Thread: Diesel with LPG kit??

You guys are all bagging out RobA for a post if you read it is about moden diesels having issues not 200 and 300 tdi's or 4BD1's which is what alot of you are saying you have had no dramas with. Older diesels and moden diesels are different. I wouldn't put gas on a modern diesel, i would get the ECU remapped if I wanted more power.

We are not bagging out RobA at all,many of use have LPG/Diesel vehicles and all of us have heard the stories,over and over. Pat

Clearly there is a problem with some modern diesels if you add too much LPG and forget to add EGT monitoring to prevent engine damage. The Peel controller for example has an EGT probe directly wired to the control unit to shut down the LPG flow whenever exhaust temps reach a set limit.

Diesel LPG Injection

Truck quality diesels like the Isuzu 3.9 have enormous reserves of strength, whereas modern light/medium duty diesels like the 2.7 have limited head room for extra power. Like I wrote earlier in this thread, the important thing is to is to know what your engine is doing and not drive like an idiot. I suspect that there are more idiots buying new vehicles and blowing them up than there are buyers of 10 year old vehicles and wanting to keep them for years.

Originally Posted by 85 county

sounds like bollocks to me, plenty of 300 tdi 4 bd1 T's running around SA with LPG fumigation, and since they all seem to have Lower EGT's when LPG is turned on and opposed to being turned off.
the same rubbish story is repeated often by people who all know some one whose best mate knows his second cousins neighbour is an expert

I did not suggest the engines were LR and if you want to take on the technical ability of our certified practising engineer I will be happy to introduce you. My information was provided in regard to LGP conversions and diesel engines nothing more. I can assure you the bright blue line around each piston at TDC was without doubt due to extremely high combustion temperatures. Every engine is different in many ways but the consistent finding has been this can and does happen with all engines up to and including direct injection. Older engines are not without risk as we have seen even non-turbo's have failures.

My simple advice based on that is to explore options carefully and that is based on what we know as fact

Rob

Originally Posted by RobA

I did not suggest the engines were LR and if you want to take on the technical ability of our certified practising engineer I will be happy to introduce you. My information was provided in regard to LGP conversions and diesel engines nothing more. I can assure you the bright blue line around each piston at TDC was without doubt due to extremely high combustion temperatures. Every engine is different in many ways but the consistent finding has been this can and does happen with all engines up to and including direct injection. Older engines are not without risk as we have seen even non-turbo's have failures.



Rob

i am more than happy to take on the technical ability of our certified practising engineer, bluing is a temp related problem but is more indicative of a frailer of piston oil squirter, so thus it is a modern motor problem.

the Fact remains that LPG fumigation lowers EGT, however you are stating LPG conversion of diesel motors which is a totality different game.

this thread is about LPG fumigation, so what exactly are you talking about?

lastly, how can you claim

My simple advice based on that is to explore options carefully and that is based on what we know as fact

when all you are actually doing is repeating a story you herd form some one else? that's the same as saying my mate had a LR and its was crap so all land-rovers are crap

Keep it civil thanks fellas.
Andrew

I should point out that EGT's are only lower on LPG if you back off the diesel use to maintain the same output power. Using it to increase full load power will increase EGT's , the question of how much it does this compared to diesel increase only is an interesting one, but the chances are that its a small difference.

For example, a stocky Pajero 2.8 TD that I converted a few years ago was fitted with an EGT gauge so I took it up the SE freeway. This is a long constant gradient. At 100km/h in 5th with the cruise engaged switching on the LPG saw a drop in EGTs from 650C to 625C. In the process the accelerator pedal moved back to reduce diesel use to maintain the same power output. Switching the lpg off again saw a return to 650C. Had I nailed the accelerator instead,not only would EGTs have risen but it would have gone much faster than the speed limit on that stretch.

Oh and 5 years later the engine is still going fine as the owner isn't stupid and keeps an eye on the gauges.

How many of the LPG fumigation systems out there monitor EGT and other engine parameters and feed it back into a fumigation ECU? Not many?

I believe that the one developed by Diesel Gas Technologies/GasTek does. A few people on here have them on their 4WDs.