Bebop
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- Joined
- May 26, 2020
- Member Number
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Sooooo, I'm planning to upgrade my cooling package in the buggy and will go to the biggest rad I can fit, which will be a 28x19 3 row unit.
Should I go single or dual pass ?
Dual pass makes plumbing easier for me but that's marginal. I have a LS based engine, meaning that I can find water pumps with either driver or pass side outlets no problem, it's just another expense.
Factory rad is single pass.
I plan to buy a DIY radiator kit and weld my own inlet/outlets/cap. I could make it single or dual pass. Dual pass is more work and potentially more problems like : welding closer to the core (harder), divider not sealing 100% etc...
I am reading conflicting info about single vs dual passes (and triple passes for that matter).
I've heard that single pass doesn't distribute eventy the temperature and dual pass increases pump load..
These guys seem to know what they're talking about and don't recommend a dual pass it seems :
https://www.stewartcomponents.com/index.php?route=information/information&information_id=13
I also read somewhere (forum sooo, take that with a grain of salt) that a certain style of rad is better at low RPM vs the other one being better for high RPM.
In both cases, there will be PLENTY of fan for low speed airflow.
Thanks for your help.
PS : Pagging HYDRODYNAMIC again
Should I go single or dual pass ?
Dual pass makes plumbing easier for me but that's marginal. I have a LS based engine, meaning that I can find water pumps with either driver or pass side outlets no problem, it's just another expense.
Factory rad is single pass.
I plan to buy a DIY radiator kit and weld my own inlet/outlets/cap. I could make it single or dual pass. Dual pass is more work and potentially more problems like : welding closer to the core (harder), divider not sealing 100% etc...
I am reading conflicting info about single vs dual passes (and triple passes for that matter).
I've heard that single pass doesn't distribute eventy the temperature and dual pass increases pump load..
These guys seem to know what they're talking about and don't recommend a dual pass it seems :
https://www.stewartcomponents.com/index.php?route=information/information&information_id=13
Double pass radiators require 16x more pressure to flow the same volume of coolant through them, as compared to a single pass radiator. Triple pass radiators require 64x more pressure to maintain the same volume. Automotive water pumps are a centrifugal design, not positive displacement, so with a double pass radiator, the pressure is doubled and flow is reduced by approximately 33%. Modern radiator designs, using wide/thin cross sections tubes, seldom benefit from multiple pass configurations. The decrease in flow caused by multiple passes offsets any benefits of a high-flow water pump.
I also read somewhere (forum sooo, take that with a grain of salt) that a certain style of rad is better at low RPM vs the other one being better for high RPM.
In both cases, there will be PLENTY of fan for low speed airflow.
Thanks for your help.
PS : Pagging HYDRODYNAMIC again