LS3 Port Identification - Team Camaro Tech
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post #1 of 28 (permalink) Old Jul 24th, 19, 04:46 AM Thread Starter
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LS3 Port Identification

Can someone insure that I know what this port is used for, what gets connected to it?



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post #2 of 28 (permalink) Old Jul 24th, 19, 04:52 AM
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Re: LS3 Port Identification

Crankcase ventilation. Connect it to your air intake tube between the MAF and throttle body. It must go after the MAF so the air is metered.

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post #3 of 28 (permalink) Old Jul 24th, 19, 05:25 AM
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Re: LS3 Port Identification

Quote:
Originally Posted by dhutton View Post
Crankcase ventilation. Connect it to your air intake tube between the MAF and throttle body. It must go after the MAF so the air is metered.
If it goes after the MAF it isnít metered.

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post #4 of 28 (permalink) Old Jul 24th, 19, 05:37 AM
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Re: LS3 Port Identification

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Originally Posted by Vega$69 View Post
If it goes after the MAF it isnít metered.
After as defined by the airflow direction. So after the intake air flows through the MAF. Therefore it is metered by the MAF. My statement was correct John. This isnít my first rodeo....

I encourage the OP to read and fully understand the documentation he received with his GMPP LS3 crate engine and harness etc...

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post #5 of 28 (permalink) Old Jul 24th, 19, 06:50 AM
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Re: LS3 Port Identification

Don. Help me understand.

If air is introduced after the MAF how can it be metered by the MAF?
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post #6 of 28 (permalink) Old Jul 24th, 19, 07:00 AM
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Re: LS3 Port Identification

Quote:
Originally Posted by dhutton View Post
After as defined by the airflow direction. So after the intake air flows through the MAF. Therefore it is metered by the MAF. My statement was correct John. This isnít my first rodeo....



I encourage the OP to read and fully understand the documentation he received with his GMPP LS3 crate engine and harness etc...



Don
Correct.

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post #7 of 28 (permalink) Old Jul 24th, 19, 07:19 AM
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Re: LS3 Port Identification

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Originally Posted by Vega$69 View Post
Don. Help me understand.

If air is introduced after the MAF how can it be metered by the MAF?
John, that is where the fresh air flows from the intake tube to the crankcase. You have the air flow direction reversed in your mind.

At least this has long been my understanding. I guess I better not be wrong....

Don

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post #8 of 28 (permalink) Old Jul 24th, 19, 08:21 AM Thread Starter
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Re: LS3 Port Identification

Quote:
Originally Posted by dhutton View Post
Crankcase ventilation. Connect it to your air intake tube between the MAF and throttle body. It must go after the MAF so the air is metered.
Thanks, I believe I have a nipple to accommodate the connection.



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post #9 of 28 (permalink) Old Jul 24th, 19, 08:23 AM
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Re: LS3 Port Identification

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Originally Posted by Sixty8Camaro View Post
Thanks, I believe I have a nipple to accommodate the connection.



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Yep. What intake kit is that? Looks pretty good.

Don

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post #10 of 28 (permalink) Old Jul 24th, 19, 08:24 AM
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Re: LS3 Port Identification

So if the port on the valve cover takes fresh air from the intake tube after the MAF the volume of air entering the TB is not the same volume the MAF measured.

Maybe this is offset by the air from the port on the valley cover the is connected to the vacuum side of the TB.

Just curious and wondering?

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post #11 of 28 (permalink) Old Jul 24th, 19, 08:59 AM Thread Starter
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Re: LS3 Port Identification

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Originally Posted by dhutton View Post
Yep. What intake kit is that? Looks pretty good.

Don
I guess it is from Chevrolet Performance? I think more expensive @ $475 than some other options?

https://www.gmperformancemotor.com/P..._Code=19301246


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post #12 of 28 (permalink) Old Jul 24th, 19, 09:02 AM
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Re: LS3 Port Identification

Quote:
Originally Posted by Vega$69 View Post
So if the port on the valve cover takes fresh air from the intake tube after the MAF the volume of air entering the TB is not the same volume the MAF measured.



Maybe this is offset by the air from the port on the valley cover the is connected to the vacuum side of the TB.



Just curious and wondering?
It is measured as the air is then sucked down the intake and burned. The air is still used and burned just not ran through the " throttle body " per say.
The air is pulled past the maf ( metered) and then burnt. Air pulled in front of maf is still burnt but not metered
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post #13 of 28 (permalink) Old Jul 24th, 19, 09:20 AM
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Re: LS3 Port Identification

Quote:
Originally Posted by Vega$69 View Post
So if the port on the valve cover takes fresh air from the intake tube after the MAF the volume of air entering the TB is not the same volume the MAF measured.

Maybe this is offset by the air from the port on the valley cover the is connected to the vacuum side of the TB.

Just curious and wondering?
It passes through the MAF then to the valve cover then through the crankcase and finally into the intake through that corrugated tube. No air is lost anywhere in the process. It is just ďdirtyĒ when burned. The vacuum in the intake pulls the air from the intake through the crankcase etc. That is the purpose of the catch can, to capture any oil in that dirty air before it reaches the intake.

Don

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post #14 of 28 (permalink) Old Jul 24th, 19, 09:24 AM
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Re: LS3 Port Identification

Quote:
Originally Posted by dhutton View Post
It passes through the MAF then to the valve cover then through the crankcase and finally into the intake through that corrugated tube. No air is lost anywhere in the process. It is just ďdirtyĒ when burned. The vacuum in the intake pulls the air from the intake through the crankcase etc. That is the purpose of the catch can, to capture any oil in that dirty air before it reaches the intake.



Don
Thanks lol your explanation sounds better then mine.. first time I went to hook up I had to think about for a while. To be correct as you said, tap in after maf sensor.

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post #15 of 28 (permalink) Old Jul 24th, 19, 12:42 PM
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Re: LS3 Port Identification

Conclusion.

Functionally it will work the same before or after the MAF. The amount of air is so small that not being measured by the MAF doesnít affect anything.

However, Since there is no check valve the correct install location after the MAF is so the MAF does not contaminated from crankcase oil from the port on the valve cover

Sorry sometime I overthink things, says my wife, so in addition accepting the location question I am curious about why.
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