The image I posted was of an NB block.

Here's an MSM block:



They all have the same orifice (or, at least, the same style of orifice.)

 

The cam journals will likely be the first thing to suffer- usually the front of the exhaust cam.

 

You could do the math for how much of the oil flow you are using through the turbo (easier on bb turbos with known restrictor size), and then increase the side of the in block restrictor accordingly.

 

That setup has a 1mm restricter inside that oil feed.

Not going to affect anything at all.

Dann

 

Never judge a cricket bowler until both teams have batted him.

 

You're from America, you can't talk about cricket...

 

that's because we're still waiting for the first ever cricket match ever played in life to finally end so we can analyize it.

 

I wonder why Mazda didn't source the oil feed from the head on all of their turbo engines.

 

touché

 

Coming from a nation that plays baseball...

Test cricket ends, it just takes 5 days Awesome sport.

 

Because they already had a block with oil and water ports they could use. No need to re-invent the wheel. Just cause they didn't do it doesn't mean its bad, but I too would feel kinda nervous sourcing from the head when there's a restrictor to it from the block as Joe pointed out. Something about possible slight oil starvation that could rear its ugly head a long time down the road makes me nervous.

 

Ok so the flow through your average turbo restrictor with a -4an feed line and 0.065" restrictor running 10w40 is 0.0627 lb/min. Can someone get me a measurement of that restrictor in the block as well as the side of the passage it feeds into?

 

V8 Supercar quote, lol.

 

That seems like an overly broad statement.

Upon what temperature and differential pressure did you base this calculation? What was the delta-P across the "average" turbo (and was it ball-bearing or journal-bearing?)

 

That would be a generic ball bearing turbo, assuming idle pressure of 30psi reaching the inlet and near zero psi where the drain returns to the sump. At 230 f oil temp.