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Old 03-02-2008, 07:54 AM   #1 (permalink)
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Default air-fuel mixture

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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Old 03-02-2008, 05:39 PM   #2 (permalink)
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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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Old 03-02-2008, 09:34 PM   #3 (permalink)
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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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Old 03-03-2008, 12:38 AM   #4 (permalink)
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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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Old 03-03-2008, 07:23 PM   #5 (permalink)
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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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Old 03-03-2008, 10:45 PM   #6 (permalink)
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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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Old 03-03-2008, 10:53 PM   #7 (permalink)
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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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Old 03-03-2008, 11:47 PM   #8 (permalink)
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Quote:
Originally Posted by zaviatorz View Post
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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Old 03-04-2008, 11:34 PM   #9 (permalink)
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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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Old 03-05-2008, 08:39 PM   #10 (permalink)
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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.
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