John,
I just ordered a set of pre-smog needles for the 2L carbs. After examining
all the needles I have I noticed the smog needles were the richest
especially at WOT. They are tapered much more than others I have.
Your rich burn at idle could be due to several factors however such as too
much choke or incorrect choke setting of the butterfly or pooling of gas. I
only use full choke upon startup and then immediately give less choke while
it is warming up and while driving I use only enough choke to give me a
"clean" pull when accelerating.
After measuring all the SUs I have I noticed all were incorrectly set re:
opening of the butterfly on choke. I had to bend all the choke rods to get
the correct opening.
Mike
----- Original Message -----
From: "John Schmitt" <jschmi7@us.ibm.com>
To: <datsun-roadsters@autox.team.net>
Sent: Monday, February 12, 2001 10:09 AM
Subject: SU needles
> I have a 69 2L with a presmog distributor W/O smog pump. I run it at 16
> deg BTDC and get pretty good performance. I am on an engine rebuild of
> about 3000 miles ago and have not really abused it.
>
> I say all of that because I have always gotten a black smoke at startup
and
> have a pretty acrid exhaust smell. I am told that it is probably due to
an
> over rich condition because that is the way they set everything in 69
> accounting for a smog pump recycling those emissions.
>
> I have read, in this forum, several time that folks were experimenting
with
> different needles to cure this rich running. I have never seen any
> response that the magical cure has been found. Was the US the only area
to
> have received the SUs without a smog pump? I doubt that Australia
> required it in 69 but they all got solexes. What about Canada? Someone
> surely got the SU - 2000 that did not have a smog pump and had proper
> needles.
>
> Thanks to any replies in advance.
>
> John Schmitt Telecommuter External # - 847-458-7829
> pager 800-759-8888 pin# 8710561
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