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post #1 of 18 (permalink) Old Jul 30th, 09, 08:55 PM Thread Starter
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uncorked headers now it pops

hi guys.im going to try bracket racing tomorrow night and last time i ran i couldnt hear my car with the mufflers so this time i uncorked the headers.i can hear it now.when i rev it up to about 2500-3000 rpm and let off it pops thru the headers.i tried udjusting fuel are mixture both ways and it still does it.is it because of lack of back presure? i checked the timing its at 18 btdc with vacume addvance pluged.motor is a 350.mild cam,around 268-270.headers,torqer intake,holley 650dp.hei with accel coil.thx

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post #2 of 18 (permalink) Old Jul 30th, 09, 09:59 PM
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Re: uncorked headers now it pops

Might richen up the main jets a couple numbers.

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post #3 of 18 (permalink) Old Jul 31st, 09, 05:37 AM
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Re: uncorked headers now it pops

Might have a leak near the flanges to head? , upon decell , engine tries to pull in air into headers? Gaskets?

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post #4 of 18 (permalink) Old Jul 31st, 09, 06:18 AM Thread Starter
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Re: uncorked headers now it pops

thx guys il try it and check for leaks

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post #5 of 18 (permalink) Old Jul 31st, 09, 07:48 AM
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Re: uncorked headers now it pops

The popping has nothing to do with a gasket leak. The free flow of removing the mufflers is contributing to a lean air fuel ratio which will make the engine pop on deceleration.

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post #6 of 18 (permalink) Old Jul 31st, 09, 07:50 AM
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Re: uncorked headers now it pops

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Originally Posted by jmartorana View Post
The popping has nothing to do with a gasket leak. The free flow of removing the mufflers is contributing to a lean air fuel ratio which will make the engine pop on deceleration.
How does this happen?

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post #7 of 18 (permalink) Old Jul 31st, 09, 08:36 AM
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Re: uncorked headers now it pops

Depends on how it's popping back. Only on decceleration is normal.
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post #8 of 18 (permalink) Old Jul 31st, 09, 10:49 AM Thread Starter
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Re: uncorked headers now it pops

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Depends on how it's popping back. Only on decceleration is normal.
so its ok then?its only decceleration.i just ont like the sound.i had my head hanging kinda under car when i let off gas it poped and rung my ears lo

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post #9 of 18 (permalink) Old Jul 31st, 09, 12:25 PM
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Re: uncorked headers now it pops

I love the sound of uncorked headers... Can you shoot a vid of your ride..

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post #10 of 18 (permalink) Old Jul 31st, 09, 03:42 PM
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Re: uncorked headers now it pops

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How does this happen?
Less exhaust restriction = more air flow thru the engine = lean mixture

Jet up a couple of numbers, you'll make more hp and the pops with go away.

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post #11 of 18 (permalink) Old Jul 31st, 09, 04:43 PM
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Re: uncorked headers now it pops

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Less exhaust restriction = more air flow thru the engine = lean mixture

Jet up a couple of numbers, you'll make more hp and the pops with go away.
You mean the air just goes right through the carburetor without causing any extra vacuum to attract extra fuel? I find this to be very disturbing, because I don't any air sneaking through my carburetor without doing any work.
My next question would be, how does the carburetor know when to mix fuel with the air and when to just let air in?

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post #12 of 18 (permalink) Old Aug 2nd, 09, 10:00 AM Thread Starter
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Re: uncorked headers now it pops

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I love the sound of uncorked headers... Can you shoot a vid of your ride..
my daughter did shoot videos of the races.the car sounded good but i did loose low end power.i advanced the timing but didnt help.was poor air with thunder storms and smoke from fires.i had a blast racing .i won my dot street class.took 1st place and had a blast.my daughters camera wont load the pics on my puter for some reason?gonna try again later.il post some pics and videos.they had some pro mods running as well.man they are [email protected] and sideways.

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post #13 of 18 (permalink) Old Aug 2nd, 09, 07:09 PM
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Re: uncorked headers now it pops

If you lost low end power with open headers try this old trick. Bolt up about three feet of 2-4 inch pipe with a flange welded to it to the header flange. I use a yellow grease pencil, a welder's white marking stick will work. Make a line all the way along the length of the tube. Make several runs. Cut the pipe where there is a noticable difference in the line's appearance from heat.This should be the correct length for an extension and will help.Usually 18-24 inches.
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post #14 of 18 (permalink) Old Aug 2nd, 09, 07:38 PM
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Re: uncorked headers now it pops

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Originally Posted by Moonpie View Post
If you lost low end power with open headers try this old trick. Bolt up about three feet of 2-4 inch pipe with a flange welded to it to the header flange. I use a yellow grease pencil, a welder's white marking stick will work. Make a line all the way along the length of the tube. Make several runs. Cut the pipe where there is a noticable difference in the line's appearance from heat.This should be the correct length for an extension and will help.Usually 18-24 inches.
Excellent advice.

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post #15 of 18 (permalink) Old Aug 3rd, 09, 04:16 AM
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Re: uncorked headers now it pops

And by adding extensions, it improves low end torque.

The extensions should be of the same collector diameter. Optimum design would be 3" diameter inlet to the length needed with a 5" diameter outlet, a cone shape extension.

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