In need of quite a lot of help

[will.i.am.s2]

Evening all, currently in a spot of bother with my williams and on the verge of pulling my hair out. Basicaly its developed a nasty rattle bang on 3000rpm all the way up the revs. Sounds like cam rattlle to me but realy dont know. Is 3000rpm the point were the 2nd cam kicks in? I changed the oil from fully synthetic to the correct grade for the winter and since then its all gone tits up

I was thinking of getting some super thin fully synth to see if that gets rid of the rattle but ive got doubts it will work. Could possibly geta a new head or cams or....It would have been covered a million times before but in laymans terms what is involved in dropping a megane f7r engine in a williams as they seem readily available?

[16v_paddy]

These aren't v-tecs so no 2nd cam to kick in

How nasty is it? Try & post a video & we'll probably be able to give you a better answer.
As for the megane engine, all you need to do is fit a williams head & flywheel to it & job's a good un because the megane block is virtually identical to the williams 1

[Coops]

as above, a video would really help diagnosis. if you can film the noisiet part in your opinion, as in does it sound like its coming from top or bottom end?

[Wobba]

Need to hear it really.

[will.i.am.s2]

okay lads cheers il see if i can get a decent recording of it but its not that loud so might not pick it up. It appears to be coming from the head and its quite a deep rattle....il post up a clip in a bit.

Definately only present at 3000rpm upwards when accelarating there seems to be a sweet spot on the throttle were it goes realy quite or stops.Theres no loss of power yet so im a bit confused on this

[will.i.am.s2]

okay lads cheers il see if i can get a decent recording of it but its not that loud so might not pick it up. It appears to be coming from the head and its quite a deep rattle....il post up a clip in a bit.

Definately only present at 3000rpm upwards when accelarating there seems to be a sweet spot on the throttle were it goes realy quite or stops.Theres no loss of power yet so im a bit confused on this

[16v_paddy]

I'm gonna have a stab in the dark & say it's noisy tappets

[will.i.am.s2]

yeah could well be paddy...i did do a recording but after uploading it to my pc i realised you couldnt here it, i taped a digi camera to my rear view mirror and drove, could only here exhaust :D I will do one and post up in the week as i can get it to do it when its stationary.

I changed the oil back to 5w/40 fully synthetic and put an original oil filter on today and its going alot better with perfect oil presure again so i guess its nothing catastophic as it goes like stink still. we had a good look over it anyway and recon it could be some kind of pulley / bearing or knackered tappet. I was thinking cams or bottom end but It only does it under load, if you back of the revs over 3k there is no noise and you can hold the throttle in a way and accelarate and it virtualy stops.

Im just going to take it easy on it for now anyway get it moted again then send it of to my local race car preparers for a nose and tinker

[Wobba]

Drive it till it blows up and don't worry about it tbh.

[Coops]

my 172 does something similar at 2500rpm, vibration and knock from top end

so I just keep the revs over 2500