diesel lpg conversions

Quote:

---

Originally Posted by chunk

lpg injected diesels have been around since world war 2 where they were used because of the shortage of fuel. the technolagy died off in the fifties before making a minor come back in the early eighties. lpg and nos injection is completly different nos is a sudden shot of gas into a petrol engine to make it go faster and lpg/diesel is a constantly measured supply of gas and fuel into an engine to make the fuel burn more efficently hence you get better fuel economy. and if you want to see a diesel engine go bang wash your finer filter in petrol and it will blow the head through your bonnet, i've seen it happen on a rodeo.

---

1. Nitrous Oxide in a petrol engine effectively supplies additional oxygen - to the extent that Nitrous Oxide replaces normal air in the intake, the proportion of oxygen is raised from 20% to 50% allowing additional fuel to be burnt for the same intake volume. Refined as a technique for getting addditional emergency power from fighter plane engines during WW2, when if you did not get the extra performance the engine (and plane and pilot) were going to be destroyed anyway, so a high risk of serious engine damage was acceptable.

2. In the 1960s I was living in Roma when the local power station converted to natural gas - They retained the same engines, the main equipment being two 1000hp straight eights diesels standing about twelve feet above the floor. They were run with the injectors at idling quantity and the governor controlling the amount of natural gas entering the inlet manifold, so that almost all the power came from the gas.

The rest of the powerhouse looked like a museum of power generation, with progressively bigger motors from about 100hp up, all except the above diesels being spark ignition engines designed to run on gas, actually producer gas from timber that was a byproduct of land clearing in the district from the 1930's on.
John

I have heard that because of the greater efficiency in the burn, the gasses are much hotter and without hardend valves, .. there is the possibility of components being adversly effected. The trucks get away with using dieselgas because they are designed from scratch for it.

Dosen't get hot enough to do any damage. Trucks aren't designed for dual fuel and I think you'll find most if not all truck heads have hardened valve seats. Look at this web page www.dieselgas.com.au

From what I have read regarding fitting LPG to Diesel that it can prolong engine life. It is very normal for unburnt diesel to pass into the exhaust where it continues to burn. Lpg reduces this and actually drops the exhaust gas temperature (EGR).
I also read an article in a trucking magazine that one company took too identical trucks one was on LPG the other wasnot. After 250,000k the engines were stripped and the one on LPG was in better nick. (I do realise that there are many other factors that influence longevity of engines) This was conducted by an independant trucking company not associated with the LPG conversion company.
m2c

I've just picked up today the 4X4 Australia Complete Towing Guide which has a vehicle comparison with 5 mid-size diesels including the disco... and a 4 page story on Gas injection... haven't had time to read yet but will scan and post tonight.

I had a look inside the inlet and exhaust manifolds today of a Defender that had been converted to LPG fumigation last year (dunno the km). The inlet and exhaust manifolds were really quite clean.

Ron

Here's the story which i still haven't had a chance to read ;)

• Page 1
• Page 2
• Page 3
• Page 4