RiceRocket

i am looking for anyone that can give me any info on a prpane injection system. supposedly this system uses injected propane to allow for you to run more boost. anyone implemented it? absolutely any info would be appreciated

Icemark

Properly set up propane injections systems increase HP two ways:

One, they cool the intake charge, increasing combustion efficency.

two, they add extra fuel to the mixture.

Now how to set up one properly that I couldn't tell you, but I would imagine that there would not be any big HP increases unless you used a Haltech or some sort of non-stock fuel management system.

vaughnc

why not NOS, it does the same thing.g

dre_2ooo

NOS kills engines.... but let's NOT get into that debate..

BLUE TII

iTrader: (9)

Propane injection is popular on turbo diesels, but I have never heard of it on a gas turbo car. One thing that makes Propane very different than nitrous is that it does NOT release oxogen durining combustion and so there is a lot less chance of destroying your engine by running lean.

mazdaspeed7

Lets clear something up here. Nitrous does NOT add fuel. It only adds extra oxygen to the intake charge. Thats why you must also inject gas with it. Propane adds JUST fuel. It doesnt add any extra oxygen.

Propane injection would be great for turbo cars for 2 reasons. One, its extra fuel, aside fromt he stock fuel injection system. Two, it has an octane rating of about 120. So if you set it up right, you can run a lot more boost.

Icemark

But the BTU output from propane is considerably lower than gasoline, so that extra octane may be a big trade off for lower output.

NZConvertible

The propane topic has come up before and I found it interesting because its use in the automotive field seems to be so rare in the US. There are literally thousands and thousands of vehicles in Australia and New Zealand running solely on Liquefied Petroleum Gas (LPG), of which the major component is propane. It’s cheaper than petrol and the power loss is small, about 5%. It also has practically zero emissions. It’s available in quite a few gas stations in the cities, but is harder to found outside the major centres. Some manufacturers even offer LPG-powered cars off the showroom floor.
I’ve seen some very successful performance engines running on LPG, everything from big mega-hp V8’s to rotary turbos. Turbos take to LPG quite well due to the fact it has an octane rating of ~114! This means the small loss in power is easily regaining by adding 1-2psi more boost, with the potential for more.
BTW, the energy rating of a fuel (BTU, kJ/kg, etc) is misleading because it doesn’t take into account the flow rate required for complete combustion. An extreme example of this is the nitromethane they use in top fuel dragsters, which actually has a lot less energy (by mass) than petrol. But because you need eight times as much for a complete burn, you end up with two or three times as much energy available!