Lotus Elan

Engine now needs a rebuild

PostPost by: pauljones » Fri Oct 20, 2017 2:27 pm

hi all.

After a bit of searching on web, i think im looking for an expansion bottle/tank. Other than a header tank.

Any thoughts?

Paul
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PostPost by: billwill » Fri Oct 20, 2017 6:12 pm

If you have the correct radiator inlet fitting and a pressure cap with the reverse 'suction' valve in it, then functionally any plastic bottle of one or two litres will do the job.

If you want an original bottle they might be silly prices now.

You know, I hope, that there should always be about 2 or 3 inches of coolant in the bottle. The heat expands air or coolant in the engine and drives some coolant out through the overflow to the overflow bottle. When the engine cools down later the air/coolant contracts and sucks coolant back up the overflow pipe into the engine/radiator.
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PostPost by: pauljones » Fri Oct 20, 2017 6:36 pm

Thanks,

I understand how the system works.
My coolant system uses a cliveyboy twin fan rad and his thermostat housing. I have nothing connected to the overflow pipe from this housing, it did and it was an origonal bottle but after coming back from a well know lotus specialist its strangely fallen off. Including the silicon hose that was there.
I dont lift the bonnet too often but when it blew its coolant thats when i noticed. So now im looking for either a nos bottle, but i happen to like my kidneys and my children. Or the other option is an expansion bottle in ally/ stainless. Not a header tank, which i would describe as having a lower outlet to feed the system from a reservoir.

My issue is i cant seem to find one so im asking if others have same or simmilar
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PostPost by: mbell » Fri Oct 20, 2017 7:33 pm

It can be bottom outlet/inlet, I use one of these. The key thing is it vents to air and isn't sealed or pressurized.
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PostPost by: pauljones » Sat Nov 18, 2017 2:09 pm

Hi guys.

Im looking for some plus 2 coolant hoses.
Id take an unused Cliveyboy set of four if its available, or just the two for the heater. Its the heater pair im looking for.

Here's hoping

Paul
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PostPost by: mbell » Sun Nov 19, 2017 2:33 am

One is just a straight run that you can do with standard 5/8" heater hose. The other needs a 90 bend at the heater core, I was able to get a suitable hose from a standard auto parts place.

The bigger issue is that the engine ends are 1/2" and the heater is 5/8". Lotus just tighten the 5/8" hose on the 1/2" fitting. On my car I fitted some 1/2 inner 5/8 outer hose over the engine connections. Then fitted the 5/8" hoses over them.
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PostPost by: pauljones » Sun Nov 19, 2017 9:14 am

Thanks,

Great info you gave me there, looks like another job for after winter now, bit annoying as i planned to use her more often. Its one thing after another.

Did you fit yours with engine in situ or did was it out? Looks very tight in there.Im thinking at the very least ill be taking off the inlet side completely.

Paul
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PostPost by: mbell » Sun Nov 19, 2017 3:42 pm

Pre cautionary while I had the engine out.

I think it's do able with engine in if you have access to the clips and hose aren't to stuck. I'd try twist rather than pull the hoses to break the seal. You ding want to break the heater matrix...

For fitting use plumbers silicon grease and they slide on easily.
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