Carter BBD rebuild - Page 9 - JeepForum.com

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post #121 of 151 Old 03-14-2014, 10:26 AM Thread Starter
moto450r
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Quote:
Originally Posted by Mike Romain View Post
I have always used the rebuild kits directions to get my results.
I like your results too! Maybe I'll get this turd there some day.


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post #122 of 151 Old 03-14-2014, 10:55 AM
Mike Romain
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Quote:
Originally Posted by moto450r View Post

I like your results too! Maybe I'll get this turd there some day.
Rpm range is a big part of it. Get the rpm too low on these flying bricks and the engine lugs in wind or on any grade which just drinks gas. It is a carb so more pedal used, more gas used basically. If you have to floor it to adjust for wind or slope, you are in too high a gear. My 3rd pulls hard to 75 mph if needed to pass or climb. 4th buries the speedo easily.

I have 3.31:1 gears and 33's so I never use 5th gear. It makes the engine turn around 1850 or so at 65 mph which give me at the most 15-18 mpg. I stay in 4th at 2300 rpm and the gas mileage goes Way up. Same for in town, it never sees 4th.

High octane also give a big boost in power and mileage. A sweet extra 100 miles per tank for about $7.00 extra a fill up over regular and a lot more top end throttle response.

They really don't like alcohol mixes, just kills the power and mileage, let alone rots out gas lines and carbs. Even the CJ owners manual says to only use an alcohol (ethanol is alcohol) blend if you are out of gas and need to get to real gas.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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post #123 of 151 Old 03-14-2014, 11:50 AM
LumpyGrits
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Mike-Unless you corrected the speedo drive gear in the t'case for your 33's.
Your not do'n 65mph/1850rpm.
A GPS will prove your true ground speed.
The SB I spoke of, is what I was told buy a Jeep mechanic many-many years ago. When I made an inquiry about why the FSM showed one way to ck the gap and the rebuilt sheets show another. I never saw that SB(if there was one).
I was told then, and still follow what the rebuild sheet says that comes with the carb kit.
LG

Have'n you along, is like loose'n 2 good men
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post #124 of 151 Old 03-14-2014, 12:12 PM Thread Starter
moto450r
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Quote:
Originally Posted by 86cj74.2L View Post
.8 to.9 is a good idle mixture setting.
At Idle it was dropping to almost 0.

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post #125 of 151 Old 03-14-2014, 01:03 PM
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Quote:
Originally Posted by moto450r
At Idle it was dropping to almost 0.
With all the timing the O2 sensor may be cooling off. Or try opening the fuel screws a little more and see if it responds.

But once again you need a DVM not a analog meter.
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post #126 of 151 Old 03-14-2014, 01:04 PM
Mike Romain
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Quote:
Originally Posted by LumpyGrits View Post
Mike-Unless you corrected the speedo drive gear in the t'case for your 33's.
Your not do'n 65mph/1850rpm.
A GPS will prove your true ground speed.
Yes I have used 3 different GPS units over the years and all have said the speedometer is right on. Cops seem to agree too, have never been nailed for speeding in it and cruise at 120 kph all the time on our 110 kph limit highways.

Quote:
The SB I spoke of, is what I was told buy a Jeep mechanic many-many years ago. When I made an inquiry about why the FSM showed one way to ck the gap and the rebuilt sheets show another. I never saw that SB(if there was one).
I was told then, and still follow what the rebuild sheet says that comes with the carb kit.
LG
I only saw the FSM years after using the kit directions. The Haynes manual also has the correct drawing which is what I was thinking about at first I guess.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #127 of 151 Old 03-14-2014, 01:11 PM
Matt1981CJ7
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I think the only possible way a CJ speedo reads correctly with 33" tires is to change the gear in the t-case. Even my 32"s cause the speedo to be about 10% off at any given speed. Perhaps the PO swapped the gear out.

Matt
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post #128 of 151 Old 03-14-2014, 01:20 PM
Mike Romain
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Quote:
Originally Posted by Matt1981CJ7 View Post
I think the only possible way a CJ speedo reads correctly with 33" tires is to change the gear in the t-case. Even my 32"s cause the speedo to be about 10% off at any given speed. Perhaps the PO swapped the gear out.

Matt
My t-case gear has been changed. I test out on "measured miles" also. We have km markers now, but same deal, 10 of those give my odometer 10 too.

That needs to be considered when figuring mpg too!

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #129 of 151 Old 03-14-2014, 02:02 PM Thread Starter
moto450r
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Quote:
Originally Posted by 86cj74.2L View Post
With all the timing the O2 sensor may be cooling off.
That is my suspicion.

I'll be testing with my DMM today.

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post #130 of 151 Old 03-14-2014, 02:29 PM
86cj74.2L
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Quote:
Originally Posted by moto450r
That is my suspicion. I'll be testing with my DMM today.
or you have an exhaust leak. And reversion is sucking air into the headpipe
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post #131 of 151 Old 03-15-2014, 07:20 AM
John Strenk
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I was thinking of installing a heated O2 sensor into my exhaust manifold at one time. there can't be any different than the non heated ones as far as the sensor works.
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post #132 of 151 Old 03-15-2014, 08:02 AM
scooby533
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Correct me if I'm wrong but the heated sensors allow use further downstream in the exhaust. I know the O2 sensor needs to be a specific temp. to make the chemical reaction work and that in turn is transmitted in voltage to the computer. I would think the heated O2 sensor placed before the Cat or the muffler a few feet from the exhaust manifold maybe pointing up towards the tub would be better than the stock AMC placement.
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post #133 of 151 Old 03-15-2014, 08:06 AM Thread Starter
moto450r
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Used the Fluke DMM to do a test drive yesterday and it read the same as the analog multi-meter when at speed. The Fluke did have a .8v reading at idle vs. the analog that kept falling to almost 0v. I didn't make any adjustments yet.

I'm going to drive the Jeep to work in a few hours, I'll post what I see on the Fluke. I'm interested to see what the mixture reading is when I'm at the 5000' summit.

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post #134 of 151 Old 03-15-2014, 08:18 AM
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Take some small tools and go for a drive and stop a few times and tweek the needles to .4-.6vdc while driving on a flat road.

The step up piston has a vacuum operated enriching circuit (that spring under it) so you want to be on a flat road just cruising along. Under a load the vacuum drops and doesn't pull down on the needle barrel as hard letting the spring push up on the needles making the mixture richer than normal.
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post #135 of 151 Old 03-15-2014, 01:47 PM Thread Starter
moto450r
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Here are the numbers I was seeing on the way to work .....
Straight and level driving , 2200' at 55mph .
.
.
.
Almost to the summit. I wanted to get a comparison while still doing 70 mph because the speed limit drops to 50 mph before the summit
.
.
.

At the summit 50mph, hard to read .858v
.
.
.

The readings were changing during stop and go but for any given steady speed I was seeing .8+

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