Wrong timing or Big end bearing gone?!

[mini86]

Hi, I just noticed some strange noise come out from the engine(CG10 1.0 16v).

The engine is fine for low revs, you cannot hear any knocking.
When the revs goes up, there are some knocking come from the engine sounds like the big end bearing.

There are two assumptions so far:

1.Big end bearing gone? I have tried using 5th gear at low speed and clamb a hill, there is NO knocking noise and the engine only done 60K, So I start to suspect somewhere else went wrong.

2.Timing? If the timing is wrong, Shouldn't it knocking at low revs not at high?? And the micra haven't got a distributor so you cannot adjust the timing by yourself?


Does anyone have any idea? I really couldn't define what the problem is...
Or maybe I just don't want to admit it is the big end bearing...

 

[RIK]

mine made a knokin sound we it blew up,,sumone told me it was the cranks,but i didnt really care at the time cos i was thinking of a 1.6 conversion soon as i saw blue smoke from the zorst

 

[mini86]

Mine one doesn't burn oil, no overheating, start staight away when cold & hot.
Basiclly, It doesn't have any sign shown the bearing gone apart from that noise.

Thanks for reply

 

[Herr_spl1ff]

If ti's your big end you'd see a drop in oil pressure at odd times eg backing off from full throttle on the motorway to take a slip road or intermittent pressure drops while the engine was under load, eg engine braking.

Knocking sounds by themselves are really difficult to pin down as it could be anything that moves in the engine so more info about your engine would be helpful...

 

[Monkey]

how about CV joint?? but it could be big ends.