Leeroy_25

Just wondering f the RAD cap rating has much impact on cooling performance or can cause seal failure if to high? I only ask as mine seems to get hot quite quick. I am still setting it up and fine tuning idle and cold start is not quite there. but today I ran it for maybe 15mins in the garage light revving and idle and the ECU registered 99degsC before I shut off. Fans had kicked in as well but did not seem to bring it down although I think they only just kick in around there and I was planning on waiting to see what happened. I think the ECU takes temp form the top front of the engine by the fan switch and the instrument cluster gets a reading from te back of the blockif I recall. That was reading a touch less I think.
Timing may be out as I have not got that far but anyway. I notice the rad hoses seems really tort. as in full to bursting. Should the rad cap be releasing water into the expansion tank at this point? I am not sure when it comes into play. I have a low temp thermostat fitted and a 1.3bar rad cap.. Should I have a light rad cap to release the water pressure sooner? Will that help with cooling or do I need to be looking at rad flow and timing?
I will shortly be removing my underdrive pulley and replacing it with a stock size pulley to increase the pump flow as I have an idle pulley now.

just want some thoughts really.

Cheers
Lee

hsmidy

In a nutshell the higher your cap pressure the higher your system boiling point will be. to give you an idea a lot of factory stuff from Japan comes in at 0.9 bar (13psi) yours will be about 18 psi.

The higher your cap pressure, the higher your coolants boiling point will be.

Its worth noting that the rest of your cooling system will be subjected to this pressure and may cause issues (leaks etc).

Leeroy_25

No leaks.. But I presume that is loading the water seals more? Would you drop down from a 1.3bar cap to 1.1? Or are the seals pressie tested to much higher anyway?

Thanks
Lee