My CNG conversion

[Dirtrider_ak]

Ok, hope my information helps.

 

Cheers

 

It does help, will look into it man. It makes sense to me also. Thanks again for sharing with all the forumers here. G47 and me will take yr tips .... and go back to the shop and ask them to check hehehe .... nothing much I can do with the hoses man, it is clamp tight and under warranty ....

Edited April 15, 2008 by Dirtrider_ak

[Stevewish]

Hi,

Whether to convert or not, really up to individual. My colleague never drive his car to Malaysia ever since his car was stolen four years ago. He only top up petrol in Singapore and eventually converted to CNG last year due to the increasing petrol price. Perhaps, CNG conversion is a better option for him.

 

Regards

[Gilbertaue]

Dude,

 

Don't worry. Your pipes are all of the same length. That is 101 of CNG installation...

[Genie47]

Does the lengths account for bends on the tubing? Velocity of the gas going through slows when there is a bend.

[Boyboy]

ah.. manual..

 

the problem is i will be driving manual too

 

nvm.. see how next time. i do agree with u on the choices thingy. tt is why i considering to get CNG for my next ride. then, it will definitely make sense because it is effectively free (not to mention discount on ARF or dunno what).

 

actually, i don;'t see the malaysian taxis stalling, and they are lao pok chia (mostly manuals i think) running on CNG. the CNG altis taxi i sat in when i was in BKK also seemed to not have much problem. except some shudder at low rev but hey, it's a CAB!

[Boyboy]

for those who never go to JB, CNG does make sense.

[Boyboy]

eh i ask you ah.. u stall is it because u never rev enuff, or u step too much gas and the cylinder is flooded with gas?

 

if stall because of former reason, then i think stalling is pretty easy to avoid. just rev like a noob driver driving stick shift for the first time. but if it's the 2nd reason, then really need some skill liao

[Genie47]

Theirs is the fumigator AKA mixer. D_ak and mine's are supposed to be exactly metered solenoid injectors. We are not supposed to lose much power but apparently nailing the low revvs is a problem. The CNG ECU mirrors the petrol ECU and modifies the timing of the injection with the duration. So in a sense it is pretty dumb. Got to nail it right for all the RPMs encountered.

 

I don't stall easily now but I do need to give the car more oomph before moving off. Just like a WRC car.

[Genie47]

Flooded with gas. Explains the afterfires. BAK BAK POK POK VROOOM.......

Edited April 16, 2008 by Genie47

[Dirtrider_ak]

Dude,

 

Don't worry. Your pipes are all of the same length. That is 101 of CNG installation...

 

Repect your answer. But what could cause these situation really puzzled. Any insights?

[Sswh218]

One top up of CNG (9kg)in my car only gives a mileage of about 80Km at a cost of about $11. This is bad news as the nearest CNG station is in Mandai which is 20km away from where I stay. To and fro to the Mandai station would be 40km which The 2 cylinders are of 25 litres each which gives a total of 50 litres. I am wondering what can we do to increase the mileage?

 

1) Increase CNG cylinders tank capacity from 50litres to 80 litres?? - This would mean retrofitting the carpentry work of the storage cabinet housing the CNG tanks. This would also cost money. Anybody have done this before? What is the estimated cost?

 

2) Pump in more CNG into the existing tanks?? What is the maximum pressure that a CNG tank can withstand? Or should the question be what is the maximum pressure the inlet of CNG tank can hold before the CNG 'burst' out?

 

3)Fine-tuning of the sequential fuel injection system? What exactly is that? Any other fine-tuning needed in the CNG system to increase mileage?

 

Why do I hear that Picnic CNG car or Vito van can run a mileage of 180-200km while equally sized SSangyong Actyon car can only manage 80km on 1 full top up of CNG?

[Dirtrider_ak]

80KM is too less. Something is wrong. anyway mine is 66.5 L which is I think 70L tank which give me a range of 250KM and heavy foot ard 180~200KM.

 

That is very high consumption and may not for your case. Then again mine is manual so may make a difference. and my car is only 1.598L capacity.

 

I think better check with the installer on your expectation. I really can't tell y yrs is so high.

 

Service pressure of tanks are 200Bar

Edited April 17, 2008 by Dirtrider_ak

[Gilbertaue]

You have to see it in relation to your petrol consumption. Is that high too?

Any Ssangyong is known to have high fuel consumption.

 

You can fit more pressure into the cylinder. It's only supposed to take 200bar and not more. If your mileage is not high then add another cylinder.

 

Tuning won't increase you mileage to 180. Maybe the tuning will increase it by 10%, but not more.

[Gilbertaue]

Bends are not a problem. But if the bend becomes a kink, then it is a problem.

The maximum allwoed for the pipes is 30cm and that is taking into effect any bending.

 

 

Rgds

[Gilbertaue]

Guys, found out that someone has set up a Singapore CNG forum:

 

http://sgcng.free-forums.org/

[Genie47]

Hyperlinked.

 

 

http://sgcng.free-forums.org/

[Dirtrider_ak]

thks

[Genie47]

Eh? Saw you on TV (CNA) when they did the CNG car report together with BG bringing LNG to SG.