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Valve cover breathers on 1TB (2013+) smallblocks

M

makarushka

Tuned and Synch'ed
Joined
Mar 13, 2011
Messages
95
Location
Oakland
Talking about the vent hoses going from the valve covers to the airbox... Does anyone know why these are implemented this way in contrast to the earlier, 2TB small blocks? Is it because the earlier ones have a vent elsewhere maybe? Tried to find the answer to this in the parts manuals but it's not obvious.

I am wondering if these can be either capped off or at least re-routed with the idea of not feeding hot air and/or oil into the airbox and the throttle body.
 
Why do you want to re-route?

It has a negligible effect on hp. Even on 60-80 rwhp Sportsters I've seen tested with and without the breather routed to the ac I've seen maybe a 1 hp difference.

And if you're not burning oil, then it has a negligable effect there too.

That said, there's probably no reason you can't route them to a separate breather.

I wouldn't just plug them for obvious reasons.
 
Guzziology talks about the whole airbox-valve cover breather system, and even for them the system is shrouded in mystery. It seems that for the smallblock the system works a reverse path than for the big blocks, if I remember correctly.

I know some have disconnected it with no ill affects, but I say leave it be and let it do it's job.
 
Kev M said:
Why do you want to re-route?
Click to expand...

I would not chase any modifications on a smallblock with just HP in mind, and certainly not something minor like this... I am mostly just curious as to why this would be different in the new models vs. the previous generation. Plus I am obsessed with cleaning up the clutter :) Going to leave them as they are...
 
makarushka said:
Kev M said:
Why do you want to re-route?
Click to expand...

I would not chase any modifications on a smallblock with just HP in mind, and certainly not something minor like this... I am mostly just curious as to why this would be different in the new models vs. the previous generation. Plus I am obsessed with cleaning up the clutter :) Going to leave them as they are...
Click to expand...

I hear ya, and I definitely share some of your curiosity.

I've not looked at the 2TB breather system and only took a few minutes to stare at the parts diagram for the 1TB system. I do wonder how everything is routed. I mean that line and what looks like a check valve going to the oil pan - which way are vapors traveling there - up to the breathers or is that an oil drain back valve back to the pan?

I am curious, but for now it's been falling in the "not broke" category. :lol:
 
It's definitely for emissions. It take the crankcase fumes, that would go out the breather in the old days, to the TB to gone into the combustion chamber to be burned off and caught up in the catastrophic converter. You could plug off the TB connector and just run the tube open to the atmosphere. Actually, doesn't it go to the can first? That generally separates the oil and air sending the air up to the TB. At any rate, removing the can and all can be accomplished easily enough. My last bike just had the breather hose running to the back of the bike. Nothing ever really came out but a light mist that had to be wiped off occasionally..
Bare
 
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