalanced the carbs which has not solved the problem.
Has anyone experienced similar or can advise what might be the problem?
Cheers,
Matteo
1980 2l CU Aircooled; left-hand drive - now officially a historic vehicle!
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Re: excessive engine vibration at high speed
Could be a tracking issue - have you noticed any uneven tyre wear or had new tyres recently fitted?
'86 DG, Weber Carb
- 937carrera
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Re: excessive engine vibration at high speed
Knock the van out of gear when this happens to eliminate engine concerns.
Vibration through the wheel, front wheel balance /steering play
Vibration through the seat, rear wheel balance
Vibration when braking, warped discs / drums
Could also be other things, but that should help the diagnosis
Vibration through the wheel, front wheel balance /steering play
Vibration through the seat, rear wheel balance
Vibration when braking, warped discs / drums
Could also be other things, but that should help the diagnosis
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
- Mocki
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Re: excessive engine vibration at high speed
cv joints?
Steve
tel / txt O7947-137911
________________
1989 2.1LpgWBX HiTop Leisuredrive Camper
1988 2.1 Caravelle TS TinTop Camper
tel / txt O7947-137911
________________
1989 2.1LpgWBX HiTop Leisuredrive Camper
1988 2.1 Caravelle TS TinTop Camper
Re: excessive engine vibration at high speed
Thanks for the suggestions all,
Same tyres as usual. I'll do a test run tonight and take it out of gear and will also inspect CV joints.
Same tyres as usual. I'll do a test run tonight and take it out of gear and will also inspect CV joints.
1980 2l CU Aircooled; left-hand drive - now officially a historic vehicle!
- sarran1955
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Re: excessive engine vibration at high speed
Hello,
Broken , cracked, or failed rubber front engine mount, ( 4 of them)..
or even nasty CV joint..
Cordialement,
Broken , cracked, or failed rubber front engine mount, ( 4 of them)..
or even nasty CV joint..
Cordialement,
- clift_d
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Re: excessive engine vibration at high speed
300CE wrote:...had new tyres recently fitted?
I've got the same question about new tyres, but for a different reason. If you've had new tyres fitted then I would suggest you check whether they were properly balanced at the time they were fitted - we had a similar issue with our car which kicked in at a similar speed and was down to this issue.
1988 LHD T25 1.6TD Westfalia Club Joker Hightop syncro
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Re: excessive engine vibration at high speed
Check they've been fitted properly. I nearly had a rear fall off and the other three were all loose after getting tyres swapped
Honorary "Dave"
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Re: excessive engine vibration at high speed
Sir Brixalot wrote:Check they've been fitted properly. I nearly had a rear fall off and the other three were all loose after getting tyres swapped
http://forum.club8090.co.uk/viewtopic.php?f=1&t=166078
Was that you I helped in Teesside this afternoon ?
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
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Re: excessive engine vibration at high speed
My van started vibrating at 50 and got steadily worse until 60 then it was undrivable.
CV Joint
CV Joint
AGG 2.0L 8V. (Golf GTi MkIII)
Re: excessive engine vibration at high speed
Update: On a 50mph+ test run I took the van out of gear and the vibration continued. All looked/felt right on inspection of rear suspension/driveshaft so I took it into my usual garage.
Up on the lift they saw movement (30+mm) at the tyre and it turned out to be an old tyre worn unevenly. Thanks for your suggestions and I'm embarassed I missed it after the pointers
Still sorted now and I'm looking forward to a trip out for a long weekend
Up on the lift they saw movement (30+mm) at the tyre and it turned out to be an old tyre worn unevenly. Thanks for your suggestions and I'm embarassed I missed it after the pointers
Still sorted now and I'm looking forward to a trip out for a long weekend
1980 2l CU Aircooled; left-hand drive - now officially a historic vehicle!