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1967 911 soiled plugs

trevorcarr

PCGB Member
Member
i have a 1967 911 2.0. it runs beautifully on new/clean plugs but only for about 50-100 miles. Then I get uneven tickover and poor low rev running,fine above 2000 revs.
 
How would you describe the state of the 1000 mile old plugs?
I presume the car is on carbs, which type?
graham.
 
Thanks Graham,it’s every 100 miles or so.
The carbs are twin Weber’s and it has electronic ignition fitted. The plugs are sooty black
 
That's it then, running rich at low rpm, just right above 2 to 3Krpm and further.
The primary circuit is over jetted. It is/was common practice to set carbs and Mech Inj rich at the bottom so the engine would not run weak at the top.

A good tuner will balance the jets to give a good compromise..

The prob comes with the Webers themselves, many tuners will be puzzles and few hold the unique jets needed, but will do what they can with what they have.
I am assuming the carbs are in good condition esp the butterfly spindles in the bodies which are prone to wear, but they do need to be good all-round to get the best tune.
Not sure where you are located as there are not many who can tune the webers well nowadays.
You could do far worse than to join DDK online as it is called, very focused on early 911's and lots of advice to be freely gained.
 
Thanks Graham. I live in Swansea and have struggled to find somebody who understands the Weber’s as you suggest.
will try the DDK site for recommendation.
thanks for your help,appreciated
 
Response from the DDK boys here:

Here's a few shops in the south that might be worth a call:
Caerphilly - [URL]http://www.redcastleclassics.com[/URL] - Alfa/Merc mainly but know their greasy stuff.
Cardiff - [URL]http://www.bodysoulautoworks.com[/URL] - Lots of contacts, knowledgeable.
Swansea - [URL]http://www.njrestorations.co.uk[/URL] - no personal experience of these guys but have been recommended.
Cardiff - [URL]http://www.welshspecialistcars.co.uk[/URL] - again, no personal experience but they say they're 'specialists' so...
 
Thanks guys,I’ve booked in bodysoulclassics on Monday.
After calling them,I found that they have a VW air cooled background as well as lotus and Morgan
 

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