Why bypass TB? Why not just cap lines?
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 843
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From: Illinois, USA
Why bypass TB? Why not just cap lines?
I did the throttle body bypass today and I'm wondering why I even bothered bypassing it. Why not just remove the lines and cap the fittings? It would be a lot cleaner that way.
Safety Car
Joined: Jun 2000
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From: Long Island, NY
Re: Why bypass TB? Why not just cap lines? (Blown94vette)
You need to have the coolant flowing through the correct route.
If you capped the ends without tying them togeather, how will the coolant flow back into the radiator ?
The cooling system makes a big loop from the radiator to the engine and back into the radiator.
Vic
If you capped the ends without tying them togeather, how will the coolant flow back into the radiator ?
The cooling system makes a big loop from the radiator to the engine and back into the radiator.
Vic
Burning Brakes
Joined: Aug 2000
Posts: 1,075
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From: Brookhaven Pa
Re: Why bypass TB? Why not just cap lines? (Blown94vette)
Many people do just eliminate the hoses. You can get a '95 or '96 upper radiator hose, which does not have the cutout for the bypass it is all one hose and you can use a piece of tubing to eliminate the tee in the heater hose, will make it almost impossible to tell the hose was split.
Melting Slicks
Joined: Jun 2001
Posts: 2,525
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From: Sarasota, FL
Re: Why bypass TB? Why not just cap lines? (cnl3rd)
Sounds like those later cars are plumbed differently than ours Vic, I was gonna say the same thing.
[Modified by BobMachus, 7:30 PM 3/30/2002]
[Modified by BobMachus, 7:30 PM 3/30/2002]
Team Owner
Joined: Apr 2001
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From: Dallas TX
Re: Why bypass TB? Why not just cap lines? (BobMachus)
The 95 & 96 have a different cooling system setup. The reason for the bypass instead of the caps is because air bubbles are designed to rise to the highest part of the system. The TB is one of the highest spots in the system and by capping those, you will have bubbles collect inside your heads, the block, etc... instead of where you want them to, in a small tube.
That's my story and I'm stickin' to it :yesnod: :D
That's my story and I'm stickin' to it :yesnod: :D
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 843
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From: Illinois, USA
Re: Why bypass TB? Why not just cap lines? (DON M)
The heater bypass circuit that heats the car before the T-stat opens runs through that hose on the L-98. No connection = no heat.
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Safety Car
Joined: Jun 2000
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From: Long Island, NY
Re: Why bypass TB? Why not just cap lines? (BobMachus)
Sounds like those later cars are plumbed differently than ours Vic, I was gonna say the same thing.
Vic
Le Mans Master
Joined: Apr 2000
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From: Manassas VA
Re: Why bypass TB? Why not just cap lines? (Glock'94)
On my 93 the connections for the hoses that feed and return the coolant to the TB come off of tee's so by eliminating them you still have the coolant path. As far as what Glock said it makes sense, exspecially since the TB has a bleeder on it, but if this is true, then bypassing it will still eliminate the place to bleed it.
Melting Slicks
Joined: Oct 2000
Posts: 2,726
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From: Freehold, NJ
Re: Why bypass TB? Why not just cap lines? (Blown94vette)
Glock is right. The reverse flow cooling system is very susceptibile to aeration. The lines at the back of the head are designed to eliminate the air pockets. That's you must "bypass" the throttle body. If you cap it off, then there is no way to get rid of the air bubbles.
Melting Slicks
Joined: Jan 2000
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From: NW Chicago Suburbs
Re: Why bypass TB? Why not just cap lines? (Eric Fischer)
Justto add to this, if you look, the steam tube (that comes from the back of the motor) is actually connected to each of the heads. The steam is collected, routed through the TB and back into the system.
Eric
Eric
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From: Dallas TX
Re: Why bypass TB? Why not just cap lines? (JasonL)
The cooling system is under ~15 psi right? Wouldn't a cap just pop right off?
Burning Brakes
Joined: Sep 2001
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From: Jupiter Florida
Re: Why bypass TB? Why not just cap lines? (Blown94vette)
You could probably file this under cockamamie hairbrained schemes, but has anyone ever tried re-plumbing it to preheat the fuel to increase volatility? I remember hearing the cold air/warm fuel discussion awhile ago, haven't heard much since. Snake oil?