Lotus Europa Community
Lotus Europa Forums => Garage => Topic started by: europa88 on Wednesday,July 13, 2022, 06:34:25 AM
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Anyone know offhand the ID of the front radiator hoses on a twin cam? I have to order a straight hose to enable the fitment of an auxiliary EWP80 water pump. i don't want to drain the hose and I don't have any spares. I cant seem to find this by the usual searches.
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SJSportscars, £19 or £21 + VAT and postage.
https://www.sjsportscars.com/
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1.25" I believe
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Yes, 1.25 inches.
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Thanks guys...would this be the same for a UK Special, as the outer dimensions of my existing hoses are 42mm (1.65 inches) and I cant see the hose wall being that thick?
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Very much like this!
http://www.lotuseuropa.org/LotusForum/index.php?topic=3678.0
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I have had three different rads. Last meant for a 47. They all had 1.25 hose OD hose inlet/outlet.
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When I took my radiator out for some r&r, I made some plugs for the hoses from 1-1/4 PVC. Interference fit, so I think that would be a good ID for the hoses.
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I'm guessing mine have expanded with age...bit like me ;D
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So I fitted the Davies Craig EWP80 as an auxillary booster pump on the bottom rad hose (Recommended by DC as it would be normally primed with coolant as opposed to the top hose). As Lotsof 3146 R mentioned cavitation is an issue when the Lotus belt driven pump is ran past 2000RPM, my temps can actually increase to 93 Degrees and climbing on the Davies Craig controller readout! But on idle it will cool down faster than when not fitted, to 86 degrees when the fan cuts out (cuts in at 92 degrees). Seeing as I wanted this to forgo the need to rev the engine in traffic as the lotus pump flows very little, I think it should be ok? I fitted a valve in the bleed return to the swirl pot like Lotsof 3146 R did with little effect! Am I expecting too much from this setup?
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Photos!
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Another
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Again
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Cool pictures, europa88. You can put them in a single post if you want.
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Cool pictures, europa88. You can put them in a single post if you want.
I did try...and failed :)
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An update on the EWP80 Davies Craig electric water pump install. I may have condemned it too early. I disconnected the power and did some tests, albeit at a lowly 22 degrees C. It appears that at a steady 2k rpm there is absolutely no difference in the way the fan is able to control the rising temps and temps increased a few degrees the same as when the the pump was working, although very slowly. This was tested stationary with no ambient airflow. I know with airflow of 20MPH or more there is no issue whatsoever and the engine runs mid to high 80's with out drama.
So at idle though with the pump hooked up and working alongside the fan by the Davies Craig controller, it only takes 1.58 mins from fan kicking in at 92 degrees C to bring it down to 86 degrees C. Without the pump it takes just under 5 minutes so some definite benefits there.
Time to road test as I was previously concerned the Twink water pump was interfering with the DC pump and causing cavitation. The road test today of some 25 miles at an ambient temp of 25 degrees C proved that its perfectly fine and the DC pump did not appear to restrict the OEM one. All in all I was happy but it is yet to be tested in higher temps like we had in the UK a couple of weeks ago. I will also wire it on a timer to run after shutdown to mitigate heat-soak.
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Maybe I missed it but just wondering why you are using the EWP80 as an auxiliary water pump rather than as a stand alone unit. Have you tried to disconnect the mechanical pump (remove belt) and just use the DC pump by itself and see the results?
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I may do that at some point later. At the moment the OEM pump has only done about 10k miles so is relatively in good order. It was just to avoid what I thought at the time was a need to rev the engine to push coolant around in traffic ;D. I'm not unhappy with the result, it just didn't turn out how I expected. Oh and I already had a basic DC fan controller with 2 fan outputs (or 1 fan and an EWP) If I changed to a full time EWP I would need the updated controller...more bucks ;D