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Corsa Sport » Message Board » Help Zone, Modification and ICE Advice » Buzzing at 4000rpms? » Post Reply

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Greasemonkey	posted on 18th May 04 at 13:31
	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]
Lucusade	posted on 18th May 04 at 13:15
	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 ;)
AK	posted on 18th May 04 at 12:46
	.... als, could you describe your prob in more detail... buzzing from inside, or outside.... buzzing? like a bee :lol:
AK	posted on 18th May 04 at 12:45
	i ripped the lower heatshield covering the CAT off, it vibrated
Greasemonkey	posted on 18th May 04 at 08:45
	is there a heat shield over the manifold, these are a bastard for vibrating
and-m	posted on 18th May 04 at 08:43
	Possibly the speedo cable?
Lucusade	posted on 17th May 04 at 11:37
	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 :lol: )
OFcorsa	posted on 17th May 04 at 11:34
	I get the sme with my 1.4 8v. hink its something to do with vibration and natural frequency.
Lucusade	posted on 17th May 04 at 11:28
	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? :thumbs: