Dry Sump R8 > RS4

B6/7 S4/RS4
#1

So with a fella over on AZ putting an R8 block in his RS4, it confirms quite a few things about the similarities between the two blocks. So the immediate question that comes to mind is, can the dry sump system from the R8 be adapted to the RS4? There will need to be some creative fabrication to get the oil tank to fit. It would be great to adapt the R8 can, since it already has the oil level/temp sensor provisions and the OE feel. It looks like the oil pump for the dry sump system feeds off the same gear. The R8 does have the front axle shaft running through the lower bed plate, my guess would be those shaft bearings can be blocked/capped off.

What I’ll need from the R8:
Everything from the lower bed plate assemblies
Oil & Water pump assemblies
Oil tank
Oil pressure/regulator valves?

Aftermarket:
External oil thermostat
Plumbing

The AC compressor looks to be the same, but I haven’t checked the part number. I reached out to Suly on AZ to see if I can purchase all the swapped over R8 parts, but haven’t heard back.

I’m looking for you guys to shoot holes in this idea…what am i forgetting? Why wouldn’t this work?

Here’s a link to the R8 V10 study guide for reference, they look at the oiling system on pg12-16. (if someone can find the R8 V8 guide, please let me know) http://www.vaglinks.com/vaglinks_com/docs/ssp/VWUSA.COM_SSP_990193_2009-10%20Audi%20New%20Technology.pdf

#2

[quote=“koolade9,post:1,topic:8896”]
page 17 has a little bit:
http://maben.homeip.net/static/auto/audi/SSP%20997B703%20Audi%20R8%20self%20study%20program.pdf

#3

Who is doing that and why? Would seem a long shot to get a good deal on an R8 engine…

#4

This fella: http://www.audizine.com/forum/showthread.php/672692-What-did-you-do-to-your-B7-RS4-today?p=11734090&viewfull=1#post11734090

The motor is already in his car and running.

#5

Forgive my newbness on the technical side, but what would be the benefit of running dry sump system from R8 on RS4?

#6

I would think that the engine keeps oil flow under extreme cornering like on a road course. Maybe better cooling too but that one is debatable until proven.

#7

Yeah, I would think it would be more prudent to just add some custom baffling and a better cooling system to the current motor.

#8

Oil cooling I meant.

#9

Bear in mind the RS4 BNS wet sump has fancy-dan baffling already, which is why we can’t use an oil extractor pump to change our oil.

Oil cooling and capacity would be the primary benefits that come to mind for me, although there are others far more knowledgeable on here than me that could offer better insight.

#10

Usually dry sumps are used for 1) better engine reliability in constant oil pressure 2) allows use of a shallow pan and give you ability to lower the engine in the chassis 3) reduces oil slosh which can increase horsepower because of less drag 4) cooler oil

Generally in a racing application, the forces in accel/decel and lateral g’s will overcome the best wet sump systems

#11

koolade9 great work with Suly’s ride! I was wondering who was doing the work, because Suly didn’t say much about it on AZ. One day the long block was toast and 3 posts later he’s back on the track LOL.

Good job! Any info on retrofitting the dry-sump to the B7 chassis?

Ps: Doesn’t the R8 oil system also have gravity controlled chambers that close under high lateral force? In practice, when you go in a long corner and press the oil to one side of the engine these chambers close and force the oil to stay evenly spread.

#12

Any chance you can post your information and thoughts about all this over here. I would love to read it.

#13

[quote=“justincredible,post:12,topic:8896”]
I apologize, I didn’t mean to cause any confusion. I didn’t do any of the work on Suly’s car. He posted up that he was using an R8 block and that the shop was swapping over the lower bed plates from his RS4 motor. That’s when I reached out to him for more info and started this thread shortly after. I’m going to try reaching out to the shop to see if they’ll talk with me about it a bit.

I brought the topic here because we’ve got some smart people amongst us. I’m not really looking for the ‘anything is possible with money’ answer. Regardless of the route I go to swap over the R8 oil system bits, it’s still not going to be cheap. I’m looking for show-stoppers, reasons it won’t work before I start walking down that path. I wouldn’t even start turning wrenches until q1 of next year so it’s not urgent. Just doing my research.

The bits I’m really worried about are the timing chain components on the R8 oil pan, and if there are any differences in trans mounting points.

For those who asked ‘why’. Without going into all the details, I’m already running a massive oil cooler and eliminated the oil cooler block. I didn’t touch the thermostat in the lower oil pan. However, that doesn’t change the fact that oil temps when shifting at 7k are 30-40degF lower than shifting in the 8s. I’ve got a friend with an R8 4.2 that tracks his car regularly and his oil temp behavior is much different. The RS5 and subsequent RS4 motors have a variable oil pump…they must’ve done it for a reason.

#14

Thats what I thought but only some of the early build cars have that. 2008 in general didn’t.

#15

How did this project make out?

#16

Haven’t started