[ROVERNET - UK] RE: 2000TC Ignition Timing

slatskars at comcast.net slatskars at comcast.net
Tue Apr 15 19:02:54 BST 2008

You may be right, but in my limited experience (since 1958) I have had great success with a piece of hose when a Unisyn is not available. This was the tried and true method, before any of the later innovations. I never did like those kits with the wires sticking out of the top of the carb. I highly recommend the Unisyn, as you are measuring air flow not a physical height element, when I hold my tech sessions for our Club T-MG group, but also demonstrate the hose method. Surprisingly accurate!

 -------------- Original message ----------------------
From: "Netspace" <vmitps at netspace.net.au>
> On the TC I just look at the dashpots (without the air filter...).
> You can compare them quite easily, I think it is more accurate than 
> listening.
> ----- Original Message ----- 
> From: <slatskars at comcast.net>
> To: <rovernet at lyris.ccdata.com>
> Sent: Tuesday, April 15, 2008 3:52 PM
> Subject: Re: [ROVERNET - UK] RE: 2000TC Ignition Timing
> > Adrian,
> >
> > The old way of carb mixture and balancing (before Unisyn's) was to raise 
> > the carb piston slightly using the pin or a small screwdriver. what you 
> > wanted was a slight increase in RPM followed by a drop in RPM. If it 
> > immediately dropped, the mixture was too lean. If it increased and kept 
> > increasing as the piston is raised, too rich. After setting the mixtures, 
> > put one end of a small diameter hose in your ear with the other ablut 1/2' 
> > into the throat of one carb and listen to the air flow. Compare it to the 
> > other and adjust them until the air flow sounds equal. Reconnect the 
> > linkage and you are good to go. It really works and did for many years. If 
> > you read the manual it will tell you to tune the mixture for the best 
> > speed (In American English, that is the highest RPM). that is a good place 
> > to start, but you ddo want that slight increase followed by the drop off.
> >
> > 
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