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Re: Carb tuners [Re: Thumperdart] #1959712
11/29/15 02:36 PM
11/29/15 02:36 PM
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Crizila Offline
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Originally Posted By Thumperdart
Originally Posted By Crizila
Critique this if you will. drop box


Critique what?
Click on "drop box".


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Re: Carb tuners [Re: Crizila] #1959722
11/29/15 02:54 PM
11/29/15 02:54 PM
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State of confusion
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72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: Carb tuners [Re: Thumperdart] #1959730
11/29/15 03:05 PM
11/29/15 03:05 PM
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Crizila Offline
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Originally Posted By Thumperdart
Cant get in
Hmmm? http://www.dropbox.com/home?preview=FILE0027.MOV


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Re: Carb tuners [Re: Crizila] #1959741
11/29/15 03:37 PM
11/29/15 03:37 PM
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Takes you to a join or login page.



"Just a Bracket car dressed up like a streetcar"
Re: Carb tuners [Re: Just-a-dart] #1959744
11/29/15 03:40 PM
11/29/15 03:40 PM
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Strange?? When I click on it it takes me right to the video? Maybe because I am already logged in the "drop box"?

Last edited by Crizila; 11/29/15 03:43 PM.

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Re: Carb tuners [Re: Crizila] #1959849
11/29/15 07:17 PM
11/29/15 07:17 PM
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Re: Carb tuners [Re: hemi-itis] #1959887
11/29/15 08:28 PM
11/29/15 08:28 PM
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Re: Carb tuners [Re: Crizila] #1960026
11/30/15 12:29 AM
11/30/15 12:29 AM
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Was concerned about the lean readings at first but looked good afterwards although I'm not sure what your afr's should be boosted..........


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: Carb tuners [Re: Thumperdart] #1960074
11/30/15 01:53 AM
11/30/15 01:53 AM
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Crizila Offline
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Originally Posted By Thumperdart
Was concerned about the lean readings at first but looked good afterwards although I'm not sure what your afr's should be boosted..........
Motor likes between 11 and 12:1. My problem is that it has a tendency to go lean just before the end. Motor is not happy at 13:1 and leaner. I can actually feel it lay down a little just before the line. If I jet up, it is too rich every else. Also have a major lean spot between 1200 and about 2000 rpm ( lean readings you saw ). I'm sneaking up on that area with smaller hi speed air bleeds ( hoping not to make it too rich everywhere else). I usually launch at around 2200rpm. 3500 stall convertor. Wish I knew what I was doing. wave


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Re: Carb tuners [Re: fast68plymouth] #1960080
11/30/15 02:18 AM
11/30/15 02:18 AM
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[quote=fast68plymouth]Holley offers jets up to #110.
I'd keep jetting before swapping air bleeds.

My experience has been that the air bleed is used more when you're looking to change the shape of the fuel curve( or when the jetting is grossly off, which often means its really the wrong carb).

It's in the high 12's spiking into the 13s wot. So,,,which is better,smaller HSB or larger jet??


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Re: Carb tuners [Re: B G Racing] #1960084
11/30/15 02:26 AM
11/30/15 02:26 AM
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Originally Posted By B G Racing
Jet until you get fat then back up jet where you feel you get the best performance,then change air bleeds to fine tune what ever circuit need attention.


The SV1 has a High speed & idle air only. I'm tryin to get a grip on when to make a jet change VS air bleed change.

Pro systems told me to go from .028 to .025 with the HSAB which would be about 3 main jet numbers.

Guess I'll always be a tuner fish,,,,,,,,,, work


HEMI-ITIS has no cure.
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Re: Carb tuners [Re: Dragula] #1960087
11/30/15 02:34 AM
11/30/15 02:34 AM
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Originally Posted By Dragula
I am by no means a carb tuner, but I will almost always change the bleeds first. One, they are easier, and two I generally like to keep jets in a certain range.

You have the SV1's on there, correct? Well, then throw away everything you know, and give the engine what it wants. And throw away the PS targeted range he prints on his carb sheet as well. Mine is pretty close now, and I am way different than what is on the sheet. I think my air bleeds are off by almost 15 sizes from what it came to me with. Best idling carb and best stable AFR at cruise I have had. My transition is still rich though. I will have to sort port 5 out some more.


Starts at the hit of the key,idle was fat so I leaned the idle air bleed and now it's good till I go WOT then it's on the lean side.Plugs come out white with no salt & pepper,heat range looks good. Shutting off at the stripe and looking at plugs also. I figure after dialing it in,I can start skipping the plug read.I always have 5 or 6 plugs on the floor behind my seat,take 4 plugs out to read and throw 4 crappers in for the ride back.


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Re: Carb tuners [Re: 3404] #1960088
11/30/15 02:36 AM
11/30/15 02:36 AM
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Great Neck,LI,new york
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Originally Posted By 3404
Do not overlook fuel pressure and float heights as well. You may be surprised what another pound or so of fuel pressure will change.


I will check that out,I do have the float level on the low side.


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Re: Carb tuners [Re: hemi-itis] #1960193
11/30/15 01:00 PM
11/30/15 01:00 PM
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Originally Posted By hemi-itis
Originally Posted By B G Racing
Jet until you get fat then back up jet where you feel you get the best performance,then change air bleeds to fine tune what ever circuit need attention.


The SV1 has a High speed & idle air only. I'm tryin to get a grip on when to make a jet change VS air bleed change.

Pro systems told me to go from .028 to .025 with the HSAB which would be about 3 main jet numbers.

Guess I'll always be a tuner fish,,,,,,,,,, work
Interesting and good info up. The build sheet from pro-systems on my carb (950AN main body) gave me a range on high air and idle air ( high was 33-24 lean-rich and idle was 93-70 ). Think that run was with high = 24 and idle = 70 - both on the max rich side per their build sheet. No range given for the main jetting, so I assume they just want me to fine adjust with the air bleeds shruggy. I know we have vastly different set ups, but curious how your build sheet for your carbs reads and if 3 HSAB size change equates to 3 main jet size changes in all cases. Don't mean to hi-jack your post. Trying to learn also. beer


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Re: Carb tuners [Re: hemi-itis] #1960339
11/30/15 06:04 PM
11/30/15 06:04 PM
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The thing to understand most manufactures will give you a range to work with and Holley tell leave it where it is OTB.The truth be told this is good advice but Holley and most manufactures don't know your combo and the condition of your engine and your as run or as raced track,weather and all the other conditions that cause changes like altitude and air density.This makes your jetting and adjustments unique to your conditions and your combo.I find many that disagree with my methods but it usually works for me,if I become to confused with carburation calibration I can alway swallow my pride and ask AJ Casini. whistling bow up

Last edited by B G Racing; 12/04/15 11:40 AM.
Re: Carb tuners [Re: hemi-itis] #1960885
12/01/15 01:36 PM
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It's been a long learning curve for me as I can't get to the track as often as I would like.Installed new wires,distributor & coil to finally figure out the Holley Pro Strip Annialator was bad after 15 years of service.After I installed a 6al-2 at Bill Atwoods rec,the car ran better than it EVER did with the blower motor.


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Re: Carb tuners [Re: Crizila] #1962349
12/03/15 01:06 PM
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Somebody on this post mentioned changing emulsion tube jetting ( top jet to smaller size )to fix my off idle lean spot. Can't find that thread?


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Re: Carb tuners [Re: Crizila] #1962711
12/03/15 10:35 PM
12/03/15 10:35 PM
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Originally Posted By Crizila
Somebody on this post mentioned changing emulsion tube jetting ( top jet to smaller size )to fix my off idle lean spot. Can't find that thread?


I had posted suggested bringing the top emulsion hole down in size. But I deleted it thinking that the post had turned more to tuning the SV-1.

Any emulsion holes ABOVE the fuel level in the bowls will affect the transition from the idle circuit to the mains. Assuming that the mains are not coming in too late, then I would try putting in a .010" to .015" wire in the top emulsion holes and see how it likes it.

You could also try sizing down the next lower emulsion hole if the engine likes the top hole restricted.

I know that Thumperdart doesn't like the wire test. But it is quick, easy, and effective. And they can't go anywhere so they are a safe test.

Another thing to check is the feed hole for the transition slot. Make sure it is large enough. But I see more issues with too large of a the top emulsion hole than I do with undersized transition slot feed holes.


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Re: Carb tuners [Re: DaveRS23] #1962877
12/04/15 02:22 AM
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Originally Posted By DaveRS23
Originally Posted By Crizila
Somebody on this post mentioned changing emulsion tube jetting ( top jet to smaller size )to fix my off idle lean spot. Can't find that thread?


I had posted suggested bringing the top emulsion hole down in size. But I deleted it thinking that the post had turned more to tuning the SV-1.

Any emulsion holes ABOVE the fuel level in the bowls will affect the transition from the idle circuit to the mains. Assuming that the mains are not coming in too late, then I would try putting in a .010" to .015" wire in the top emulsion holes and see how it likes it.

You could also try sizing down the next lower emulsion hole if the engine likes the top hole restricted.

I know that Thumperdart doesn't like the wire test. But it is quick, easy, and effective. And they can't go anywhere so they are a safe test.

Another thing to check is the feed hole for the transition slot. Make sure it is large enough. But I see more issues with too large of a the top emulsion hole than I do with undersized transition slot feed holes.

Thank you Dave. Gonna give that a shot.


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Re: Carb tuners [Re: Crizila] #1962996
12/04/15 11:33 AM
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Keep us posted.


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