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Gentlemen,

 

I have recently been tweaking the mixture in my carbs and, whilst I have a Colourtune, I usually give the car a good fast run and then inspect numbers 1 and 4 plugs.

 

Just recently I also looked at numbers 2 and 3 and was surprised to see they are running fractionally richer than numbers 1 and 4 - has anyone else noticed this?

 

Geoff

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Yes, part and parcel of their charm. Conjoined inlet manifold on front and rear cylinders slight variations can be excepted and accepted.

 

Mick Richards

Edited by Motorsport Mickey
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Geoff,

 

Are you doing an "ignition chop" when testing ? as said good fast run and then whilst not stopping cut the ignition (you need to have a space in front you can coast into !) and then check the plugs, it will give as an accurate a plug colour as can be got. At least 2 and 3 running slightly rich shouldn't break anything or give any problems.

Conversely adjusting 2 and 3 to a leaner mix will obviously cause 1 and 4 to go weaker, it's all a matter of degree.

 

Mick Richards

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Mick,

 

Thanks for the thoughts, reckon I'll stay where I am for the moment. As for the "ignition chop" - my test run is usually on part of the M25 at an appropriate time - so maybe I'll have to move the test track!

 

Cheers

 

Geoff

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