Thread: LPG & K's Per 100

Originally Posted by p38arover

I can get better than 13 litres/100km in my P38A ----- on petrol.

Best I'v ever done is 18L/100ks in a rangie on petrol, how many L/K's you
geting on your lpg set up ron ?

just as an aside here just done the fuel consumption for the boss's SIII after its first long run, and the old girl was'nt to bad,18.6 mpg (uk gallons) or 15.2L/100

Tony

Hey Ron / P38,
14.6 litres per 100kms if I worked it out right, Dedicated lpg. I thought you were going to do all the calculations for us.
I could never get that out of her, more like 18-20 litres per 100kms,but I would always push the speed limits and often towing a trailer or camper. Dad does not tow much with it and normally sit on 100-105 rather than 110-115. I reckon that extra 10kms makes a hell of a lot of difference.
Cheers
Craig

Originally Posted by CraigE

Hey Ron / P38,
14.6 litres per 100kms if I worked it out right, Dedicated lpg. I thought you were going to do all the calculations for us.
I could never get that out of her, more like 18-20 litres per 100kms,but I would always push the speed limits and often towing a trailer or camper. Dad does not tow much with it and normally sit on 100-105 rather than 110-115. I reckon that extra 10kms makes a hell of a lot of difference.
Cheers
Craig

G`day Craig ,

I work things out at klms per Ltr and yours comes in at 6.8 k/L

From the figs quoted so far that`s the best , next is sly at 5.8k/L

The fig you have is what Pro-Inc is chasing out of his 66ltrs , to reach 450 klms .

What is special about this engine ?

Manual?Auto ?

Exhaust ?

Cheers

The best I've done out of the old LPG venturi set up was 17 litres/100 on a 500+ km trip . The same trip on petrol got 13 litres/100km.

Two days ago on petrol on my 38A - 12.9 litres/100 and yesterday on LPG 18.6 litres/100km sequential vapour injection.

Originally Posted by PLR

G`day Craig ,

I work things out at klms per Ltr and yours comes in at 6.8 k/L

From the figs quoted so far that`s the best , next is sly at 5.8k/L

The fig you have is what Pro-Inc is chasing out of his 66ltrs , to reach 450 klms .

What is special about this engine ?

Manual?Auto ?

Exhaust ?

Cheers

Dedicated Gore / Gas research lpg system and manifold. Only runs on lpg. 4.2 litre Stroker motor, extractors, 5 speed R380 box.
Nothing real special.
Like I said those figures are my Dads and he does drive a little more conservatively than me. I would guess on open highway he would sit on 100-105kph. I used to sit more like 110-115kph. My figures used to vary but were more like 18 litres per 100kms unloaded and taking it easy and up to 25 litres per 100 kms with a load and trailer giving it a hard time. Average for me arounf 20 litres per 100kms.
The strange thing is and I did notice it in the RRC and a Pajero that I had on lpg was that as soon as we hit SA the economy got better. Now I do not know if they have a slightly different mix for lpg or environmental conditions have an effect but economy improved by about 20%. My FIL was a Gas depot manager and in the the mix in WA used to be slightly different and gave better economy. Sometime in the 90s this mix changed in WA and economy dropped. Lots of people actually commented to my FIL on this. At the time I had the Pajero and an XE Fairmont on lpg and did notice a sudden change in mileage. Odd. My FIL did tell me exactly what the lpg ratio change was but I do not recall the figure. The official line from BP and Kleenheat gas was it had no effect.
Also bear in mind that if you fill up on a freezing cold night and then drive, then fill up again in the heat of the day your economy will appear to change markedly due to expansion and contraction of gas depending on size of tanks. There were in fact a couple of fills on cold nights where I am sure I got in 10 litres more than would have been normal.

Thanks Craig

I guess there may be something in the combination of the research system , extractors , manual gbox, 4.3 ( higher comp ) and being gas only .

Though i think the main things are the research manifold the the 4.3 and i pressume , the country covered is fairly easy going ?

Was the ignition modified in any way from std , other than i would pressume advance the timing ( dissy rotation ) ?

Would you have a pic of the underbonnet you could post , i pressune the twin carby part was cut off the manifold to adapt the research ?

Your worst 4klm/ltr is the same as the fig given by mark2s 4.3 .

Dirtydawg at 3.6K/L , could possibly find improvment , which is the worst , so far .


Our D/Fuel Impco set up gives a bit better than 5klm/l on average but will give better and has room to improve and it`s pushing through an economy/power sucking T/F auto and is 4.0ltr .

Cheers

Originally Posted by PLR

Thanks Craig

I guess there may be something in the combination of the research system , extractors , manual gbox, 4.3 ( higher comp ) and being gas only .

Though i think the main things are the research manifold the the 4.3 and i pressume , the country covered is fairly easy going ?

Was the ignition modified in any way from std , other than i would pressume advance the timing ( dissy rotation ) ?

Would you have a pic of the underbonnet you could post , i pressune the twin carby part was cut off the manifold to adapt the research ?

Your worst 4klm/ltr is the same as the fig given by mark2s 4.3 .

Dirtydawg at 3.6K/L , could possibly find improvment , which is the worst , so far .


Our D/Fuel Impco set up gives a bit better than 5klm/l on average but will give better and has room to improve and it`s pushing through an economy/power sucking T/F auto and is 4.0ltr .

Cheers

I dont have any underbonnet pics and it is in SA with my Dad.
The manifold is not the standard manifold but a German made low profile manifold (name escapes me, maybe Offenhauser) and from memory was 4 barrel spread bore design (I remember this because if I went back to dual fuel I could have put a Holley 465 spread bore carby straight back on). It is possible that the timing and ignition have been altered to suit and I would even assume this as it runs like a dream on lpg where most dual fuel conversions are a compromise. It has electronic ignition rather than points as was standard. I think the stroker was built by Jagspares in SA, from memory that is what is on the crank. From my understanding of the previous owner the stroker build up was done to match lpg. Not sure exactly what was involved.
Cheers
CraigE

Thanks Craig ,

that makes it clearer , no need for a picy , i know what it is now .

I had read that single plain/plane ? manifolds were the go for lpg and it seems like your proving it .

Cheers