Lotus Elan

weber

PostPost by: jens maudal » Wed Sep 13, 2006 8:20 pm

Hi everyone!
I have just got back home with my internet
bought Lotus +2 and its not all that bad, at
least it made the journy back through england
Canterbury to Newcastle and another 200 miles
from the docks to where i live.

The webers are giving me some problem thou,
they have an acceleration problem, the car tends
to stumble when i push the accelerator. The webers
are fitted with an accelerator pump that will give
a richer mixture when accelerating. Thia is what
they explaind in the manual, but they never mention
how to adjust it.
Do you recon this could be the problem that the
engine is starved when i accelerate.

Cheers
jens


Jens Maudal ***@***.***
Haandbryggeriet www.haandbryggeriet.no
tlf: 31414140 fax: 31414138 mob:90540409

-------------------------------------------------------------------------
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PostPost by: lotuselan2 » Wed Sep 13, 2006 9:05 pm

Jens

Several possibilities:

* If car was not run for some time, the orifice that the pump jet
pushes through could be clogged. Take the air box or filter off and look in
each barrel with a mirror when you give the throttle a push. You should get
a nice squirt of gas in each throat. If one or more do not pump, I believe
there is an inspection port to clean.
* There is a piston that pumps the gas, it may be faulty. This is
less likely but test is the same.
* General state of tune may be sloppy and you only see it when you
depress throttle. Check points if it is not electronic, timing and carb
balance.

Those were the easier ones.

* There could be debris in the float chamber, again if not run for a
while
* The main or the idle jets could also be clogged as well but then it
would run poorly at idle or at speed
* Next you start thinking that the jetting may be incorrect. Check
jet sizes versus spec.
* Float level high or low can give same symptom. If it is low it will
die and come back immediately. High level would take a little bit to
recover after throttle is closed a bit. You would have issues on hard
cornering also if float level was off.

Tuning Webers is actually a lot of fun! I recommend getting one of the good
books on tuning Webers (soft cover).



Ken

'69 Lotus Elan +2 with BDR

_____

From: ***@***.***lto:***@***.*** Behalf
Of jens maudal
Sent: Wednesday, September 13, 2006 4:13 PM
To: ***@***.***
Subject: [LotusElan.net] weber




Hi everyone!
I have just got back home with my internet
bought Lotus +2 and its not all that bad, at
least it made the journy back through england
Canterbury to Newcastle and another 200 miles
from the docks to where i live.

The webers are giving me some problem thou,
they have an acceleration problem, the car tends
to stumble when i push the accelerator. The webers
are fitted with an accelerator pump that will give
a richer mixture when accelerating. Thia is what
they explaind in the manual, but they never mention
how to adjust it.
Do you recon this could be the problem that the
engine is starved when i accelerate.

Cheers
jens

Jens Maudal ***@***.*** <mailto:jens%40haandbryggeriet.no> t.no
Haandbryggeriet www.haandbryggeriet.no
tlf: 31414140 fax: 31414138 mob:90540409

----------------------------------------------------------
Start.no tilbyr n? raskere bredb?nd til lavere pris.
Sjekk http://www.start. <http://www.start.no/bredband/> no/bredband/ for mer
informasjon
'69 Lotus Elan +2 with Cosworth BDR
'84 Ferrari 400i
'94 Subaru SVX
'04 Audi allroad
lotuselan2
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Location: Shamong, NJ

PostPost by: s2lola » Wed Sep 13, 2006 9:24 pm

Or another idea.....

Look at the accelerator pump carefully. The little pin that holds the
piston onto the assembly can work loose, score the bore of the accelerator
pump cavity, which then binds up and bends the u-shaped assembly really
nicely. Rendering your accelerator system useless, and also rendering the
weber "choke" (pump three times on the gas) inoperative.

Ask me how I know!!!!!!

Cheers,
Bill

-----Original Message-----
From: ***@***.***lto:***@***.*** Behalf
Of Lotus
Sent: 2006/09/13 17:01
To: ***@***.***
Subject: RE: [LotusElan.net] Weber


Jens

Several possibilities:

* If car was not run for some time, the orifice that the pump jet
pushes through could be clogged. Take the air box or filter off and look in
each barrel with a mirror when you give the throttle a push. You should get
a nice squirt of gas in each throat. If one or more do not pump, I believe
there is an inspection port to clean.
* There is a piston that pumps the gas, it may be faulty. This is
less likely but test is the same.
* General state of tune may be sloppy and you only see it when you
depress throttle. Check points if it is not electronic, timing and carb
balance.

Those were the easier ones.

* There could be debris in the float chamber, again if not run for a
while
* The main or the idle jets could also be clogged as well but then it
would run poorly at idle or at speed
* Next you start thinking that the jetting may be incorrect. Check
jet sizes versus spec.
* Float level high or low can give same symptom. If it is low it will
die and come back immediately. High level would take a little bit to
recover after throttle is closed a bit. You would have issues on hard
cornering also if float level was off.

Tuning Webers is actually a lot of fun! I recommend getting one of the good
books on tuning Webers (soft cover).



Ken

'69 Lotus Elan +2 with BDR

_____

From: ***@***.***lto:***@***.*** Behalf
Of jens maudal
Sent: Wednesday, September 13, 2006 4:13 PM
To: ***@***.***
Subject: [LotusElan.net] weber




Hi everyone!
I have just got back home with my internet
bought Lotus +2 and its not all that bad, at
least it made the journy back through england
Canterbury to Newcastle and another 200 miles
from the docks to where i live.

The webers are giving me some problem thou,
they have an acceleration problem, the car tends
to stumble when i push the accelerator. The webers
are fitted with an accelerator pump that will give
a richer mixture when accelerating. Thia is what
they explaind in the manual, but they never mention
how to adjust it.
Do you recon this could be the problem that the
engine is starved when i accelerate.

Cheers
jens

Jens Maudal ***@***.*** <mailto:jens%40haandbryggeriet.no> t.no
Haandbryggeriet www.haandbryggeriet.no
tlf: 31414140 fax: 31414138 mob:90540409

----------------------------------------------------------
Start.no tilbyr n? raskere bredb?nd til lavere pris.
Sjekk http://www.start. <http://www.start.no/bredband/> no/bredband/ for mer
informasjon
s2lola
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Posts: 260
Joined: 16 Jan 2004
Location: Toronto, Ontario

PostPost by: elansprint71 » Wed Sep 13, 2006 9:49 pm

Jens,
Congratulations! Start with the easy stuff first: make sure that the
ignition timing is absolutely to specification before touching the fuel
system.
Do not look for problems where none may exist. ;-)

Cheers,
Pete.


absjens maudal wrote:

Hi everyone!
I have just got back home with my internet
bought Lotus +2 and its not all that bad, at
least it made the journy back through england
Canterbury to Newcastle and another 200 miles
from the docks to where i live.

The webers are giving me some problem thou,
they have an acceleration problem, the car tends
to stumble when i push the accelerator. The webers
are fitted with an accelerator pump that will give
a richer mixture when accelerating. Thia is what
they explaind in the manual, but they never mention
how to adjust it.
Do you recon this could be the problem that the
engine is starved when i accelerate.

Cheers
jens

Jens Maudal ***@***.*** <mailto:jens%40haandbryggeriet.no>
Haandbryggeriet www.haandbryggeriet.no
tlf: 31414140 fax: 31414138 mob:90540409

----------------------------------------------------------
Start.no tilbyr n? raskere bredb?nd til lavere pris.
Sjekk http://www.start.no/bredband/ <http://www.start.no/bredband/>
for mer informasjon


elansprint71
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PostPost by: davidallen » Thu Sep 14, 2006 12:16 pm

Yes, I agree with Pete. This fault could have any number of causes, not just
the carbs.

Oh, and a word of warning; setting up Webers/Delorto's is a black art and
despite what the mechanic down the pub say's, it does take a lot of
experience and ideally a rolling road to do correctly.

David


_____

From: ***@***.***lto:***@***.*** Behalf
Of Pete Taylor
Sent: 13 September 2006 22:43
To: ***@***.***
Subject: Re: [LotusElan.net] weber



Jens,
Congratulations! Start with the easy stuff first: make sure that the
ignition timing is absolutely to specification before touching the fuel
system.
Do not look for problems where none may exist. ;-)

Cheers,
Pete.

absjens maudal wrote:

Hi everyone!
I have just got back home with my internet
bought Lotus +2 and its not all that bad, at
least it made the journy back through england
Canterbury to Newcastle and another 200 miles
from the docks to where i live.

The webers are giving me some problem thou,
they have an acceleration problem, the car tends
to stumble when i push the accelerator. The webers
are fitted with an accelerator pump that will give
a richer mixture when accelerating. Thia is what
they explaind in the manual, but they never mention
how to adjust it.
Do you recon this could be the problem that the
engine is starved when i accelerate.

Cheers
jens

Jens Maudal ***@***.*** <mailto:jens%40haandbryggeriet.no> -t.no
<mailto:jens%-40haandbryggerie-t.no>

Haandbryggeriet www.haandbryggeriet-.no
tlf: 31414140 fax: 31414138 mob:90540409

----------------------------------------------------------------
Start.no tilbyr n? raskere bredb?nd til lavere pris.
Sjekk http://www.start. <http://www.start.no/bredband/> -no/bredband/
<http://www.start. <http://www.start.no/bredband/> -no/bredband/>

for mer informasjon









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PostPost by: denicholls2 » Thu Sep 14, 2006 3:15 pm

Pete wrote:

Congratulations! Start with the easy stuff first: make sure that the
ignition timing is absolutely to specification before touching the fuel
system.
Do not look for problems where none may exist. ;-)

Very good advice. Webers are very adjustable, but don't tend to need
much fiddling. Starting to work on minor engine issues by fiddling with
your carbs may well send you backwards.

AFTER you have ruled out ignition-related issues, you can start to play
with the carbs.

Given a long period of disuse, I would recommend you start on the carbs
by:

1. Getting a Weber manual. I have the Haynes one and it is suited to
the purpose. Readily available. Also covers the Brit carbs.
2. Removing the various jet covers, extracting the jets, and soaking
them a few days on carb cleaner to remove any varnish deposits (at this
point, I would not do same to carbs, maybe later.)
3. Dry, check by blowing through, and reassemble. Now you're not
tuning your carb around crap in its jets. You also haven't
significantly disturbed the previous tuner's work.

My two cents,

- Doug Nicholls, 54/1822 Ma~
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