Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
08-23-2018, 08:26 PM | #1 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Coolant bleed pipe question
Im finishing up my 4.8 swap and ran into an issue with these pipes. Under the throttle body are 2 small nipples for the coolant. One has a rubber hose going to the drivers side head and the other had a long hose going to I assume the radiator. The problem is I am using my stock SBC radiator and I don't know what to do with this other side. Can I simple put a rubber cap and clamp it shut? Anyone else run into this problem?
Thanks Jeff |
08-23-2018, 08:43 PM | #2 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
|
Re: Coolant bleed pipe question
It's like a preheater I think....I didn't hook it up...just stuck a vacuum cap on each side just to plug the holes..
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 08-23-2018 at 08:51 PM. |
08-23-2018, 09:38 PM | #3 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
You just made life a bit easier! Wasn't sure what to do. Thanks!
Got another problem with the drive belt being extremely hard to get on but I will try again this weekend and probably end up posting for help... |
08-23-2018, 10:33 PM | #4 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
|
Re: Coolant bleed pipe question
It is a steam port, it should be hooked to somewhere with constant flow in the cooling system. It helps with hot spots in the head by allowing any air or steam that accumulates under the increased heat of the heads a place to escape. It also allows the system to purge on the initial fill of coolant
I drilled and tapped a port into the back of my water pump that lines up with the upper radiator hose. This at least allows constant flow, and any air build up a path to the radiator where it can be burped off. |
08-23-2018, 10:47 PM | #5 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
|
Re: Coolant bleed pipe question
I think He's talking about capping the fittings on the throttle itself....not the engine steam ports...
Steams ports are important...I also plumbed mine into the water pump..... Belt shouldn't be a issue...make sure you have it routed correctly...a socket or wrench on the tensioner should do the trick...
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 08-23-2018 at 11:13 PM. |
08-24-2018, 12:04 AM | #6 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
|
Re: Coolant bleed pipe question
I agree, those specifically on the throttle body arent needed.
Last edited by sprint_9; 08-24-2018 at 10:34 AM. |
08-24-2018, 07:10 AM | #7 |
Registered User
Join Date: Apr 2010
Location: Guntersville Alabama
Posts: 1,073
|
Re: Coolant bleed pipe question
I read it as looking what to do with the long hose on the pass side tb long hose . Being the radiator was mentioned I would suspect it needs to be hooked up to the cooling system .
So yes , it needs to be hooked somewhere in the system as for reasons stated above . You can by pass the tb if you like and hook it directly to the drivers head to the cooling system . |
08-24-2018, 09:28 AM | #8 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
That picture is exactly what I'm talking about. The one on the drivers side is connected to the head and the pass side is open. If that is not needed I plan to just cap that off.
|
08-24-2018, 09:29 AM | #9 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
Mongo I will take pics of the belt problem when I get in this evening to show you what the problem is.
|
08-24-2018, 11:31 AM | #10 |
Registered User
Join Date: Jun 2015
Location: Indanapolis, IN
Posts: 603
|
Re: Coolant bleed pipe question
As was stated here you can cap the 2 ports on the throttle body. If you do this, you should NOT cap the line coming from the heads. So you still have to plumb that line back into your cooling system.
The line that feeds coolant into the throttle body comes from the steam ports in the heads. It should NOT be capped off. |
08-24-2018, 01:28 PM | #11 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
Ok I got you. Thanks Curt. Do you guys have any pics of your set up so I can get a better idea of how I should plumb mine?
Thanks |
08-24-2018, 01:56 PM | #12 |
Registered User
Join Date: May 2013
Location: Chicago, IL
Posts: 217
|
Re: Coolant bleed pipe question
TB coolant bypass is one of the earliest LS1 "free mods." Supposedly it's to warm the incoming air and keep the throttle body from icing up in cold conditions who knows. Easiest way to bypass is get a double barbed coupler and plug the hose together.
|
08-24-2018, 02:01 PM | #13 |
Registered User
Join Date: Dec 2017
Location: Niceville Florida
Posts: 347
|
Re: Coolant bleed pipe question
I am facing the same thing and pics would be great.
|
08-24-2018, 02:39 PM | #14 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
|
Re: Coolant bleed pipe question
i have mine plumbed like the yellow lines show...it goes under the tb and into the water pump in the raised boss of the pump....I had to later change water pumps and the new pump didn't have this boss area so I drilled and tapped npt in the same spot....pump housings are thin so be careful if you do it this way...there is also a heater hose fitting that can be used in your top radiator hose..
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 08-24-2018 at 02:44 PM. |
08-24-2018, 03:00 PM | #15 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
Would one of those radiator hose T connectors do the same thing? I read a thread on LS1tech and somebody said they did that.
|
08-24-2018, 03:35 PM | #16 |
Registered User
Join Date: May 2013
Location: Chicago, IL
Posts: 217
|
Re: Coolant bleed pipe question
Aren't the two lines running to the TB the steam lines? The driver's side going to nipple on front of D side head and the other can go to the in-line radiator hose fitting pictured above or to water pump or any other option out there. Some run 4 corner vents, some just to front of heads, and there's also spacer kits with steam barb to run fbody/car water pump.
|
08-24-2018, 03:41 PM | #17 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
|
Re: Coolant bleed pipe question
yes...hose t connector will do the same as tapping into waterpump...
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
08-24-2018, 04:12 PM | #18 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
Ok. Should I tap into the upper or lower radiator hose?
|
08-24-2018, 04:34 PM | #19 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
|
Re: Coolant bleed pipe question
upper
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
08-24-2018, 04:39 PM | #20 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
ok thanks again
|
08-24-2018, 07:06 PM | #21 |
Registered User
Join Date: Dec 2017
Location: Niceville Florida
Posts: 347
|
Re: Coolant bleed pipe question
mongocanfly
Where to purchase steam vent fitting? |
08-24-2018, 07:12 PM | #22 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
|
Re: Coolant bleed pipe question
Jags that Run has them. https://jagsthatrun.com/collections/co
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
08-24-2018, 08:31 PM | #23 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
|
Re: Coolant bleed pipe question
Ls1 nova ...I couldn't get your link to work...
Flexlite...................https://www.flex-a-lite.com/1-1-2-in...e-adapter.html And summit...................https://www.summitracing.com/parts/f...kaAiEeEALw_wcB JTR........https://shell7.tdl.com/~jags/Pages/P...g_LSI-tee.html Just google...(ls steam vent radiator hose)
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 08-24-2018 at 08:38 PM. |
08-24-2018, 10:28 PM | #24 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
|
Re: Coolant bleed pipe question
There are a few variables on water pump and steam port pipe routing. I cut the factory hose nipple off of my steam port piping, drilled it out to 11/32 to the right depth, and threaded it for 1/8 npt. From there I used an 1/8 npt to 1/4 barb 90.
This thread has some good pictures as well, one of my favorite engine builds. http://67-72chevytrucks.com/vboard/s...d.php?t=668385 |
08-27-2018, 08:29 AM | #25 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
|
Re: Coolant bleed pipe question
I couldn't find any specifics online to be exact but I measured the upper hose OD at 1 1/2 and I know LS are metric and that puts it at 38mm. Can anyone confirm or correct me on this? (Reason being I am going to plumb the bleed pipes into the upper hose)
Thanks |
Bookmarks |
|
|