Pistons hitting maybe?

 

It doesn't sound good - have you checked the oil level?

 

Oil level is ok. Changed the oil about 500 miles ago and it's gone down about 2 thirds the distance between max and min. Topped it up anyway.

It could have jumped a notch on the timing, belt is overdue but looked ok.

Also the noise seems more from the left, gearbox side of the engine and not uniform across the cylinders which made me think it wasn't timing. It's very tappy but I'm not too fussed about that, just the knocking/rattling noise.

 

Perhaps its oil pressure related?
As the variator kicks in you get a drop in pressure causing the noise to become more prominent ?

 

Sounds like a tapping noise. You can get that from the timing being out but it sounds worse on your car.

It's in time with engine revolutions but sounds to fast for it to be a dropped valve. They sound more like hitting metal on metal like a toffee hammer against a tin.

 

Did a compression test today

C1 - 170
C2 - 170
C3 - 90
C4 - 140

 

That's not good

 

Sounds like big end beating on number 3 - very common. Sorry to hear about your troubles

 

Shame I'm not even close enough to you guys to flog it for breaking!

Put a lot of work in recently to get it back on the road after it being a non-runner for a long time due to sele pump going. A pitty because other than this hasn't put a foot wrong and seemed a great little runner. Still, got a lot of jobs done on it I'd never done before so a good learning experience at least!

 

Aren't you going to fix it?

 

I would have a go of stripping the engine and overhauling it, but I don't have a garage. Wouldn't fancy stripping an engine outside, especially at this time of year!

A reconditioned engine would cost about the same the car is worth and if I bought another engine not reconditioned who is to say it wont end up having problems as well.

 

That's how my twinny sounded when the big end went. I found it easy to just chuck a new engine in but my original CF1 will be rebuiilt eventually