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SLVRBAKSLPZ
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Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

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8 hours ago, Predator1 said:

I vote for a new sticky to steer SAU'ers away from Hyperf**kINGSHITTune.. at least that way their builds wont be waiting for Pete Griffin to pull his finger out of his vag and do some fkn work.

 

A few other SAU members recently had to deal with their incompetence too.

One person that's doing a RB swap had enough and rocked up unannounced after a year of waiting around ended up getting other customer's parts off the shelf that day lol.

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SLVRBAKSLPZ Collaborator

SLVRBAKSLPZ

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5 hours ago, Dose Pipe Sutututu said:

A few other SAU members recently had to deal with their incompetence too.

One person that's doing a RB swap had enough and rocked up unannounced after a year of waiting around ended up getting other customer's parts off the shelf that day lol.

Lol wow. i need more of this story

  • 2 weeks later...
GTSBoy Grand Master

GTSBoy

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Posted

Hmm. Back in my day (186, 202, 308, etc), we used to put restrictors into the coolant circuit to reduce the flow rate, slow it down, and give it more hang time in the radiator to allow it to exchange heat to the air.

I haven't done any calcs myself to demonstrate where the overall heat transfer coefficient limiting step is (pick up of heat in the engine, convective transfer from water to tubes in the radiator or convective transfer from tubes to air).....but my gut instinct is that throwing a larger pump at the situation isn't going to do much. Maybe a little, but what you gain on the swings you lose on the roundabouts. Faster water flow increases convective HTC a little, but reduced residence time in the engine and in the radiator simply reduces the of water time in contact with metal available for heat to actually move. You end up moving less heat per unit mass of water going past the metal surfaces, and make up for it by moving more mass of water.

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SLVRBAKSLPZ Collaborator

SLVRBAKSLPZ

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20 minutes ago, GTSBoy said:

Hmm. Back in my day (186, 202, 308, etc), we used to put restrictors into the coolant circuit to reduce the flow rate, slow it down, and give it more hang time in the radiator to allow it to exchange heat to the air.

I haven't done any calcs myself to demonstrate where the overall heat transfer coefficient limiting step is (pick up of heat in the engine, convective transfer from water to tubes in the radiator or convective transfer from tubes to air).....but my gut instinct is that throwing a larger pump at the situation isn't going to do much. Maybe a little, but what you gain on the swings you lose on the roundabouts. Faster water flow increases convective HTC a little, but reduced residence time in the engine and in the radiator simply reduces the of water time in contact with metal available for heat to actually move. You end up moving less heat per unit mass of water going past the metal surfaces, and make up for it by moving more mass of water.

I've read that restricting the water passages and  helps the pressure to prevent steam pockets. I've also read that higher flow helps pull heat from the metal. The higher flow helps the heat dissipates from the coolant in the radiator faster.

What you were stating about slowing that coolant down to stay in the radiator seems to have changed. I think it's due to newer R/D, tech and CAD Sims etc. They see that is more beneficial to speed the fluid up in the system.

Idk what's right but it's all something to think about and find that good median.

I'm sure the results vary on motor design.

 

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