Anyone has LPG conversion with a Weber DCOE carbs? I am about to fit
two DCOE's (actually DHLA 40H -same thing) to my BMW.

I was wondering if it can be done, and what are experiences. Perhaps a
link, some photos?


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Nedavno Yvan pi¹e:

Anyone has LPG conversion with a Weber DCOE carbs? I am about to fit
two DCOE's (actually DHLA 40H -same thing) to my BMW.

I was wondering if it can be done, and what are experiences. Perhaps a
link, some photos?


No replies. Let me rephrase my question.

I heard that near me is a shop that makes custom lpg mixers. What would be
better - to put mixer between carb and inlet manifold, or between carb and
air filter (and why)?



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Nedavno AJH pise:

| Between carb and air filter snip

Thank you.



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Nedavno AJH pise:

What would be better - to put mixer between carb and inlet manifold, or
between carb and air filter (and why)?

Between carb and air filter because the throttle causes the depression
in the manifold to vary greatly. The Air velocity between the carb and
the filter should vary with demand and the mixer will draw gas in
proportion to the air velocity over it (in fact in proportion to the
square of the velocity but the drag in the gas line is similar so they
cancel out) keeping the gas mixture in step.


Another question.

My carbs are setup (main, idle and air correct jet, injection pump tube size
and venturi) for 2 litre engine, and I have 1.6 litre.

As I understand fuel jet sizes have no affect when running on LPG (am I
right?). What about air correct jet? And is (petrol) venturi size important
when running on LPG?

I will probably have to custom make LPG mixer plate. If recommended petrol
venturi size for carb (Solex PHH) and my engine (BMW M10 1.6) is 30mm
should mixer plate have inner diameter 30mm or not (currently venturi is
34mm for two litre engine)



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Nedavno Yvan@office pise:

| Another question.
|
| My carbs are setup (main, idle and air correct jet, injection pump
| tube size and venturi) for 2 litre engine, and I have 1.6 litre.
|
| As I understand fuel jet sizes have no affect when running on LPG (am
| I right?). What about air correct jet? And is (petrol) venturi size
| important when running on LPG?
|
| I will probably have to custom make LPG mixer plate. If recommended
| petrol venturi size for carb (Solex PHH) and my engine (BMW M10 1.6)
| is 30mm should mixer plate have inner diameter 30mm or not (currently
| venturi is 34mm for two litre engine)


Everyone watching football :-) No suggestion's for a mixer plate inner
diameter?




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On or around Tue, 13 Jun 2006 21:07:08 +0200, Yvan
enlightened us thusly:

Nedavno Yvan@office pise:

| Another question.
|
| My carbs are setup (main, idle and air correct jet, injection pump
| tube size and venturi) for 2 litre engine, and I have 1.6 litre.
|
| As I understand fuel jet sizes have no affect when running on LPG (am
| I right?). What about air correct jet? And is (petrol) venturi size
| important when running on LPG?
|
| I will probably have to custom make LPG mixer plate. If recommended
| petrol venturi size for carb (Solex PHH) and my engine (BMW M10 1.6)
| is 30mm should mixer plate have inner diameter 30mm or not (currently
| venturi is 34mm for two litre engine)


Everyone watching football :-) No suggestion's for a mixer plate inner
diameter?

there was a formula for that, once... now lemme see. range is between 7 and
10 times the BHP, for a mixer area in mm squared.

e.g. 100 bhp engine, mixer between 700 and 1000 mm², which I can't translate
to a radius for you 'cos my decent calculator is missing somewhere :-(
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and harmony in the cosmos. Create a blue light in your life by
telephoning the police
from the Little Book of Complete B***ocks by Alistair Beaton.

Nedavno Austin Shackles pise:

| there was a formula for that, once... now lemme see. range is
| between 7 and 10 times the BHP, for a mixer area in mm squared.
|
| e.g. 100 bhp engine, mixer between 700 and 1000 mm²

It does not depend on venturi (choke) size of a carb? Meaning I can
have 34mm venturi and 30 mm mixer? Would it have any affect when
running on petrol?

And my other question was if carb is not properly jetted for my engine
(for petrol) if i fit proper mixer plates, will it run good lpg (I am
talking about simple but efficient Solex PHH sidedrafts)?



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On or around Wed, 14 Jun 2006 06:24:05 +0200, Yvan
enlightened us thusly:

Nedavno Austin Shackles pise:

| there was a formula for that, once... now lemme see. range is
| between 7 and 10 times the BHP, for a mixer area in mm squared.
|
| e.g. 100 bhp engine, mixer between 700 and 1000 mm²

It does not depend on venturi (choke) size of a carb? Meaning I can
have 34mm venturi and 30 mm mixer? Would it have any affect when
running on petrol?

The mixer is a venturi in it's own right. If the petrol carb is much
smaller, it might not work so well.

I think that formula is right: lessee, that gives a range of about 30-35mm
diameter, which is probably somewhere close.


And my other question was if carb is not properly jetted for my engine
(for petrol) if i fit proper mixer plates, will it run good lpg (I am
talking about simple but efficient Solex PHH sidedrafts)?

If the petrol carb is really off, then you might get better results on LPG.
Mostly, engines seem to run smoother but not quite so much power.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Too Busy: Your mind is like a motorway. Sometimes it can be jammed by
too much traffic. Avoid the jams by never using your mind on a
Bank Holiday weekend.
from the Little Book of Complete B***ocks by Alistair Beaton.

Austin Shackles wrote:

e.g. 100 bhp engine, mixer between 700 and 1000 mm², which I can't translate
to a radius for you 'cos my decent calculator is missing somewhere :-(

30mm to 35mm

Steve

On or around Wed, 14 Jun 2006 12:54:33 +0100, Steve
enlightened us thusly:

Austin Shackles wrote:

e.g. 100 bhp engine, mixer between 700 and 1000 mm², which I can't translate
to a radius for you 'cos my decent calculator is missing somewhere :-(

30mm to 35mm

Steve

yeah, I found a different calculator and luckily I can remember the value of
pi.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"The breezy call of incense-breathing Morn, The swallow twittering
from the strawbuilt shed, The cock's shrill clarion, or the echoing
horn, No more shall rouse them from their lowly bed."
Thomas Gray, Elegy Written in a Country Churchyard.