Turbo Conversion - Oil Return/Supply
 

Hi gents, I was wondering what you all might think are good supply and return locations for turbo oil on an SC conversion. I see no reason to deviate from the 930 design on the supply and gather it from the plate the breather ties into, but I wasn't sure about the return. I do plan to use an electric scavenge pump, so gravity feed isn't really a concern. I considered returning back into the breather plate as well, but would that hot oil be supplied back to the turbo, or am I overthinking things?

Thanks for your thoughts!

https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/964984-oil-drain-plug-return-turbo.html

https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/834524-turbo-oil-return-suggestions-please.html

I think the drain plug adapters are the best idea. The electric pump is just more work and cost than necessary.

Thanks! I've definitely looked at that solution, but short of the JWE sump plate (which I don't think is available anymore), it seemed like there was a risk of scraping the sump and knocking the drain off. I'm also wondering whether the turbo would sit higher with a stock exhaust system or aftermarket headers. If there's enough gravity, I think I would give it a try, but reviews seemed mixed.

Feed using a tee where the idiot light switch resides, drain back to the breather cover like this (if planning on using an electric scavenge pump):

http://forums.pelicanparts.com/uploa...1565218031.JPG

You can see how I feed mine here:

http://forums.pelicanparts.com/uploa...1565218219.jpg

Using the existing drain plug is possible as a return location. No need for a pump.

I found someone that made a custom drain cover from the forums here.

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/880468-another-911sc-turbo-conversion-3.html#post8952321


http://forums.pelicanparts.com/uploa...1565220050.jpg

Same here, works great

TurboKraft sells the 930 turbo supply hoses so you can set it up like the 930 stock location.

Thanks, guys! What is the factory feed location for the 930? I know it’s on the top of the case, and I always assumed it was the breather cover, but is it tee’d off the oil pressure switch like the BAE kits?

Based on the price of the banjo bolt I can run to my sump plate (I must have an early 83), I think it would make sense to at least try a gravity drain first. Has anyone installed a check valve to prevent oil from backflowing into the turbo if the car sits? It looks like summit/jegs/etc sell plenty of different AN threaded valves. Any reason not to put one in drain line?

feed pressure comes from the pressure switch area.
https://parts.turbokraft.com/collections/911/products/turbocharger-oil-feed-line-set-3k-warner
You can easily try the drain into...whatever you wanna try but keep your mind open to getting a pump and running back to the tank or better yet the breather cover.

Great, thank you.

I'll definitely keep an open mind. A scavenge pump was a foregone conclusion until I started reading this thread and others. For the cost of a $50 fitting and some AN line, it seems like draining to the sump is worth a try though.

I'd ideally not like to sit and wait for the car to cool down after an on boost run though. Is coking still a concern with modern synthetics changed at regular intervals? This is one area that JWE and other race teams may not have been too concerned with considering what I'm assuming is a relatively short life expectancy on a race engine/turbocharger (a complete assumption on my part).

Synthetic oil has changed a lot of this issue but it'll coke too(needs to be lots hotter though).

Ha ! - the colored balloons are a clever idea. The only drawback for me is, I can imagine my grandkids taking them off and using them for water balloons.

Good idea BTW

It's Perfect