is there a radiator we can buy that will take the full gpm of the waterpump at wot - Page 2 - ZR-1 Net Registry Forums

Karl · 09-03-2019

Quote:

Originally Posted by VikingTrad3r

Furthermore, would an underdrive pully not exacerbate the low rpm low flow rate issues which also result in an overheat solution.

I never had a cooling issue with my '92 in traffic with the AC on. Granted I usually run 70/30 distilled water to antifreeze and had a fluduine radiator also.

The AC on my :93 does not work but no cooling issues.

Edit: Pete also drilled a few holes in my t-stat to increase flow and I have a DeWitt aftermarket radiator.

Ultimately a electronic water pump is best but do you want to risk the pump not working for some reason and risk blowing an engine?

klork · 09-05-2019

So if you get a better radiator that can withstand more pressure could you take apart the bypass and shim the spring so it doesn't bypass till a higher pressure?

VikingTrad3r · 09-05-2019

im going to find out! just bought a dewitts.

A26B · 09-05-2019

Quote:

Originally Posted by klork

So if you get a better radiator that can withstand more pressure could you take apart the bypass and shim the spring so it doesn't bypass till a higher pressure?

Assuming operating temp is reached and the thermostat is functioning and fully open;
Installing a different radiator with increased flow capacity, will reduce the back-pressure at the bypass loop. In turn, the bypass valve spring on the thermostat will remain closed until the flow rate is increased sufficiently to once again create sufficient pressure to open the bypass.

Bear in mind that the thermostat at the discharge side of the radiator also contributes to back pressure and will at some point, yet to be determined, become the next critical bottleneck to eliminating the bypass system.

Jagdpanzer · 09-05-2019

Before you start changing the cooling system design a full understanding of the original system is essential. The original system relies on significant flow of coolant to be continuously circulated through the engine at pressure to eliminate hot spots and steam pockets from developing. The spring loaded bypass control valve on the thermostat plays a important role in this by partially blocking the bypass flow so coolant pressure will build inside the engine. Once the engine discharge temperature is in the control range of the thermostat it begins to open allowing cool water from the radiator to mix with the water making its way around the bypass control valve which shifts due to the pressure differential to compensate for flow now going through the radiator. Another important role of the bypass control is to limit the maximum pressure on the cooling system during sudden high rpm operation. The thermostat by itself is not capable of reacting fast enough under these circumstances to control the peek pressures that can develop.

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VikingTrad3r · 06-27-2022

Coming back to my 2019 post with an update.

I found for quite a while that I simply wasn't a good enough driver on track that I would even push my car to the point of overheating the factory system.

This year (after acquiring data, via the Garmin Catalyst) i reached the max capacity of the factory system. I removed the factory unit and installed the full aluminimum unit.

Furthermore, I did the Tyler Townsley mod and cut the spring in my thermostat.

Results are:

Highway cruise is no longer an issue in 6th, it easily holds 70-80c at highway cruise.
My AC is actually COLD.

sustained high rpm runs where the LT5 is allowed to run up several times per lap above 6000rpm have resulted in a max temp of 113c on and ambient 30-34 day on the tarmac.

Typically, temps are not higher than 104 on track. But sustained high rpm will hit 113c. My prior trip to the track they hit 110c. I think I am pushing the car harder and harder (and my performance on track is showing it) and i might bump up against the limits of this setup too.

Any comments from the experienced crowd appreciated!!!

I suppose the Pirate Team removed the crossover, installed a monster high GPM flow rate rad, and let er buck hey?

09-05-2019	#12
klork Join Date: Oct 2018 Location: ohio Posts: 68	Re: is there a radiator we can buy that will take the full gpm of the waterpump at wo So if you get a better radiator that can withstand more pressure could you take apart the bypass and shim the spring so it doesn't bypass till a higher pressure?

09-05-2019	#13
VikingTrad3r Join Date: Jan 2018 Location: Calgary, Canada Posts: 72	Re: is there a radiator we can buy that will take the full gpm of the waterpump at wo im going to find out! just bought a dewitts.

09-05-2019	#15
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,646	Re: is there a radiator we can buy that will take the full gpm of the waterpump at wo Before you start changing the cooling system design a full understanding of the original system is essential. The original system relies on significant flow of coolant to be continuously circulated through the engine at pressure to eliminate hot spots and steam pockets from developing. The spring loaded bypass control valve on the thermostat plays a important role in this by partially blocking the bypass flow so coolant pressure will build inside the engine. Once the engine discharge temperature is in the control range of the thermostat it begins to open allowing cool water from the radiator to mix with the water making its way around the bypass control valve which shifts due to the pressure differential to compensate for flow now going through the radiator. Another important role of the bypass control is to limit the maximum pressure on the cooling system during sudden high rpm operation. The thermostat by itself is not capable of reacting fast enough under these circumstances to control the peek pressures that can develop. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

06-27-2022	#16
VikingTrad3r Join Date: Jan 2018 Location: Calgary, Canada Posts: 72	Re: is there a radiator we can buy that will take the full gpm of the waterpump at wo Coming back to my 2019 post with an update. I found for quite a while that I simply wasn't a good enough driver on track that I would even push my car to the point of overheating the factory system. This year (after acquiring data, via the Garmin Catalyst) i reached the max capacity of the factory system. I removed the factory unit and installed the full aluminimum unit. Furthermore, I did the Tyler Townsley mod and cut the spring in my thermostat. Results are: Highway cruise is no longer an issue in 6th, it easily holds 70-80c at highway cruise. My AC is actually COLD. sustained high rpm runs where the LT5 is allowed to run up several times per lap above 6000rpm have resulted in a max temp of 113c on and ambient 30-34 day on the tarmac. Typically, temps are not higher than 104 on track. But sustained high rpm will hit 113c. My prior trip to the track they hit 110c. I think I am pushing the car harder and harder (and my performance on track is showing it) and i might bump up against the limits of this setup too. Any comments from the experienced crowd appreciated!!! I suppose the Pirate Team removed the crossover, installed a monster high GPM flow rate rad, and let er buck hey?