LPG conversion. - Fiberglass RV


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Old 03-01-2012, 09:47 PM   #1
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Name: George
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LPG conversion.

With gas prices hitting our anxiety this could be a good topic. Many countries in EU use alternative fuel such as CNG or LPG with the latter one being more popular. You can actually get a new car such as an Opel, Skoda, Fiat, or Ford, with built in option to instantly switch from gas to LPG and back to gas. Factory option is in a few hundred dollars cost penalty. The cost of adding LPG gas injection option in gas car costs about $800-1250 and for LPG liquid injection about $1500. Gas LPG injection reduces performance about 5-10% as compared to gasoline and liquid LPG injection has undetectable loss. With the current LPG price at about $3-3.5/gal this option could become attractive in US. Alternative Fuel Fill Stations and Prices

I was fueling my car recently and asked attendant if he knew anyone who runs on LPG, he knew a couple of local folks fueling on his station. I have no clue about legality of conversion in US, but am certain that HC and NOx emission would be lower.

George.


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Old 03-01-2012, 09:55 PM   #2
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LPG Nozzle

This is LPG filling nozzle used in EU. When tank is full it automatically stops the flow and nozzle can be removed. There is no LPG venting in the process.
POPPUMP in French Guiana , a world-leading fuel dispenser, Parts of Fuel Dispenser provider

George.
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Old 03-01-2012, 09:56 PM   #3
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One of the very best fuel conversion options assumes that you start with a diesel - and add spark ignition. Then you run it on Compressed Natural Gas (CNG). CNG has huge amount of power avail, but the CNG loves very high compression ratios- like in a diesel!

One of the best/easiest to do it on that (genuinely awful) 5.7L diesel that GM foisted off on unsuspecting consumers, which was made from a 350 Olds engine. Turns out that as a spark-ignited CNG engine it is actually quite an efficient and powerful beast!

Many of the taxis in Vancouver (BC) are propane (LP) powered. Ford offered a Dual fuel version of many models around here

There are also a lot of CNG cars around here, but they suffer badly in terms of performance and range, due to the lower compression which makes the CNG quite inefficient as a fuel in "normal" engines.
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Old 03-01-2012, 10:14 PM   #4
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Adding LPG to diesel engine to burn with diesel fuel improves fuel efficiency as well without adding spark plugs.
LPG Diesel Conversions

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Old 03-02-2012, 07:08 AM   #5
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problem with lpg, or cng , is when you get to the town of bodunk utah.....and need a fillup,,,,, ????????????
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Old 03-02-2012, 07:43 AM   #6
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Back in the 70's I worked for a company that did CNG conversions mainly for fleet use.
We had about a dozen Datsun King Cab Pickups that had it done in our own fleet and everyone working there got to drive them home on the weekends.

They had both the stock gas tank and a CNG tank in the bed. Back then you had to be careful filling the tank in low temp and even driving in low temps as the CNG would go back and forth between being Gas and Liquid a lot.

We did get about double the range though with both tanks and they ran fine and were easier on the engine too.

On a side note my computer says "Datsun" is not a word that it knows!
Change is bad.

Ed
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Old 03-02-2012, 10:08 AM   #7
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Years ago, when I was a cabdriver, I drove a propane Checker taxi without any problems. The vehicle had enough range so that I could work a full 10 hour shift and drive up to 200 miles. The propane cabs had slightly less power than the gasoline Checkers but it wasn't a big issue.

Then for many years until I retired, when I was working for the airport, I drove a CNG factory-conversion GMC 3/4 ton pickup. That vehicle had only about a 100 mile range but plenty of power. Most of the everyday vehicles (not construction or snow equipment) at the airport had been converted although some were both dual CNG and gasoline.

There's a lot of vehicles in my area that have converted to CNG--UPS vans, buses, etc. but so far it seems like it works best for fleet vehicles that stay with a certain area. I would be afraid to take a "gas" vehicle cross-county but CNG is probably already having an effect on oil imports.
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Old 03-02-2012, 02:15 PM   #8
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Name: Dave
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Umm...

CNG is COMPRESSED Nat Gas - not liguified. Propane is LIQUIFIED petroleum Gas (LPG)

One of the reasons why CNG has less range in a road vehicle - no matter how you compress it - you can't fit as much in the tank as you can with a liquid

There is also LNG - Liquified Nat gas - which must be kept at -162 (or -260*F) to keep it in its liquid state


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Quote:
Originally Posted by Ed Harris View Post
Back in the 70's I worked for a company that did CNG conversions mainly for fleet use.
We had about a dozen Datsun King Cab Pickups that had it done in our own fleet and everyone working there got to drive them home on the weekends.

They had both the stock gas tank and a CNG tank in the bed. Back then you had to be careful filling the tank in low temp and even driving in low temps as the CNG would go back and forth between being Gas and Liquid a lot.

We did get about double the range though with both tanks and they ran fine and were easier on the engine too.

On a side note my computer says "Datsun" is not a word that it knows!
Change is bad.

Ed
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Old 03-02-2012, 04:10 PM   #9
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Name: George
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Searching the web I found interesting power/torque data from Orbital.
WHAT IS LIQUID LPG? - Orbital
Interesting videos:


Some of you could remember 2 cycle Orbital engine which supposed to fit into US Ford Escort but ended up as a big fiasco. I assume this is still the same company.
George.
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