From: John McKenzie on
Yvan wrote:
>
> Nedavno Jason James piše:
>
> > How I'd do it is to start off with both adjusters set to 1/4 number of
> > max turns out or both max-flow controls opened to a 1/4 of
> > max-flow,..then take it for a drive on a freeway or a very quiet back
> > road, running the car at full-throttle in 3rd gear. If its starving
> > for gas, the engine will run out of revs. Then continue to open each
> > control a whole turn of each screw at a time until you achieve no
> > further improvement in performance. Then open both one turn more and
> > leave them. The evap should have one or two controls which adjust idle
> > quality. From memory one is idle mixture, the other "vacuum
> > sensitivity". I'm reasonabley sure these are only active at idle to
> > off-idle RPMs.
>
> I adjusted max-flow for primary barrel, and I think it's OK now.
>
> But I can not tune second barrel. I can feel when it starts to open.
> When on petrol, and I press my foot down car just accelerates. On LPG I
> can feel (and hear) that second barrel is open, but no acceleration
> until revs go above 3500.
>
> I tried to turning screw in and out (one turn at the time) but I always
> get the same result.
>
> Perhaps I should mention that LPG is introduced to each barrel with a
> spud pipe (there was no room for a mixer plate directly above the
> carburetor).

What you might need to look at is another adjustment on the convertor -
does it just have one screw for idle mixture, or does it have a second
screw or bolt that can be adjusted. If it does, that is the sensitivity,
and it sounds like it could benefit from it bringing full convertor
output on a little sooner.

I have to be honest, I'm not a fan of the spud conversion. In theory it
can work, but I've not seen it actually deliver to a level I'm satisfied
with.

precisely how tight is the space - there are some very low profile gas
rings/bonnets to suit those sort of carbs - running it that way might
*(mostly due to that setup being a little more restictive and providing
a stronger signal at higher rpm/flow rates) get enough lpg flowing to
sort things.

If at all possible - could you take a couple of pics of the convertor
and the carb (as well as looking down the throats of the carb) and
upload/link to them. It might help to know specifically what
mixer/convertor combo you have.



--
John McKenzie

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From: Yvan on
Nedavno John McKenzie piše:

> What you might need to look at is another adjustment on the convertor
> - does it just have one screw for idle mixture, or does it have a
> second screw or bolt that can be adjusted. If it does, that is the
> sensitivity, and it sounds like it could benefit from it bringing full
> convertor output on a little sooner.

No it does not have a second screw. Here is a photo:

http://catalogo.landirenzo.com:88/sap/its/mimes/images/jpg\riduttori_gpl_se81_ita.jpg

(I hope the link is OK).

There is a idle mixture screw (on the right side), some plug just below
it. On the left is connector for liquid LPG, and on the bottom is
something for cleaning - when I unscrew it some oil comes out.

Also, when this vaporizer was on my Audi it had the solenoid in the
middle of it (as on the photo), and a another hose from the opposite
side of the solenoid up to the mixer (some sort of vacuum control I was
told).

Now there is no solenoid, and no hose. Hole where hose was is left open.

So I have only idle mixture screw.


> I have to be honest, I'm not a fan of the spud conversion. In theory
> it can work, but I've not seen it actually deliver to a level I'm
> satisfied with.
>
> precisely how tight is the space - there are some very low profile gas
> rings/bonnets to suit those sort of carbs - running it that way might
> *(mostly due to that setup being a little more restictive and
> providing a stronger signal at higher rpm/flow rates) get enough lpg
> flowing to sort things.

Very tight space. Mixer plate could be fitted only on top of the
carburetor within air filter box. But choke plate is in the way, and so
I can not make it thin (and I have to fabricate one, the carburetor is
from 70's). It has to be ~20 mm thick, and there is no space left
between the mixer plate and the air box top cover.


> If at all possible - could you take a couple of pics of the convertor
> and the carb (as well as looking down the throats of the carb) and
> upload/link to them. It might help to know specifically what
> mixer/convertor combo you have.


I posted a link of a photo for my vaporizer, I will post some photos
later today (when I get back from work).


--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** Registered Linux user #291606 **
/__/\____/--\__\ ** http://counter.li.org/ **
From: Yvan on
Nedavno Jason James piše:

> This is getting into an area I'm not familiar with. I've asked Athol
> (in this group) if he can throw some light.on your problem.
>
> Jason.

Thank you. I hope he can help.

--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** Registered Linux user #291606 **
/__/\____/--\__\ ** http://counter.li.org/ **
From: Yvan on
Nedavno Yvan piše:

> I posted a link of a photo for my vaporizer, I will post some photos
> later today (when I get back from work).

.... and here it is:

http://www.ptt.yu/korisnici/i/v/ivica/lpg/lpg.html


Hope this can help.

BTW I also have another problem. Engine will not run on lpg until it
heats up around 1/4 of the normal operating temperature, and will stall
if I lift my foot of throttle. When it heats up it runs OK at idle.

Before I changed carburetor I could start my engine on lpg. Just to
mention it runs OK on petrol.




--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** Registered Linux user #291606 **
/__/\____/--\__\ ** http://counter.li.org/ **
From: Noddy on

"Yvan" <me(a)privacy.net> wrote in message
news:5qm6grF10svmaU1(a)mid.individual.net...

> BTW I also have another problem. Engine will not run on lpg until it
> heats up around 1/4 of the normal operating temperature, and will stall
> if I lift my foot of throttle. When it heats up it runs OK at idle.

Does the new carburettor have an auto choke?

If it does, you need to have it removed.

--
Regards,
Noddy.