BBC Bypass Hose Flow Direction?

[BBShark]

I am going to plumb the bypass hose on a big block to a modern bypass syle heater valve. So, I'm not eliminating the bypass, I'm just re-routing it.

My question is, which direction does coolant flow through the bypass hose? I am pretty sure it's from the intake into the pump but just verifying.

Bypass Valve:

 

[mrvette]

I am very curious about that shit, as the olde tyme Poncho engines had that feature included in the design of the pump and intake, no biggie....but I note the SBC has no such plumbing, and the carb versions do not have a rear passage into the cooling system at ALL, just with the advent of Aluminum heads with the L98, which returns the rear crossover to the front/suck side of the pump.....

I know your question is about BBC, but my inquiry is along the same lines, and so WHY would it make much diff???

and many BBC's have aluminum heads, so I wonder if they did the SBC trick on that water flow....???

 

[BBShark]

SBC pump is bypassed internally.

 

[Twin_Turbo]

from manifold to pump, it's there so coolant circulates w. t-stat closed. You can eliminate it if you drill a couple of holes in the stat or get a robert shaw one.

 

[Belgian1979vette]

SBC pump is bypassed internally.

Depends on the pump.

The valve you showed in your post : is that electrically or vacuum controlled ?

I have an interest in this, as I just found out I have problems getting the engine to warm up with the Robert Shaw type thermostat that needs to be used with my pump.

 

[BBShark]

The valve you showed in your post : is that electrically or vacuum controlled ?

I have an interest in this, as I just found out I have problems getting the engine to warm up with the Robert Shaw type thermostat that needs to be used with my pump.

Vacuum

 

[mrvette]

The valve you showed in your post : is that electrically or vacuum controlled ?

I have an interest in this, as I just found out I have problems getting the engine to warm up with the Robert Shaw type thermostat that needs to be used with my pump.

Vacuum

I have one of them valves, controlled by a electric/vacuum switch/solenoid setting on a piece of plywood on top of the ducting under the dash, the coil is controlled by a switch on my console....I have had the switches for a long time, but the coil/solenoids came from a junkyard car...pulled about a dozen of them.....

 

[Twin_Turbo]

SBC pump is bypassed internally.

Depends on the pump.

The valve you showed in your post : is that electrically or vacuum controlled ?

I have an interest in this, as I just found out I have problems getting the engine to warm up with the Robert Shaw type thermostat that needs to be used with my pump.

You can see the vac servo in the pic, the big round part


I swear this looks identical to the GTO valve I used on the 92 LS1 swap instead of the stock heater bypass valve

 

[Belgian1979vette]

SBC pump is bypassed internally.

Depends on the pump.

The valve you showed in your post : is that electrically or vacuum controlled ?

I have an interest in this, as I just found out I have problems getting the engine to warm up with the Robert Shaw type thermostat that needs to be used with my pump.

You can see the vac servo in the pic, the big round part


I swear this looks identical to the GTO valve I used on the 92 LS1 swap instead of the stock heater bypass valve

Interesting because this could solve the heat up problem I have right now and still run a regular thermostat. However it would have to be an electrical controlled unit that is commanded by a coolant temp sensor.

Who makes these if they exist ?

 

[BBShark]

SBC pump is bypassed internally.

Depends on the pump.

The valve you showed in your post : is that electrically or vacuum controlled ?

I have an interest in this, as I just found out I have problems getting the engine to warm up with the Robert Shaw type thermostat that needs to be used with my pump.

You can see the vac servo in the pic, the big round part


I swear this looks identical to the GTO valve I used on the 92 LS1 swap instead of the stock heater bypass valve

Interesting because this could solve the heat up problem I have right now and still run a regular thermostat. However it would have to be an electrical controlled unit that is commanded by a coolant temp sensor.

Who makes these if they exist ?

Why would it need to be electrically controlled?

The bypass valve in the picture is used on a buch of cars. It is AC Delco PN 15-5533. It has 5/8 and 3/4 ports. There are lot's more like it that have other port sizes, I think Rock Auto list's the port sizes.

 

[Belgian1979vette]

SBC pump is bypassed internally.

Depends on the pump.

The valve you showed in your post : is that electrically or vacuum controlled ?

I have an interest in this, as I just found out I have problems getting the engine to warm up with the Robert Shaw type thermostat that needs to be used with my pump.

You can see the vac servo in the pic, the big round part


I swear this looks identical to the GTO valve I used on the 92 LS1 swap instead of the stock heater bypass valve

Interesting because this could solve the heat up problem I have right now and still run a regular thermostat. However it would have to be an electrical controlled unit that is commanded by a coolant temp sensor.

Who makes these if they exist ?

Why would it need to be electrically controlled?

The bypass valve in the picture is used on a buch of cars. It is AC Delco PN 15-5533. It has 5/8 and 3/4 ports. There are lot's more like it that have other port sizes, I think Rock Auto list's the port sizes.

Yes, ideally you would want to have the bypass open during warm up, closed when warm, unless going over an electric thermostat like you have for the fans, I do not see how you could arrange that with use of engine vacuum, unless there would be a significant difference in vacum between warmed up and not warmed up condition (which I think there is not) or unless you operate the valve manually.

My estimate is that a 5/8 hose would cause too much hot water to bypass the radiator when hot, causing a possible overheating issue. Therefor it's only needed during warm up. Remember the original hole in the small block pump is tiny compared to a 5/8 hose.

 

[BBShark]

The baypass valve shown operates exactly like your current system works if you had the heat setting on hot (vacuum to valve). I've never heard of overheating issues caused by having your temperature control on hot.