UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1 - Page 3 - Chevelle Tech
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post #31 of 44 (permalink) Old Dec 19th, 06, 5:02 PM Thread Starter
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

1) PLEASE ,from now on, do not post junk irrelevent to the topic.

2) OK, anyways, i changed the air filter and put in 5 new plugs. I cannot get the pass side rearmost plug (#6?) wire off because i don't have that tool. The car seems to run real good now.
The plugs, when i took them out had a little tanish look around the electrode and the metal part about the electrode. What does this, if anything, mean?

You would think that a 231 in a monte carlo/ G body would be easy to work on. But noooooo. A small block is actually easier to change plugs than a 231. Your comments on this?
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post #32 of 44 (permalink) Old Dec 19th, 06, 5:24 PM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

The tan color on the plugs is a good sign. Even better is that they are not black and carboned up. This means that your engine is in fairly good shape. Put in a new air filter, air up your tyres and drive the damn thing. You have never specified what kind of driving you do, ie: stop and go city type, or 45mph continuous hi-way type. 17 mpg in town driving on that car is excellent, so stop trying to fix what is not broken.

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post #33 of 44 (permalink) Old Dec 20th, 06, 8:49 AM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

Quote:
Originally Posted by Stewart G. Griffin View Post

You would think that a 231 in a monte carlo/ G body would be easy to work on. But noooooo. A small block is actually easier to change plugs than a 231. Your comments on this?


try changing the same rear plug on a turbo Buick!


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post #34 of 44 (permalink) Old Dec 20th, 06, 6:10 PM Thread Starter
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

So, how do you change it?
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post #35 of 44 (permalink) Old Dec 20th, 06, 6:14 PM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

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Originally Posted by Stewart G. Griffin View Post
So, how do you change it?
You remove the plug wire, unscrew the old plug with a counter-clockwise motion, remove it, screw in the new plug with a clockwise motion, snug it down and re-install the plug wire.
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post #36 of 44 (permalink) Old Dec 20th, 06, 6:23 PM Thread Starter
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

Veerry funny! YOu know, you should be a GD comedian, you know that? You must have some life to just be able to sit at the computer and make totally useless wisecracks. (i'm being sarcastic in case you can't tell)


Anyways, i can change the plug with my universal joints if i could just get the wire off. I don't yet have that special wire removal tool.
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post #37 of 44 (permalink) Old Dec 20th, 06, 6:27 PM
 
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

pull really hard. As Andy69 says "if it breaks, it needed replacing anyway"
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post #38 of 44 (permalink) Old Dec 20th, 06, 6:36 PM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

Special wire removal tool? If you can't reach down and pull the wire off, use a long screwdriver to pry it loose. A new wire only costs a few bucks, so I wouldn't spend a lot of time trying to save the old one.
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post #39 of 44 (permalink) Old Dec 24th, 06, 2:12 AM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

If you need plugs, you prolly need wires to. (sic,op!)

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post #40 of 44 (permalink) Old Dec 26th, 06, 5:39 PM Thread Starter
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

FURTHER IMPROVEMENTS!


OK, we are now up to 18.79mpg which is a good improvement over last week. But still, admitedly, not where i feel it should be because again, i had an 85 SS which got 19.8 AND the thing had a 305 not a 231 so i would think that a 231 should be able to get 23-24 ish.

Changes from last week:
The new plugs and air filter seemed to help (the engine sounded better). But also i had replaced a front tyre; Ruth(previous owner) had installed some off brand maypops which is ok because she really didn't do that much driving (car only has 66K) These tyres were not even round AND they were underinflated; i did not want to inflate them to the proper pressure because i only wanted to make one change at a time.

So not only did i change one of the fronts to michelin "rainforce" (which i think is actually a discontinued model), i inflated all the tires to 35psi. The rears are uniroyal nailguards. (these were also laying in my garage.) i feel the type and brand of tyre make all the difference in the world and can mean up to 1mpg improvment.

Even though i have decided (somewhat reluctantly) to sell the car now, as is, other ideas for further MPG improvement might include:

1) installation of a duct system to connect the the airhorn on the aircleaner housing routed to the front of the car so as do allow the carb to pick up colder, denser air vs. hot, "dirty" air underhood. This might account for a 1%-2% increase in mpg.

2) Jacobs electronics has a spark optimizer sort of device that allows for more complete combustion of the gas. They're claiming 15% improvement in mpg. The idea does sound good.

3) Switch to electric fan from pulley driven clutch-type fan. We might pickup 1%-2% here.

4) Chopping the top and/or lowering the car. Probably not cost-effective. Although we could see upto a 15% increase in mpg due to the drastic reduction in wind drag.

4.5) Exhaust/headers. This is a big one. And increases of up to 10% are probably very realistic.

5) Switch to EFI. i know holley sells complete bolt on kits for v-8s for $1000 (kit+plus you pretty much have to use one of their manifolds---i don't think a quadrajet manifold will work). The problem is i don't know if it would work on a six cylinder. I think we could see a 10% increase with this system.
Also, we have to factor in if it will be cost-effective. I feel that if you drive 600 or more miles per week, this system will pay for itself and start saving you money very quickly.
As it is now, i only commute about 100 miles per week, so something like this would probably not be cost-effective.

Do you have any other ideas to increase mpg.

So, anyways i did learn that you should take care of the basic maintenance stuff first, then try to diagnoise the more complex stuff later.
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post #41 of 44 (permalink) Old Dec 26th, 06, 6:18 PM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

Quote:
Originally Posted by Stewart G. Griffin View Post
Do you have any other ideas to increase mpg.
Sure.....

1. Put key in the ign. switch.
2. Drive to 7-11
3. Pick up Recycler/Auto Trader
4. Look for 'Honda'
5. Find a vehicle applicable to your intense struggle for more mpg

Honestly, if you're willing to throw money to a EFI setup and all this other stuff that's not going to amount to much, just for a few more miles to the gallon, AND it seems you have no real interest in performance.....buy a vehicle thats purpose in life is to get great mpg and be a back and forth driver. You've pretty much reached the mpg limit of your stock carburated mid-size vehicle.

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post #42 of 44 (permalink) Old Dec 26th, 06, 6:22 PM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

Again,forget about 23-24 MPG with a carbed 231..I highly doubt it.
BTW,85 Monte SS's had 3.73 gears too...another gas mileage killer..thats why you got 19.8 MPG
Put a 2.73 or 3.08 gear instead of 3.73 and that Monte SS would have got more than 19.8

You get the last plug with a universal and 1/4 drive ratchet with a 3/8 adapter FYI

..and now after all this knowledge posted on the subject you are:
Quote:
Originally Posted by Stewart G. Griffin View Post
i have decided (somewhat reluctantly) to sell the car now, as is
..and don't believe all the hype that after market ignitions provide better MPG
Its a bunch of marketing BS

...well said too Trevor


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post #43 of 44 (permalink) Old Dec 26th, 06, 6:36 PM
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

dude..... you're joking right?

you would go through chopping the top/ lowering it, putting on efi, and all kinds of rediculous stuff to get better gas mileage? from all the thing you stated you would get roughly 54% better gas mileage, bringing you up about 10 mpg from your current. so you would spend THOUSANDS of dollars to get you what? 28.5 or so mpg??

with all the things you just said, you could have bought a 4 cyl. and saved LOTS of time and effort. not trying to sound mean and i realize you said you were planning on selling the car......i just hope you know how much of a PITA that would be for such a marginal gain.

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post #44 of 44 (permalink) Old Jan 14th, 07, 12:39 PM Thread Starter
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Re: UNDERSTANDING THE QUADRAJET CARBURETOR 2, Pt.1

OK, we are now up to 19.1 MPG. I did more highway driving this week. This is still not what i consider to be "good," but it is, nevertheless, an improvment.

I feel that the reasons why my monte carlo SS got better fuel economy---with 74 more cubic inches are as follows:

1)higher compression
2) less restrictive exhaust
3) better aerodynamics; The front end on SS's not only looks good but provides 15% better aerodynamics then a regular monte carlo. The cars today from GM can't match it in looks. And you wonder why GM is in trouble, anyways..........
4)Lockup converter
5) overdrive
6) The carburetor had some electronic controls
7)Good flowing heads; The same heads as the cross-fire z-28 and corvette.

So, it seems that a used monte carlo SS may actually be more economical than a used regular monte carlo. It doesn't seem logical but that's how it is, seemingly.

Anyways, what is happening now is that after leaving a traffic light or stop sign sometimes is that i will be getting a slight stumble for a split second or so. No big deal, the car runs fine otherwise.
What do you think the problem is?
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