looking for info on the net on holley truck avenger tuning etc.

[gingerbreadman]

Just put the 670 truck avenger on my pickup (77 f250 4x4 351m) the directions that came with it are chintsy, theres gotta be something better around. it doesnt even go into much detail on changing primary and secondary jets


-gbm-

 

[Dark Knight]

http://www.mortec.com/carbtip1.htm
http://www.shockley.net/holley-jets.asp
that work?

 

[D.Hearne]

What exactly do you need to know, GBM? Primary jets are fairly simple to change, but you have to remove the primary bowl to do so. If you're changing sizes, you need to go up or down by at least two sizes to see a difference. The secondary side is a different matter, if I'm not mistaken, the Avengers have a secondary metering plate, no jets there. You have to change the whole plate. But it's been my experience that, that's not necessary in 99% of cases.

 

[gingerbreadman]

What exactly do you need to know, GBM? Primary jets are fairly simple to change, but you have to remove the primary bowl to do so. If you're changing sizes, you need to go up or down by at least two sizes to see a difference. The secondary side is a different matter, if I'm not mistaken, the Avengers have a secondary metering plate, no jets there. You have to change the whole plate. But it's been my experience that, that's not necessary in 99% of cases.

well i just bolted the new carb on my pickup. I would just like to tune it. the chintsey intructions cover setting the floats, choke, high and low ideal etc. I got all that set.

But I know theres more to do. Its a 6000 pound daily driven 3/4 ton not a light to light drag racer so keep that in mind.

Im just looking for info on how to set it up for my application.



-gbm-

 

[84convertablegt]

if I'm not mistaken, the Avengers have a secondary metering plate, no jets there. You have to change the whole plate. But it's been my experience that, that's not necessary in 99% of cases.

Yes, you are correct, the truck avengers have a metering plate, not secondary jets and these carbs usually do not need any changes, just a simple set up tuning. the car street avenger on the other hand has primary and secondary jets, its like a 4150 carb.
holley tech support will help u out, just give them a call or search there website for information, there is alot to there site, u just have to dig around

 

[D.Hearne]

well i just bolted the new carb on my pickup. I would just like to tune it. the chintsey intructions cover setting the floats, choke, high and low ideal etc. I got all that set.

But I know theres more to do. Its a 6000 pound daily driven 3/4 ton not a light to light drag racer so keep that in mind.

Im just looking for info on how to set it up for my application.



-gbm-

If you've got everything else set, just take it out on the nearest freeway and run it at a steady speed ( uphill would be better in my opinion) for 5-10 miles, then stop somewhere where you're out of the way and pull a few spark plugs to see what they look like. If the mixture is close to right, they should look pretty much the way they did before you started out. If it's too rich they'll be nice and black. Too lean and they'll tend to be white-ish in color. I usually only check two plugs, one from each plane on a dual plane intake. On a single plane, I check one from the middle cylinders, and the other, one of the corner cylinders.

 

[gingerbreadman]

If you've got everything else set, just take it out on the nearest freeway and run it at a steady speed ( uphill would be better in my opinion) for 5-10 miles, then stop somewhere where you're out of the way and pull a few spark plugs to see what they look like. If the mixture is close to right, they should look pretty much the way they did before you started out. If it's too rich they'll be nice and black. Too lean and they'll tend to be white-ish in color. I usually only check two plugs, one from each plane on a dual plane intake. On a single plane, I check one from the middle cylinders, and the other, one of the corner cylinders.

I talked to holley, they said plugs change in seconds so no need to replace everytime you check.

heres what they say to do, go to a quarter mile, froma dead stop start driving and do a querter mile pass with staying off the secondaries, shut the engine down and coast to a stop. and check the plugs. this tells you the primary jets

then do another pass but this time give it all its got open the carb wide open. for a quarter mile and shut it down and coast to a stop and check the plugs , this tells ya the secondarie settings.

the big trick is to stay off the idel circuit thats why you shut it off while you still have your foot into it.

I did this and The plugs seem to have a slight whitish tint to them. im surprised being its supposedly set for seal level and im up at 1200 feet.


Should i richen the jets one up???

most of the driving I do i only go up in altitude.


Im on the phone with holley now


-gbm-

 

[D.Hearne]

If you change jets, go up two sizes, one size usually yeilds no change that you can see.

 

[gingerbreadman]

Well just got off the phone with holley.

the put me through to the "truck anvenger specialist" "ricky richter" he said the symtoms i have are concurrent to the truck avenger before they did the upgrades, each truck avenger is stamped 670-1 or 670-2 the -2 is sposed to be the new version which I have but he is confident this is the problem enough to warrenty me a new carb through the dealer i bought it from.

what a fricken pain in the ass.


-gbm-

 

[D.Hearne]

What was the problem they had caused by with the dash 1 carbs?

 

[gingerbreadman]

What was the problem they had caused by with the dash 1 carbs?

he didnt go into great detail about it. but he said the symptoms were acting like it. I'd say that since its there carb and there willing to warrenty it without even seing it they most likely know what there talking about.


-gbm-