to straight GAS or Dual....

[PaRaDoX]

hey guys.. got lpg going in very soon,

im thinking of running straight gas, then i can remove my cat converter due to emmisions and regain power... and remove my petrol tank to get rid of some weight, on the other hand petrol would be useful incase i run outta gas...

[CSL]

think more about premiture motor wear before anything else and then weigh up your options, upper cylinder lube cann be good but for how long you know what i mean

[CSL]

or look into gas injection

[HoZy]

My previous motor was on gas for 16years... Only reason i changed motors i found a SV3800 Motor for cheap... This motor 2years on gas an still going hard...

Cheers
MaT

[pandaman]

think more about premiture motor wear before anything else and then weigh up your options, upper cylinder lube cann be good but for how long you know what i mean

If you are running hardened valve seats (and all unleaded motors do) you would be very unlucky to run into problems due to poor lubrication of the inlet valves. If LPG is so incredibly bad for the valvetrain why is it that taxi's can commonly get upwards of 500,000km being run on LPG only without a single valve failure? Every single sob story I have heard about LPG killing valve gear has been because some numbnuts has run LPG on an engine designed for leaded petrol with soft valve seats, (there was a perfect example in another recent LPG thread around here actually) the effect is similar to if they ran straight unleaded in it. So in a VN which is what the dude is talking about, gas would do just fine, if you wanna be really careful upper cylinder lube wont hurt.

In answer to the original question, straight gas all the way. The one and only reason to stay dual fuel is in case you run it out of fuel which is never a good idea anyway. That problem has a simple solution as well, don't run the bugger out of fuel.

[HoZy]

I like dual, I can get 550km tank of gas, 500km tank of petrol...

Means i can drive for 1000km Highway or Interstate..... Without having to fill up...

Cheers
MaT

[greenfoam]

Straight gas is the only way, it leaves you with so many options for legal modifications that you didn't have before that there's no sense running dual fuel

[Emackulation]

Hmmm, the more i hear about this the more I want to get Full LPG system and scrap the old petrol.

[SlowVac]

I'll go stright gas if I use the gas injectors also if I'm rebuilding my engine specifically for gas.

Cheers

[anton1o]

Straight Gas, Get gasresearch happening.

[Emackulation]

www.gas-injection.com
There you go fellas, im guna get one of those systems installed once they come out into production. In the mean time i will try and get the Normal LPG conversion done.

[holden007]

Straight gas is the way, remember duel fuel puts more weight on your car.

[Cheap6]

im thinking of running straight gas, then i can remove my cat converter due to emmisions and regain power...

Actually, you can't (remove the cat.). Even with a straight gas setup, all emissions gear, with the exception of that for evaporative emissions (carbon canister etc.) must be in place, together with closed loop mixture control. You can swap/add a gas carb. and make engine internal changes to suit LPG though.

[greenfoam]

Cheap6, I'll need some documented proof to believe that radical statement!

[burnz]

duel fuel handy, but not efficient
gas only, more efficient (porpose biult)
petol only, most efficient

[pandaman]

Cheap6, I'll need some documented proof to believe that radical statement!

Yeah, if what the man says is true, I was driving a massively defectable bomb for two years that managed to get through two blue slip inspections. In NSW anyway I am absolutely certain that LPG bypasses emissisions requirements.

[pandaman]

duel fuel handy, but not efficient
gas only, more efficient (porpose biult)
petol only, most efficient

Hmm, basically true, especially by old school standards. Some of the new LPG vapour injection systems are looking very promising in terms of fuel efficiency though. Anyway, while it may be less fuel efficient in most cases, the fact remains that LPG is generally more cost efficient.

[Emackulation]

Everyone knows that LPG has a higher RON rating right? And as i was researching these LPG injection systems such as Gti Stealth I found that the power curve is higher then petrol.

[burnz]

true but the gov is offering you 2large to convert
makes me wonder when 50% tax goes on

[burnz]

Everyone knows that LPG has a higher RON rating right? And as i was researching these LPG injection systems such as Gti Stealth I found that the power curve is higher then petrol.

that is true higher octane means you can put more
fuel in without flooding and generating more power

[adam69]

In 2011 it will start to be taxed and it wont be worth having.I was in NZ early last year and gas and petrol were the same price so it was costing more to run on gas.i bet it will happen hear too.

[greenfoam]

The plan is lpg untill 2011 then start playing with electric motors , who knows what the price of petrol will be in 2011, could be anything

[burnz]

The plan is lpg untill 2011 then start playing with electric motors , who knows what the price of petrol will be in 2011, could be anything

any year any time gov wins you must lose
murphy's law of tax

[xcop5l]

your all forgetting one thing POWER LOSS, the power loss ranges from 15%less (perfectly tuned) to about 80% less (complety detuned)
i have dual fuel and there is a major difference between the fuels when i get the gas dyno tuned ill get the stats and post them.i have the stats for ULP when i find them.lol
also if its not tuned rite v6s have a habit of back firing and blowing air boxes to bits.

[greenfoam]

I Have a friend with a 5 liter and had it on the dyno with both fuels and lost 5rwkw on gas that's not enough to be noticable and I'd say with more timing on the gas he would have got that 5rwkw back (gas research). But you would gain power with the liquid gas injection