I haven done much lately to the lp conversion. I can say that the box runs better on propane. It has more power and the engine runs cleaner. I ran cermalube through the engine . Now I'm going to change the oil over to cermalube. More about the system , it is a KME pcm, A nortic reducer,and westport omvl propane injectors. whats cool is you can plug it into your pc and program all kinds of stuff,and you can also run diagnostic on the lp system and on the box as well. I keep getting trouble codes as i have been for 5 years now. i have the evap small leak detected code and its probably the charcoal canister . I checked the vaccum valve solenoid under the hood and it works. What sucks is that yes i can clear the code with my tablet on the fly , but it sucks showing off my handy work and people ask me why is my check engine light on
thats something i need to fix. oh cermalube oil goes 20,000 miles. I got a good deal on a 5 gallon bucket of it.
---------- Post added 09-08-2018 at 03:00 PM ----------
Propane burns cleaner than gasoline, and Compressed Natural Gas (CNG) burns even cleaner. Clean enough to qualify for a HOV lane sticker and access in California. Both fuels provide less miles per tankful than the equivalent gasoline due to less energy produced. But offset by the cheap price of fuel, they are a cost savings. Usually $.35 to $.50 cheaper per gallon equivalent. Also, the federal government gave a $.50 per gallon tax credit to encourage using alternate fuels, but that probably has expired. Takes a few years to recoup the investment.
CNG is definitely safer than gasoline: evaporates quickly; does not pool on the ground if leaked; has to meet a specific range of combustion before it will ignite; and is non-toxic. Maxes out with about 4,200 PSI in the tank on a hot day, versus about 300 PSI for Propane. Around five below zero a block heater is appreciated.
96 percent of the natural gas used in the USA is produced here from Methane. Also is renewable as it is produced by landfill dumps. Both fuels have a limited number of available stations; but those are increasing.
The xB converted to propane fuel is impressive. Looking forward to the details.
25 miles to the gallon is what im getting on lpg. spark plugs are 1 heat range hotter. there is a fuel gauge in the car for the lp. bypassed it cause forklift tank senders are expensive. to bypass it i used a pressure switch and a 90 ohm resistor. It tricks the computer to think it has a gauge, when the pressure drops cause the tank is empty the switch closes and it switches back over to gas. you can hardly tell when it switches. you can though the engine changes its tone a bit. the vapor pressure is about 17 psi if i got the conversion right. The valves are stock, and since i drive like a grandma they will probably be fine. Right now its set to switch back to gas when the rpm is at 3,000 So once i hit 80 mph on the highway it goes back to gas. I found with forklifts that have valve guides go bad are mostly ones that are hammered on, high rev and no governor. running the cermalube through my gas tank should have coated my valves with ceramic, i hope. but i also have lpg valve lube. Its a slow drip into the intake manifold. thats what they use in europe for lpg and cng.
The tank is probably not legal to be mounted in my trunk, its only a 33lb dot tank, but there isnt much in ct to have a asme tank mounted under the car. Filling stations are far away for auto gas cars, and this whole conversion was less than 500 dollars. its like 1,500 for a autogas tank.
---------- Post added 09-08-2018 at 03:04 PM ----------
Have to say that your knowledge of LP systems helps !! My neighbor years ago had an old checker car that ran on both LP and gas !! To my knowledge he never had issues with the engine !!!
They can have issues burning out valves
---------- Post added 09-08-2018 at 03:08 PM ----------
I do not know about Propane, only about CNG. Due to the reduced lubricity of natural gas the intake and exhaust valves can wear out much faster than when using gasoline. Engines which normally could go a service life of 160,000 miles without grinding or replacing valves, were wearing out at 75,000 to 100,000 miles and at eight years old. The valves and the seats were wearing out quickly; the rest of the engine was fine. Obviously, the amount of engine run time is an important wear factor as is idling time.
Any conversion should include the hardened valves, like comes on an OEM version for CNG vehicles.
Just like in the early 1970's when lead was removed from gasoline and lots of engines wore out the valves prematurely. Finally, the OEM's put in hardened valves. Those valves still were not strong enough for the CNG versions.
Hoping to get details about the Propane conversion xB. From the original post, it appears to be bi-fuel, which has a whole other set of challenges, particularity the engine electronic parameters so different from gasoline.
I will keep you posted on how my valves are in a year or so. I guess were going to find out how hard the valves and seats are in a 1nzfe engine If i mess up the valves, then a whole new topic to rebuild a head will get generated
---------- Post added 09-08-2018 at 03:09 PM ----------
Hella gas mileage and burns cleaner
Sent from my LG-LS997 using Tapatalk
burns clean gas miles is only 25 mpg
---------- Post added 09-08-2018 at 03:15 PM ----------
Sounds like an interesting concept. We know our engines can last 300k plus on gasoline. How long on LP or CNG?
Im at 194,500 or so . Ive been thinking about buying a spare engine. 300k really? I bought my box at like 120k only simple problems so far. starter, battery,and brakes so far. it wouldnt hurt to have an extra engine , just cause i might scatter this one running on lp LOL