what size hose to breather tanks

running a bbc with 12-71 at 20% OD..got a set of polished burn-down breathers w/screw in hose an fittings..set up to use -10 an hose;;running each breather to it's own breather tank;;will the -10 an hose be big enough???

 

It depends on what class your running. Thats ok for ET or advanced ET, but if your going to run Top Sportsman, Top Dragster, or higher, you have to have "Two 1-inch diameter connections. All breathers must be positive locking."

 

will be more just fun and gurdge racing and some outlaw pro/street racing

 

Hey Ron, did you get the wiring diagram fax?

 

yes;;got fax yesterday.that is way i thought but just wanted to be sure first..thanks

don
badtoyzz racing

 

hose for breather

A -10 hose is just 9/16 in inside diam. I would run something a little bigger. There is a reason that a min. of 1 in is required. Good luck Don

 

so should go -12 hose then?

 

Run bigger.

When we first started we used two #12 hoses, one vent on the dry sump tank and one vent out of the valley, that was definently not enough.

We added one 1 inch vent to each valve cover and all our oil leaks went away.

Seems blower motors have alot of blowby, who would have guessed.

 

Also if you ever loose a piston it could make the difference between an oil fire pr crash and no oil fire or crash.

 

looks like i need to go to -16AN or 1" hose then to breathers..
thanks everyone.
don
badtoyzz racing

 

I just went thru this with a buddy of mine. he had a #10 line running from one valve-cover to the other, then a T-fitting ,then to a catch tank on his streetcar and it kept pushing oil out the rear main seal. well I got looking at it and the chinese #10 male to 1" pipe fitting in the tank only has a 3/8 hole in it.
So he was trying to vent the whole engine thru one 3/8 hole

The only time I've ever seen to much vent is when its a big hole in the side of the block!

 

below is what i wantedto use..no room for anything else..was wanting to run 2 of these.one for each valve cover BUT only ones of any brand i've found so far is only -12 AN hose..anyone know where i can get one for -16 AN hose?the an -16 is 1" id that everyone is saying i should go with.

 

I would not use one of those, they do not hold enough volume and will spill over onto the track, I've seen it first hand on a friends blown altered.

You might want to make one yourself like I did below. It holds around 1.25 gallons and uses 1.25" id hose:

 

very nice job..will i need that big with me running only 20%od with a standard litterfield 12-71 blower?i'm running a wet sump pan that only holds 8 qts..what would be the smallest tank i can get by with and still be safe[that is my main concern also is be safe.don't want to hurt myself or someone else]
don

 

Thanks, and, I would not go any smaller than one gallon.

My setup is 406 sbc w/6-71 with the same size pan as yours.

As I stated in my first post, a friend of mine was running the small tank and it filled up sometime around the burn out. He made it to about the 100 ft mark when the tank started to spill out and he nearly lost control. When we got to the car, you could see oil had pushed out the breather and had spilled oil all over the motor, it was mounted in front of the motor.

Other will probably chime-in, but I would rather have too big of tank than too small and one gallon is typically the minimum size in most rulebooks.

 

paul;;;;does the tank need bafflers inside it or just a open tank?

 

Yes, it should have baffles, mine has 2 vertical and 1 horizontal with horizontal being below the breathers and the 2 vertical separating the hose inlet to the breather area.

 

If you want something that looks similar check out Moon equiptment co. A little bigger wall thickness. Think about oil under YOUR tires..... or worse, 1 tire.