Lucusade
Member
Registered: 6th Jun 03
Location: Milton Keynes
User status: Offline
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Hello all,
My corsa seems to make a buzzing noise as i hit 4000rpms through the gears. It goes once ive past 4500rpms?
Its definatly coming from the engine. Im running a 1.4sri (16v)...
Any ideas? 
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OFcorsa
Member
Registered: 6th Jan 03
Location: Cheltenham, Gloucestershire
User status: Offline
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I get the sme with my 1.4 8v. hink its something to do with vibration and natural frequency.
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Lucusade
Member
Registered: 6th Jun 03
Location: Milton Keynes
User status: Offline
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quote:
Originally posted by OFcorsa
I get the sme with my 1.4 8v. hink its something to do with vibration and natural frequency.
Ive never had it before...and ive just done an engine change.
btw my cars an 8v not a 16v. must be my wishful thinking (i try not to set my standards to high  )
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and-m
Member
Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
User status: Offline
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Possibly the speedo cable?
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Greasemonkey
Member
Registered: 17th Apr 02
Location: Drives a Tractor
User status: Offline
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is there a heat shield over the manifold, these are a bastard for vibrating
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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i ripped the lower heatshield covering the CAT off, it vibrated
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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.... als, could you describe your prob in more detail...
buzzing from inside, or outside....
buzzing? like a bee
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Lucusade
Member
Registered: 6th Jun 03
Location: Milton Keynes
User status: Offline
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yeah, kinda like a bee trapped under ya bonnet.
but it only lasts a half a second once you pass 4000 rpms. Im gonna try the exhaust heatsheild and check the speedo cable, but its just weird that it only does it between 4000-4500rpms through all the gears...
dunno about reverse 
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Greasemonkey
Member
Registered: 17th Apr 02
Location: Drives a Tractor
User status: Offline
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its just resonance, the engine will cause what ever is making the noise to vibrate in harmony with the pitch of vibration the engine makes at them revs, everything has a natural resonance, dosnt matter what gear you are in like you said its the revs and the vibrations caused by them revs
All ya gotta do is change its resonance by tightening the nut etc this will change the point at which the object vibrates, BUT if its some thing that carnt be fixed better or tightened then it needs removing if possible
[Edited on 18-05-2004 by Greasemonkey]
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