Actually there are 3 nozzle sizes available: .090, .100 & .125
The latter are for the biggest of carbs, SU8s.
Roadsters use .100 nozzles.
Mike
----- Original Message -----
From: "Brian Hollands" <bholland@hayes.ds.adp.com>
To: <Fred_Katz@ci.sf.ca.us>; <jschmi7@us.ibm.com>; "Datsun Roadster Mailing
list" <datsun-roadsters@autox.team.net>
Sent: Tuesday, July 24, 2001 7:46 PM
Subject: RE: Carbs and rear end noise (the car's)
> Fred wrote
> I'm a novice in experimenting with needles, but perhaps your jets are
> mismatched to the needles
> Just a guess but this made me remember a posting from a couple of days
ago.
> * My carbs have never been quite up to par, so I was going to try and play
> > around with the setup a little. For the practice/qualifying session I
> tried
> > out some N-17 needles with the .100 jets. The car sounded absolutely
sick
> > until I got past 6000 rpm, and then it would run decent. I was three
> > seconds a lap slower, but I was able to home in a little on why the car
> > wouldn't run past 6000 rpm with the other needle/jet setup. I qualified
> > 18th out of 19 cars.
> >
> > For the race on Saturday, I put the old .090 jets back in, and decided
to
> > try some FX needles, which are richer in the top end than the M-39's I'd
> > been originally using.
>
> I never realized that there are different diameter nozzles for the
> roadsters. I assumed they were all the same and that the needle profile
was
> the only variable. If that needle is supposed to run in a smaller jet,
that
> would explain the unexpected richness. Fred may not be such a novice
after
> all.
> Brian
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