Nasty noise

[Anonymous]

Right this is driving me nuts. At around 6 -6500 rpm I'm getting a nasty clattery noise from out of my twin 40's that I had put down to valve bounce. However the engine will carry on revving up & off the scale. The noise comes in for just a short burst and then disappears. It occurs in all gears but most noticeably when dropping down from 4th to 3rd and then accelerating hard. It doesn't do it when revving at rest. I'm sure its in the engine and not anything outside.
Anyone got any bright ideas (Ste)???:)

[Anonymous]

twice i have had this mad sound come from mine like a helicopter or summit

after i rev it a bit its goes.

god knows what all that is about

Micky@novaload.net :)

[Anonymous]

oo, can it be resinance? only thing i can think of!!

[Anonymous]

yeah

somming vibrating in engine, but at only a cetain freq... it will come in harmonics, so the first resonance will be at a certain rev, then 2x that rev will have another resonance... and so on... tighten everything up, and get someone to listen when it does it to find source

[Anonymous]

or make that thing heavier also changes its harmonic

BEng Hons Automotive Electronics Engineering :) worship my electronics skills :D

[Anonymous]

sounds like a vibration my 2.0 did this till i removed the heat shelds from the exhaust

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[Anonymous]

I`ve heard it and it definately mechanical noise, not a loose shield or nething. I thought it had a slight effect on the acceleration while it was happening, so the valve bounce thing sounded plausible.

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