Carburetor - buy or repair?

[psychdelicmervs]

Car:
Mitsu Galant SS 91

Problem:
Carburetor, has problems in what they call butterfly, result is, taas-baba ang idling, minsan nag iistuck sa mataas na rpm, lalu n pag naka aircon, tapos nag je-jerk pa, therefore malakas konsumo.

Repair?
I arleady went to Kamuning and have it reparied there but still unsuccessful, I guess hindi magaleng yung pinag pagawaan ko. Gusto kong i pa repair ulet pero I would need a super trusted repair shop. Please advise name of the shop, contact person, phone number and address, just to be sure.

Surplus?
Ok lang din saken kung surplus na carb, kahet from banawe or evang, basta match sa car ko at in good working condition, kaya lang hirap mag hanap, marami na kong natawagan na surplus shops pero wala, di pa ako napunta kase masayadong nakakapagod. Again, if you can refer a mitsu surplus shop that has surplus carbs, please send me the details.

Brand New?
Try ko din brand new pero price is too much, a new mitsu genuine carb is about P15k, damn.

[ghosthunter]

One more option:

Engine swap to EFI engine for your Galant.

[voltscastillo]

Car:
Mitsu Galant SS 91

Problem:
Carburetor, has problems in what they call butterfly, result is, taas-baba ang idling, minsan nag iistuck sa mataas na rpm, lalu n pag naka aircon, tapos nag je-jerk pa, therefore malakas konsumo.

hey man, you write like a technical writer, hehehe.

i'm sure there's someone else who can overhaul that carb of yours sa kamuning... hanapin ko muna yung recivo nung pinagpagawaan ko ng sentra ko na 93 model (pinasakal ko yung carb... yeah i admit mas eng eng ako sa kotse nun) pero way back '04 pa yun.

if the car's a keeper, maybe you can do an engine EFI type swap na nga lang just like boss GH said. i'm sure mas mura mga mitsu engines kesa honda (d15b 45k? hello)...

servitek ba ndi kaya? they have carb guys there.

maybe speedyfix. carbs aren't that terribly complicated naman.

[bondying001]

HI Tsikoteers,

anyone here na may alam kung san ang magaling na gawaan ng carb sa kamuning? any contact#'s? balita ko kasi dun daw ang may magaling na gumagawa ng mga carb eh... Mine is 4k engine and per mechanic na nakuha ko, sira daw ang carb at kailangan palitan.... i dont think so... hindi naman ganun ka complicated ang carb sa pagkakaalam ko eh kaya naghahanap ako na magaling mag overhaul ng carb.. anyone? Thanks

[H1Tman]

Try Mando of A&M Kamuning.

[duskylim]

Dear Sirs:

The impression that carburetors are simple devices is mistaken, they are actually quite complicated and very few countries in the world can DESIGN and MANUFACTURE them by themselves.

The critical tolerances on a carb are in the ten-thousand's of an inch (few microns) so not just anyone can make them.

As an automobile enthusiast, I did my own carb work, on Mitsubishi's, Toyota's and other engines.

I would not trust just anybody I have not seen work to with on my carbs.

I have worked with most twin-down, Mikuni Kogyo Solex, Aisin, Hitachi, and WEBER carburetors. Also side draft carburetors although for street use, I prefer down-drafts.

From your description, there could be several things wrong with your carb.

a) throttle plate - a sticking plate is rare, it usually happens if someone adjusted the idle speed screw too low, allowing the plate to dig into the throttle body of the carb - destroying it - you would have to change the carb's throttle plate assembly.

b) leaking throttle shafts - many people are not aware that there are throttle shaft oil seals on carbs, on occasion they will fail and leak - the bad news is they are hard to find and don't come with the repair kits.

c) bad idle set up - most people who call themselves mechanics in this country don't understand how carbs work, they just muddle along.

If you want to replace the carb with a surplus one, you must first know what a good carb looks like, if you don't and you buy a bad one, you're just wasting your money.

There are just too many, many things to look for to make sure you have a good carb. This cannot be taught in a few e-mails.

You also must be able to open up the used carb just to be sure that it's not blocked up or fouled-up. If you don't know how to do so, whats the point of buying a used one?

As an example, working carbs should NEVER be allowed to stand for more than several days with gasoline in them. If you do so, the gas corrodes the inside and forms a scale that blocks up the delicate passages, destroying the carb.

You may be better off buying a new one, at least there's a guarantee.

If you can afford it, buy yourself a WEBER 32/36 DGV progressive down-draft, carburetor from Redline Racing, about US$ 365 - once you set that up right, you will find it gives an excellent combination of economy and power.

If you have talent with electronics, you might want to convert the thing to EFI, but that's not a path for the weak or technically challenged.

To do so you will first have to find a suitable fuel injection system with injectors, manifold and piping.

Second you will have to purchase a whole series of sensors for that system to work.

To wit: A throttle-position sensor; A Mass-airflow sensor; A Manifold-absolute pressure sensor; An inlet air temperature sensor; an engine temperature sensor; a cam-position sensor; a knock-sensor; an exhuast gas oxygen sensor (wide band).

Then you will have to wire and pipe the thing together.

Good luck and Best Regards,

Dusky Lim

[psychdelicmervs]

To Dusky, thanks for the detailed reply. You have a point in buying a surplus carv, the question of how can i be sure if its a good carb, that I do not know.

I have no budget for EFI or would stay away from an engine swap as I might be getting a defective engine - and still will be paying some cash for the swap.

I will try again to have it repaired. So i need advise on a good shop in Kamuning that can fix my carb.

[Tepperz]

HI Tsikoteers,

anyone here na may alam kung san ang magaling na gawaan ng carb sa kamuning? any contact#'s? balita ko kasi dun daw ang may magaling na gumagawa ng mga carb eh... Mine is 4k engine and per mechanic na nakuha ko, sira daw ang carb at kailangan palitan.... i dont think so... hindi naman ganun ka complicated ang carb sa pagkakaalam ko eh kaya naghahanap ako na magaling mag overhaul ng carb.. anyone? Thanks

try nyo kay mang danny sa ADO carburators.. dun ko lagi pinapagawa carb ko eh.. although toyota yung sakin.. located sila malapit lang sa mindanao ave. pag lagpas mo ng quirino ave. i think 2 streets lang makikita mo na signage nila.. try ko hanapin contact no. nila.. HTH

[H1Tman]

try nyo kay mang danny sa ADO carburators.. dun ko lagi pinapagawa carb ko eh.. although toyota yung sakin.. located sila malapit lang sa mindanao ave. pag lagpas mo ng quirino ave. i think 2 streets lang makikita mo na signage nila.. try ko hanapin contact no. nila.. HTH

Eto yata ung recommended sa grupo toyota?

[1D4LV]

Car:
Mitsu Galant SS 91

Problem:
Carburetor, has problems in what they call butterfly, result is, taas-baba ang idling, minsan nag iistuck sa mataas na rpm, lalu n pag naka aircon, tapos nag je-jerk pa, therefore malakas konsumo.

Repair?
I arleady went to Kamuning and have it reparied there but still unsuccessful, I guess hindi magaleng yung pinag pagawaan ko. Gusto kong i pa repair ulet pero I would need a super trusted repair shop. Please advise name of the shop, contact person, phone number and address, just to be sure.

Surplus?
Ok lang din saken kung surplus na carb, kahet from banawe or evang, basta match sa car ko at in good working condition, kaya lang hirap mag hanap, marami na kong natawagan na surplus shops pero wala, di pa ako napunta kase masayadong nakakapagod. Again, if you can refer a mitsu surplus shop that has surplus carbs, please send me the details.

Brand New?
Try ko din brand new pero price is too much, a new mitsu genuine carb is about P15k, damn.

get a brand new replacement carb or have your current one repaired.
servitek have some carb guys...

[bobreyes]

If you will be within the vicinity of Evangelista, Makati, in front of the Iglesia ni Kristo look for Mang Vising. He's recommended for carb overhauling.

Question: how much kaya magagastos kapag pinalitan engine ng Mitsubishi Galant 1991 (2.0 engine) ko that still uses carb to the one that's EFI?

[bobreyes]

..........

[koring]

OK naman po sa A&M carburetor specialist try nyo po dun. kapag po nag je-jerk problem po nyan sa "primary plunger" bk po barado kaya d smooth ang daloy ng gas.. magiging pino po takbo nyan sabay Tune up na. na experience ko na din kasi yan. dun po ako nag pagawa.

[ELSINORE]

May problem ako mga Sir sa gas consumption ko 3.65 km/per liter lng ang tinatakbo ng oto ko.
3k na carb nakakabit sa 12valve 1500 engine n nkakabit sa 89corolla small body na dapat 10-13 km/per liter ang gas consumption ko. ok naman na ung timing bagong palit sparkplugs ko nsa tamang idling na pero walang pag babago sa konsumo ng gasolina
tanong ko lng kng dapat po ba na kumuha ako ng 4k na carb or okay n ung 3k na carb

Your Opinions are greatly appreciated


Salamat pO!

[duskylim]

May problem ako mga Sir sa gas consumption ko 3.65 km/per liter lng ang tinatakbo ng oto ko.
3k na carb nakakabit sa 12valve 1500 engine n nkakabit sa 89corolla small body na dapat 10-13 km/per liter ang gas consumption ko. ok naman na ung timing bagong palit sparkplugs ko nsa tamang idling na pero walang pag babago sa konsumo ng gasolina
tanong ko lng kng dapat po ba na kumuha ako ng 4k na carb or okay n ung 3k na carb

Your Opinions are greatly appreciated


Salamat pO!

Sir:

3+ km / liter is just goddamn UNACCEPTABLE! With gas almost Php 50/liter its also quite PAINFUL!

Lets see if I can help.

Lesson No 1 - Carburetion begins at the air filter and ends at the tailpipe.

Q - Did you change your exhaust system, pipes and mufflers with bigger ones?

Big exhaust pipes and mufflers often cause a big drop in BOTH the acceleration and fuel economy because they completely upset the fuel system's sensitivity, making the engine burn rich. - they LOOK good but they perform BAD.

Look at the tailpipe - is it black and does it smell of gasoline when the engine is running?

Does it drip water on cold mornings? - those are the symptoms of rich (excess gasoline) mixtures.

In this case the solution is simple - put the original exhaust system BACK! Unless talagang ikakamatay mo ang pagpoporma.

If you did not touch the exhaust system, make sure that the rest of engine is OK - that is:

i) the ignition system is OK - spark plugs, high tension wires, timing, etc.
ii) the valves are correctly adjusted
iii) the engines' mechanicals are ok - no loose compression, good temp, no blowing of oil or etc.

Then and only then it is time to blame the carb.

Regards,

Dusky Lim

[duskylim]

Dear Sirs:

Here's part 2 of my previous post:

If you are now getting serious with carb repair, then here are the 1st steps to a overhaul.

1) buy a good quality carburetor repair kit for your carb.
2) determine the correct specs for your carb - very important, you cannot set a carb by 'estimate' or 'tancha' - its just IMPOSSIBLE - you NEED the SPECS!
3) carefully remove the carb from the engine, keep it UPRIGHT ALL THE TIME and bring it to a clean worktable
4) dismantle it slowly, remembering where all the parts go - make diagrams or drawings if needed.
a) take off the external springs and locks 1st
b) then remove the screws and carb cover be careful not to damage the gaskets and seals - just in case you need them.
c) check whether the float level is correct - you will need the specs here
Note: you cannot tune a carb UNLESS the FLOAT LEVEL is CORRECT - all other systems depend on this being right!!!
d) check the float bowl's condition, is it clean? are there deposits and fouling? if the system is blocked the carb is DEAD!
e) take off the jets, primary idle, secondary idle, primary main, secondary main, power/enrichment, accelerator pump, etc. - inspect them for dirt and blockage, soak them in a strong solvent and blow dry and clean with compressed air.
f) use high-pressure compressed air and a strong solvent to clean the carb's body.
g) record all the jet sizes and numbers, and compare with those of the repair kit. If the original jets look OK just change the seals or o-rings (kung meron lamang) and put them back. If the sizes/numbers are the same on the replacements look to see if the holes/orifices are the same size - if so, then you may try using them.
h) re-assemble your carb with the new gaskets and seals - fill the bowl with a mixture of gasoline and solvent for starting reconnect all lines, springs and cables and you're good to go.

Regards,

Dusky Lim

[ELSINORE]

Thank yOu for the REply Sir. I really Appreciate it, Regarding your theory I had already replaced major parts of it, 1st. I had it tuned up I have changed the sparkplugs changed the oil even had it tOp overhauled I have to change the distributor to a contact point one because the one I had before was broken by a moron who rev's my engine like it was a saturn engine like his, So off I go to banawe to get me the same electronic distributor which caused me 7k in total cause the dude from the not so called store say's the 1st one had to be broken and I have to get a new one which he so called say's he's custom made but the replacement was not compatible with my engine so I end up getting a 400php worth of distributor contact point type, lovely huh?..., anyway I changed the muffler to a new stock one have to change the rear end of it and even the middle I dont want to get a big muffler for my car because I dont have a big engine anyway and besides even if I'll have a 4e engine lets say in the near future I wont get a noisy muffler for it ,I just want it to be stock as simple for now, since I was given a tip by a gentleman from this forum I guess I would take his advice
to get rid of my stupid carb and blow the sh#$t out of it for good..
hahaha..



Any more advice will be greatly appreciated.,



Thanks Again!

[ELSINORE]

Sir.
I would like to ask your jetting recommendation for a 12valve 1500 engine used in a corolla small body car..
and would you recommend using a 3k carb instead of a 4k carb..


Thank You!.

[duskylim]

Sir.
I would like to ask your jetting recommendation for a 12valve 1500 engine used in a corolla small body car..
and would you recommend using a 3k carb instead of a 4k carb..

Thank You!.

Dear Sir:

I really can't recommend any jetting till I see the original specs. Finding the correct jet sizes is a matter of extensive testing.

You've got to get the basics right 1st - float level, smooth idle and progression. Then you can play around with the main jetting.

I do recommend keeping the original mufflers and exhaust system intact.

Do you have any experience in overhauling carburetors? If not then I don't recommend you do it yourself.

Replace your air filter regularly every oil change, blow clean with air every weekend.

As to the carburetor type, both of them are AISAN carburetors. However the newer models have all sorts of anti-pollution equipment built in and tend to be very finicky to tune and run.

Simple is always better in my book - go for the simplest carburetor available - the early model 3K series.

Hope this helps.

Best Regards,

Dusky Lim

[johncarlo]

Sir I have this (leaking throttle shaft on my carburator,thanks to duskylim theory) of my small body 2e engine 92 model all stock po exhaust system, is there any remedy from this or is it good should I buy a replacement na lang?,sometimes kasi when the engine is warm na, nag jerk ang car in second gear or pag nag slowspeed na ung andar ng auto saka medyo malakas din sa gas,during accelaration naman wala cyang problema.