My Proposed Breather Setup For My High Compression Solid Block Mi16

[maxi 36 1 Cars]

As most of you are aware I have been having major breather issues with my mi16. Just to refresh your memories its an XU9J4 (Early 1900 mi) head mated to a XU10J4 (2.0S16/Mi) solid block. Running 528 Catcams (11.5mm lift) and a compression ratio of 11.5:1 (warm compression test revealed 245PSI across the board). Anyway, at the moment its running an S16 filler pot as a breather /filler tank with 2 crankcase breathers connected to it and the smaller outputs on the pot venting to air. The camcover breather returns back to a small union in the front of the block.

 

Here is a diagram (had sooooo much fun drawing this! ) of what I propose to do:

 

 

The idea is basically to have a baileys tank( already acquired from a fiesta Turbo) to catch all the breathers and have them located in the postions shown. I then plan to get a few more LARGE unions tig'd on high up the tank to give a lot of ventilation. This however poses me the problem of trying to fill the engine with oil, first idea that was suggested to me was to have a filler cap in the rocker. I however, prefer the idea of keeping the S16 filler pot as well and linking it to the redundant oil level sensor hole in the back of the block. This will then give a decent filler as well as possibly more crankcase ventilation as the smaller outputs towards the top of the pot will still be open as a vent.

 

The only thing I am slightly concerned about is the fact the filler will now be at the back of the sump the other side of the baffle although I think the oil will still flow itself around the whole sump without being contained in just one side (I have done a section drawing of the sump at the top left of the diagram, 'X' marks the spot of where the new filler will be).

 

What do you reckon guys??

 

Maxi

Edited January 23, 2006 by maxi

[maxi 36 1 Cars]

No comments?? Even on my sexy drawing skills???

 

Maxi

[jackherer 543]

I find the lack of detail on the rocker cover deeply dissappointing

[pug_ham 244 3 Cars]

I'm not 100% certain but I think stew has already done a very similar set up on his engine except for the seperate filler tank. Only problemn I can see is that if this doesn't work then you are spraying the oil out of the catch tank over the engine bay which stew has had problems with on his.

 

I know stew has tapped into the catch tank & run a pipe from there to the block using the old oil level sensor hole as a return from the catch tank though as we talked about it at Donington last November & he did this before Cadwell.

 

Do you know if Stew has spoken to Martin (crf450) because last time I spoke to Martin & we mentioned this he said the cure was simple but nothing more.

 

Graham.

[maxi 36 1 Cars]

I'm not 100% certain but I think stew has already done a very similar set up on his engine except for the seperate filler tank. Only problemn I can see is that if this doesn't work then you are spraying the oil out of the catch tank over the engine bay which stew has had problems with on his.

 

I know stew has tapped into the catch tank & run a pipe from there to the block using the old oil level sensor hole as a return from the catch tank though as we talked about it at Donington last November & he did this before Cadwell.

 

Do you know if Stew has spoken to Martin (crf450) because last time I spoke to Martin & we mentioned this he said the cure was simple but nothing more.

 

Graham.

 

 

Graham, I spoke to stew about it the other day. He is now using the level hole as a return from the catch tank. I personally think as long as their is a baffle in the catch tank it shouldnt chuck too much oil of it in the first place. If I do have a problem of it ejaculating all over my engine bay I will drain the outputs down to te ground like the cossie boys do.

 

Maxi

[Sam 4]

All good but don't drain it to the sump, you'll end with nicely watered down oil in no time. Quick way to ruin your engine.

[stew205 17]

Yes, as you said Maxi and Graham I now have a return back to the oil level sensor hole.

 

My problem before this was the catch tank half filling with oil over a session on track.

 

I then welded the retrun pipe to the base of the catch tank back down to this sensor hole but when tank was filling with oil, instead of it just running back down this pipe it was acting as an extra breather and spirting over my engine bay Should have seen it coming I now have a oneway valve for this pipe, I wil let you know the results.

 

Just for the record though I took my car out Saturday and was reving it hard, round islands ect.. and didn't get any oil out the breather. It only seems to occur on track where I surpose you push it a bit harder I reckon its under hard breaking where the oil runs up the front of the block and then can be blown out the two breathers at the base of the block (see maxi diagram ).

 

You will still get a bit of oil out your two breather filters though as when the engine is breathing the air that is moving about is all oily Well thats what I reckon anyway.

[maxi 36 1 Cars]

see maxi diagram

 

 

Fingers crossed this will sort it. I will get fabricating the catch tank ASAP.

 

Maxi

[Sam 4]

 

Your call. I didn't loose any water, just gained it....

[maxi 36 1 Cars]

 

Your call. I didn't loose any water, just gained it....

 

 

f***ing arseholes!!!

 

That is some serious water!! How long did it take to build that up Sam???

 

Maxi

[Sam 4]

It was probably a few months worth. I guess its going to be different on a track only car but I assume yours is a road car too, its condensation building up obviously.

 

Heres my layout...

 

The pipe from the rocker cover goes to the catch tank, then a pipe from catch tank to the floor... Its an aluminium 1L mocal one...

 

[maxi 36 1 Cars]

It was probably a few months worth. I guess its going to be different on a track only car but I assume yours is a road car too, its condensation building up obviously.

 

Heres my layout...

 

The pipe from the rocker cover goes to the catch tank, then a pipe from catch tank to the floor... Its an aluminium 1L mocal one...

 

 

 

The joys of simple TU's!!! Bloody XU with their 5o million breather unions! if your catch tank drains to the floor, how come you managed to collect a months worth of output??

 

Maxi

[Sam 4]

Well its doing its job as a catch tank (for the oil). The water (I assume) is condensation forming on the inside.

[Jonmurgie 2]

Interesting topic... I'm fitting a catch tank to mine due to the TB's. This is how I was going to have mine:

 

Rocker Cover Vent to catch tank

Oil Filler Cap Vent to catch tank

 

All the other pipes are running as standard...

 

Am I likely to get problems there then?

[maxi 36 1 Cars]

Is it otherwise a std engine jon?? if it is you might be ok. Mine is running a lot higher compression which is adding to the problem!

 

Maxi

[Martin@PRD 0]

From looking at the diagram you sketched there maxi, it seams to me that using the main filler neck as the drain back is coursing the oil to cover the engine bay, due to the larger bore it is more subject to pulses from the crank casing hence why its throwing it back out the tank, this is the same with the std breather set-up on a mi16 with carbs.

 

The main filler (I my eyes) should only be used for filling the engine with oil, the top breather (cam cover) links to the oil catch tank and then back to bottom of block. Heavier tuned engine may require the extra outlet on main filler neck to link to the catch tank though I didnt experance any problem with the set-up below when pushing 250+ bhp

 

http://img.photobucket.com/albums/v728/tom...eathersetup.jpg

 

Sam is right about the drain back, because of the changes of humidity in this country the reason people use the tank is to trap water and so it can be emptied after each session/event.

 

Now Im sure there are other ways the catch tank can be set-up though I thought to post, as I didnt have any problems with the way I did it.

 

I hope you sort it out.

 

Martin

[pdd144c 0]

All good but don't drain it to the sump, you'll end with nicely watered down oil in no time. Quick way to ruin your engine.

 

Had no problems with mine Sam.

[Sam 4]

Well, its better safe than sorry. Worth the risk to empty it now and then and top up with fresh oil?

[Jonmurgie 2]

Is it otherwise a std engine jon?? if it is you might be ok. Mine is running a lot higher compression which is adding to the problem!

 

Maxi

 

At the moment, yes it's an otherwise standard engine... I guess I will have to revise the system when my new engine goes in though.