Lancia Motor Club

Model Technical and Interest => Lambda => Topic started by: davidwheeler on 10 October, 2021, 05:28:04 PM



Title: Radiator
Post by: davidwheeler on 10 October, 2021, 05:28:04 PM
Old Boot's radiator was last rebuilt after the crash some 20 years ago, with a honeycomb matrix which at first worked well but gradually has become more clogged until it has become impossible.  Vintage Radiator Co said "nearer 2000 than 1000" ( and, by past experience, meant nearer 4000 than 3000).   Now, I have an original radiator which consists of some 49 vertical 5mm tubes in a finny matrix with a faux honeycomb on the front, something that VRC can not do so I consulted Mr Google thinking to fit a modern core.  I came up with Cumbria Radiators Ltd who are some 20 miles away from me and who fitted a modern vertical tube core matrix with room at the front for a faux matrix for the grand sum of 624 all in.   It looks OK as it is but I am on the track of a honeycomb film to go on top (more later perhaps).
There is now only one problem.
With 2/3 of the core blanked off so far I still cannot get the engine temperature above 140 F.      A problem I am delighted to have!


Title: Re: Radiator
Post by: davidwheeler on 08 November, 2021, 08:14:32 PM
I have finally managed to get the water temperature up a bit by blocking off 3/4 of the radiator.    Out of town that got me to 160F but in a long traffic jam in Carlisle it got up to 195F so I turned the engine off while waiting.
It needs a thermostat.  I remember vaguely something about fitting stats to the upper tubes but two would be needed and of small (motorcycle) size otherwise cooling of the head would be asymmetrical.    I wonder about fitting one in the tube at the bottom from the block to the water pump?   Anyone tried this?


Title: Re: Radiator
Post by: JohnMillham on 09 November, 2021, 07:49:57 AM
I used to use 2 thermostats from a Malaguti (?spelling) scooter, but my car prefers to run cool, so I no longer use them. Would you like to try them?


Title: Re: Radiator
Post by: Sebastien on 09 November, 2021, 10:41:02 AM
David,
I wrote the article that was in the LWR Newsletter 3/2020 on thermostats.
That article is available on the LWR website, under the member login, using the search function for the archives - very useful!
So that you are spared the search for your password, etc. I have appended the article.
I recommend using the SYM thermostats, which have a much bigger passage section than the Malagutti.
I would not use a thermostat at the entrance to the water pump - this would close the water passage to the pump, and the pump would start cavitating!
Hope this helps.


Title: Re: Radiator
Post by: davidwheeler on 12 November, 2021, 09:46:16 AM
Sebastian.  I knew I had seen it somewhere.  Thankyou for that.  Not cheap at 27 each and not deliverable from Netherlands because the order is too small,  I have emailed them to see if there is a solution.  There is a dealer not too far away in Scotland which is currently still in the UK so I shall try there.    Do you have the dimensions to hand?


Title: Re: Radiator
Post by: Sebastien on 12 November, 2021, 10:05:00 AM
David,
Here are the dimensions, in mm.
I would check with scooter workshops in England - those SYM scooters are pretty much everywhere, and someone must maintain them, and have spare parts on hand.


Title: Re: Radiator
Post by: davidwheeler on 14 November, 2021, 10:37:13 AM
The thopught occurs to me, since it is not atm, possible to get the thermostats from Europe because of Brexit, that putting a stat in the outflow pipe pf the pump between pump and block should not cause problems with cavitation and would avoid pressurising the water in the block as well.


Title: Re: Radiator
Post by: Sebastien on 14 November, 2021, 11:01:39 AM
Have you tried: https://www.symuk.co.uk/parts-spares ??




Title: Re: Radiator
Post by: JohnMillham on 14 November, 2021, 11:57:04 AM
The thopught occurs to me, since it is not atm, possible to get the thermostats from Europe because of Brexit, that putting a stat in the outflow pipe pf the pump between pump and block should not cause problems with cavitation and would avoid pressurising the water in the block as well.
I think that would cause the engine to overheat. You don't want to slow down the cooled water from entering the engine, you want to slow down the hot water from entering the radiator. If the thermostat is down the bottom of the radiator, it would never open, as the water is already cooled. That's my theory, anyway!


Title: Re: Radiator
Post by: davidwheeler on 15 November, 2021, 11:20:48 PM
Well thought John!


Title: Re: Radiator
Post by: davidwheeler on 08 December, 2021, 09:52:55 AM
I used to use 2 thermostats from a Malaguti (?spelling) scooter, but my car prefers to run cool, so I no longer use them. Would you like to try them?

John kindly sent me these and I fitted them by placing them in the outlet pipes of the side panels/water manifolds having first drilled four small bypass (3mm) holes in the skirts.   They are retained by the rubber hoses which fit tightly around the skirt.
I took her out on a cold day with only 2/3 of the radiator blocked off and struggled to get the temperature above 140F, only managing 160F in a long traffic jam!   I shall have to solder up some of the holes.   I am amazed at how much more efficient is a modern core as compared with the honeycomb even when it was new.