HELP ADVICE NEEDED !! breathers / systems on 998
Turbo Mini Forums

my lads 998 mini have problem with breathing we have a breather on flywheel housing going into rocker cover and a y piece gointo timing chain cover with a big k&n breather on a catch tank !!!! rite or rong ?? any ideas or pics thanks

is the breather from the flywheel housing and rocker cover going to the catch tank or are they just connected to each other?

Have you cleaned the filter, not sure but I think they can be washed out.. Alan

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Difficult to understand exactly how they are connected from the description. But I'll assume that the three pipes basically link together then go to the catchtank.

The catchtank I assume has a breather on an it's this that seems to be breathing heavily, right?

In which case I'd say the engine is the problem not the breathing system. fooked rings, ringlands, knackered pistons, worn bores. or all of the above.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

As Wil says it does sound like the engine is the problem rather than the breather system.

You could try blanking off the rocker cover and connecting the flywheel cover and timing chain cover through the T piece into the carb as per standard

I seriously doubt it!

are you getting any smoke or vapour from the breathers

Done now needs redoing lol

Hmm, sounds odd for a 998, they normally only have one breather on the tappet chest cover going to the carb. The timing cover and transfer case breathers are generally found on large bore engines. Unless the 998 in question isn't standard.

hi yea all connected to 1, and catch tank is 5" dia and 7" tall and has a 30mm pipe and k&n on it thanks

yea pipe from housing going to pipe of rocker cover then large catch tank , engine rebored new pistons still same !! thanks

Has it been run in?

In the 13's at last!.. Just

How bad is bad then?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

hi yea ran in on track low rpm 4th gear fair bit of load bout 60 laps slowing down stop starts then nother 30 laps then to rollers wer it had more running before power run started ,it dont smoke out of breathers its preasure and pushes dip stick out, and if undo filler cap and leave it on top it will push cap up on its own, it did this before rebuild but breathed bit smoke then as well , im lost !!!

ah just had a thought !! when been rebuilt we put in a windage tray could this do it ????

The windage tray wont affect anything. Lots of us have a spring on the dipstick to stop it blowing out. Is that your only concern?

I seriously doubt it!

Or try a new rubber 'O' ring on the dipstick so it's a tightish fit.
The anodized dipsticks you can buy are good, they have two.

Edited by Carlzilla on 5th Apr, 2013.

yea just cocernd how much preasure ther is way way to much thanks

check the breathers all again!!! and the k&n is it big enough on full power ?, if its burning oil and blowing out of the breathers, you can bet sadley the rings are goose,

if the breathers checks out ok? & its not burning oil my monies on the second ring down on one or two of the pistons is cracked .............. but i may add that more than likley the ring lad has collapsed on the second one down cause by detonation, my monies on number 4 cylinder

hope this helps
please keep us posted

Edited by BENROSS on 6th Apr, 2013.

when my 998 had breathing problems or i should say started pumping out out from every where i had melted pistons hope yours aint that bad

Done now needs redoing lol