Lotus Elan

Radiator swirl pot

PostPost by: Andy8421 » Wed Jul 22, 2020 6:05 am

baileyman wrote:The 26R style tank is very interesting. It has a straight through pipe but with rather large holes in it. The box surrounds the holy part. I think what is going on is the water flows almost unimpeded with low turbulence through the pipe, and any air then gets trapped in the box. The exiting water is then even smoother and unaerated for the rad. I could be wrong. I'm just imagining what must be happening in there. And of course it does provide a high fill point.

John

That is interesting. The 26R part isn't a 'swirl pot' in the usual sense. Swirl pots (as the name suggests) really should be round and operate rather like a Dyson vacuum cleaner generating a vortex where the bubbles of air come out into the centre of the vortex and steam bubbles recombine. If everything is working well, then de-aerated water should come out the bottom and air out the top. The 26R pot seems to be more of a header tank than a swirl pot, particularly it has a straight through pipe inside and no vent.
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PostPost by: jasper2347 » Sat Jul 25, 2020 2:00 pm

Started something here haven't I. Our thing has not arrived yet, so can't comment on the results. We have never, even with the standard recovery bottle and correct cap, been able to take off the top hose when cold at the thermostat housing end and have any coolant come out. We had the same trouble on our hill-climb TR7 many years ago, radiator is lower than the engine. We did a similar mod to that with great results and no more problems. The post worrying about a steam explosion, the high pressure cap is to replace the original one on the radiator to save messing around sealing it off. We will move the original cap, which will release long before the other one, to the new filler along with the expansion tank hose into the original tank. Our main problem is sitting around at start lines and no air cooling the rad. We do have a fan over-ride switch to turn the fans on early if it's a warm day. Thanks for all your input. Will let you know what the outcome is next week when we get it fitted and running. Rob :D
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PostPost by: gus » Sun Jul 26, 2020 12:45 pm

You do not want a high pressure cap, you want a no pressure cap, if you have a second cap on the reservoir


IF you fill the radiator cold and start it with the cap off, coolant will come out of the filler as the coolant expands when it gets warm

While my +2 is not pushing anything but stock horsepower, with the fan on in any weather it will idle without overheating until it runs out of gas. Small radiator. Aftermarket modern fan
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PostPost by: jasper2347 » Sun Jul 26, 2020 2:43 pm

Thought about a sealer or no release cap, but that would mean sealing off the overflow pipe. Easier to just use the pressure cap. Suppose this would be a secondary blow off if the top cap failed for some reason, at least it would let go at it's own rated pressure. Have also kept the original top hose, so can revert to standard if any problems arise. Our little monster is a 1760cc full race motor, so runs a bit hotter anyway, usually around 90c. We aren't allowed anti-freeze or coolant liquids these days on certain tracks, so no cooling assistance from the anti-freeze. Never had any overheating issues, just don't like the thing being what I see as low on coolant. Motor was a bit 'spensive, so no failures are permitted. Looking forward to Harewood next month. As the car is road legal we can drive it there to give it good test run before the competitive runs start.
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PostPost by: jasper2347 » Mon Jul 27, 2020 5:15 pm

Got the filler on the car and it works great. Had a test run and very happy with the results. Even though the weather was quite warm this afternoon, the car ran cooler than it ever has. Thanks for all your thoughts and input. :D
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