How about this.. - Team Camaro Tech
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post #1 of 88 (permalink) Old May 13th, 15, 08:25 PM Thread Starter
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Tony
 
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How about this..

Let me start by saying I'm happy with my new carb (Quickfuel 680).

Installed yesterday and it didn't require much adjusting at all. It ran good in and out of gear. In park idle was set a hair high to account for it dropping in reverse. There was no air cleaner on it. Today I install the k&n air cleaner after getting the right height and it drops even more. The car wouldn't seem to idle smooth until I ran it about 5 min and drove it a few miles. I got home, shut it off and no run on.
So...does an air cleaner 1.25 drop base, 2.8 height element and Xtreme lid really affect idle like that? Also, should it take that long to warm up too a smooth idle? What adjustments can I make?
Yesterday it was making 17 on vacuum guage.

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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post #2 of 88 (permalink) Old May 13th, 15, 09:03 PM
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Joe
 
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Re: How about this..

It could be the "Xtreme lid". I recall reading these flow through lids actually create unwanted turbulence in the air as it is entering the carb.

The important thing here is that you ask me what kind of car I've got. "I've got a BITCHIN' CAMARO"
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'68 350 4 speed
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post #3 of 88 (permalink) Old May 13th, 15, 09:04 PM
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Re: How about this..

The air filter is a restriction. Make your adjustments with it in place. The 4" X 14" air filter on my car cost me 12HP on the dyno.

'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter
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post #4 of 88 (permalink) Old May 13th, 15, 09:12 PM Thread Starter
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Re: How about this..

Quote:
Originally Posted by kookykrispy View Post
It could be the "Xtreme lid". I recall reading these flow through lids actually create unwanted turbulence in the air as it is entering the carb.
Hmmm, I hadn't heard that before. I thought they were good for performance. I'll see if I can find a solid lid to test.

Would the restriction affect the air/fuel screws or can I just bump up the idle?

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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post #5 of 88 (permalink) Old May 13th, 15, 09:12 PM
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Re: How about this..

It's likely a touch rich without the air cleaner, and adding it made the condition worse. Lean out the 4 corner slightly. I have also heard the open element lid can cause problems.

Carbs can be finicky, but once you get comfortable with what they want they are easy to work with. Every change you make to air in, air out or timing effects the tune.

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

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post #6 of 88 (permalink) Old May 13th, 15, 10:37 PM Thread Starter
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Tony
 
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Re: How about this..

Ok makes sense. With the taller element I don't think I need that lid anyway. Ill just put the solid chrome lid on and make the adjustments. I had no idea air filters make a difference.

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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post #7 of 88 (permalink) Old May 13th, 15, 11:22 PM Thread Starter
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Tony
 
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Re: How about this..

Is 17 ok on vacuum with power brakes? I think vacuum lines are running differently since adding the performer rpm intake. If I recall correctly the vacuum advance, pcv and trans were connected to the carb. The booster was to the intake fitting. Since adding the Edelbrock, booster and trans run off a tee on intake. Vacuum advance and pcv to carb. Will this affect vacuum?

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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post #8 of 88 (permalink) Old May 14th, 15, 01:57 AM
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Re: How about this..

17 is fine for the brakes. I had 9 with my other cam that I replaced and I had no issues stopping. I know have 14.

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post #9 of 88 (permalink) Old May 14th, 15, 06:30 AM
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Re: How about this..

17 is more than enough vacuum.

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post #10 of 88 (permalink) Old May 14th, 15, 06:33 AM
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Re: How about this..

Do you have an electric choke ? If the car took 5 minutes to idle a little smoother you may have to adjust the choke for cold start-up.

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post #11 of 88 (permalink) Old May 14th, 15, 07:40 AM Thread Starter
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Tony
 
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Re: How about this..

Yes it has an elec choke. It was also suggested I lean out the 4 corners. Is leaning outward (counterclockwise) on the screws? Is that adding air or decreasing air? I assume adding. Not sure I'm clear on rich/lean. It ran great before adding that k&n element and extreme filter type lid. I'm for sure going to a regular 14 inch lid.

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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post #12 of 88 (permalink) Old May 14th, 15, 11:11 AM
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Re: How about this..

Quote:
Originally Posted by TClovis View Post
Yes it has an elec choke. It was also suggested I lean out the 4 corners. Is leaning outward (counterclockwise) on the screws? Is that adding air or decreasing air? I assume adding. Not sure I'm clear on rich/lean. It ran great before adding that k&n element and extreme filter type lid. I'm for sure going to a regular 14 inch lid.

Tightening the screws leans it out, loosening them richens the mixture. I have heard it described as being like a water faucet, unscrew is open the flow, tighten is close the flow (of fuel).

How many turns out are they now? If you do lean it out go about 1/8 of a turn to start, all 4 the same. Biggest thing is one change at a time, then test. You can get a perfectly good carb really screwed up with too many changes at once.

If it's an idle issue only, it probably can be resolved with the 4 corner.

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

Franklin D. Roosevelt
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post #13 of 88 (permalink) Old May 14th, 15, 11:44 AM Thread Starter
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Tony
 
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Re: How about this..

It seems to idle ok in park. It was mainly in reverse that it jumps and drops way down like it wants to shut off. The gen light even came on.

I'll try running no air cleaner first just to test. Then add the 2.8 k&n element and solid lid to test. If still doing it, I'll leave the filter on and try doing the lean adjustment.

It was fine with no filter when first installing the new Quickfuel carb. I had to order an element and needed to know how tall for clearance I borrowed my neighbor's Edelbrock air cleaner with a 3 inch paper filter and chrome led. Then I went for a test drive and it was right on the edge where if we dropped idle it would die and if we increased idle it was too high. Perfect was just a hair high.

Then I give my neighbor's unit back to install my new element and xtreme lid I guess pushed it over the edge.

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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post #14 of 88 (permalink) Old May 14th, 15, 01:13 PM
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Re: How about this..

One of my favorite carb reads;

http://members.tccoa.com/392bird/tuning.htm
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post #15 of 88 (permalink) Old May 14th, 15, 02:42 PM Thread Starter
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Tony
 
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Re: How about this..

Great read!

Where it talks about poor levels of adjustment and erratic idles...it mentions running vac advance directly to manifold vacuum.

My vacuum advance is running to the carb. I have a tee split between brake booster and auto trans. Should I switch where I have the trans and distributor vac advance? Does that matter with a mild cam or just stick to leaning the carb a bit?

1969 Camaro SS350, original motor/12 bolt/interior and build sheet in Fathom Green.
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