Race Engine Forum UK

Thanks for the great forum. If I install a Moroso Oil Accumulator, do I need to install a "Big Wing" Sump. From what I can gather from doing a few searches they do a similar function and seem to cost approximately the same so I am thinking I may not need both. Secondly is a thermosat essential to maintain oil temperature with an external cooler. It will be for a 1608 that mainly does hillclimbs or sprints.

No, in the light of my exp with the Lotus Lada at Hethel a few years back (very fast circuit trials with std 2 liter sump and accumulator only) I don't think you will, but do use an oil cooler and gauge and keep the oil temp to 85 deg C max or you will certainly run a bearing.
Of course if you can afford to make a b/w sump, so much the better - but me, I think I would not bother, just keep a careful watch on your oil pressure gauge and low pressure warning light. Do not trust the old OE gauges - get race ones like Raceparts or Stack.

Don't forget that the accumulator will exhaust itself on long turns, be careful would be my best advice.


GC

Whilst an oil accumulator is good, I use an Accusump, there is one problem to address with all standard sumps. I had a fatigue failure of the standard baffling in my sump which allowed uncontrolled oil surge. Do one of two things. Re-do the welds in your standard sump and check for cracking or replace the baffles with more extensive extended ones.
thank you
Paul

Guy,
just to clarify. It is my understanding that the standard production (132 Argenta type) big sump is basically useless over anything more than fast road because it lacks any decent baffling etc. Thus the big wing sump to which you refer would be a custom built example, with baffles and trap doors, not the standard 132 type.

Thus an accumlator with any sump, regardless of the "big wing" claim, would be better. So that it is the accumulator that is inportant not the generic big wing sump.

Regards,
wal

Well, more or less!

However the best wet-sump system would be a properly boxed and baffled sump (like my 'big-wing' type, yes, odd name but it was around long before I made them) with an accumulator too.



GC

It is my understanding that the standard production (132 Argenta type) big sump is basically useless

Yes, that's what the Argenta sump is. From experience I would rate it worse than the standard 124 Spider 2L sump (in terms of cornering ability).

The reservoirs of a "big wing" type sump gives you additional time, before the Accusump kicks in.

As example, with a modified Argenta sump (baffels + trapdoors + windagetray-topcover).
When I drive fast around my favourite roundabout (lefthand corner-anticlockwise) and do a 270° turn, the following happens:
at about 150° the (too) small left-hand-side reservoir has evacuated completely and then the Accusump starts feeding oil in, which one can see from the oiltemperature significantly dropping (Accusump reservoir was ccooler). Out of the roundabout the oil temperature raises again to the level as before.

Thomas