Sump buffles

[x6rs]

just put in a acuusump and youll have no problems! thats what i did on my urquattro works a treat

[Billman]

i think the pan baffles are easy to install and cheap. I have searched accusump but didnt find where to connect it on the I5 (+it adds one thing more in this tight space)

[S2central.net]

The S2 sump is nicely baffled already from factory - well compared to some other engines I have seen with hardly any thought to this at all. I like the extra baffles on the pic of that mod done by JP - seems to be enuff. I think these hingey things look a bit hokey.

[Thuppu]

No problem so far with this

[S2central.net]

<campmode>

"shut that door"

</campmode>

[Audi_CQ]

i think the pan baffles are easy to install and cheap. I have searched accusump but didnt find where to connect it on the I5 (+it adds one thing more in this tight space)

Easy fitting of accusump on I5: Bore out the large bolt that hold the filter housing and weld on a fitting on bolt head. Connect Accusump to fitting

[A1QSHIP]

The S2 sump is nicely baffled already from factory - well compared to some other engines I have seen with hardly any thought to this at all. I like the extra baffles on the pic of that mod done by JP - seems to be enuff. I think these hingey things look a bit hokey.

Hokey it may look but road racers with wet sumps have been doing it for over 50 years. Think LeMans & the GT40 Fords & the Duntov Corvettes of yesteryear. They would also kick out the sides of the oil pan for increased capacity & have hinged baffels for the sides. My fathers '63 factory lightweight Dodge Polara drag race car had a baffeled oil pan made to prevent oil starvation.

The 5 cylinder engine crankcase ventilation issue stems from the fact that the crankcase acts as a positive displacement pump i.e. there are no corresponding evenly timed upwards movement of the bottom side of one piston to balance out the downward movement of another. This is not as much of a problem with even numbered cylinder engines that will always have one cylinder going up as another is moving downwards.
Optimal situation is a dry sump system. Properly designed there would be a vacuum on the crankcase which would aid in pulling oil off the spinning crankshaft & off the cylinder walls. Dry sump systems also aid in ring seal as it tends to draw the rings against the cylinder walls.

Here are pics of some different ideas for 5 cyl pans.

[A80Avant]

good info and nice photos!

what is really not entirely clear to me is when are these baffles really doing most of the work? Say you have a nicely bolted down engine(2 bottom mounts and the front one), thus allowing as minimal movement as possible. You have a hard acceleration in any gear besides 1st. Would you have any issues there? Noticed above that you can get as much as 45deg movement at hard accel., but i find that a bit hard to believe if all of the above exist.

Then hard cornering. Is that going on an uphill? track only?

where do have people mostly witnessed this drop in oil pressure?

Furthermore i have always been told that when you are not using a BB turbo, where the oil feed to the turbo is wider without restrictor, there is always a chance of having a minor drop in pressure because of that feed. Could this be a problem only on cars that run thrust bearing turbos, and less of a problem on BB turbos,where the restrictor is not causing too much of an issue with oil pressure in itself?

Finally, if you use a catch tank system for the crankcase ventilation which utilises vaccum on all instances (ie both inlet manifold and turbocharger itself) does this aid to the process of reducing the risk of oil starvation?

[x6rs]

Easy fitting of accusump on I5: Bore out the large bolt that hold the filter housing and weld on a fitting on bolt head. Connect Accusump to fitting

exactly how i did it. as for making room for it, i have mine in the trunk.

[Audi_CQ]

good info and nice photos!

what is really not entirely clear to me is when are these baffles really doing most of the work? Say you have a nicely bolted down engine(2 bottom mounts and the front one), thus allowing as minimal movement as possible. You have a hard acceleration in any gear besides 1st. Would you have any issues there? Noticed above that you can get as much as 45deg movement at hard accel., but i find that a bit hard to believe if all of the above exist.

Then hard cornering. Is that going on an uphill? track only?

where do have people mostly witnessed this drop in oil pressure?

Furthermore i have always been told that when you are not using a BB turbo, where the oil feed to the turbo is wider without restrictor, there is always a chance of having a minor drop in pressure because of that feed. Could this be a problem only on cars that run thrust bearing turbos, and less of a problem on BB turbos,where the restrictor is not causing too much of an issue with oil pressure in itself?

Finally, if you use a catch tank system for the crankcase ventilation which utilises vaccum on all instances (ie both inlet manifold and turbocharger itself) does this aid to the process of reducing the risk of oil starvation?

It's the g-force that's causing the starvation, not engine movement. If you have enough power you'll loose oil pressure when accelrating in 3. and even 4. gear. Accelrating uphill makes matters worse as gravity and g-force(it's the same thing really ) work together pushing oil backwards away from the pickup.
With enough grip you'll loose it in corners too.
Mine was (nearly) OK until I switched to E85 and slicks, then it was game over for the oil pressure and AccuSump had to be fitted for track use.

Turbo feed isn't a problem.

Catch tank doesn't help for oil starvation, only keeps the oil from coming out where it shouldn't.

[Audi_CQ]

exactly how i did it. as for making room for it, i have mine in the trunk.

I mounted it like this:

[gnutz2]

It's the g-force that's causing the starvation, not engine movement. If you have enough power you'll loose oil pressure when accelrating in 3. and even 4. gear. Accelrating uphill makes matters worse as gravity and g-force(it's the same thing really ) work together pushing oil backwards away from the pickup.
With enough grip you'll loose it in corners too.
Mine was (nearly) OK until I switched to E85 and slicks, then it was game over for the oil pressure and AccuSump had to be fitted for track use.

Turbo feed isn't a problem.

Catch tank doesn't help for oil starvation, only keeps the oil from coming out where it shouldn't.

I Agree ^^^^^ its allways happend in a straight line with me but i do go drag racing.

Under hard acceleration the top end of my engine would rattle like crazy and engine would take a few minutes to recover at normal speeds, god knows what would happen if i just carried on at WOT. The baffles and check flaps stopped this overnight.

The standard sump is just not good enough for the job if your cornering hard or doing hard launches. Baffles, accusump or drysump are essential on a high powerd i5.

[A80Avant]

good points!

[Thuppu]

According to Repo, you can also get oilpressure drop on a high revving(8000+rpm) engine because you sump is starving, all oil is in the head. The oil pump forces the oil up faster than it's coming back down.

[Jamo]

100% Thuppu I believe this is why he does his oil feed modifications, more details available from Repo