4000cc, 6 cyl, CNG/ Petrol Issue. Some imp questions

[noman8ff]

@ uiv, Agreed. I think you must have installed your system between the air filter and the carburetor and thats why the bold reached the engine. I am planning to do it even before the air intake so no issues.

@ imtishal, As far as the venturi is concerned, if i am not wrong, on CNG it controls the air flow well but on petrol, some 15 to 20% air still remains blocked. And thats why your friend's car got the damage. So for an old vehicle like mine, some very little blockage is bad.

@ spectra, good idea. If its true, that will be amazing. Thanks.

[alee1]

alee1, brother thanks for the suggestions. Will work on it on saturday.

most wellc0me

[hshakeem]

6 rupees a km in army and isi jeeps, this is where all our tax money goes into

anyways

air blockage has no harm on cng . its all done to have a perfect combo of air/cng and to make the car iddle smooth
however on petrol, engine has to put more stress for air suction, economy and performance drops from the blockage

venturi also restricts air to some extent but if right now ur air intake is blocked 60 percent, even after venturi, still u would need to block the intake

i think the manual choke idea isnt bad if u frequent run the car on petrol. most cng users run car 99 perc on cng. so even if its 80 percent blocked, people dont care

If you give the required quantity of gas you do not need to block the air. Increase the gas flowing into the engine and unblock the air. the reason could be that the injector opening is too small or the gas adjuster is closed or even the CNG regulator is small for the engine.
Air blocking is very bad for the the engine especially for the the valves / head.
I recently converted my 2004 Honda Accord 2.4L to CNG without any air blockage using BRC sequential kit. Initially a smaller gas injector was installed resulting in Kit's ECU converting the engine from gas to petrol at 5700 RPM. But later with bigger injector this problem was resolved. With lite foot on throttle I am getting Rs 3 to 4 per Km at an average speed of 100 to 120 kph.
Before that I drove Daewoo Racer (with 5 speed gear box) and 1984 Honda Accord 1.6L with Badini CNG kit and 60L cylinder. On highway I use to regularly get over 200km per refill.
Cheers.

[hash4u]

dont u think they would have tried opening the gas at max and tried reducing it gradually to see if it can be set without blockages ?

i have a corolla with 220,000kms, own engine, intake partially blocked without any problems

sequential = SIS kit ? after spending money of 2 kits on one kit,good mileage makes sense. glad ur happy

[vvaheed]

I just finished making a true copy of a modified air control system from a hard paper. Now having food. In an hour or so will post pictures of the design and would like to have your comments so that i finally do it with the air intake.

I like ur air control system. thats really nice buddy.

[vvaheed]

i've got an intake (which means more than normal air) installed in my car (khyber carby) which is running on cng / petrol, the car performes exceptionally well on both kind of fuels. Air intake is installed on a ventury.there is no issue when the car is idle either on cng or on petrol. The only care i have to take is to keep the air filter clean i.e. Have it aired every now and then.

wow

[vvaheed]

WoooooW

[noman8ff]

So finally it's made.

It took me about 3 hours to make it with the help of my mechanic and than an hour in fixing it and adjusting the cable pulling mechanism.

The first picture is when the cable is not pulled, means air as per CNG. The inner plate blocked 60%.

The next two pictures are when the cable is pulled, means on petrol. The inner plate/ butterfly can be seen straight allowing 100 % air to flow freely.

[noman8ff]

Comments pleaseeeeeeeeee

[alee1]

this is so se*y.i l0ved that.the job is done fine and the perfection impresses me alot.
hows the performance?maybe i get to see it if i got a chance and permission by owner obviously.
kindly tell the size of your cylinder.milage.pick etcs

[noman8ff]

Brother you are always welcome. Whenever you come to isb, i'll show it to you and can give you some details about the fixing of the inner plate, etc etc. The pick is perfect as mentioned in the start of this thread. I have 2 cylinders, 50 and 55 each. Gets filled in around 875 Rs and gives me 185 KM's while driving above 120 and 230 KM's whils driving on 100.

[qwertypoiu]

Brother you are always welcome. Whenever you come to isb, i'll show it to you and can give you some details about the fixing of the inner plate, etc etc. The pick is perfect as mentioned in the start of this thread. I have 2 cylinders, 50 and 55 each. Gets filled in around 875 Rs and gives me 185 KM's while driving above 120 and 230 KM's whils driving on 100.

Excellent

[hash4u]

Noman congrats!
a job well done i must say.
now u will get the best out from cng and on petrol both!

[alee1]

yani u get 3.80rs/km if u drive at 100kmph and 4.7rs/km while at 120.
its exceptionally go0d milage.i get 3.2rs/km with 1.3litre engine.and you have 4litre engine... (clapping)

[memad]

@noman

I would suggest to have a look at the baleno's FF cng set up.It uses an electronic air blocker just before the air filter housing,and takes signal from cng kit,as soon as u convert the vehicle to gas the air blocker closes and when converted to petrol it open's up completely.But since ur jeep is carby so i guess u'll need to manually send signal for blocking/unblocking But i think it would be better looking and less hassle then cable operated set up.

Can you post a picture for the Baleno setup I think it is only provided in Baleno FF CNG as I have not seen any other car with auto air blocking device.

[hanimughal]

hat's off ..
awesome job bro..

[onlyfaith]

yani u get 3.80rs/km if u drive at 100kmph and 4.7rs/km while at 120.
its exceptionally go0d milage.i get 3.2rs/km with 1.3litre engine.and you have 4litre engine... (clapping)

thats good yar!

[wasif111]

looks clean

[Titanium]

Job Well Done !!!

[HamzahF]

@noman8ff
AOA, sir you mentioned in your intro para to the thread that your cruiser runs a single butterfly carb. that coupled with the exceptional economy figures you state lead me to ask if you have done away with the original carb and put in a different one. the original 3f aisin/aisan carbs are twin barrel/butterfly units. please clarify. thumbs up and regards.