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Deuling's 1985 K5. "Restart thread on post #8415"

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You know what would fix all of this?


Fuel injection.




Sorry, had to.:D
 
Lol, this will do for now. I got the setup for $100, it comes with tuning software as well. Ill get her dialed in. It already busted the tires lose at the gas station like it was nothing by just gassing it. Never been able to do that before. :D
 
Not to beat a dead horse, but give it a few miles and then read a couple of the plugs again. You should start to see a change in the plugs from what it was. This may help for starting point for A/F mix.

Nice job on the getting it done part....
 
Had the same problem on my Holley, stab the gas pedal and it would fall on its face. It was due to a lean accelerator pump circuit. I solved it by increasing the accelerator pump size and also increasing the size of the nozzles. However that translates into Edelbrock tuning, I don't know.

Your initial timing can play into this also.
 
Deuling said:
Only issue is if you just step right on the pedal and dont ease in for a sec, it has a deadspot where it kinda pukes for half a second and then takes off. What causes this?
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Glad you like the timing, timing makes a critical difference in engine performance.

Sounds like an accelerator pump issue, needs more pump shot. Holleys have cams and squirters to adjust this, not sure about the Eddy carb. If there is any slop in the accelerator pump linkage(if it has one) at idle this is a bad thing.

And also, i doubt you will ever notice the difference in the lower energy of the premium fuel and it can prevent detonation when you have a hot engine at low RPM in low load with a lot of timing. If you don't need it, its a waste of money, but I doubt you will ever notice the power loss, its is extremely minimal. You could run more timing with premium fuel, but it may not make any more power if the engine doesn't need any more timing. I would say with the way you use your truck, you might be a little safer using the premium, especially after what just happened.
 
I quit dealing with Carbs many moons ago now but it sounds to me like the above is right. Too little fuel on the initial peddle stomp.

I know 4 strokes are a bit more open than a two stroke but I took the time to run my snowmobile so rich that it wouldn't run, then leaned it out to the point I was scared of ruining a piston. Then kind of split all that in the middle and let er rip.

Don't be afraid to try some things to see what the result is. You will learn a lot about tuning and also about what the symptoms of too much fuel and too little fuel are.
 
Agreed. And I think that innovative wide band will be good for you to see what's going on at all times. Doesn't mean you shouldn't still read the plugs from time to time.
 
I'm still rocking the Edelbrock too.
You already said it, you adjust the throttle plunger with the 3 holes on the front.

Another common mistake is putting 2 fuel screens in it with the spring loaded needle seats.
The rebuild instructions say use one or the other but not both. I installed both and was starved for fuel at the green light.
I took the one out at the intake and was good to go.
 
If I had what is possibly considered the least efficient small block head ever with no improvements made to tighten quench with a circle dish instead of the better d dish. Also knowing it has sledge hammer sharp tuning in a water heating station wagon engine seeing a high load condition for extended period of time with a previous detonation related failure, I would rather have the cushion than the possible 2 hp. But that is just me and what do I know? Adam I am pretty good with carbs you can keep messaging me.
 
80' 427 said:
If I had what is possibly considered the least efficient small block head ever with no improvements made to tighten quench with a circle dish instead of the better d dish. Also knowing it has sledge hammer sharp tuning in a water heating station wagon engine seeing a high load condition for extended period of time with a previous detonation related failure, I would rather have the cushion than the possible 2 hp. But that is just me and what do I know? Adam I am pretty good with carbs you can keep messaging me.
Click to expand...

I agree 100%, you said it better than I did. :waytogo:
 
That actually was from facebook today about running premium though his combination doesn't technically warrant it. I would prefer to err on the side of conservation to some degree.
 
Deuling said:
Sounds very plausible. Im not %100 positive the AF mixture gauge I have is accurate, but when this happens the gauge jumps to lean for a split second. Which would explain what you are saying.... Lots of air for a split second...
Click to expand...

Just so you don't get too paranoid...every engine has lean and rich instants during transients. You're usually just fine with it because you don't know. You can pretty much never get a wideband glued to stoich under transient conditions. So you get the steady state stuff to read right, then adjust transient stuff so that it runs OK and ignore the needle swings in those instants. It's hard enough with EFI with enrichments calculated from TPS and MAP changes, plus things like wall-wetting equations. Then with a carb you may have nothing to adjust but the pump shot, and even that in certain discrete steps. You're shooting for the least bad configuration.

Transients are like most of the real tuning of an engine, but even some commercial tuners don't do much with them. They rely on the factory PCM math and just tweak some of the cals. So even though the "tuner" has updated cals for engine mods, 95% of the real science was done by the OEM.
 
Had a bad night Saturday, so dad told me to go down to the shop to clear my head yesterday morning for a few hours.


Got the 800w marine amp mounted under the seat, just going to run a phone jack up from it to my ipod. Tucked up nice and tight, used some self tappers and then buzzed the extra off on the top side. Ran all the wiring, at some point id like to run the visible wires through the cage tube, but for now some zip ties will do. Sounds good, need to add some 6x9s for some bass. If I cant hear the drums, its no good.














 
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