Supercharger and breathers
Turbo Mini Forums

Hi guys,

I’ve been reading through some posts on engine breathers on here and other forums and am more confused than when I started to be honest.

I have a Vmax supercharger setup on my spi and the breather from the clutch housing is connected to the air intake which I assume would be the equivalent of connecting it to the carb on a standard or turbo setup which uses a carb.

The gearbox and bottom end were rebuilt around September last year and I now have a consistent oil leak from the area where the drive shafts enter the box/diff housing when the engine is warm. So the first thing I thought to do was to make sure the breathers weren’t blocked and started to read about them.

I have also been having issues with the plugs sooting up but I’m not sure this is related at all and has been considered in a separate thread.

The question really is whether it would be better to hook the breather back up to the intake after I clean it or whether it would be better to stick a breather filter on there and block the hole in the intake/throttle body area.

I know this probably won’t effect the oil leak which will have to be looked at anyway but I would be interested to know what people thought was best.

Thanks in advance and apologies if I have missed the answers when searching.

Chris

I would say vent to atmosphere / catch tank and block the hole, you may well be getting sooted up plugs due to pulling in oil? although there's a difference between 'sooty' and 'oily'..

Here for the craic..

Supercharged Arden powered

i had this problem too and it was coming out of the bottom of the timing cover. i decided to use the crankcase breather and put that onto a t piece with one from the rocker cover and because i am running megajolt, i am using the dizzy hole as a full breather too. all this is plumbed into a catch tank and it seemed to help things

balls to the blower!!!



1330,stage3 head, gt1549, canems ecu, S/C box and drops

Thanks for the replies.

I'm using the emerald ECU but it still uses the spi dizzy.

I also don't have a breather on the rocker cover (apart from the filler cap) but it was something I had considered.

Just wondered whether venting to atmosphere would have an adverse effect on crankcase pressure as I had read elsewhere.

Thanks again

Chris

I've just fixed the same leak on mine following last years castle coombe trackday.
I have vents from the fuel pump take off on the back of the block, the clutch housing and the rocker cover.
I put the leak down to hard driving, there must be a lot of side force on the diff helicle gear.