Re: Small block guys cooling. Question
[Re: larrymopar360]
#2721935
12/06/19 08:22 AM
12/06/19 08:22 AM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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If you are running a thermostat you need the bypass, if you are running an electric pump ditch the bypass and thermostat.
68 Barracuda Formula S 340
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Re: Small block guys cooling. Question
[Re: gzig5]
#2722116
12/06/19 08:12 PM
12/06/19 08:12 PM
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Joined: Jan 2011
Posts: 15,902 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,902
Central Florida
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I think if you get the bypass hose too small you can create back-pressure and cavitation in the pump, which will tear it up in short order. I also have Milodon HD pump with anti cavitation plate.
Facts are stubborn things.
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Re: Small block guys cooling. Question
[Re: burdar]
#2722140
12/06/19 09:37 PM
12/06/19 09:37 PM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,684
W. Kentucky
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The bypass allows the coolant in the engine to circulate while the thermostat is closed. The bypass lets the engine coolant heat up uniformly so no hot spots are created. Once the thermostat opens, it does bypass some water that could be going through the radiator and cooled. I've sometimes wondered how big the bypass really needs to be in order to work the way it was designed to. Could a restrictor be added that would maintain the bypass function yet allow more coolant to be cooled by the radiator? Has anyone done it? I found this out the hard way. When I built my 434 the Indy intake wasn't drilled for the bypass nipple. The engine would get hot quickly then the thermostat would open and it would cool off then repeat the process. I drilled and tapped the intake for the nipple then installed the bypass hose and it's been fine since.
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Re: Small block guys cooling. Question
[Re: 360view]
#2722307
12/07/19 02:14 PM
12/07/19 02:14 PM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
master
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master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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I have also used an old 1/2 drive 9/16 socket in my bypass hose on a few 318s and have not seen any ill effects.
I also always drill 2 each 1/16" hole in my thermostats, 180 degrees apart.
While more done for Circle Track racing, some of the mods are streetable and I have done some of the 'Sanborn' water restrictions on the two holes in the back of the block to keep the water from rushing into the head. This will require making sure the smaller holes in the block and the heads are aligned well and then opening up the gasket holes to match. This directs more water around the exhaust valves. I used 2 core plugs bit drilled a 1/16" air bleed hole in them so no trapped air.
The other mod I am going to try on my 410 stroke 5.9 is the timing covers water ports tapped for a 7/16 or 1/2 inch AN line ran over to the center of the blocks core/freeze plug.
The other cooling mod is done more for oiling to the main bearings but it allows more oil to flow around hot areas. That is the McCandles small block mod of drilling the mains feed from 1/4 inch to 9/32 or 5/16's inch and all larger feed oil ports to 1/2 inch.
But on my 65 B-cuda I was running the standard open element air cleaner. My Barracuda was always over heating and pirc'ing the fuel. The biggest cooling fix was to use a sealed dual snorkel air cleaner housing from a Cop Car and run two 4 inch drier hoses under the bumper. Not ram air but a 'Cold Air Intake' system. This single mod cured 95% of my over heating. Let the Chubby and Dorf drivers run open air cleaners and suck up HOT air from under the hood....
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: Small block guys cooling. Question
[Re: burdar]
#2722485
12/08/19 10:39 AM
12/08/19 10:39 AM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,908
Nebraska
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The bypass allows the coolant in the engine to circulate while the thermostat is closed. The bypass lets the engine coolant heat up uniformly so no hot spots are created. Once the thermostat opens, it does bypass some water that could be going through the radiator and cooled. I've sometimes wondered how big the bypass really needs to be in order to work the way it was designed to. Could a restrictor be added that would maintain the bypass function yet allow more coolant to be cooled by the radiator? Has anyone done it? Not much to add other than that for size big blocks use a 7/16-1/2" bypass internal to the water pump housing. There is no or minimal cooling circulation with the stat closed, and I always thought the bypass was to protect the heater core from excessive pressure.
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