CROSS FLOW

[BATMAN1600]

Hi Can anyone help i have just rebuilt a 1600 xflow and it is pinking can auyone help???????????????????????????? please

[andyquantum]

Spark or fuel?

[BATMAN1600]

fuel i think its been converted to unleaded

[andyquantum]

Sorry, what I meant was where are you getting the pink from? Have you set the timing correctly on the dizzy? Or are you finding it's running lean and knocking

[BATMAN1600]

the timing is now @ about top dead center which has helped abit, im oing to change it to electric ignition which might help. but when driving it pinks @ about 3800rpm

[Sam_68]

You need to be setting the advance accurately, not at 'about top dead centre'.

If you know what you're doing, continue to retard the ignition until you are confident that it has just stopped pinking under heavy load (eg. pulling up a steep hill in high gear). If you at all unsure, get it set up by an expert on a rolling road (particularly worthwhile if you are running carbs and a hot camshaft).

[andyquantum]

I'll go with the simple option.

Turn the dizzy round a bit.

Thats quite high revs for pinking, I'd also check the fuelling for flat spots

Edited by andyquantum on Monday 16th June 20:04

[Sam_68]

andyquantum said:

I'll go with the simple option.

Turn the dizzy round a bit.

Making sure to turn it in the right direction, of course.

...and if you're doing it with the engine running, make sure you don't come into contact with the plug leads, 'cos they can give you a nasty belt if the insulation isn't in perfect order and the spark decides it's easier to earth though you than jump the gap at the spark plug!

[andyquantum]

You only do that once!

[Joe T]

If you have just rebuilt it, could it be cam timing? has it got a vernier pulley?
Distributor? springs or balance weights problem, ie fallen apart so at a certain RPM it just advances the timing loads. If you have another distributor just swap it out.

[Mojocvh]

Hmmm, I rebuilt the top end of a cvh once and missed the blatently obvious figure stamped on all four piston crowns.........the engine did not pink when first run but after the first blat would then pink as per the normal scenarios, I had used a standard headgasket and the fire ring was squeezed enough in to become a hotspot once the engine was "exercised".
Fitting a headgaskit from an RST via burtons solved the problem..............