[Tigers] BMR radiator

[Owain Lloyd]

Will reply in more detail tomorrow - but that may be important.  Thanks and
good thinking.

I forgot I also changed the lower hose because it was a bit chafed.  Tried
to install a sprinkler spring but it was a bit too stiff and I couldn’t get
it fully in.  So left it out.  That said I wasn’t revving high.  It’s super
long geared and has so much power at 2500 rpm.

I’m reluctant to try diluting with 50% water because there’s no turning
back at that point.  This engine has never seen water.

On Fri, 2 Jul 2021 at 16:31, michael king <michael.s.king at gmail.com> wrote:

> Owain,
>
> Were there any other changes you made when swapping the radiator out?
>
> Did you change the lower radiator hose? Does it have a spring in it to
> stop it collapsing and restricting at higher rpm? That will cause issues at
> speed but not idle
>
> The gauge being mechanical rules out usual sender/ earth issues.
>
> What depth is the core on the new rad v old one, maybe fan is to close to
> the radiator and not pulling properly ( though that should more be an idle
> issue than on the run )
>
> What is the fin density and how many cores... Maybe its not getting as
> much air passing cleanly through and not dissipating as well as the
> fluidyne.
>
> Do you run an electric fan? I once had my car overheat as i had the wires
> reversed and the fan was spinning reverse and pushing air away from the
> grill whwn i came on... But again....more an issue at idle.
>
>
> On Friday, 2 July 2021, Owain Lloyd <owain.lloyd at gmail.com> wrote:
>
>> Fluidyne - right.
>> indeed.  there is no pressure increase at that temperature with Evans.
>> you can literally remove the cap with your bare hand.
>> the specific heat capacity isn't quite as good (it's hard to beat water
>> after all), but the advantages in terms of lack of corrosion (and lack of
>> expansion) are worth that for me.
>> the point is that i ran Evans before with the Dale rad and it never ran
>> that hot.  it was running fine at the high temp (I drove it home at that
>> temp - no problems - fueling perfect) but it reaches a point where you just
>> don't want the engine too hot.  iron block, aluminium heads and pistons -
>> the hotter it gets the more the expansion differences will become.
>>
>> On Fri, Jul 2, 2021 at 12:23 PM michael king <michael.s.king at gmail.com>
>> wrote:
>>
>>> Hey Owain,
>>>
>>> Not sure about the BMR, but the Dales ones were actually Fluidyne
>>> radiators.
>>>
>>> The Griffin ones were a separate company and IIRC had the glued together
>>> cores.
>>>
>>> I hear different things about evans.. one of the things i have heard is
>>> that the coolant runs hotter, but that it doesn't boil, so i guess to ask:
>>> Apart from it registering physically hotter, was it suffering any
>>> adverse effects?
>>> Did it start vaporising the fuel?
>>> Did it start running rough?
>>> Did it puke the coolant?
>>>
>>>
>>>
>>> On Fri, 2 Jul 2021 at 17:54, Owain Lloyd via Tigers <
>>> tigers at autox.team.net> wrote:
>>>
>>>> Last year my Dale A (Griffin?) radiator cracked and I replaced it with
>>>> this one from BMR in the UK:
>>>>
>>>>
>>>> https://www.motorsportradiators.co.uk/store/Sunbeam-Tiger-Aluminium-Radiator-p146886570
>>>>
>>>> Not really used the car since except a couple of short trips.
>>>>
>>>> This week I was going to take the tiger out for a run over some
>>>> mountain passes but after about 30 minutes, no traffic, it was running at
>>>> well over 100C / ~230F.  I returned home and checked everything over.
>>>>
>>>> 1. Full of fresh Evans waterless coolant.
>>>> 2. gauge is mechanical
>>>> 3. horn holes blocked, along with gap between rad and crossmember.
>>>> 4. fan shroud in place with 13" flex fan on water pump hub.
>>>> 5. doesn't overheat at idle even when left running for 30 minutes.
>>>>
>>>> I've NEVER had a problem with overheating at speed before.  the only
>>>> issues I had were at idle or in traffic / slow speed but even those had
>>>> been solved by all the above.  engine is a 490hp 347, but wasn't a problem
>>>> before.
>>>>
>>>> everything is pointing at the BMR radiator just being a bit crap and
>>>> not doing as good a job as the Dale rad.  anyone running one of these?
>>>>
>>>>
>>>>
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>>>>
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>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>> --
>>> Regards
>>>
>>> Michael King
>>>
>>>
>>>
>>
>>
>
> --
> Regards
>
> Michael King
>
>
>
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