[Roadsters] 1970 1600

[Gary and Cindy Ault]

Girault,

I don't think ignition (electrical) will make much difference in the amount 
of air/fuel drawn into each cylinder on each stroke.  I think the carbs are 
out of balance.  The idle mixtures are probably off, as well.  And, ignition 
problems could be contributing to the rough idle.  You want the air flow to 
match with the engine idling at about 700 rpm.  You'll need an airflow meter 
of some sort -- like a UniSyn to do that.  Skilled mechanics can balance 
carbs by listening to the hissing noise, but I am not one of those.

You need to have the ignition right before you can properly adjust the 
carbs:  good plugs, proper plug gap, correct dwell and timing.  You can 
probably rough them in without the ignition being correct, but I always make 
sure the ignition is right before I start on the carbs.

Gary

----- Original Message ----- 
From: "Girault Jones" <Girault at bellsouth.net>
To: <datsun-roadsters at autox.team.net>
Sent: Monday, September 05, 2011 1:08 PM
Subject: [Roadsters] 1970 1600


> While running very roughly with the air filter off, the rear carb doesn't
> intake much, if any, air.  Do I have electrical problems or carb problem?
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