...agreed, total mystery. Nice bill of materials would be useful.
Other than that if your oil temp goes over 120, stick the heater on, aim it at the windscreen and open your quarter lights / windows. That’ll draw the heat away from the engine and it’s free
Finally, pop a 80 (instead of 87) degree thermostat in for £6 and let the radiator do the work of cooling.
Oil cooler will work much better at the front of the van.
Don't get too hung up on how many rows either, area / efficiency is what matters. I haven't looked to see how much room there is at the front of a T25, but something like this would work well from a packaging and cooling perspective. it's normally mounted in front of, at the bottom / just below the rad. Fewer concerns about stone damage too.
These coolers are fitted to Saab Aeros, which deliver 260 HP, so plenty of cooling capacity
Available second hand if you want, you just need to figure out how to mount and route the pipework
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
The idea would be to fit it in the 'void' to the right of the engine so that it is in the air flow created by the pillar vent, would probably require a suitable shorter oil filter.
Not as efficient s a front mount but still increases cooling capacity due to increase in exposure and also minor increase in oil capacity.
Last edited by ash1293 on 28 Jun 2018, 18:46, edited 1 time in total.
I think you're getting into a whole other area of discussion as to how much air actually flows down the air vent on a WBX. (it obviously does on an air cooled). I believe there are pages of heated discussion on that subject and air diverters for the vents on the US forums
In combination with a fan to force airflow that could also work
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
As for airflow - it really doesn't matter about the much debated up or down, in or out - even without significant airflow the cooling effect will still be present.
Last edited by ash1293 on 28 Jun 2018, 18:51, edited 1 time in total.
I lost the will to live after a few pages of the thread on airflow in the rear vents
Plenty of air under my Caravelle
Yeah..... the problem is exposure to stones being thrown up, holes in an oil cooler can end in a bad way.
The only rear engined car I can think of that doesn't have front oil coolers are early low powered 911's (17 litre dry sumped) and VW 411/412, both of which had proper engine mounted coolers.
I think I read more of the thread..... it's a bit like QI, one of those questions where "Nobody Knows"
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
ash1293 wrote:
As for airflow - it really doesn't matter about the much debated up or down, in or out - even without significant airflow the cooling effect will still be present.
I wouldn't agree on that. There's a reason why rads are up front and they have fans on for when the engine is getting hot.
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine
I have raced many cars over the years with rads in the bootfloor that worked easily as well as a front mount
Especially on a Brick.
You just need to think about high and low pressure areas.
plenty of both on the T25
I also saw a fan to fit that cooler that Ash linked and a kenlowe type thermoswitch setup
the problem with front mounting an oil cooler on the front of a T25 is pressure drop with lines that long
I would rather lose a little effectiveness and keep oil pressure.
(that's only a guess but I know from my work that long oil hose runs sap pressure quite effectively) (Aerospace)
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84 CaravelleGL 1.9 DG WBX Bronze Beige Metallic auto
ash1293 wrote:
As for airflow - it really doesn't matter about the much debated up or down, in or out - even without significant airflow the cooling effect will still be present.
I wouldn't agree on that. There's a reason why rads are up front and they have fans on for when the engine is getting hot.
Agree if we are talking about a main radiator but we are on about an auxially oil cooler here supplementing the cooling not replacing it.
While certainly quite a few race hillman imps & derivatives went for front mounted conversions thos that retained the rear mounted radiator often would fit an additional oil cooler in the bay. I also know whan I was running a fast road engined mini I crammed in an oil cooler near the top of the engine bay opposite side to the side mounted radiator to good effect ( couldn't quite squeeze it in behind the grill I was running)
Bottom line is that by increasing the surface area exposed to air (or water in liquid oil oolers) you are incrasing the cooling capacity unless the air temperature is greater than the oil itself. While not as efficient as a radiator placed in direct airflow it should still have a significant measurable affect.
