Thanks Adrian
It rather confirms my suspicions.
We will see what happens with new plugs
Regards
John
At 07:30 AM 8/07/2012 +0100, you wrote:
Hi John
Ok you have the answer I suspect, 94k km is about 60k miles and in my
experience cross flows because of their design tend to start having issues
at about 50-60k. Remember they are not like a modern efficient engine. If
the stems are hardened and valve guides worn with blueish smoke on start
and idle oil is being drawn into the chambers and will not all be burnt
and then the leftovers will harden and coat the valves and seats and once
hot will create the overrun and glo- plug and then the overrun. This will
be made worse by the use of unleaded even with additive I am afraid.
Ultimately the valve seats will be burnt away and loss of power or even
starting trouble will come about.
Try the sparks plugs but I suspect it will not cure it or will be
temporary. The best solution is head off, either replace or refurbish with
new seats and valves. You could take this as an opportunity to convert to
unleaded in either case and possibly go to a stage 2 head to get better
performance, don't go to far with the tuning or you will stress the bottom
end that has already done 60k and will also need to have carb. Changes.
There are loads of articles about 1600 cross flow tuning around. If you
take the head off then measure the piston bore to check if they are
starting to wear oval, if they are, which is common, then piston wear and
piston ring wear may also be contributing and you may need to consider
this, which would mean a rebore and new pistons/rings.
I know this is not a great scenario, but having learnt the hard way with
these engines in Cortinas and early Escorts in my teens and early twenties
I am pretty sure of what I say. My best friend was a Ford mechanic in
those days and we were forever swapping cylinder heads and engines trying
to get more power and tuning them. The problem you have developing is due
to the engine design I am afraid.
I hope this helps, and is not too costly to fix.
Regards,
Adrian
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