2.5 conversion question

just thinking ahead, wot do people do with the extra breather from the 2.5 when going into a classic? all my breathers are to air or tank,

do i tap it into another breather to tank?

block it?

or can i use it as a return?

some block it, some vent it, some "can it"

no idea what is happening with mine tbh, never even thought about it!

Originally Posted by old bob

just thinking ahead, wot do people do with the extra breather from the 2.5 when going into a classic? all my breathers are to air or tank,

do i tap it into another breather to tank?

block it?

or can i use it as a return?

mine was blocked off when fitted to my 93 wrx

mmm was hoping people didnt say block it, kinda think well it must have been put there for a reason so i best use it

No need to follow suit As you say it's there for a reason and it will only aid crank case venting. By default 2.5 will generate more crank case compression than that of a 2lt.

You could always 't' the two crank breathers together,but don't see the point,i didn't,and never heard of any reasons not to?

When I first did mine I T'ed the two breathers and found my catch can filling up very quickly, with the center one blocked catch can stays empty.

The pipe is normally connected to the cam covers with the additional vent pipes, so any gas vented from it is passed round the engine and then out of the normal breathers.

Originally Posted by SSCJAY

When I first did mine I T'ed the two breathers and found my catch can filling up very quickly, with the center one blocked catch can stays empty.

The pipe is normally connected to the cam covers with the additional vent pipes, so any gas vented from it is passed round the engine and then out of the normal breathers.

in that case then wot im thinking is block the normal one off and use the extra one as breather as it has a more central location across the block!

Dont do that , the centre breather is directly above the crank and is very easy for oil to pass out of it. The main crank vent has a baffled plate on the rear of the block which helps stop this from happening.

buy a catch can with 4 inlets, an outlet to vent pressure at the top and a drain underneath.
job jobbed as they say

As SSCJAY said - you get a lot of oil splash from the crank going up through the block breather - the originals on the EJ257 connect up to the cam covers,but most people blank the breather off.

Mick

Mine blocked off.