> my 1500 is pinking under medium load (away from junctions and up hills etc.
> The timing is spot on 10 BTDC, the carbs are balanced and set for 4 percent
> emissions and the advance unit is working (when I suck the pipe).
>
> What can I do to stop my pinking? what have I missed?.
>
> Cheers,
>
> Chris.
>
> --
> -- 1977 Spitfire 1500...Everyday/Only Driver.
Hi Chris,
Assuming that you don't use unleaded petrol (in which case 10 BTDC
will be too far advanced), you've probably got a build up of carbon
on the spark plugs, cylinder head or both. Try cleaning up the plugs
first. If that doesn't work you may need a decoke. Other possible
causes are: 1. use of the wrong plugs and 2. Timing gear
replaced/overhauled and not refitted accurately, therefore timing
marks on pulley are meaningless. My Spit. is in the latter condition
so I set up the timing so that it just doesn't pink in 4th gear at
low speed up a steep hill. Seems to work fine.
Hope this helps,
Jonathan
Spitfire 1500
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