Lotus Elan

Fat or Wide?

PostPost by: shynsy » Wed Jul 10, 2024 1:15 pm

Hi Folks,
I am choosing a cooling solution for my +2..
What are peoples view of:
1) standard narrow
2) standard fat
3) wide

Car is standard tune, modern SPAL fan(s), normal road usage in the UK but also potentially some alpine passes in the summer heat. I have run the car with a standard rad and SPAL fan and seems OK in the temps at the mo (freezing!) but suspect the capacity is not too much higher. In the past i had a +2 with standard rad and temps would rise above 90 as speed increased above 70 on the autobahn (which was annoying). Baffling and foam etc will be renewed to optimse cool airflow..

Cheers
Tim

PS I should say that one of the things I cannot abide is a car that overheats!
Current Cars: '72 Elan +2S130/5, '72 Triumph Stag 3.9L, '72 Spitifire Mk IV. Past Cars: '72 Triumph TR6 (supercharged), '70 MG Midget (K-Series + Type 9), '76 Triumph 2500TC, '72 Lotus Elan +2S130/4, '76 Triumph Spitfire 1500.
shynsy
Second Gear
Second Gear
 
Posts: 69
Joined: 15 Mar 2023
Location: United Kingdom

PostPost by: cliveyboy » Wed Jul 10, 2024 5:39 pm

Tim
Buy an old full width radiator from an S3 or early +2. Get it rebuilt with a 2 core dense matrix and you will never regret it.
I have one on my Sprint with rear mounted Revotec fans. I have run it in 30C+ temps and it always stays cool.
Only time the temperature rises is when stationary, the fans then cut in and temp goes back down.
I know of various owners with same system who have done alpine rallies and very hot desert like runs with no issues.
Clive
1972 Elan Sprint FHC
cliveyboy
Fourth Gear
Fourth Gear
 
Posts: 882
Joined: 22 Sep 2003
Location: Oxfordshire UK

PostPost by: mbell » Wed Jul 10, 2024 7:33 pm

I have setup mentioned (and designed/made by) Clive. I had no issue with heat even in Texas hot summers. It could idle in the garage in temps approaching 40c with fans cutting in and out at a reasonable duty cycle.
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
mbell
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2739
Joined: 07 Jun 2013
Location: Austin, TX (UK Ex-pat)

PostPost by: shynsy » Wed Jul 10, 2024 7:48 pm

cliveyboy wrote:Tim
Buy an old full width radiator from an S3 or early +2. Get it rebuilt with a 2 core dense matrix and you will never regret it.
I have one on my Sprint with rear mounted Revotec fans. I have run it in 30C+ temps and it always stays cool.
Only time the temperature rises is when stationary, the fans then cut in and temp goes back down.
I know of various owners with same system who have done alpine rallies and very hot desert like runs with no issues.
Clive

Ok sounds good. Just need to find an old carcass.. i have a bloke locally who recores old rads.
Tim
Current Cars: '72 Elan +2S130/5, '72 Triumph Stag 3.9L, '72 Spitifire Mk IV. Past Cars: '72 Triumph TR6 (supercharged), '70 MG Midget (K-Series + Type 9), '76 Triumph 2500TC, '72 Lotus Elan +2S130/4, '76 Triumph Spitfire 1500.
shynsy
Second Gear
Second Gear
 
Posts: 69
Joined: 15 Mar 2023
Location: United Kingdom

PostPost by: mbell » Thu Jul 11, 2024 11:39 am

shynsy wrote:Just need to find an old carcass..


It a triumph spitfire rad with inlet/outlet rotated. So shouldn't be hard to find, just need to get the same changes made if its a spitfire radiator when you have it re-cored.
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
mbell
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2739
Joined: 07 Jun 2013
Location: Austin, TX (UK Ex-pat)

PostPost by: rgh0 » Thu Jul 11, 2024 12:06 pm

I use the wide early Spitfire radiator in my Elan fitted with a 3 row core and with the inlet rotated and the filler relocated as was down when Lotus used it. Works in a 180 HP race engine at 40C on the track :) The fans only kick in when I come back to the paddock after a race

cheers
Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 8940
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: shynsy » Thu Jul 11, 2024 4:27 pm

Had wondered.
I have a mk IV spitfire in the same garage. Will hunt down a carcass..
Tim
Current Cars: '72 Elan +2S130/5, '72 Triumph Stag 3.9L, '72 Spitifire Mk IV. Past Cars: '72 Triumph TR6 (supercharged), '70 MG Midget (K-Series + Type 9), '76 Triumph 2500TC, '72 Lotus Elan +2S130/4, '76 Triumph Spitfire 1500.
shynsy
Second Gear
Second Gear
 
Posts: 69
Joined: 15 Mar 2023
Location: United Kingdom

PostPost by: cliveyboy » Sun Jul 14, 2024 6:49 am

Tim
I did notice you had a Spitfire.
I believe the Triumph radiator is slightly taller by about 30mm. But you just put a shorter core in. If using a Triumph radiator on a Plus 2 you will need to drill an extra fixing hole in the bracket about half way down.
Also the Plus 2 bottom hose can get very close to the steering column and rub. So make sure the outlets are orientated correctly. I have found on Lotus radiators that the orientation of bottom outlet can vary depending if it came off a S3 or a Plus 2. Only slightly. The bottom outlet points more upright as opposed to the outlet twisted slightly to the 1 O clock position as you look at the back. If you have no issues with your old rad then use that bottom hose orientation.
You could also take the opportunity to get a threaded boss soldered on to replace the Otter switch. That way you can use a modern fan switch and its less likely to fall out.
Clive
1972 Elan Sprint FHC
cliveyboy
Fourth Gear
Fourth Gear
 
Posts: 882
Joined: 22 Sep 2003
Location: Oxfordshire UK

PostPost by: shynsy » Sun Jul 21, 2024 6:00 pm

Spitfire wide Rad acquired.
Tim
Attachments
20240721_185813.jpg and
Current Cars: '72 Elan +2S130/5, '72 Triumph Stag 3.9L, '72 Spitifire Mk IV. Past Cars: '72 Triumph TR6 (supercharged), '70 MG Midget (K-Series + Type 9), '76 Triumph 2500TC, '72 Lotus Elan +2S130/4, '76 Triumph Spitfire 1500.
shynsy
Second Gear
Second Gear
 
Posts: 69
Joined: 15 Mar 2023
Location: United Kingdom

Total Online:

Users browsing this forum: rideaway and 13 guests