Errol the run-on you described is likely due to the engine still sucking
fuel into the combustion chamber when there is enough compression and
heat or possibly a hotspot/hot plugs to combust the fuel creating a
rough idle with ignition off. What carby did it run?
I know of an L20B with almost flattops that has this same problem with
SU's, that runs too much CR. My 910 Manual shows the late model SU's had
a solenoid to the fuel bowl breather that closes and stops fuel being
sucked in when ignition is off. I think the late stock L18 carby also
has such a device.
Craig.
Errol Smith wrote:
>
> Arty,
> For a streeter I would keep the comp to 9:1 on stocky pistons or you may
> have problems with detonation unless you run Premium fuels.
> I had a look at Daniel Haywards 200B running flat tops (cylinder pressures
> 210 Psi on comp test!!!!) and the engine ran quite happily with the
> ignition turned off!
> Cheers
> Feral Errol
> WWW.Datrats.com.au
>
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