In the same way the combustion pressure pushes the rings against the cylinder walls, the vacuum pulls the rings to the walls during intake stroke, and increases VE. Supposedly.

Dann

Dont send it directly back to the sump. Part of the job of the crank case vent is to evacuate combustion acids, gasoline, and water from the oil. Most of those are vapors at operating temp, but a good bit of them will cool down to a liquid and get left in the catch can. These are things you dont want going back into the crank case. If you REALLY want it to auto drain I would put a coolant loop through the liquid in the catch can to keep it above 180*F and put a restrictor in the drain line so it takes a long time for the can to drain. Otherwise just make it easy to take out and drain into the waste oil bucket.

So far with the keywords i'm using this is the only site with dynos i've found. Motorcycle dyno testing...

Red is stock.

Blue is with vacuum source applied to the breather hose.

Green is with it just flowing out to the atmo.

https://www.miataturbo.net/attachmen...ine=1376493416

hmm so we're talking 1 or less hp. Noticeable is an overstatement, but looks like there might be at least some merit to doing this

On a tiny 2 cyl 600cc motor yes.

This is supposedly a big part of why dry sumps make more power also.

Ok, so if miataturbo can collectively design a catch can setup Ill build it and run it on a customers car, lucky bastard.

Obviously Ill post results.

And then everyone will say I faked them of course.

Dann

Looks like between 1 and 2% and we have no idea what amount of vac we are talking about.

Thats 5hp on a serious BP. Which also likely has way worse ring seal than a tiny n/a bike, so could be more.

Dann

Thats a 2 pop 600 making 85hp stock? I guess that seems reasonable, just remember that compared to cars sport bike engines are basically full out 10 hour race engines, they only last longer because the smaller size reduces the forces.

Google images is your friend.

Also if you stopped whining about people calling your bs dyno's long enough to actually get legitimate results we'd like you a whole lot more on here.

Drove it yesterday, came from the dyno retune for spool with a hair under 500tq.
Eat a dick :fawk:
Shreds 5th gear with 18" reemz. I dont need your approval.


So catch cans.

I dont want photos of cylinders with pipes in them , I meant internal design, where the hoses go, how the baffles look etc.

I'll do it all and post results and everyone gets a bit smarter. :party:

Dann

I think there are plenty of us that like Dann just fine now. I am not saying he is Jesus but I enjoy his enthusiasm to try things and the fact that he will then produce write up and share with the community. He may not have done anything revolutionary but he provides good documentation and pictures to help guide others through the process.

Keep at it Dann, I enjoy your posts and silently soak up as much info as I can even if you posted a wonky looking dyno.

Thankyou Ryan. I know people appreciate it because I would have not too long ago.

The main upshot I have is that my time is worth fuck all to anyone and there are plenty of enthusiastic people who want to try shit out, so in the process of making a buck and building parts I can learn by doing, and teach by documenting. I enjoy it.

Anyways, This is my plan so far,
Fit catch can in this location, using oem weld nuts to secure it.

https://www.miataturbo.net/attachmen...ine=1376494701

I want to run 2x1/2" hoses into it, It seems one from the OEM hotside and another from the rear of the hotside, other one blocked somehow (welded I spose).

One outlet on the bottom, the MSM drips straight back to the sump but perhaps that isnt ideal.

And one outlet on the other side of a baffle to a slash cut on the downpipe.

But Im concerned about the fitting welded to the exhaust getting very hot and damaging the rubber hose which connects it to the catch can.

Dann

Why not build a cover for the header and eliminate 2 problems with 1 stone?

If you mean for the car above, well to start Im in Australia and that car is in america, also it belongs to Emilio and he probably doesnt want some teenagers grubby hands all over it. :fael:

Dann

EDIT: Now I cannot post again for weeks, until the awesome seen here wears off, fuck.

https://www.miataturbo.net/attachmen...ine=1376496984

http://upload.wikimedia.org/wikipedi...ol-hacksaw.jpg

Yeah i thought it looked familiar.

This design looks pretty good:
Saikou Michi OCC Explanation

The customer has agreed to my terms which include dyno testing this setup with the slash cut fitted and slash free back to back.

Im pretty sure this will suffice.

https://www.miataturbo.net/attachmen...ine=1376692330

Anyone?

Probably around a quart. maybe 2.

1/2" hoses.

Dann

I would put the hotsides on the bottom corner by the sump. Also would make it more vertical.

why on the bottom?