[Tigers] BMR radiator

Fri Jul 2 16:26:40 MDT 2021

Just chiming in on the radiator hose. I have had that happen where the hose collapses under load. It doesn’t take much acceleration to make it collapse. I think that would be my first item on the to do list. I think auto parts stores sell em. It’s been years and my memory is a little fuzzy though. I do remember having to cut it down to size. Could be I bought a hose that had on in it and then modified it for my application. Good luck.
Cheers
Jim B.

> On Jul 2, 2021, at 1:26 PM, Owain Lloyd <owain.lloyd at gmail.com> wrote:
> 
> 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 <mailto: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 <mailto: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 <mailto: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 <mailto: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 <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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> -- 
> Regards
> 
> Michael King
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> Regards
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> Michael King
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