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Author Topic: Ls steam lines  (Read 3800 times)

Offline rex388

Ls steam lines
« on: May 25, 2017, 10:07:22 PM »
Hey guys I was wondering if you guys are running just stock steam lines on your ls engines.

I was told that I should modify mine and I have a welded an fitting on them both and they run into my moroso coolant block. Only problem is I am battling coolant air locks. I tried to Jack the front of the car up so the moroso block was higher than the fitting. But I maxed out my jack with a 6x6 wooden block on it and I still can't get the block higher.

So I am thinking of just putting stock ones back on the engine to help out.
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Offline largeorangefont

Re: Ls steam lines
« Reply #1 on: May 26, 2017, 12:31:56 AM »
You need a tank with a radiator cap higher than the steam tubes to get the air out and the system will self burp.
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Offline rex388

Re: Ls steam lines
« Reply #2 on: May 26, 2017, 01:14:33 AM »
What kind do you have?

And could I just run stock lines and elevate the car so my ran cap is higher and fill it like that and fire up my water pump?
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Offline shainiac

Re: Ls steam lines
« Reply #3 on: May 26, 2017, 08:13:09 AM »
If you absolutely can't get the rad cap above the engine, you can try running an expansion tank like many OEM GM cars do. My friend has used OEM BMW expansion tanks on a few swaps and they work great. You tee into the heater core return hose and run the steam port vent to the top of the tank. It makes it 100x easier to bleed the system during first startup as well since you're adding coolant to the inlet side of the pump.
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'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
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Offline SH4DY

Re: Ls steam lines
« Reply #4 on: May 26, 2017, 09:31:38 AM »
I haven't had any issues with mine like this:


push-lock fittings. Tapped into the top of the water pump.
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Offline largeorangefont

Re: Ls steam lines
« Reply #5 on: May 26, 2017, 11:50:35 AM »


I have a Howe tank mounted to the driver side cylinder head. I run the can half full, steam vents are plumbed to the top of the  can, just below the cap. I run the cap vent to an external catch tank.

If your AN loops for the steam vents run high, I would just go back to a stock setup.
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Quote from: cool
Sell it to spacevomit.  He'll finish it.

Offline rex388

Re: Ls steam lines
« Reply #6 on: May 27, 2017, 11:33:14 PM »
Yeah I went out and ordered a Howe and I will either mount it to my motor plate or cylinder head.

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The only cure for drag racing is poverty

Offline Trinh

Re: Ls steam lines
« Reply #7 on: August 12, 2017, 01:30:39 PM »
are the steam vents on the valve covers on both cylinder head?? just trying to picture it. the left bank up front and the right bank is on the back?
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Offline spacevomit

Re: Ls steam lines
« Reply #8 on: August 12, 2017, 01:52:46 PM »
If there's a question as to the height of the fill point, I put a stepladder and run a vertical length of hose to fill through.

To burp it I will alternately add water, then open a connection somewhere else as a vent, opening and closing it and capping/uncapping the fill point to get the water to fill any voids. IDK if that makes sense but you'll see what I mean if you try it.
« Last Edit: August 12, 2017, 03:19:39 PM by spacevomit »
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Offline BlnLs1/rx7

Re: Ls steam lines
« Reply #9 on: August 12, 2017, 03:32:19 PM »
Quote from: SH4DY on May 26, 2017, 09:31:38 AM
I haven't had any issues with mine like this:


push-lock fittings. Tapped into the top of the water pump.

What alternator bracket are you using?
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