Cosworth Sump Baffles
#182
Hang on a minute ... all the information is related to oil surge, which is what the sump baffle is supposed to fix and is therefore very relevent. I think the info posted by JohnF is very interesting and useful to any of us who will be pushing our cars power in the future. It's of course completely your choice whether you decide to follow that advice or not.
I find it amazing that so many people on SN offer advice (often with very little relevent knowledge), but when an expert like John comes on here and gives us advice based on his many years of experience you effectively say his advice is not welcome.
No wonder a lot of the experts can't be bothered to post here any more.
I find it amazing that so many people on SN offer advice (often with very little relevent knowledge), but when an expert like John comes on here and gives us advice based on his many years of experience you effectively say his advice is not welcome.
No wonder a lot of the experts can't be bothered to post here any more.
#183
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We have also just built a Type-25 with the Cosworth oil baffle plate installed which supports Eric’s finding.
Car:
MY07 Subaru Impreza STI with narrow sump.
Engine:
Type-25 Cosworth Long engine
Cosworh Subaru (ej20/ej25) oil control baffle
Silkolene pro s 10w/50 fully synthetic oil
Cosworth baffle oil pressure readings.
Water temp degrees c >>>> oil pressure x100kpa >>>> engine rpm
20.. 5.9 1500
30.. 5.9 1500
40.. 5.9 1500
50.. 5.9 1300
60.. 5.9 1100
70.. 5.9 880
80.. 5.4 800
90.. 3.9 800
95.. 3.2 800
96.. 3.0 800
Fans cut in
93.. 2.7 800
95.. 2.6 800
Fans in and out
93-96.. After 20 mins idle >>>> 2.3 @ 800 and stabilised.
Hot rpm held 3000 >>>> 5.9 and stable
Return to idle after 1 min >>>> 2.0 @ 800
Dyno run with oil temperature probe.
Oil temp 85 degrees C, oil pressure 5.9 @ 3000
Oil temp 79 degrees C, oil pressure 2.0 @ 800
I think it is safe to say that this Oil Baffle plate has no the effect on oil pressure we usually see on engines fitted with the Narrow sump
Iain
Car:
MY07 Subaru Impreza STI with narrow sump.
Engine:
Type-25 Cosworth Long engine
Cosworh Subaru (ej20/ej25) oil control baffle
Silkolene pro s 10w/50 fully synthetic oil
Cosworth baffle oil pressure readings.
Water temp degrees c >>>> oil pressure x100kpa >>>> engine rpm
20.. 5.9 1500
30.. 5.9 1500
40.. 5.9 1500
50.. 5.9 1300
60.. 5.9 1100
70.. 5.9 880
80.. 5.4 800
90.. 3.9 800
95.. 3.2 800
96.. 3.0 800
Fans cut in
93.. 2.7 800
95.. 2.6 800
Fans in and out
93-96.. After 20 mins idle >>>> 2.3 @ 800 and stabilised.
Hot rpm held 3000 >>>> 5.9 and stable
Return to idle after 1 min >>>> 2.0 @ 800
Dyno run with oil temperature probe.
Oil temp 85 degrees C, oil pressure 5.9 @ 3000
Oil temp 79 degrees C, oil pressure 2.0 @ 800
I think it is safe to say that this Oil Baffle plate has no the effect on oil pressure we usually see on engines fitted with the Narrow sump
Iain
#185
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Some good data there Iain
So WTF was going on with the car that had a problem
I was planning to fit one of these so it would be good to know what the issue was ?
So WTF was going on with the car that had a problem
I was planning to fit one of these so it would be good to know what the issue was ?
#188
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Originally Posted by LitchfieldImports
We have also just built a Type-25 with the Cosworth oil baffle plate installed which supports Eric’s finding.
I think it is safe to say that this Oil Baffle plate has no the effect on oil pressure we usually see on engines fitted with the Narrow sump
Iain
I think it is safe to say that this Oil Baffle plate has no the effect on oil pressure we usually see on engines fitted with the Narrow sump
Iain
In all fairness, Iain that's not what it shows though is it.
It only shows that it didn't react the same way as the one we fitted it to (twice, with identical low pressure results, which cleared back to "normal" as soon as it was removed)?
Unfortunately we didn't get a chance to look at it in any greater depth as we would have loved to have done as the customer wanted his car back to prepare for Time Attack, I'm sure that Cosworth will be pursuing this matter which has been acknowledged by them as "not a build problem" until they've determined what the actual cause was?
Mike.
#190
Thanks Iain.
It would be very useful to monitor the oil level, that will show you if there is a restriction problem better than oil presure.
A Bench dyno would allow checking for oil level far easier than doing it in the car. Has Cosworth done some bench dyno testing and monitored the effect on oil level?
It would be very useful to monitor the oil level, that will show you if there is a restriction problem better than oil presure.
A Bench dyno would allow checking for oil level far easier than doing it in the car. Has Cosworth done some bench dyno testing and monitored the effect on oil level?
#191
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Oil pressure remained consistant all the way to the Cosworth 2.5's 8,100rpm redline and on extended road test
I would image Cosworth's pressure figures came from the MY08 2.5 engine they are currently have out for dyno testing but would need to check.
Iain
I would image Cosworth's pressure figures came from the MY08 2.5 engine they are currently have out for dyno testing but would need to check.
Iain
#193
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Our data entirely supports that found by our good buddies at Litchfields. We've had a 2 litre STi8 running around quite happily on 450 bhp since it was fitted.
We have three more cars to go very soon with Cosworth baffles, and we don't expect any problems.
We have three more cars to go very soon with Cosworth baffles, and we don't expect any problems.
#195
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A common sense measure at any time of course!
Personally, I don't think we'll ever know the answer to that one. We just can't replicate what happened to D's car, and so far, neither has anyone else.
Personally, I don't think we'll ever know the answer to that one. We just can't replicate what happened to D's car, and so far, neither has anyone else.
#196
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Whipped the sump off today to do some baffling but found a small crack in the oilpipe that may have been opened up more by the cosworth tray.
It does look like a design fault in the pipe as i have heard of another splitting.
I am going to re-fit the Cosworth tray tomorrow and will report back
#199
Iain,
As a matter of interest is this Cosworth plate a much cheaper version of the PowerStation Baffled sump on my car (as regards to what it does).... or is the PowerStation baffled sump solution still the best bet for hardcore track attack (not that I would know of course lol)?
As a matter of interest is this Cosworth plate a much cheaper version of the PowerStation Baffled sump on my car (as regards to what it does).... or is the PowerStation baffled sump solution still the best bet for hardcore track attack (not that I would know of course lol)?
#203
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I think it explains a lot - although it is such a random fault (i have only every heard of one splitting and that was on an 06 car too).
The funny thing was... the choice was either to:
- lift the engine up 2 inches so undoing the engine mounts, finding a hoist and listing engine so that the sump would clear the pick up pipe, or
- remove 3 x 10mm bolts to remove the pickup pipe.
Good job I am lazy
The funny thing was... the choice was either to:
- lift the engine up 2 inches so undoing the engine mounts, finding a hoist and listing engine so that the sump would clear the pick up pipe, or
- remove 3 x 10mm bolts to remove the pickup pipe.
Good job I am lazy
#204
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Strangely someone I know (06 STI) has just had a new engine supplied and fitted from Subaru,after experiencing the same problem... (No Cossie bit tho'.)
Duncan
Duncan
#205
I think I may have found the reason for my lack of oil pressure with it.
Whipped the sump off today to do some baffling but found a small crack in the oilpipe that may have been opened up more by the cosworth tray.
It does look like a design fault in the pipe as i have heard of another splitting.
I am going to re-fit the Cosworth tray tomorrow and will report back
Whipped the sump off today to do some baffling but found a small crack in the oilpipe that may have been opened up more by the cosworth tray.
It does look like a design fault in the pipe as i have heard of another splitting.
I am going to re-fit the Cosworth tray tomorrow and will report back
You are very lucky, not much more running and that would have failed completely. That would certainly cause issue you had if the crack was in free air and not under the oil level.
#206
Iain,
As a matter of interest is this Cosworth plate a much cheaper version of the PowerStation Baffled sump on my car (as regards to what it does).... or is the PowerStation baffled sump solution still the best bet for hardcore track attack (not that I would know of course lol)?
As a matter of interest is this Cosworth plate a much cheaper version of the PowerStation Baffled sump on my car (as regards to what it does).... or is the PowerStation baffled sump solution still the best bet for hardcore track attack (not that I would know of course lol)?
The cosworth plate is a half way there solution, as it does nothing to improve the oil flow around the oil pickup, in fact it's introducing a restriction in the path the oil has to travel to get to the pickup, small as that restriction should be, but it's there, a good baffled sump directs the oil to the pickup by an unrestricted path.
It should improve some of the more severe surge issues but it's not a substitute for a well designed baffled sump IMHO.
#207
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If you think that's a small crack you'd be very popular at a weight watchers convention.
You are very lucky, not much more running and that would have failed completely. That would certainly cause issue you had if the crack was in free air and not under the oil level.
You are very lucky, not much more running and that would have failed completely. That would certainly cause issue you had if the crack was in free air and not under the oil level.
Lucky is my middle name at the moment
Once I have tested the repaired pipe and the tray combined in normal running and assuming it is fine during this, it will be very easy to compare a before and after effect of the tray at preventing surge/sloshing. I will of course post the full results here. If it works well then I will be the first to say - 'well done cosworth'
#210
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Well, that's answered that one then!
Credit to Duncan for the discovery and admission.
Credit to Duncan for the discovery and admission.