cooling system help

[slogger]

Originally Posted by RCCob

Hi guys and thanks for the replies it has given me plenty to think about. So what I've done for a start is put a small bleed in the stat housing as hi as possible at the same time I replaced the stat for a 74 degree apposed to the 82 that was fitted. The other problem is the expansion tank dose not have an air bleed return to the top of the tank. It just has one at the bottom which at the moment goes to the top of the rad. If the bleed mod dose not work I will have to fit a pipe from the bleed to the top of the expansion tank. I have attached a pic of the expansion tank and the stat before the mods. I just need some fine weather to test it now wish full thinking I know.

You need to connect the bleed from the stat to the bottom of the tank not the top. The vent at the top is just that, a vent to let pressure out be it air or water, and air back in on cooling. If your Stat pipe is connected there you will just push the coolant out past the cap and draw air into your system on cooling making things worse. You may also fail to pressurise the cooling system and in turn boil the coolant.

[Purple AK]

Well Spotted Craig
Russ. Craig is 100% spot on with that comment! More Cobs have been lost through Fire than by Impact Damage. ALL due to glass filters

[RCCob]

Originally Posted by craggle

Before you drive the car again please, please, please remove that fuel filter.

Those glass or plastic filters will not withstand the heat directly above an engine and will split, crack or leak sooner or later spraying fuel under pressure onto the top of a very hot engine.

There is really no need to have a filter under the bonnet. Keep it at the rear of the car away from any heat and vibration. If you really insist on one under the bonnet then get a Filter king filter housing and mount it firmly on the bulkhead.

Good luck with the cooling system.

Cheers

Craig.

Cheers Craig it was the previous owner who fitted it. That will now be put to the top of my list of jobs for tomorrow, I did wonder why there was two filters fitted, there is one in the boot as well.

Cheers Russ

[RCCob]

Originally Posted by slogger

You need to connect the bleed from the stat to the bottom of the tank not the top. The vent at the top is just that, a vent to let pressure out be it air or water, and air back in on cooling. If your Stat pipe is connected there you will just push the coolant out past the cap and draw air into your system on cooling making things worse. You may also fail to pressurise the cooling system and in turn boil the coolant.

I hear what you are saying, but I meant I would have to add a third pipe welded in to the top of the tank or completley replace the tank.

[craggle]

That's good Russ.

I have seen too many kit and custom cars with filters mounted on top of the engine. Very dangerous practice.

One filter is enough really. You should have one before the electric pump and that's it. Quite a few people fit one after the pump but I have never seen the need.

The coolant bleed tube on my car goes from the top of the thermostat / top hose and goes back to the top of the header tank. This is just to vent air from the highest point back to the header. It is a small pipe though to limit the amount of coolant that will flow through the pipe back to the header. Too much flow and it will divert water flow from the radiator.

Craig.

[RCCob]

Originally Posted by craggle

That's good Russ.

I have seen too many kit and custom cars with filters mounted on top of the engine. Very dangerous practice.

One filter is enough really. You should have one before the electric pump and that's it. Quite a few people fit one after the pump but I have never seen the need.

The coolant bleed tube on my car goes from the top of the thermostat / top hose and goes back to the top of the header tank. This is just to vent air from the highest point back to the header. It is a small pipe though to limit the amount of coolant that will flow through the pipe back to the header. Too much flow and it will divert water flow from the radiator.

Craig.

Yes I agree I was thinking of using some think like 6mm high pressure pneumatic pipe and fittings, as the fittings are much smaller. This would allow me to fit a 8mm taper fitting into the stat with out the need for welding.

[slogger]

Originally Posted by craggle

That's good Russ.

I have seen too many kit and custom cars with filters mounted on top of the engine. Very dangerous practice.

One filter is enough really. You should have one before the electric pump and that's it. Quite a few people fit one after the pump but I have never seen the need.

The coolant bleed tube on my car goes from the top of the thermostat / top hose and goes back to the top of the header tank. This is just to vent air from the highest point back to the header. It is a small pipe though to limit the amount of coolant that will flow through the pipe back to the header. Too much flow and it will divert water flow from the radiator.

Craig.

Craig, RCCob has the same tank as mine and the top pipe is above the diaphragm in the pressure cap. He would not be circulating the coolant, as per modern cars, but blowing it out of the cap. If his cap has a rubber seal in the top he will not have any pressure relief either until a hose blew!!

RCCob has stated that he doesn't to mod / weld the tank so I think he his talking about using the vent connection at the cap. RCCob please can you confirm what you intend to do.

[craggle]

Ian

If Russ adds a bleed tube to the header tank it will have to be a new pipe fitting welded in the top of the tank below the cap level.

Craig.

[slogger]

Originally Posted by craggle

Ian

If Russ adds a bleed tube to the header tank it will have to be a new pipe fitting welded in the top of the tank below the cap level.

Craig.

Thats what I was getting at. Maybe I misunderstood, but I have seen one cooling system explode in a Locust and the drivers burns weren't nice.

[RCCob]

Originally Posted by slogger

RCCob has stated that he doesn't to mod / weld the tank so I think he his talking about using the vent connection at the cap. RCCob please can you confirm what you intend to do.

Hi guys, Done a couple of jobs to day first off the fuel filter has gone, safe now also went to the garage and put some fuel in her, after doing the bleed mod and stat change we are running at around 90 degrees, But I didn't go very far as the weathers not good today. I have attached some pics, the intention is to go from the stat housing (pic 2) to the top side of the expansion tank (pic 1) I intend to use 6mm OD high pressure pneumatic hose as the bleed, this has an Id of about 3mm which should restrict any flow of water back through the expansion tank. See (pic 3) one end has a bulk head fitting which will go to the tank and the other has a tapper fitting which will go to the stat housing. hope this has cleared things up.

Regards Russ