BN4 Engine query/problem

[higgins]

I've had my BN4 Longbridge engine overhauled and converted to unleaded fuel.
Since the overhauling, I've driven approximately 200 miles.

A rattling noise has started to appear everytime I drive uphill, between 2.000 to 2.500 rpm. If I release the gaspedal sligthly, the noise disappears only to reappear a couple of seconds after accelerating.

1) Is this pinking?
It's always difficult to describe the rattling noise;
it sounds a like a baby's rattle filled with
screws /ubbthreads/images/graemlins/crazy.gif or something like that.

2) I'm filling the car with 98 octane unleaded. Could this level be too high?

Or do the valves just require adjusting?


Like always, while awaitng your replies, I'll have a /ubbthreads/images/graemlins/thirsty.gif or two.

regards----Higgins

 

[michalotti_tr]

This does sound like the classic 'pinking', or pinging as it is usually called in the US. If you're running with 98 octane, then it's not an octane issue but a timing issue - you will need to back off the advance until you no longer hear the rattle under those conditions.

 

[higgins]

Thanks so much for your answer.

As a matter of interest, what is actually rattling (the valves?) /ubbthreads/images/graemlins/confused.gif

And why?

Cheers---Higgins

 

[tahoe healey]

Check the points gap then use an adjustable timing light at idle then with throttle. See that it advances properly. There are springs that hold the weights in the dizzy that set control the advance weights at speed. They may not be connected or may be the wrong spring.