Auto-LPG Conversion Thread

[tanoshi]

regarding venturi design:

curious lang ako.
in the design why is it necessary to have mixer/vaporizer and not inject the LPG in liquid form direct to the carb's mouth, then regulate the flow proportional with the engine's demand for fuel or as per RPM.

is the current design already at optimum for non-SGi compatible engines?

[ezem]

regarding venturi design:

curious lang ako.
in the design why is it necessary to have mixer/vaporizer and not inject the LPG in liquid form direct to the carb's mouth, then regulate the flow proportional with the engine's demand for fuel or as per RPM.

is the current design already at optimum for non-SGi compatible engines?

LPG-liguified petroleum gas...
LPG is liquified and its actual form is not liquid but rather vapor. To be able to liquify the LPG, you need a high pressure or simply to compress it, i think about 75psi. therefore injecting it in liquid form would require the carb's mouth to be pressurized but since the carb's air intake has atmospheric pressure since it's open to the atmosphere as to suck air, the LPG in the carb's mouth will vaporize and will not be in liquid form. it needed a vaporizer for the LPG to vaporize at a fast rate since in the venturi, the LPG is being sucked through vaccuum pressure due to the air flow from the air intake. Also the vaporizer is needed for the LPG to enter the venturi in pure vapor form. not having a vaporizer would have the LPG enter in liquid and/ or vapor or both due to (not that fast) evaporation, thus resulting to unstable a/f ratio. In that form, where the LPG is either liquid or vapor or having both state in mixed form, the ECM will have a hard time computing for the right a/f ratio. And for the thought of putting the flow regulator after the varb and before the manifold would require another hardware that will result to a more expensive kit. Also, I think it would be costly that way as the flow regulator would be easily damage having it near the injector...

just correct me if i'm wrong about it...

[tanoshi]

regarding SGi:

is my understanding correct that LPG is injected in liquid form directly in the intake manifold, as close as possible to the combustion chamber?

Regarding carb types:
is my understanding correct on this one too, that regular liquid petrol is sucked in the vacuum pressure where it mixes with air, that the intake manifold contains petrol-air mixture.

Isn't it that LPG is more volatile than regular petrol, thus could readily mix with air as with regular petrol.

enlighten me please

[ezem]

regarding SGi:

is my understanding correct that LPG is injected in liquid form directly in the intake manifold, as close as possible to the combustion chamber?

Regarding carb types:
is my understanding correct on this one too, that regular liquid petrol is sucked in the vacuum pressure where it mixes with air, that the intake manifold contains petrol-air mixture.

Isn't it that LPG is more volatile than regular petrol, thus could readily mix with air as with regular petrol.

enlighten me please

ang alam ko, the SGI system has vaporizer too. And also the propane in the LPG is cold, that's why heat is applied through the regulator to vaporize it...kaya i think even in SGI, vapor form padin ang pumapasok sa intake manifold and not liquid...

regarding about carb:

in the tank the petrol is in liquid form, but due to the low pressure in the venturi, the gas after being sucked in the venturi is in vapor form (not gaseous but vapor). the petrol will be sucked there in the part where it the area becomes smaller. then after that small area, the "flow" flows much faster that it flows on point A it is hard to explain since the point where the end tube of point A ends (inside the tube) will not be in the same level as the where the end of tube B ends (refer to the pic) thus having pressure difference...di ko maituro ng di interactive e hehehe ituturo ko sa'yo sa blackboard na lang, para interactive...fluid mechanics with thermodynamics yan e...dapat ako nagpapaturo sau nan kasi petroleum chemist ka hehehe you know the characteristics of those fuels more than i do hehehe

please see the pic



through the venturi, the air is being mixed with the petrol vapor

iif you mix the LPG in the air (* atm pressure or any pressure below 50psi), it would evaporate and dissipates, not unless in a controlled environment ofcourse such that there is a certain container that you could mix them and still can retain it as a mixture...the lower the pressure, the faster the LPG would evaporate.
volatile, do you mean unstable/ dangerous for that matter?

in the internal combustion engine (ICE), the combustion chamber just needs a small amount of gas...so small that it should be on vapor form and not pure liquid form. it's hard to think that that certain small amount would be in liquid form pa...so small it (ICE) just needs a vapor of the petrol...

[ezem]

sir GH, paki include naman po ito sa contact number ng Eroom

David Do
Eroom Phils. Inc.
Unit E, G/Flr Highway54 Plaza, 986 Stanford St. cor.
EDSA, Mandaluyong City
tel. nos.: 7062231 Fax: 7062232 Cel.: 09196834112
emai: realizeroom*eroomkorea.com

[tanoshi]

Pagpasensyahan na ninyo ako ha,

was considering an engine transplant from carb to efi
(double purpose to upgrade to better engine too, from 1Litre-3cylinder carb to 1.3Litre-4cylinder Toyota 4EFTE turbo).
now a hypothetical question, if i have an efi engine but my intake manifold is made of steel, is it still possible to have SGi kit installed?

salamat po in advance.

[ezem]

Pagpasensyahan na ninyo ako ha

ok lang bro...anything i can do to help!

was considering an engine transplant from carb to efi (double purpose to upgrade to better engine too, from 1Litre-3cylinder carb to 1.3Litre-4cylinder Toyota 4EFTE turbo)

wow! galing toyota GT starlet turbo yan 4EFTE mo dude ah...the most powerful among the E series * 135hp...e di palit ka din transmission into C150 or C151?..mag 4AGE ka na lang sir hehehe para astig...sorry mejo OT

now a hypothetical question, if i have an efi engine but my intake manifold is made of steel, is it still possible to have SGi kit installed?

salamat po in advance.

yes sir, pwedeng pwede, magdri drill lang sila ng butas dun sa intake manifold...

[wesrex315]

hi chief, how do u measure your fuel consumption using lpg? di ba initially it starts with petrol then lpg. sabi din nila, indi accurate ung automatic full tank from lpg refilling stations.

[1997]

hi chief, how do u measure your fuel consumption using lpg? di ba initially it starts with petrol then lpg. sabi din nila, indi accurate ung automatic full tank from lpg refilling stations.

+- lang cguro...

[Mile2]

hi chief, how do u measure your fuel consumption using lpg? di ba initially it starts with petrol then lpg. sabi din nila, indi accurate ung automatic full tank from lpg refilling stations.

It's accurate as long as you fill up on the same station, filling stations differs on the filling pressure.

example: I can fill up more liters of LPG at CleanFuel E. Rodriguez rather than Total - Shaw.

So to make my computation straight and consistent I do filled my tank right now at CleanFuel E. Rodriguez every time. hehehe may free payong pa for 200 points

[ezem]

alam ko may effect din yung kung anung oras ka nagpalagay ng LPG e...kasi change in temperature, means change also in pressure, means a slight change in state of LPG or any fuel for this matter, means a slight change in content...hehehe

__________________
passion for fashion? craving for savings?
visit MAI PASSION boutique at the fashion village * Tiendesitas

[tanoshi]

ok lang bro...anything i can do to help!



wow! galing toyota GT starlet turbo yan 4EFTE mo dude ah...the most powerful among the E series * 135hp...e di palit ka din transmission into C150 or C151?..mag 4AGE ka na lang sir hehehe para astig...sorry mejo OT



yes sir, pwedeng pwede, magdri drill lang sila ng butas dun sa intake manifold...

Thanks for the reply ezem, just want to be really sure, before I reach the point of no return, would the installers here kindly confirm feasibility of such.

thanks in advance...

[dieselNUBI]

just had crv re tuned sa greenfuel after i replaced my air filter. mdyo matakaw pa FC ko now. will compute for new FC after my next full tank with new filter.

[ezem]

Thanks for the reply ezem, just want to be really sure, before I reach the point of no return, would the installers here kindly confirm feasibility of such.

thanks in advance...

to date, among the installers, only bigmike of greenfuel is currently active in this thread. i suggest that you try to call the installers na lang..here's the link to their contact details...just click it na lang

LPG installers

__________________
passion for fashion? craving for savings?
visit MAI PASSION boutique at the fashion village * Tiendesitas

[filchaser]

Hello Tsikoteers. Green Autogas is an accredited LPG installer. They showed me the LPG Conversion certificate with license number issued by the DTI. Aside from recommendations from fellow tsikoteers, this is one reason why I chose Green Autogas.

[filchaser]

Just to help you with added information, Green Autogas is owned and operated by Greengas, Inc. (one of the 10 DTI-accredited installers) They also have their own refilling station under the name Velco in Mindanao Ave.

Although I've seldom refill my LPG at Velco, my mileage is better than refilling at the nearby Petron Araneta. My mileage in Manila Autogas in C5 is also good. Any explanations?

[Djerms]

Hmmmmm, maybe I'll try to fill up at Manila Auto Gas next time. I'm getting low mileage with Petron Xtend. Saan ba yang manila autogas?

[paolorenzo]

Hmmmmm, maybe I'll try to fill up at Manila Auto Gas next time. I'm getting low mileage with Petron Xtend. Saan ba yang manila autogas?

Manila Auto Gas along C5 is beside the Hyundai dealership, near the flyover going to Kalayaan/Southbound. From Libis going southbound, it's on the right side. As you pass Valle Verde, stay on the right lane. You will pass Caltex, and Manila Auto Gas is right beside it (before you reach Hyundai).

[Djerms]

Thanks Pao,

I remember this. I think its a white station.

Nice avatar! hahaha.

[ghosthunter]

regarding SGi:

is my understanding correct that LPG is injected in liquid form directly in the intake manifold, as close as possible to the combustion chamber?

nope, LPG is turned into vapor form and that is injected into the intake manifold.

Regarding carb types:
is my understanding correct on this one too, that regular liquid petrol is sucked in the vacuum pressure where it mixes with air, that the intake manifold contains petrol-air mixture.

In an ordinary gasoline carb engine, yes.

Isn't it that LPG is more volatile than regular petrol, thus could readily mix with air as with regular petrol.

LPG is normally a vapor when exposed to atmospheric pressure and ambient temperature. Compared to gasoline, gasoline will require some time to evaporate but it will be a liquid in normal pressures and temperatures. That main difference makes LPG easier to mix with air. But do note that LPG is slightly heavier than air so if there is zero wind, LPG will tend to settle in low laying pockets.

alam ko may effect din yung kung anung oras ka nagpalagay ng LPG e...kasi change in temperature, means change also in pressure, means a slight change in state of LPG or any fuel for this matter, means a slight change in content...hehehe

true... LPG does expand a bit when it's hotter. So it is really advisable to fill up when it's cooler.

Pagpasensyahan na ninyo ako ha,

was considering an engine transplant from carb to efi
(double purpose to upgrade to better engine too, from 1Litre-3cylinder carb to 1.3Litre-4cylinder Toyota 4EFTE turbo).
now a hypothetical question, if i have an efi engine but my intake manifold is made of steel, is it still possible to have SGi kit installed?

salamat po in advance.

yes... it's possible to install a SGI kit ... although if it lacks an O2 sensor, you will still need to have it fitted with one.