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Little Blue 82

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Ray Cecil

Re: Little Blue 82

Jim. Ive installed a 3 row Aluminum radiator to keep things cool. I daily drive the truck. Ive been stuck in traffic in 100 degree weather and the needle never moves. That radiator does a great job. I dont think I need to keep anything fancy to increase idle.

Ill get the new choke in the mail Thursday. Ill get it hooked up then.

Also, what pulls the hot air up the tube into the choke? Is there supposed to be a second line drawing air through the choke housing? Is there an internal orifice pulling the hot air in? Or does the heat just rise in the tube because hot air rises?

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

ArdWrknTrk

Re: Little Blue 82

Administrator

Ray, I'm not sure with your Cali emissions factory carb.
Some carbs have an internal passage that provides vacuum.
Afaik, all electric assist, thermal choke carbs use vacuum from some source to draw heat across the spring.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Little Blue 82

Administrator

Yes, there's a small orifice in the carb that provides a little vacuum to the port where the tubing fits. The intent is that you'll have a line from the clean side of the air cleaner, down to the exhaust, and then back to that port. The vacuum pulls the hot air across the bi-metallic spring.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

Ray Cecil

Re: Little Blue 82

Gary Lewis wrote

Yes, there's a small orifice in the carb that provides a little vacuum to the port where the tubing fits. The intent is that you'll have a line from the clean side of the air cleaner, down to the exhaust, and then back to that port. The vacuum pulls the hot air across the bi-metallic spring.

Gary, the clean side of the air cleaner is under vacuum. So, is the vacuum from the choke housing orifice greater than the vacuum on the clean side of the air cleaner? Do I need to run my copper back up towards the air cleaner?

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

Gary Lewis

Re: Little Blue 82

Administrator

There should be a port on the carb that just goes into the air horn, where the air is clean. Probably the one in the pic below from the FSM. That air will be cool so you can run a vacuum hose from it to the copper tubing.

And yes, the vacuum in the choke will overcome any vacuum in the air horn.

Gary, AKA "Gary fellow": Profile

ArdWrknTrk

Re: Little Blue 82

Administrator

In reply to this post by Ray Cecil

There's no appreciable vacuum above the carb unless your filter is a filthy oily mess.
It's fine going there..

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

1986F150Six

Re: Little Blue 82

Administrator

In reply to this post by ArdWrknTrk

On my truck, when I switched to the YF from a 1970 F350, I went with a manual choke kit. It was less than $15 and easy to install. It also acts as a security system since many of today's drivers do not know how to set a choke!

Ray Cecil

Re: Little Blue 82

1986F150Six wrote

On my truck, when I switched to the YF from a 1970 F350, I went with a manual choke kit. It was less than $15 and easy to install. It also acts as a security system since many of today's drivers do not know how to set a choke!

Good idea. I think Ill get the automatic thing going first. I might upgrade to a Fitech 2 barrell setup eventually.

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

FuzzFace2

Re: Little Blue 82

In reply to this post by Gary Lewis

Gary Lewis wrote

There should be a port on the carb that just goes into the air horn, where the air is clean. Probably the one in the pic below from the FSM. That air will be cool so you can run a vacuum hose from it to the copper tubing.

And yes, the vacuum in the choke will overcome any vacuum in the air horn.

Did you miss my post back on think page 27 with pictures of how the hot air path works?

FuzzFace2 wrote

Gary Lewis wrote

Yes, you can run heat to the carb with a header. Use some of the soft tubing Jim talks about for brake or fuel line, and wrap it around the header two or three turns. That'll warm the air up in the tube quite nicely. You might want to put some insulation on the return, but it'll work.

Copper tubing is better, it will not rust out and is easier to bend.
Poor man headers ... EFI manifolds

If you need to run pre-heat to the air filter you can make the tin from sheet metal and/or tin cans to catch the heat and use the paper hose up to the filter housing like stock.
I have not done this and don't know if I will have to only time will tell.
Dave ----

Dave ----

Dave G.
81 F100 flare side 300 six / AA OD / NP435 / 2.75 gear
http://cars.grantskingdom1.com/index.php/1980-Ford-F100?page=1
81 F100 style side 300 six/SROD parts truck -RIP
http://cars.grantskingdom1.com/index.php/1981-Ford-F100

ArdWrknTrk

Re: Little Blue 82

Administrator

FuzzFace2 wrote

Copper tubing is better, it will not rust out and is easier to bend.

Poor man headers ... EFI manifolds
Dave ----

Dave, it's copper/nickle brake line.
Bends by hand and reverse flares without collapsing.

EFI manifolds with the Walker -non catalyst- Y pipe.
2 1/4 to the collectors and 2 1/2" out.

We did this on a CT members truck when he mounted my 465 Holley on an Offenhauser intake

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Little Blue 82

Administrator

In reply to this post by FuzzFace2

Sorry Dave, I forgot.

(My excuse is that I'm busily organizing the new website in the background. But I should have remembered that.)

Gary, AKA "Gary fellow": Profile

Ray Cecil

Re: Little Blue 82

What is the reason for pulling air out of the air horn, down through the copper, then back up to the choke? Why not just let the atmosphere in the copper tube? Its such a low volume of air, it'll never clog. Personally, I like minimalism under the hood.

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

Gary Lewis

Re: Little Blue 82

Administrator

Because whatever is in that air is going into the engine. If you drive in dusty conditions do you want that in your engine?

Gary, AKA "Gary fellow": Profile

Ray Cecil

Re: Little Blue 82

Gary Lewis wrote

Because whatever is in that air is going into the engine. If you drive in dusty conditions do you want that in your engine?

I put my finger on the end of that tube while the engine was running. I felt no vacuum. Id be surprised if that tube draws in 1 gallon of air an hour.

Am I supposed to have a measurable vacuum at that port? If its just a tiny immeasurable vacuum of air....no, I am not worried about filtering it.

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

Gary Lewis

Re: Little Blue 82

Administrator

I've never measured it. But unless it is plugged it draws air in through a very small, metered port. I don't want the dust from the road in my engine, so if the tube is off I seal the port.

Gary, AKA "Gary fellow": Profile

Ray Cecil

Re: Little Blue 82

Skiatook is much more dusty than Taylorsville KY. I am not concerned about it. If I was, I think I might use an inline filter, rather than running tubes all over the place.

Anyway, I drove little blue in to work today. I was anticipating the results of the new pieces of weather strip over the tops of the doors. They DO quiet things down noticeably. I still have a vent window whistle on the passenger door. My sliding rear window latch is broke, and the window works its way open slightly and causes another whistle. So I will be getting a new latch for that.

The choke comes tomorrow. I will get that setup then.

It was colder this morning. Tested out the new heater core, worked really well. No issues with defrost.

Now I need to address my exhaust and noisy tires.

I have two Flowmaster FX glasspacks behind an x-pipe. Then dumps before axle. Its loud. I have a 3"In/Out 40 Series flowmaster sitting here too. Center in/Center out. I am thinking the two 2.25" pipes into 1 3" pipe, into the 40 series, then back over the axle and out the back.

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

Gary Lewis

Re: Little Blue 82

Administrator

I'm not a fan of Flowmasters, and the 40 Series in particular. My other '81 had one on that 351M and it was terribly noisy. I put a longer Magnaflow on and it was much quieter. And then I could hear the tires sing.

Gary, AKA "Gary fellow": Profile

Ray Cecil

Re: Little Blue 82

I could always install the glasspacks in-line with the 40 series. I did that on a chevy van once, and it was a nice exhaust. I used a 3" in and 3" out Summit brand glasspack. But it wasn't a bullet style glasspack. Looked like a chambered muffler from the outside, but was straight through and glass packed. SS housing. You really couldn't hear it idle, but at higher rpm's you could just a little bit.

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

Ray Cecil

Re: Little Blue 82

Alright.....so. Got the choke in last night. It works. The old one was for sure BUSTED.

Anyway, I tried starting the truck this morning and had trouble. I think the choke plate was completely closed. I pulled the air cleaner off and sure enough, no gap in the plate.

So, if I read through everything correctly, with the engine stone cold, there should be a 1/8" gap in the choke plate, correct?

The new choke housing in slightly larger in OD, and has a HARD time turning on the carb. I may need to remove it and file the edges a hair. But, anyway, I think I can mess with it and get it tuned.

This morning was the coldest yet. The engine ran like crap all the way to work. Yesterday, I noticed a little pinging under heavy load. So I retarded the timing just a hair and the pinging disappeared. But, now I have an off-idle bog, once the rpm's come up it lights-up and pulls hard.

Maybe I need to get that choke dialed in first. Then re-set base timing and keep tuning.......Fuel Injection is looking more and more attractive the colder it gets....

1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker

1986 F150 302, C6, 9" 2.75, Wood Flatbed

Gary Lewis

Re: Little Blue 82

Administrator

The way I read the instructions the 1/8" measurement is for the choke unloader, which is when you open the throttle fully. But I can't find a definitive measurement for the cold choke setting.

However, I did find a very informative thread on the topic by our very own David/1986F150Six. In it he appears to say that for his truck backing off the setting by two notches from fully closed worked.

However, what we don't know is how far "closed" the choke housing was. In other words, he said there was strong spring pressure holding the choke closed, so had the housing actually been rotated a notch or two past where the choke plate first fully closed? But he did say that the choke plate opened "very slightly".

So I'd adjust the choke so that the plate was open 1/32" or something like that and try it. And, bear in mind that each engine/carb combo is slightly different, so the "book" setting is just a good starting point. You tune from there.

Gary, AKA "Gary fellow": Profile

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