<VV> Corsa update IV - running lean, float adjustment or jet change?

Duane, Jim (US SSA) Jim.Duane at it.BAESystems.com
Fri Jul 21 14:46:10 EDT 2006

Hi Guus.

	The factory float level (or even the float level recommended by
LTY&section=TECH&page=TECH-17 ) seems to work and IMHO is most likely
not your problem.  The most sensitive part of the Carter is it's
"enrichment" system.  Tne needle is tapered and will rise and fall in
the seat depending on vacuum and throttle position.  
	In any case, including changing the needle/seat, you have to
take the top off the bowl anyway.  It can be esaily done with the carb
on the car.  With the SafeGuard, you are in a great position to

Let us know how you make out.

Jim Duane
'66 180 Corsa CVT
Colonial Corvairs

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Guus de Haan
Sent: Friday, July 21, 2006 2:25 PM
To: Virtual Vairs
Subject: <VV> Corsa update IV - running lean, float adjustment or jet

I decided to take the Corsa to work today.

A nice test drive over 60-70 miles with both highway and secondary road.
Temperature was also a nice test. This morning about 75F while the trip
back was something like 85-87F. The car drove at a 400F maximum but
usually lower with at speeds up to 60 mph. The speedometer is very
positive, 45 was enough to keep up with traffic on a road with 50 speed
limit. It is also clear that the car runs (a
little) lean. The Air/Fuel meter on the SafeGuard reads definitely more
to the lean, especially after the engine heats up good after an hours
drive or so. I'm talking almost to the limit of the lean scale for those
that know the SafeGuard Air/Fuel indicator. This probably causes extra
heat too.

I want to change some things but maybe someone can help me with a few
questions. So the car runs lean. Changing the jet sound like the
solution. Someone suggested that the lean mixture could also be float
setting. Setting the fuel level a little higher might help. Is there a
test (or trick) to decide if the level is okay without taking the carb
apart? I can imagine a to low fuel level might effect other things like
acceleration, high speed driving or turbo boost. Any ideas?

I want to order some bigger jets to see what happens. My carb's main jet
is .089". Next one would be .094". Is this enough to get from lean to
rich or do I have to go bigger?

The boost on the car is not maximum yet but it is there and funny enough
even a little in second year. The combination of rebuild engine, turbo
and carb seems to be a good one. Only needs some fine tuning.

Have a good weekend!

Guus de Haan
The Netherlands
'65 Corsa Turbo-Charged Cvt
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