rejetting a carby?

[newbien]

is it possible to re-jet my standard 3tc single throat carby?

i was thinking along the lines of 36 cause i cant quite afford a 32/36 twin carb

any help is very much appreciated

cheers

[SeptemberSquall]

is it possible to re-jet my standard 3tc single throat carby?

i was thinking along the lines of 36 cause i cant quite afford a 32/36 twin carb

any help is very much appreciated

cheers

I think you're misunderstanding. When you say "thinking along the lines of 36" does this mean you want to modify the size of one of the 3T-C carb throats to 36mm? Which throat, the primary or the secondary? And what are you trying to achieve by this?

Not to mention that the throat sizes have nothing at all to do with jetting or "rejetting". Rejetting the carb is possible, yes, but that will have no effect on the physical size of the carburettor throats, just the size of the jets and the amount of fuel they consequently deliver.

Finally, if by 32/36 you mean a Weber 32/36 DGV or DGAV or similar, then they are (a) not expensive (relative to the cost of modifying your 3T-C carb in the manner you've requested), and (b) not actually a "twin-carb" as you've suggested. The 32/36 refers to the primary and secondary throat size and in this respect the carb is of the same design as your stock 3T-C carb.

I recommend more research and a clearer idea what you're trying to achieve, pm me if you would like me to clarify.

[TRAV-KE55]

Newbien,
I had a 32/36 carbi on my 3t as a road car and i couldnt recomend them enough, they are justa really nice progressive little carbi that is easily tunalble, and it will be a noticeable diffirence over you standard 3t carbi. Dont bother with the standard carbi, save a bit more and get the 32/36
Trav
PS: I also used the 32/36 on the same engine after the engine was modified and used it in competition with good result A++ i say!!

[rob1]

Or a better option I believe, is to try and track down a 38/38. They are pretty hard to find but well worth it.

[bnicho]

The 38/38 (or more correctly a 38DGMS) was designed for a 3.0L Capri V6 engine and would be overkill on a 3TC engine.

A 32/36 DGV or DGAV would be fine. They were fitted to 2L Cortinas and escorts, so they can be easily found at wreckers and on eBay. But as previously said, you need to post more info about what you want to achieve.

[rob1]

I ran a 38/38 on my 3tc for 2 years and it was driveable, and had good power! I got mine off a bloke that was running it on a 2.6 rodeo.

[MWP]

I ran a 38/38 on my 3tc for 2 years and it was driveable, and had good power! I got mine off a bloke that was running it on a 2.6 rodeo.

Itll run fine, sure, but itll be a bastard to tune and will end up running too rich to stop low-vacuum lean conditions.
Bigger is not always better!

[bnicho]

Itll run fine, sure, but itll be a bastard to tune and will end up running too rich to stop low-vacuum lean conditions.
Bigger is not always better!

Exactly. I have spent a lot of time working on these carbs. The chokes in a 38 are simply too big for a stock 3TC. The top end would be fine, but it would be very flat down low and economy would be lousy. A 32/36 would deliver better power, driveability and economy except maybe at 7,000rpm plus.

[CoronaC]

bnicho - I noticed in another thread ( http://www.toymods.net/forums/showthread.php?t=926 ) you were talking about the different types of 32/36 carbies, im just trying to find out what cars have the 32/36DGEV carbies on them?

Also when it comes to rejetting carbies, how easily is it done? I was thinking of trying to find a 32/36DGEV and cleaning it up then giving it a rebuild, but im unsure of what i have to do for the rejetting and tuning (i would be getting it tuned at a shop). Would this be something better left to someone that knows what there doing or can it be done by anyone fairly easily.
My aim would be to get a little better fuel economy without sacrificeing power (2S-c cant afford to loose any more power )

cheers
chris

[newbien]

what cars are the 32/36's on, and where would i get a manifold to suit a 3tc

[MWP]

Also when it comes to rejetting carbies, how easily is it done? I was thinking of trying to find a 32/36DGEV and cleaning it up then giving it a rebuild, but im unsure of what i have to do for the rejetting and tuning (i would be getting it tuned at a shop). Would this be something better left to someone that knows what there doing or can it be done by anyone fairly easily.
My aim would be to get a little better fuel economy without sacrificeing power (2S-c cant afford to loose any more power )

Rebuilding a Weber isnt too difficult.
You just have to make sure you remember where everything goes... there are a lot of small parts.
When doing the couple ive rebuilt before, i took photos of the carb as i was taking it apart. That way if i cant remeber where somthing goes, i can refer back to the photos.

Tuning a carb (re-jetting), is 50% science, 50% black art.
Its difficult to do and can take a looong time to get correct... even when you do have the right tools (lots of jet sizes, wideband EGO meter, dyno, etc).
Rebuild the carb, then take it to an experienced carb tuning shop (not just your local mechanic or ultratune!).
Or even better, get them to rebuild the carb as well.

[bnicho]

MWP is right. The rebuilding is the easy part. Usually the rebuild kits come with exploded diagrams of the carb components anyway.

You can get the jetting right with a lot of experimentation. But it's best to get it done professionally by someone who understands these carbs. Otherwise you will have to buy a lot of jets you don't need anyway.

The only other option is find out what jetting someone else with exactly the same engine is using.

I'm not sure what cars had the 32/36DGEV. Maybe whatever car it was used on was never released in Australia, so you would need to buy one new. They are very rare second hand as most people fit a DGV and use a choke cable.

BTW if you want to be stealthy, modify the factory 2S-C air filter to fit on the weber. That way it looks stock under the bonnet and you don't have any EPA/RTA/VicRoads/PinkSlip/etc. hassles.

[TRAV-KE55]

I cut the base out of a ford laser/323 1500cc air cleaner and made a new base to take the webber, it looked all factory when finished as the heat riser pipe was above the ex. manafold heat riser and even had a factory cold air air tube fitted. Painted it the factory ford laser blue and you couldnt tell and the air cleaner elements are cheap as chips. Also the breather also hooked up really well as well.
Trav

[CoronaC]

So basicly just look for a DGV? which cars have these on them and how do i find that i have the right one?
Whats involed with fitting a choke cable from a DGV, is it just running the cable into the cabin?

Also with the acc. cable is there any mods that need to be done to that to fit ir properly or is it the same setup as the 2s-c carbie.

I was going to rip the manifold of my parts corona so i might as well take the air filter and fit that to the carbie while im making an adaptor plate. What type of material should i use to make the adaptor plate and how thick should it be?

Might as well ask, does anyone know some decent jet sizes to get to have better fuel economy and a little more power?

BTW, sorry for hijack

cheers
chris

[bnicho]

There are probably more DGV's fitted to Geminis/Nissans/Toyotas now! They frequently turn up on eBay too.

DGV webers were fitted to early-mid 70's Ford Escorts and Cortinas with the 2litre "Pinto" engine.

The late 70's models of the same cars have the DGAV which has the "wet" automatic choke. These are far more common. You may be able to plumb in the wet choke, or you can get a manual choke conversion kit which replaces the wet choke.

The choke cable is easy to fit, just fit it in the dash somewhere you can reach it and feed it through a firewall grommet.

On most japanese engines you can simply unbolt the throttle arm from the original carby and bolt in on the Weber as the throttle spindles are the same size. Then you will need to fabricate a simple bracket to hold the accel. cable sleeve. It should be fairly easy to sort out.