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06-06-2007, 05:41 PM
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CC Member
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Join Date: May 2006
Location: Hudson,
WI
Cobra Make, Engine: Classic Roadsters II
Posts: 152
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Not Ranked
Heater hose
I was wondering if it is necessary to run the hose from the manifold to the water pump bypassing the thermostat, or can those ports be plugged? I'm not going to run a heater.
Thanks guys.
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"COBRA" Big kids gokart 
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06-06-2007, 07:14 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Claremore,
OK
Cobra Make, Engine: RUCC, 289 c.i. with a T-5 "Living the Cobra Experience"
Posts: 994
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Good question, I'm not running a heater either & was told that I should run a hose from the manifold to the water pump. I didn't get around to doing it yet but like JAC would like to see what you guys say.
See ya in Tulsa,
Randy
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Juggernaut
"Living the Cobra Experience"
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06-06-2007, 08:41 PM
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CC Member
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Join Date: Feb 2007
Location: Austin,
TX
Cobra Make, Engine: Lonestar Classics, 302 stroked to 347; Metallic British Racing Green
Posts: 595
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Small block 302 stroked to a 347...I blocked all the heater hoses!
Glyn
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Cave magister imperitus - Beware the inexperienced teacher
"No, I DON'T have an accent, this is how English sounds when it is pronounced correctly!"
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06-06-2007, 09:25 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,434
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You need that bypass hose. Water is pushed through the block by the water pump. Then up the back, through the heads, and into the front of the intake manifold. If the hose is blocked, and the thermostat is closed, where would the water go? You're exactly right - nowhere. It just sits there and pressurizes the block and heads.
As the water around the heads gets hot, where can it go? Nowhere. The water is getting hot, but the thermostat remains closed because it's a long way from the heads.
The purpose of the bypass is to move the water in a complete circle with a closed thermostat: Pump --> block --> heads --> manifold ---> pump. Creates a nice gentle warming cycle, and eliminates hot spots.
Once the water in the closed circle starts getting too hot, the thermostat opens.
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06-07-2007, 07:02 PM
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CC Member
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Join Date: May 2006
Location: Hudson,
WI
Cobra Make, Engine: Classic Roadsters II
Posts: 152
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Thanks,
I also heard that you can drill a couple of holes in the thermostat to get a little flow, but I think I'll just make the loop.
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"COBRA" Big kids gokart
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06-07-2007, 09:10 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,434
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I always drill a 3/16" hole in the thermostat. Place the hole at 12 o'clock during the install. It's not a big enough hole to allow much flow. But it does make it an open loop, and air bleeds out really easy. I never have trouble burping the system. It pretty much burps itself.
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06-07-2007, 10:38 PM
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CC Member
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Join Date: Aug 2003
Location: San Diego,
CA
Cobra Make, Engine: BDR #455, KC427W, TWM-FI
Posts: 727
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Good info, I always wondered why that hose was needed.
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06-08-2007, 06:37 AM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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06-08-2007, 04:57 PM
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CC Member
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Join Date: May 2006
Location: Hudson,
WI
Cobra Make, Engine: Classic Roadsters II
Posts: 152
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thanks guys
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"COBRA" Big kids gokart
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08-27-2007, 07:25 PM
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CC Member
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Join Date: Aug 2007
Location: Southeast Ohio,
OH
Cobra Make, Engine: Shell Valley 302 cu in
Posts: 12
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Other inlet on water pump?
Roscoe,
My water pump on the Shell Valley 302 Cobra I just bought looks similar to your picture. When examining my water pump I discovered another inlet just below the top bypass. It had a hose clamp and a broken piece of hose on it. Was this capped somehow and broke off? I have no car heater.
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08-27-2007, 07:46 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Bill that is the one that would be attached from a heater core with another hose taking presurized coolant from the top of the intake manifold to the heater core too. Napa & Ford sell a small rubber cap or it can be internally threaded for 1/4" pipe and a tapered pipe plug used for a more secure fix.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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08-28-2007, 06:49 AM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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My Edelbrock pump has threaded ports. I blocked the lower one. As said, you can purchase rubber caps locally if yours are not threaded.
Roscoe
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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08-28-2007, 07:52 AM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Do you honestly think that automotive engineers are dumb and add unnecessary costs to a car or engine? There are valid reasons for a bypass hose as mentioned above. Its not nice to fool with mother Ford. Always use a bypass and a thermostat. It does not matter whether you have a heater or not. Also, the small hole in the thermostat mentioned above is always a good idea.
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Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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12-01-2007, 11:53 AM
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CC Member
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Join Date: Aug 2006
Location: Oxford Ct. and Englewood,Fl.,
CT
Cobra Make, Engine: Backdraft 351W Balanced/Blueprinted 360HP / Tremec 5 Speed
Posts: 93
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Not Ranked
JAC...Run the bypass hose as is shown in ROSCOE'S picture. It is available at NAPA.
My Cobra did not have it on the 351W engine when I got it. It had rubber block off caps installed. One day I was showing my car to a friend and as I brought up the RPM to about 4,000 we got a big suprise.
The cap blew it's end clean off and I had a huge anti-freeze mess all over the motor and engine compartment to clean up.
Believe me, run the bypass hose. Save yourself alot of grief. The engine is designed to have it and needs it....Gordon
Last edited by ox_ford_guy; 12-01-2007 at 01:46 PM..
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12-01-2007, 04:43 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,434
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Not Ranked
Quote:
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Originally Posted by JAC
I was wondering if it is necessary to run the hose from the manifold to the water pump bypassing the thermostat, or can those ports be plugged? I'm not going to run a heater.
Thanks guys.
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Yes, you need that. It keeps th coolant circulating through the block as the engine heats up. Otherwise, the water will just sit in the coolant passages of the head and get really hot before the thermostat opens. Also, when you're driving on a cool/cold day, it will keep the coolant stable throughout the water jacket.
If you're running a restrictor plate instead of a thermostat, then you can skip that hose. But that's recommended for race engines only. |
12-05-2007, 09:39 AM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Claremore,
OK
Cobra Make, Engine: RUCC, 289 c.i. with a T-5 "Living the Cobra Experience"
Posts: 994
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Not Ranked
Looks like I'll be running the bypass hose too. I'll also be pulling the thermostat out to drill that 3/16" hole in it. Better to do it now while there's no anti-freeze in the engine!
Thanks guys.
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Juggernaut
"Living the Cobra Experience"
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