I had a similar problem on my L20b, which has a 30/70 cam and SUs. I found
out that it was caused because I had my idle set too high (950-1050 rpm),
the idle was so high because at 700 rpm the cam made the engine run as if it
was about to jump out of my engine bay. The reason, (i think) that the motor
keeps going when the engine idles so high is because there is more vacum
under higher idling speeds that sucks more fuel in etc etc (I hope) but I
set my idle lower for a bit and it turned off every time.
pete.
>From: Craig Overend <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: L20b advice needed
>Date: Mon, 13 Nov 2000 18:50:52 +1100
>
>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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