Auto-LPG Conversion Thread

[ghosthunter]

Overheating might be a sign of the engine running too lean. Have your car's auto-lpg "calibrated" with their PC.

[kikoteng]

Hi Guys !

First of all, thanks to this forum, I took the plunge and converted my ride to LPG just last week.

Ride is a corolla 2k xl. 1.3liter carbureted engine. So got an open loop LPG kit.

Got my Aldesa LPG kit installed by LHI in Binondo. They're also the ones distributing the Flashlube valve saver thing.

Been trying out my ride the past few days. Initially, I felt the LPG has weak acceleration compared to gas so I advanced the ignition timing and changed to new spark plugs. As what has been discussed in this thread (all 200+ pages, hehe), each of those improved power significantly.

Got a few questions though.

1. Has anyone here tried using a 'colder' spark plug ? What is the difference compared to your usual 'non-colder' plug ?

2. When switching from LPG to gas while driving, I was taught to rev hard (not to floor the accelerator, probably midway) as I flick the switch to gas. Sometimes the transition is smooth but sometimes the car seems like its drowning, speed slows down and dies. Then it is difficult to start the car. I suspect there is some left over LPG mixed with gas that is causing this. Question is, to the venturi kit owners here, do you experience the same problem ? How's your switchover (LPG to gas) procedure ?

Thank you in advance, LPG brothers ... hehehe

Kiko

[ghosthunter]

Ride is a corolla 2k xl. 1.3liter carbureted engine. So got an open loop LPG kit.

2. When switching from LPG to gas while driving, I was taught to rev hard (not to floor the accelerator, probably midway) as I flick the switch to gas. Sometimes the transition is smooth but sometimes the car seems like its drowning, speed slows down and dies. Then it is difficult to start the car. I suspect there is some left over LPG mixed with gas that is causing this. Question is, to the venturi kit owners here, do you experience the same problem ? How's your switchover (LPG to gas) procedure ?

Your switch over problems is caused by your carburator. Gasoline accumulates in the float area and takes a bit of time for that fuel to be used up.

If you switch over too quickly, your engine will take in both gasoline and lpg, resulting in a over-rich air-fuel ratio. This will not ignite or will burn slower. If the engine stalls, you have to crank the engine long enough to remove the remaining gasoline before you can start on LPG.

Typically what I hear with carb engine conversions to LPG, if you plan to switch from gasoline to LPG, you have to set the system to "neutral" and let the carburator run dry. At that point the engine stalls. Then set the switch to LPG mode and start the engine using LPG.

As for my car, I have a 4AFE engine with venturi-lpg kit. Switch over is simply reving up the engine a bit and quickly switching from gasoline to lpg mode. The switch cuts off the gasoline fuel injectors and starts the flow of LPG to the mixer.

Switching from LPG to gasoline is similar but there is a chance of going over-rich with the engine. It's because it takes time (a couple of seconds) to use up the remaining amount of LPG in the intake even with the LPG shut-off if the engine is reving not so fast.

[kikoteng]

Typically what I hear with carb engine conversions to LPG, if you plan to switch from gasoline to LPG, you have to set the system to "neutral" and let the carburator run dry. At that point the engine stalls. Then set the switch to LPG mode and start the engine using LPG.

Yep. That's what I do with gas to LPG switchover. After some time, the engine jerks due to absence of gas, I try to switch immediately to LPG. Sometimes, the engine stalls. Oftentimes, it doesn't.

As for my car, I have a 4AFE engine with venturi-lpg kit. Switch over is simply reving up the engine a bit and quickly switching from gasoline to lpg mode. The switch cuts off the gasoline fuel injectors and starts the flow of LPG to the mixer.

Switching from LPG to gasoline is similar but there is a chance of going over-rich with the engine. It's because it takes time (a couple of seconds) to use up the remaining amount of LPG in the intake even with the LPG shut-off if the engine is reving not so fast.

In that case, when doing LPG to gas switchover, it would make sense then to rev the engine harder (as i flick the switch to gas) to use up the remaining LPG.

Thanks.


Kiko

[n5110]

Got a few questions though.

1. Has anyone here tried using a 'colder' spark plug ? What is the difference compared to your usual 'non-colder' plug ?

2. When switching from LPG to gas while driving, I was taught to rev hard (not to floor the accelerator, probably midway) as I flick the switch to gas. Sometimes the transition is smooth but sometimes the car seems like its drowning, speed slows down and dies. Then it is difficult to start the car. I suspect there is some left over LPG mixed with gas that is causing this. Question is, to the venturi kit owners here, do you experience the same problem ? How's your switchover (LPG to gas) procedure ?


Kiko

im using a step colder plug on my ek civic with venturi kit. no noticeable performance gain but have some improvement when the car is idling. feeling ko lang yun, been using lpg since aug 2008 so far so good lalo na tumataas na naman ang presyo ng gas.

i just need to maintain at least 1.5K rpm and i can switch to lpg without any problems. siguro ito ang difference sa caburetor type kit mas maselan ng konti.

[kapitan88]

sino sino dito ang naka carb-type kit, yung walang mixer? baka pwede tayo mag compare ng notes, especially yung size ng hole ng carb restrictor at timing adjustments.

[kikoteng]

sino sino dito ang naka carb-type kit, yung walang mixer? baka pwede tayo mag compare ng notes, especially yung size ng hole ng carb restrictor at timing adjustments.

Am using carb-type kit and currently running bi-fuel.

Di ba the mixer is the round thing placed on top of the carburetor ? Is it possible to have an LPG setup without the mixer ?