I am going to keep my header tank on the scuttle and run a pipe to the point marked on the diagram above

I have checked the heights and the header tank is 2 inches higher than the thermostat

David

The car I built for Teamtrain used all the old Ginetta parts for the cooling system,basically a Zetec engine,header tank feed to bottom hose and top hose to thermostat housing and return pipe in top hose to header tank above water level and no cooling fan at the time,ran hot but no problems as Zetec engines do run warm.

I think its just the way you have it routed David that could be the problem,cant remember exactly the way a thermo syphon system works but the idea is that it cools the water (obviously) as it goes through the rad from top to bottom or vice versa if you get what I mean and wrong routing will cause you grief.

I did my mods as described above. I ran the engine the allow it to warm up. I didn't put the cap on the coolant bottle. After about 5 minutes there was a surge of coolant that overflowed out of the top of the bottle. Is this from the thermostat opening expelling air ? Anyone got any ideas?

Thanks

David

Have you read the link Chris put up? there is a mentioning there about venting and overflowing.
Regards Mick.

The system is meant to run under pressure to hold the water against the cylinder walls otherwise the water will boil away from the hottest point's,cylinder walls and cyl head,so not having the cap on will allow it to boil.

Air will cause the same problem as there is no heat transfer to cool it.

Thanks

I think the best thing will be for me to take it our fun a spin this evening (with 10 jumpers on)

Ps have you been doing much flying lately? I went for a trip in a warrior the other week - stags shaw mast to Hexham the coast and back along the Tyne with my mate and son. Very very bumpy but good fun. It's gote thinking about selling the roadster to start a home build kit plane!

WHAT!:eek: You must be a serial project person like me.:cool:

Dual chk Friday morning 25 mins,Sunday 1hr 25 to Sherburn,1hr around Sherburn and 1hr 10 back to NCL in Warrior so Yes just a little.

Keep the car !!!!!

Was going to fly along the wall the other week but inversion had it covered and vis to low so flew up towards Otterburn then east and back down the coast.

Fly In at Eshott soon.

Are you two in the RAF?

No,I manage a garage in north east. :cool: