Question about water flow in a modified radiator on a Pinto 2.0 ltr engine

[Eduardo Benech]

Hi mates, I have this situation: When I swap into my MK2 the 1600 X Flow to a 2.0 ltr Pinto engine, in order no to cut the sheet under the radiator, I build one specially, shorter enough to fit and twice deeper. Also i put in the front an electric push blower better than the older one. OK, everything goes OK when the car is in motion, but when I am in the starting grid the temperature raises quickly to about 100/110 ° F.

So I came to think what if I underdrive the crank pulley say 25% so as I have a slower water flow on the radiator to cool the water better. Of course I am thinking to put a restriction before the water enters the engine so as to keep the water flow speed as before. (Also I dont even know if this last part is necessary).

Please let me have your kind advices about this situation

Cheers

Eduardo

[Eduardo Benech]

Sorry mates, where it says 100/110° F it should say 100/110° C.

Cheers

Eduardo

[snapper1]

Things to try before under driving the pump
Earlier opening thermostat, I use 82 degree
Make sure the fan thermostat turns fan on early enough
Make sure radiator airflow is blocked around the sides and top
Is the fan big enough to cover most of the radiator?
Pull fans are better than pushers
You can buy twin speed fans
Can hot air escape easily from the engine bay?
Is the exhaust heat wrapped to reduce engine bay heat

[Eduardo Benech]

Things to try before under driving the pump
Earlier opening thermostat, I use 82 degree
Make sure the fan thermostat turns fan on early enough
Make sure radiator airflow is blocked around the sides and top
Is the fan big enough to cover most of the radiator?
Pull fans are better than pushers
You can buy twin speed fans
Can hot air escape easily from the engine bay?
Is the exhaust heat wrapped to reduce engine bay heat

Hi snapper1. Sorry it took too long for me to answer you, but I have been hospitalized for some days. Thank you for your kind advices, I will follow them carefully, they will help me to solve my problem.

Cheers,

Eduardo

[hawk1903]

Can you share the details of the radiator in the photo ?
All the above points are absolutely valid.
As far as I know the restrictors are used at the water exiting the engine. ( before the radiator entry ) in order to slow down the circulation and keep the cooler coolant longer in the engine.
I have used 2 speed pull type Kenlowe fan if I remember corrcet. It was very powerful but pulls the idle down significantly.
I have also been using 74*C thermostat with 2 x 3-4mm holes.
Exhaust wrap also helps a lot.
What is the ignition timing ?