I was talking to Russell at LMS the other day about brakes. At the end of the conversation i asked him which he thought was better…accusump or baffled sump. (Daft question i know as they only sell accusump, but anyway…)
He said that in the Toyota engine baffled sumps do not work, why i asked…“because they do nothing to solve the problem of oil starvation in the head”…Ah ok…and off i went.
It was only later that the significance of this statement dawned on me.
My question is, if we have a problem whereby parts of the head are starved of oil under heavy cornering can an accusump do anything about it. As far as i understood the accusump only kicked in when there was a loss of pressure…its not capable of sensing some parts of the head are not getting oil?
If there is an oil starvation problem in the head, baffled sump, accusump or dry sump would surely do nothing to help it. As i understand it the pick up in the sump is still getting oil (if it wasn’t we would be seeing bearing damage)
sorry its off topic, i have a standard exige s. running A048’s and an (ok) driver. Should i be looking into accusump as I plan on doing the ring and a lot of track days this year?
This is probably better than trying to explain it, from accusump themselves clicky
It is lack of pressure that starves the head. As a side note I am beginning to learn that quite a lot of track cars are having considerable cam wear over here. The ForcedFed tuners are now selling a dry sump solution as long, long fast corners at higher G’s exhaust the accusump too. But you need to be running on a lot more rubber than usual to get into that situation.
i reckon most s2 drivers don’t drive fast enough to ever encounter this problem. Never mind the baffled sump, where are the drink holders?
The drinks we drink while we wait for you boys to catch up??
We don’t carry them. When we get back to the pits we stroll over to the bar and casually ask for one. Then we stroll back and wait for you S1 boys to fix your cars and finally finish the lap…
But seriously, i would very much like to know whats going on in my head (cue another gag!!!) The head of my Toyota engine i mean
So if its a straight lack of pressure, then a baffed sump would do the trick?
I must admit i prefer the baffled sump route as it seems better to stop the oil moving away from the pick up in the first place than to add extra oil when the problem happens. The accusump seems more like a fix for the symptoms instead of curing the patient.
Also the accusump has a weight and so does the oil it carries…all IMO of course.
Not sure where I heard this, but here goes anyway. Is the issue not with the oil draining back from the head to the sump, so if it can’t get back there then the baffles have nothing to contain? I understand that the Moroso sump has more capacity so that there is generally more oil available as well as baffling.
Could all be rubbish, someone will be along in a minute to comment.
the pan carries 1 extra liter
so thats going to help, they quote this also
Additionally, the large capacity and the internal baffling with trap doors keeps a steady supply of oil around the pickup even when you corner on race tires.
Not sure where I heard this, but here goes anyway. Is the issue not with the oil draining back from the head to the sump, so if it can’t get back there then the baffles have nothing to contain? I understand that the Moroso sump has more capacity so that there is generally more oil available as well as baffling.
Could all be rubbish, someone will be along in a minute to comment.
Thats very interesting and would explain what russell meant. It would also explain why Moroso put in extra capacity. Where did you hear this?
I think i am gonna get at least a sump this spring maybe an accusump.
What’s the concensus here as to the best…baffled sump or accusump.
I do know that FF are continually testing with their mods. They told me that at increased G’s there are severe starvation issues. They have used equipment to record pressures at various points in the system. Their track car is approaching 2G in turns. They now make a dry sump and although it says it’s for the Elise it is for both. A friend here is have the 340 kit with a dry sump installed at this moment.
I do remember a comment garnered from Lotus that a baffled oil pan doesn’t help. This makes sense as they could have easily added one. They do sell an Accusump for tracked cars. Nuff said.
It certainly sounds like we need to take care. Also if Lotus said a baffled sump does not help, it would make sense what was said earlier about the sump running out of oil coz it does not come back quick enough from the head. In this respect the moroso would help in that it holds more oil to start with.
If forcedfed do a dry sump kit, then presumably its available through their uk outlet…who is their uk distributor?
So Accusump or Baffled Sump. I’d actually suggest that before spending on either you get a oil pressure gauge and see if you are having any problems.
I fitted the SPA Design dual temp and pressure gauge. It showed that my major problem was oil temp, and that the pressure hasn’t been an issue. Touch wood. My car was an early touring pack car without front mount coolers. I’ve now fitted twin coolers and the temp issues have gone away.
I had been going to get an Accusump as well, but unless the pressure becomes an issue, I think I’ll leave the �600 in the bank.
Also if Lotus said a baffled sump does not help, it would make sense what was said earlier about the sump running out of oil coz it does not come back quick enough from the head.
Has anyone investigated if there is any spare capacity to just “overfill” the sump? It would be a very cheap option.
