Hi Ashley,
i had the same problem as soon as i went above 5000 rpm the tacho started
jumping,
i have bosch electronic ignition, not the blue bird type,
the tacho had no problems after that
all the way to 8000rpm
thanks
Heath
----- Original Message -----
From: "Derek Franklin" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, 23 May 2000 11:30
Subject: Re: Tacho going nuts
> Ashley,
>
> >I'm having a problem with my dato going above 150kph.
> Try 180+, they call off the chase above 160 or so :)
>
> >1st gear to 7000, 2nd to 7000, 3rd to 7000, 4th to 6000 and >stops
pulling
> and if you look at the tacho at this point its >bouncing from 5000-7000.
If
> you keep your foot flat it slowly >drops away.
> >
> >I originally thought it was the dizzy(points), So I replaced it >with the
electronic
> out of the Bluebird Series II, this did >help as before it would stop
pulling
> at about 5000.
> >
> >Any clues???
>
> Maybe just the limitations of the ignition system. Usually an L-series
dizzy
> will become a bit 'jiggly' at those sort of rpm, i.e. the advance becomes
unstable
> ( generally tends toward less advance, which is fortunate ). To get really
screaming
> rpm in an L4 you might need to go to crank-fire ignition, as even the S2
Bluebird
> ignition relies on the dizzy/oil pump shaft to spin it.
> Sounds like your plugs just aren't getting enough juice to burn the intake
charge
> properly - the energy-per-spark from your coil also suffers at really high
rpm.
> Since your tach runs from the coil, the odd tach behaviour points to an
ignition
> problem.
>
> I'd check everything from coil wiring to spark plugs looking for a weak
point.
>
>
> DF
>
>
>
>
>
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