LPG Direct Injection or Conventional

Go direct gas injection, It is better in every way.

Take a look at 100scool@yahoogroups.com message no 9983, gives heaps of detail on injected LPG on the 4.5L twin cam (one of, if not the first to have it done). I have the older type of mix, and am happy with it, but can see the advantages in the injected type. I tow an 18ft caravan with mine, no problems with power.

What you refer to as Direct Injection LPG is actually sequential multipoint port injected gas injection. The gas is injected into the inlet manifold ports upstream of inlet valves, similar to gasoline port fuel injection. Direct injection is where fuel is injected directly into the combustion chamber. No commercial systems are available for DI LPG.

Didn't mean to detract from the question though. I would certainly opt for multipoint injected system. The reason that conventional diffuser systems suffer so much power loss is due to the gas displacing air. Air (or the O2 in it) is what produces power (when mixed with the appropriate amount of fuel). Less air = less power. The sequential port injection systems will give you improved performance, improved fuel economy, improved emissions and will be a lot safer. I am amazed that the 1st generation systems are still being sold.

Hugh

I have the same vehicle with a large conventional Impco setup on it. Hard to tell the difference betweeb LPG and ULP.

I reckon it's great.

If you do a search , i have just done a good report on 100 series with injection , ill try look for the post