Dad's Truck Build
#1396
I cleaned the heads up so there aren't any hot spots. But, I'm running 14 BTDC initial lead - at least I think I am. Got to thinking about that on the drive today and decided I'd better check to make sure.
But it isn't running that lean. According to the AFR meter I'm running 14-15:1 most of the time, but there are long periods where all the LED's go out, which puts it above 15. Bill said they used to tune for 16:1 for economy, and I don't think I'm quite that far.
That brings me to a question for y'all: I'm thinking a thread about tuning an Edelbrock might be helpful. I could include what I've learned about and from the AFR, and there's a lot to be learned there. Maybe we could get some of the real pros to contribute, and it might help the guys that are afraid of them or are just throwing jets and/or rods at them. Thoughts?
But it isn't running that lean. According to the AFR meter I'm running 14-15:1 most of the time, but there are long periods where all the LED's go out, which puts it above 15. Bill said they used to tune for 16:1 for economy, and I don't think I'm quite that far.
That brings me to a question for y'all: I'm thinking a thread about tuning an Edelbrock might be helpful. I could include what I've learned about and from the AFR, and there's a lot to be learned there. Maybe we could get some of the real pros to contribute, and it might help the guys that are afraid of them or are just throwing jets and/or rods at them. Thoughts?
What he said !
#1397
Dad's Truck Build.
Gary, here is what I have in harnesses from 89 and 90 trucks (these fit the switches and panels). First picture is right side, second is left. I couldn't find the cross cowl harness, it may be somewhere else.
While I was taking these, I dropped the little Pentax and cracked the LCD display screen. Since it doesn't have a viewfinder, it is going to be a pain to use, all the functions display on the LCD.
While I was taking these, I dropped the little Pentax and cracked the LCD display screen. Since it doesn't have a viewfinder, it is going to be a pain to use, all the functions display on the LCD.
#1398
Gary, here is what I have in harnesses from 89 and 90 trucks (these fit the switches and panels). First picture is right side, second is left. I couldn't find the cross cowl harness, it may be somewhere else.
While I was taking these, I dropped the little Pentax and cracked the LCD display screen. Since it doesn't have a viewfinder, it is going to be a pain to use, all the functions display on the LCD.
While I was taking these, I dropped the little Pentax and cracked the LCD display screen. Since it doesn't have a viewfinder, it is going to be a pain to use, all the functions display on the LCD.
Second, I think I could use the wiring as well as the switches. And, I may have the cross-cowl harness for an 85 - would it work?
Last, two of the guys have asked for a how-to on tuning an Edelbrock, although they seem to want a basic carb tutorial as well. Anyway, you are way beyond me on carbs, so would you be willing to proofread, upgrade, correct things I put together?
#1399
I am going to ask Pentax if it can be repaired. The cross cowl harness may work, plugs might be different, but they can be changed. On the Edelbrock/Carter, yes I will proofread and help with it.
I will put all the wiring pieces together for you and send it along with the grille emblem Bruno wanted.
I will put all the wiring pieces together for you and send it along with the grille emblem Bruno wanted.
#1400
I am going to ask Pentax if it can be repaired. The cross cowl harness may work, plugs might be different, but they can be changed. On the Edelbrock/Carter, yes I will proofread and help with it.
I will put all the wiring pieces together for you and send it along with the grille emblem Bruno wanted.
I will put all the wiring pieces together for you and send it along with the grille emblem Bruno wanted.
On the carb stuff, I certainly appreciate your help. And, I'd appreciate the help of the rest of you pros out there - PLEASE!
On the cables and switches, thanks but I would at least like to pay the shipping and I'd like to pay more if you'll let me know what via PM. Again, thanks!
#1401
I am going to ask Pentax if it can be repaired. The cross cowl harness may work, plugs might be different, but they can be changed. On the Edelbrock/Carter, yes I will proofread and help with it.
I will put all the wiring pieces together for you and send it along with the grille emblem Bruno wanted.
I will put all the wiring pieces together for you and send it along with the grille emblem Bruno wanted.
#1402
Dad's Truck Build.
No, the one I got the parts off the grille, headlights etc. were gone, probably partially destroyed by the tree impact.
#1403
#1404
Is that what those harnesses plug into? In other words, what you have would plug into that harness?
#1405
#1406
#1407
#1409
Vacuum Gauge & Carb Jetting
I "read" the #5 plug today, as shown in the first picture. Basically it looks exactly like it did when I checked it after the 260 mile trip with stock jetting. Which is interesting since the last 260 miles was with jetting that is 7.1% leaner on cruise, which is where it was for 99% or more of the time. So, unless I should install new plugs before each test, things haven't changed enough to sway the plugs.
Given that, I would say the AFR meter is probably the better tool for jetting than the plugs since I certainly can see the difference on it. But, one tool I haven't had installed is a vacuum gauge, so I did that today. As you can see in the 2nd picture it is an oldie. And, it takes me back to the 70's as it was a permanent fixture on my '72 F250 Explorer w/a 390 & a Q-Jet. Anyway, this will let me know more about how the engine likes the mix since how much throttle has to be used to maintain a given speed shows up as vacuum. And, it shows me how close I am to bringing the metering rods up and enrichening the mix - which I can see on the AFR meter.
And, speaking of mix, as I've pointed out before Edelbrock doesn't have a combination of jet and rod between the stock 1406 ones and what they call #8 combination, which is the one I ran on the last trip and which is 7.1% leaner than the stock 1406 jetting. But, I have a Carter Strip Kit and there are 5 metering rod pairs in it and none of those are the same as the 7 in the Edelbrock kit for the 1406. (There are also several additional jet sizes in the Carter kit that aren't in the Edelbrock kit, but they are all either larger or smaller than the 3 jets in the Edelbrock kit, so I don't think they are options.) So, I plugged the sizes for those rods into my spread sheet and found one rod that I'm going to try on the next run, which is Thursday. This rod (.076 x .055") with the original jet (.098") will be 3.8% leaner on cruise, which is just about half-way between the stock jetting and the setup I just tried, which is a bit too lean. However, the power portion of the rod will be 11% leaner than the stock jetting's power range, so that may be an issue. But, one thing at a time - I want to get the cruise AFR right and then move to the power stage.
Given that, I would say the AFR meter is probably the better tool for jetting than the plugs since I certainly can see the difference on it. But, one tool I haven't had installed is a vacuum gauge, so I did that today. As you can see in the 2nd picture it is an oldie. And, it takes me back to the 70's as it was a permanent fixture on my '72 F250 Explorer w/a 390 & a Q-Jet. Anyway, this will let me know more about how the engine likes the mix since how much throttle has to be used to maintain a given speed shows up as vacuum. And, it shows me how close I am to bringing the metering rods up and enrichening the mix - which I can see on the AFR meter.
And, speaking of mix, as I've pointed out before Edelbrock doesn't have a combination of jet and rod between the stock 1406 ones and what they call #8 combination, which is the one I ran on the last trip and which is 7.1% leaner than the stock 1406 jetting. But, I have a Carter Strip Kit and there are 5 metering rod pairs in it and none of those are the same as the 7 in the Edelbrock kit for the 1406. (There are also several additional jet sizes in the Carter kit that aren't in the Edelbrock kit, but they are all either larger or smaller than the 3 jets in the Edelbrock kit, so I don't think they are options.) So, I plugged the sizes for those rods into my spread sheet and found one rod that I'm going to try on the next run, which is Thursday. This rod (.076 x .055") with the original jet (.098") will be 3.8% leaner on cruise, which is just about half-way between the stock jetting and the setup I just tried, which is a bit too lean. However, the power portion of the rod will be 11% leaner than the stock jetting's power range, so that may be an issue. But, one thing at a time - I want to get the cruise AFR right and then move to the power stage.
#1410
I "read" the #5 plug today, as shown in the first picture. Basically it looks exactly like it did when I checked it after the 260 mile trip with stock jetting. Which is interesting since the last 260 miles was with jetting that is 7.1% leaner on cruise, which is where it was for 99% or more of the time. So, unless I should install new plugs before each test, things haven't changed enough to sway the plugs.
Given that, I would say the AFR meter is probably the better tool for jetting than the plugs since I certainly can see the difference on it. But, one tool I haven't had installed is a vacuum gauge, so I did that today. As you can see in the 2nd picture it is an oldie. And, it takes me back to the 70's as it was a permanent fixture on my '72 F250 Explorer w/a 390 & a Q-Jet. Anyway, this will let me know more about how the engine likes the mix since how much throttle has to be used to maintain a given speed shows up as vacuum. And, it shows me how close I am to bringing the metering rods up and enrichening the mix - which I can see on the AFR meter.
And, speaking of mix, as I've pointed out before Edelbrock doesn't have a combination of jet and rod between the stock 1406 ones and what they call #8 combination, which is the one I ran on the last trip and which is 7.1% leaner than the stock 1406 jetting. But, I have a Carter Strip Kit and there are 5 metering rod pairs in it and none of those are the same as the 7 in the Edelbrock kit for the 1406. (There are also several additional jet sizes in the Carter kit that aren't in the Edelbrock kit, but they are all either larger or smaller than the 3 jets in the Edelbrock kit, so I don't think they are options.) So, I plugged the sizes for those rods into my spread sheet and found one rod that I'm going to try on the next run, which is Thursday. This rod (.076 x .055") with the original jet (.098") will be 3.8% leaner on cruise, which is just about half-way between the stock jetting and the setup I just tried, which is a bit too lean. However, the power portion of the rod will be 11% leaner than the stock jetting's power range, so that may be an issue. But, one thing at a time - I want to get the cruise AFR right and then move to the power stage.
Given that, I would say the AFR meter is probably the better tool for jetting than the plugs since I certainly can see the difference on it. But, one tool I haven't had installed is a vacuum gauge, so I did that today. As you can see in the 2nd picture it is an oldie. And, it takes me back to the 70's as it was a permanent fixture on my '72 F250 Explorer w/a 390 & a Q-Jet. Anyway, this will let me know more about how the engine likes the mix since how much throttle has to be used to maintain a given speed shows up as vacuum. And, it shows me how close I am to bringing the metering rods up and enrichening the mix - which I can see on the AFR meter.
And, speaking of mix, as I've pointed out before Edelbrock doesn't have a combination of jet and rod between the stock 1406 ones and what they call #8 combination, which is the one I ran on the last trip and which is 7.1% leaner than the stock 1406 jetting. But, I have a Carter Strip Kit and there are 5 metering rod pairs in it and none of those are the same as the 7 in the Edelbrock kit for the 1406. (There are also several additional jet sizes in the Carter kit that aren't in the Edelbrock kit, but they are all either larger or smaller than the 3 jets in the Edelbrock kit, so I don't think they are options.) So, I plugged the sizes for those rods into my spread sheet and found one rod that I'm going to try on the next run, which is Thursday. This rod (.076 x .055") with the original jet (.098") will be 3.8% leaner on cruise, which is just about half-way between the stock jetting and the setup I just tried, which is a bit too lean. However, the power portion of the rod will be 11% leaner than the stock jetting's power range, so that may be an issue. But, one thing at a time - I want to get the cruise AFR right and then move to the power stage.
I had a vacuum gauge like that on my 57 chevy back in the 70's..
It did help with the fuel mileage IF you kept your foot out of the Carter 625 competition series carb..
I wonder if all the 1406 carbs come with the same stock jetting..
Mine is an old one(bought in 95)..still has webber stamped..Trav..
Last edited by truckertrav; 11-06-2012 at 07:06 PM. Reason: spelling