How hard is it to rebuild these Toyota Carb's?

[Dean88]

Well, I am new to this site, but not new to the automotive world. I used to drive a 1985 F-250, but 7mpg was killing me, so I got an 86 Corrolla with the 1.6, but I think the carb needs rebuilding, but I've never messed with anything foreign, I rebuilt the Holley 650 on my truck with no problems, so I guess my question is this, can a shadetree mechanic rebuild a toyota carb?

[thenick]

I wouldn't see why not. I would also check out paradise racing as they have a Weber carb (32/36) that increases hp and gas mileage for $349 -- perhaps an alternative to rebuilding the stock one.

[Criard]

I've heard mixed feelings towards rebuilding these carbs. I've heard that it is a long and arduous process not worth the work.
I've also heard it's not too difficult at all. just get yourself a long bench and place things on it from left to right as you take it apart piece by piece, that way you know the order of what you took off and have a better idea of where it goes.
if you're mechanically inclined and just new to foreign cars, I think you can probably handle the task.


I've heard a lot of good things about the weber and holley carbs. increasing gas mileage is definitely not one of them. you're upgrading your fuel system and increasing the amount of fuel the engine is using, no extra miles to be had here. unless your current carb is shot and giving you less than normal mileage due to terrible mixture, then you could see a mileage increase from one of these carbs.
though with the 32/36 carb I have heard that gas mileage doesn't decrease too much and it's worth the extra 'oomph'. larger carbs like the 38/38 outlaw, or bigger, will noticeably decrease your mileage.

[thenick]

Originally Posted by Typrus

I am extremely pleased with the Weber.

Some history...With the old carb(which I rebuilt), the car started well and ran good. It had some rough idling issues but for the most part it was a dependable daily driver. My son has put approx 20,000 miles on it in the last 10 months. Gas mileage was a steady average 21.5Mpg.

The Weber gives it such a broader powerband. It pulls a LOT better down low. This was an issue especially with the larger tires. Highway hills that I used to gear down to 4th to pull, can now be pulled in 5th. On an offroad hill(fairly steep) & the old carb, the car would really bog, you had to keep the revs up and ride the clutch. Now it just walks up with no problem. My son even tried it in 2wd almost made it over the crest.

It really smoothed out the engine throughout the rpm's. Again, this could be attributed to disconnecting the emmissions stuff.

My son took it back over today. This is his daily driver and his words when he got home from work..."MAN.. What a difference." He too, is pleased. He said it evens sounds better.

Just checked gas mileage and the 1st tank through got 26.7 mpg. That is from 21.5 so not too bad.

This was a used carb off a BMW 2002. I did not rebuild it, just bolted it on. I may get my hands on a tuning manual and tweek it to improve the mileage. But if it didn't even get any better mileage, I think it was money well spent.

I figure at the rate he drives and gas prices, it pays for itself in less than 3 months.(ebay cost)

as posted on: http://www.club4ac.com/index.php?showtopic=109

[Criard]

you can't compare different gas mileages from different days and different driving.

also, as I mentioned before, if the old carb is not working properly and not giving correct mixture (which would lead to decreased mileage) you would indeed see a mileage increase with the new carb.

[thenick]

Originally Posted by Criard

you can't compare different gas mileages from different days and different driving.

also, as I mentioned before, if the old carb is not working properly and not giving correct mixture (which would lead to decreased mileage) you would indeed see a mileage increase with the new carb.

I'm not arguing with you -- I understand that gas mileage fluctuates. I'm just highlighting the difference between a newer carb and a 20+ year old one. Mind you the one the poster above me used was from a used BMW 2002; imagine buying a new Weber 32/36 I would imagine the results would be more favorable. I'll let you know when I get mine this summer

[Criard]

well met, nick. you are correct in certain aspects. good post you found too, I looked it up to see what else they had to say. there is a lot of very useful info there.


http://www.club4ac.com/index.php?showtopic=109
posted by Lateer:
"Mileage, Power, Smoothness All improved. Simple as that. Mileage improves as the Weber only supplies through very small <idle> circuits. Power improves as it can deliver heaps when it's fully open. Smoothness really depends on your right foot. If you're a leadfoot, then all three go down. If you're a gentle person, then the Weber will love you...."
"A simple carburettor modification is not the first thing to do. As an ancient textbook on IDF Webers told me, it should be the last thing to do. Make sure your ignition system, fuel pump, rings and pistons, bearings and valve train are in good working order before you put the Weber on your car, as the carburetor will make all these systems work that much harder and possibly cause one to fail. Expensively."
"...Basically, performance with the DGV comes down to your right foot. If you're a leadfoot, then you'll push more fuel than is absolutely neccesary through the Weber and end up fouling plugs and coating your exhaust with fuel. If you're nice and lightfooted, then the Weber will only deliver the amount of fuel required, no more, no less."





something to keep in mind though, that I found. this was in reference to a tercel, I don't know if their fuel pumps are any different than ours:
"Teddy--------------------------------------------------------------------------------

I would like to add an important "tech tip" here, since I didn't see it mentioned...

The Weber is SUPPOSED to get 3.0-3.5 lbs of fuel pressure... unfortunately, the stock pump on the US Spec cars puts out 7 lbs.

When I did my Weber conversion about 4 years ago, the local carb shop said "it didn't matter" so I installed the carb and loved it.

Way more power, better throttle response, better mileage, better EVERYTHING. As mentioned, ad nauseum.

However? After several years... I cannot help but notice the leaking seals all over the carb. Also, tuning the carb and ignition timing is a never ending affair... every four months or so, I had to advance/retard timing and/or adjust idle.

Why? Because seven pounds of fuel is TWO HUNDRED PERCENT more fuel pressure than the Weber is supposed to be connected to...."

[thenick]

Originally Posted by Criard

something to keep in mind though, that I found. this was in reference to a tercel, I don't know if their fuel pumps are any different than ours:

I'm glad you brought this up because it was one of the concerns I had when planning my carb upgrade. Do you if we are able to put fuel pressure regulators on our cars or are we limited strictly to an electric inline fuel pump? The reason I ask is because it would be a hell of a lot easier to install a FPR than an inline pump (although it's not THAT hard). That was the only issue I have with the Weber 32/36 upgrade.

And just a little eye candy for everyone...

[Criard]

I have no idea, personally. the person that posted about the fuel pump said they had plans to use a pressure regulator on their tercel.