Hi there, some questions: Are you regulating thepropan flow with the ball valve? Is this truck carburated or fuel injected? in the later case, this setup can damage the injectors because they are running without fuel?
I'm not regulating LPG with ball valve. The ball valve is only a choke to restrict LPG in best RPM. The main regulator is still the gas throttle valve on the carburetor. So this SUV is a carbureted vehicle. Thank you for your attention on this setup.
@revizal OK, so the amount of gas flow provided by the vapourize is fixed? I mean is there a flow control as a function of say the engine vacuum? Thanks for your time...
Yes, the rate of LPG from the vapourizer is fixed. The flow control is the carburetor's throttle. I mean, the output LPG from the vapourizer goes to carburetor inlet, so the carburetor still function just like on gasoline system. The engine vacuum make the LPG suck in to the engine via the carburetor. That because of no modification on the carb.
Since I have LPG on my car for more than 4 years, this is what I can share with you:
1.If you can change the timing easily, do it ! Advance the timing from, for example 6*BTDC to 8*BTDC, in other words, LPG burns SLOWER than petrol, so the spark needs to occurre a little bit EARLIER. If you cannot advance the spark, use HHO, since it helps flame spreading.
2.Use one degree COLDER spark for example BPR6ES instead of BPR5ES. Because LPG burns hotter than Petrol.
That's very helpful in improving my LPG car. Thank you very much. I just got about 15 km test drive on this system. The most different from gasoline system is the power and throttle response little bit lower than gasoline. But overall the system run very smooth on various RPM.
Main problem I encounter is different air temperature (density) which makes it difficult to find the right mixture.On idle,it's important to have smooth running, because it's a sign of good AFR. Idle rpm might be a bit higher, but that depends on the actual engine. 5-15% less power and 10-15% higher consumption is normal, but it's around 40-50% cheaper than gas. Good thing would be to have Vexus/Nexus installed because LPG requires higher energy levels to ignite - it has ~105 octanes
This is what I was being told - Have someone hold the engine fixed @3000 rpm, meanwhile you close the IDLE nob until the rpm drops (too LEAN mixture), then turn it the other way until it drops again (too RICH mix). Your ideal spot should be somewhere in between. But, since you have AFR gauge, you don't have that problem :D
And is there any other place for air to get into the engine other than the aircleaner tube? with that other propane hose in there it sure seems restrictive.
The device is an AFR (Air to Fuel Ratio) meter. The air flow only via the air filter box (horn of the carb). This system need a right air-fuel ratio (ideal = 1 : 15.3), and it worked not very well when the air flow easy to the engine (that mean the air volume is too high at that condition). Later, I will try to check the gas/fuel consumption on this system.
@revizal ahhhh stoich meter, I understand. The rest should be adjustments. but very cool, get a big propane tank at the house, and have your own gas station.
steering wheel is on the wrong side
novachevyguy 1 year ago
Hi there, some questions: Are you regulating thepropan flow with the ball valve? Is this truck carburated or fuel injected? in the later case, this setup can damage the injectors because they are running without fuel?
vochitoken 1 year ago
@vochitoken
I'm not regulating LPG with ball valve. The ball valve is only a choke to restrict LPG in best RPM. The main regulator is still the gas throttle valve on the carburetor. So this SUV is a carbureted vehicle. Thank you for your attention on this setup.
revizal 1 year ago
@revizal OK, so the amount of gas flow provided by the vapourize is fixed? I mean is there a flow control as a function of say the engine vacuum? Thanks for your time...
vochitoken 1 year ago
@vochitoken
Yes, the rate of LPG from the vapourizer is fixed. The flow control is the carburetor's throttle. I mean, the output LPG from the vapourizer goes to carburetor inlet, so the carburetor still function just like on gasoline system. The engine vacuum make the LPG suck in to the engine via the carburetor. That because of no modification on the carb.
revizal 1 year ago
Since I have LPG on my car for more than 4 years, this is what I can share with you:
1.If you can change the timing easily, do it ! Advance the timing from, for example 6*BTDC to 8*BTDC, in other words, LPG burns SLOWER than petrol, so the spark needs to occurre a little bit EARLIER. If you cannot advance the spark, use HHO, since it helps flame spreading.
2.Use one degree COLDER spark for example BPR6ES instead of BPR5ES. Because LPG burns hotter than Petrol.
3.Reduce spark plug gap to 0.7mm
demios99 1 year ago
@demios99
That's very helpful in improving my LPG car. Thank you very much. I just got about 15 km test drive on this system. The most different from gasoline system is the power and throttle response little bit lower than gasoline. But overall the system run very smooth on various RPM.
revizal 1 year ago
@revizal
Main problem I encounter is different air temperature (density) which makes it difficult to find the right mixture.On idle,it's important to have smooth running, because it's a sign of good AFR. Idle rpm might be a bit higher, but that depends on the actual engine. 5-15% less power and 10-15% higher consumption is normal, but it's around 40-50% cheaper than gas. Good thing would be to have Vexus/Nexus installed because LPG requires higher energy levels to ignite - it has ~105 octanes
demios99 1 year ago
This is what I was being told - Have someone hold the engine fixed @3000 rpm, meanwhile you close the IDLE nob until the rpm drops (too LEAN mixture), then turn it the other way until it drops again (too RICH mix). Your ideal spot should be somewhere in between. But, since you have AFR gauge, you don't have that problem :D
demios99 1 year ago
what is the device on the dash.
Also what is the compression ratio of the engine?
And is there any other place for air to get into the engine other than the aircleaner tube? with that other propane hose in there it sure seems restrictive.
But way cool. burnin clean now.
d3adp001 1 year ago
@d3adp001
Thank you d3adp001.
The device is an AFR (Air to Fuel Ratio) meter. The air flow only via the air filter box (horn of the carb). This system need a right air-fuel ratio (ideal = 1 : 15.3), and it worked not very well when the air flow easy to the engine (that mean the air volume is too high at that condition). Later, I will try to check the gas/fuel consumption on this system.
revizal 1 year ago
@revizal ahhhh stoich meter, I understand. The rest should be adjustments. but very cool, get a big propane tank at the house, and have your own gas station.
d3adp001 1 year ago
@d3adp001
Thank you. I hope I could get a bigger LPG tank for it and suitable LPG tank to fit on the car.
revizal 1 year ago