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Discussion Starter #1
guyz i'd like to ask if how can i determine that the vehicle is in its proper air-fuel mixture during combustion?
how can i set the air and fuel adjustments properly to have a good combustion?or what is the indication that i alrdy set the vhcle in proper air-fuel mixture?bcos my suzuki carry consumes 1 liter of gasoline for just 8.7 kms when i tested it by directly putting a hose in its carburetor from a liter of gasoline,i adjusted it so many times i cannot hit the target of proper mixture,and it losses its pwer cnsuming a lot of gasoline.
any response will be highly appreciated thank you and more power guys!
 

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hello usually when i check proper mixture on a carb engine, I start from the lean side and rev it up. If it can't rev up than its too lean. Than after every adjustment I look at the spark plug, I see if it has a nice copper color. If its sooty black its too rich. Or maybe its not just a problem with your mixture, how about your timing. the proper timing for a F6A engine is 5 degrees BTDC at 900RPM.
 

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Discussion Starter #3
Zuki thanks for ur reply,my another problem is that the 1st cylinder consumes a lot of oil during cmbstion causing a thick carbon buildup in the spark plug,cos when we change the piston ring we used the oversize cos the bore in the cylinder is not in a stndrd size anymore,i am not satisfied with the work of the mechanic,i found out that f only the carburetor was checked properly and the air-fuel mixture it doesnt need to change piston ring,cos the old rings we found out that stll in a very good cndition.My problem with the mixture was that i made many ajstments but after a few days it will goes back to the same problem.yup ur correct the timing also needs to be check.
when i strted the vhcle it will take a few kilometers before it to stabilize the engine,if u will not step on the accelerator the engine rattles and will going to stop even the idle is high,do u have idea about this?
i really appreciate ur reply to my 1st post thank u very much.btw where u from?
 

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Sounds like you need to check the timing, try to find a mechanic who uses a timing light
to properly check this problem. Try to change your old spark plugs & check the
clearance (abt. 0.7~0.8mm) before you install the new plugs. Mine is EFI so I don't
have any idea on the air fuel mixture. Although I admit to have "curiously" tinkered with
the inlet air adjusting screw (with rubber stopper/cover), I try to listen to the sound
& check the idle RPM. As the sticker below the engine hood says, 900 plus minus 50RPM.
But mine is set to 1,500 to compensate my not-so-good alternator, supplying only
13.8V (w/o lights, accessries ON) & 13.1V with all acc. ON.

Anyone here also tinkered with their inlet air adj. screw? How many revolutions or
complete 360deg turns did you set from full close/shut??? Mine is 2 1/2 turns.
I'm trying to observe if my fuel consumption will increase if I open it more (more air),
or vice versa.

Does a big amount of air intake means strong acceleration? high idle RPM? and high
fuel consumption???
 

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maybe your problem with your number 1 cylinder wasn't the piston ring but a leaky valve gasket. oil could've been leaking from above. and about your shaky idle it could be because your piston ring is too tight. its oversized right? after your engine warms up, the piston chamber expands allowing more clearance for the piston ring. Oh and im from the philippines, manila.

Bruce Li i think the inlet adjustment screw is purely for the idle adjustment. if you want more intake, check out my other thread for the do it yourself K&N air filter. definite increase in power there.
 

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Discussion Starter #6
high intake of air that is not in proper proportion to ur fuel ma cause ur power to reduce and may consume more fuel,that is one of my problems about the mixture,setting high ur rpm idle just like stepping on the accelerator consuming more fuel,cos when u adjuts the idle screw it pushes the lever that is pulling the accelerator cable.
 

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Discussion Starter #7
to Zuki,thanx pare,when we change the piston ring we check also and replace all the 12 seal valve,we use oversize ring its too tight in the bore so we reduce the circumference of the ring using sand paper,if u totally close the air adjustment screw,how many counter clockwise turns i will aplly in order for it to be set in proper opening of the screw?
btw im from Bacolod,hehe sem ata tayo ng bday
 

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btw im from Bacolod,hehe sem ata tayo ng bday
Sir zaviatorz, I'm also from Negros Occ. but I'm from Victorias city.
I spent 5 years in UNO-R Bacolod taking up BSME. Now I have my
work & family here in Cebu. (I'm 100% ilonggo!!!)

Regarding the inlet air screw:
Maybe you mean the other screw with the tension wire to adjust the
gas pedal or acceleration. The inlet air screw i'm referring to is sort of
"forbidden" to be adjusted obviously since it's covered with rubber
& you need to take it out first before you can adjust the screw.
I have read that when you adjust this screw (for EFI vehicles), you
need to "reset" the Engine Control Unit (computer box) by taking out
the fuse or the battery for a while.

I'll post pictures of that screw later.
 

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to zaviatorz, hi anyway my wife is from bacolod city, we were just there two weeks ago. anyway since my zuki is efi not quite sure, but most carb cars i've worked on are usually 2 1/2 turns out to 3 turns. If not right just bring it to a carb specialist. should adjust it for only a few hundred pesos.
 

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Discussion Starter #10
To Bruce Li
im from Talisay City,I spent my 1st Supervised Indstrl Training there at VMC,im a 5th yr BSME student at TUP-Visayas heheh kababayan.
 

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Discussion Starter #11
To Bruce Li
Sir Li im from Talisay City,I spent my 1st Supervised Indstrl Training there at VMC,im a 5th yr BSME student at TUP-Visayas heheh kababayan.
What i mean is the idle screw is the idle that will also increased ur fuel consumption if adjusted and not in proportion to ur fuel mixture. i c,cos my zuki is very basic it has 2 screws for the idle and air intake which has a copper color. my unit doesnt have an ECU cos its a very basic type an F6A engine with carb,manually adjusted making it difficult for me to set the air-fuel mixture properly,btw thanx a lot,i tought ur also asking about adjsting the idle screw hehe. Thanx again God Bless
 

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Discussion Starter #12
To Zuki
okay sir thanx il try to adjust it in that number of turns,before il make adjusment it should be that the screw is fully shut?ill make adjustment counter clockwise or clock wise if i set it first fully open?.il try it in a carb specialist if it will not work hehe,thanx a lot,ah i c,so nice uve been here in bacolod with ur wife,u
 

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To Bruce Li
im from Talisay City,I spent my 1st Supervised Indstrl Training there at VMC,im a 5th yr BSME student at TUP-Visayas heheh kababayan.
So you will graduate this March? My younger brother Ace also graduated
from TUP-V, but he's 3yrs. older than you maybe???
Maybe you know Ronnie Cuenco from TUP-V also? He came here in my
company to sell there products.

To: zukidelight

2.5 to 3 turns for Carb & 7 turns for EFI?
Mine is only 4 to 5 turns but my idle RPM is already 1300.
I think I saw your engine photo, it might be an EFI, though I miss the
part with the fuel injector railings. If I se it, I'm sure it's EFI.
 

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Yup my car is EFI. anyway i took my throttle body apart one time and cleaned it completely. Back then i just counted how many turns it was until it was completely shut. but I still adjusted it to get my rpm at 900 no a/c.

To zaviatorz, start from completely shut and turn out to 2.5 or 3 turns. Not sure though but try to rev it up and see if it stutters. if so turn to half a turn more out. Acceleration should be nice and smooth. Oh and do this after your engine has warmed up. Anyway yup had a good time in bacolod. went to manbukal and sipalay city. very nice beaches :)
 

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Discussion Starter #15
what kind of engine is the EFI?u,ok thanx il try it tomorrow,mambukal really improves a lot and it was rehabilitated now,in sipalay yup there are lots of beautiful white sand beaches there i have not been in sipalay but i saw it in tv and pictures then i have classmates from sipalay
 

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Discussion Starter #16
to mr Bruce Li
our graduation is on April 4,cos of holy week there were changes in our schedule,we are just bz ryt now preparing for our thesis presentation and defense next week,is ur younger brother took up BSME at TUP-V sir?,about Mr. Cuenco his name sounds familiar,btw sir may i know the name of the Company u r working at?r u in Cebu sir?
our carry doesnt have a tachometer for the RPM,is there other way that i can measure the RPM?
 

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To bruce correction on the air fuel mixture screw for the EFI engine, i counted mine and it is 3.5 turns out. Sorry must've been thinking of something else.
 

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To: zaviatorz

My bro took up the 3yr course Engineering Technology & he finished his
BSME while working in Manila. BTW my company name is Tsuneishi Heavy
Industries, Inc., & I'm still here in Cebu. Been working here for 10yrs. It's
my first job. Oh, if you don't have a tachometer, there's no way you can
determine the RPM. Even the expert mechanics can't be sure by just
listening to the "sound" alone. If you won't buy & install a tacho, the safest
way is to listen to the engine. Our small engines can be silent enough to
moderately noisy. But I bet you already have an idea if you're engine's
idle RPM is high. So just stick from low noise to moderate. When your engine
heats up (5min.), step on the gas a little & if acceleration is good, it can
be ok, but if it starts to stall or die, you may consider increasing the idle RPM.

To: Zukidelight

Thanks for the info, but I adjusted mine 2 days ago to only 2.5 turns.
If I go leaner on the air, will I consume more fuel?

Yesterday I found out another screw, still connected to the air inlet.
Don't know if this is what they call IACV (inlet air control valve).
Let me show you some photos.

The first pic is what I tinkered earlier. Is this the screw for adjusting the
air intake?

View attachment 5163

Do you guys know what is this for?

View attachment 5164
View attachment 5165

Appreciate your reply . . .
 

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Discussion Starter #19
Guyz thanx a lot for the info about the adjustment in air-fuel mixture i fix the carry and made set it 2.75 turns it improves my fuel consumption from 8.7kms to 10 kms travel in 1 liter. btw my carry is a 12 valve 4x4,I hope i can be able to improve it better thanx a lot.

To Bruce Li
i c,maybe i can recognize his my schoolmate if i see him,sir we will go there in Cebu on March 25 for our Industrial Tour if our IT will not change our first schedule campony visit is Tsuneishi=) Kita Kits lang ta da sir hehe.yup sir im just using my senses in approximating the rpm usually i used to look at the emmision and listen to the sound of the engine,then im drivng it to test and feel its power if ok,its difficult to set the ryt mixture if i will not drive it and adjust again and again until i can hit the target.

sir about the pix uve posted:
is d screw ur asking is the one near in the coil spring?maybe its the screw for the piston of ur brakes in which u can adjust the flow of the brake fluid,im not sure if i am correct
 

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To zaviatorz:

No, the screw is far from the piston brakes & it's still somewhat connected to the
air intake, though indirectly.

See you soon here in Tsuneishi. If your tour will push through just inform the guard
to call me (I'll PM you my local number).

To zukidelight:

Sir,

Good morning.
I think that screw is only for adjusting air intake, not air-fuel mixture since the fuel supply for EFI's is separate (through a fuel rail). Don't know in a
carb engine, but you can check on the photo below. Is my set up same
as yours?

View attachment 5183
 
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