Crankshaft Breather Hose

[i3igpete]

Want to take some measurements of the fitting? I would imagine it's a pretty standard size.

All I've got at home is just a tape measure... looks like a hair under 5/8 inch diameter. maybe 15 mm?

The barb is 1/4 inch, not having much luck finding a breather of that size. 3/8 inch is about as small as they go.

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[racebuild]

All I've got at home is just a tape measure... looks like a hair under 5/8 inch diameter. maybe 15 mm?


The barb is 1/4 inch, not having much luck finding a breather of that size. 3/8 inch is about as small as they go.

AN-4 would fit a 1/4” Barb fitting. Could use a non-stainless reinforced hose like push lock hose or a pro-lite hose.

 

[i3igpete]

About 2 weeks ago I harvested the fittings from a new stock hose and connected them with some 1/4 inch 30R7 fuel hose (about 12 inches or so). I was debating on 30R9 or 30R10, but I figured the reduced permeation would come at the cost of increased stiffness (and therefore, less strain relief), which isn't a good thing if the fittings are the weak link.

However, a small breather on the CCV and capping the intake would still be ideal, IMO. Here's what I was thinking, I'm guessing you were thinking of the right option?

 

[i3igpete]

Also discovered that p2uned does make a block-to-6AN fitting (probably checkless?), but it's a little pricey.

https://www.p2uned.com/product-page/p2uned-breather-fitting-kit

 

[Eddie21]

About 2 weeks ago I harvested the fittings from a new stock hose and connected them with some 1/4 inch 30R7 fuel hose (about 12 inches or so). I was debating on 30R9 or 30R10, but I figured the reduced permeation would come at the cost of increased stiffness (and therefore, less strain relief), which isn't a good thing if the fittings are the weak link.

However, a small breather on the CCV and capping the intake would still be ideal, IMO. Here's what I was thinking, I'm guessing you were thinking of the right option?

Any update?

 

[i3igpete]

Any update?

I wasn't able to find a hose with the correct wall thickness to make #2 work so i gave up. everything i could find was too thick.

 

[razorlab]

I wasn't able to find a hose with the correct wall thickness to make #2 work so i gave up. everything i could find was too thick.

Sir, this is a family-oriented forum.

 

[i3igpete]

Possible solution, finally found a filter with 1/4 inch ID

https://c3powersportsusa.com/products/intake-breather-filter?variant=46512521543965

 

[i3igpete]

It's too tight to butt the breather right up against the ccv. need to give it 6 inches of length to make a bend. Theoretically, it would have fit if the Breather had a rubber clamp on instead of a plastic Barb.

 

[i3igpete]

Out of curiosity I grabbed a brass 90 and see if it would fit between the crankcase and turbo without getting in the way of intake or charge pipe. The answer is no, there's also not enough space to clock it to the left or down

 

[tracer bullet]

Maybe:

https://hpsperformanceproducts.com/...k0qQDxmD_W1Ce1QmEzP_Uy9rBfpi6UmRMdDh8eF1xK607

or

https://mgs4u.com/product/90-degree...R2yRR-jbDsyn2Lrr4F7qO6JdlZuy5XPRoCbu4QAvD_BwE

???

 

[i3igpete]

That first one would probably work if you chopped it down... Though at this point i dont think anyone cares but me and I'm just typing into the void

 

[Subydude]

Does any oil actually come out of this port, or is it strictly for fresh air sourcing?

I'll freely admit I haven't looked at the B58 crank case venting or how it's setup other than the cursory search to see if it needed a catch can on track. That said I'm curious about this since I've long been a fan of removing possible oil contamination into the IM.

 

[i3igpete]

Does any oil actually come out of this port, or is it strictly for fresh air sourcing?

There is a check valve in the fitting that only allows air to go into the crankcase from this hose. That being said, no check valve is perfectly leakage-free and some oil will weep out over time.

https://www.supramkv.com/threads/address-blow-by-oil-ccv-or-pcv-catch-can.33616/post-515952

 

[Subydude]

There is a check valve in the fitting that only allows air to go into the crankcase from this hose. That being said, no check valve is perfectly leakage-free and some oil will weep out over time.

https://www.supramkv.com/threads/address-blow-by-oil-ccv-or-pcv-catch-can.33616/post-515952

Interesting. That's actually relatively similar to what the older LS1/6 engines would do to the fresh air port. Most would use a 1 or 2 psi check valve, and like you mention it wasn't perfect but it did cut down dramatically on oil going into the intake. I commonly use the little breather you did since it perfectly fits the OD of a 3/8 ID rubber oil hose.

I always chuckled at the vette guys saying the crank case needed a vacuum pulled from the intake to help ring seal and a bunch of other things, but then would also say you needed to have the fresh air source hooked up as well. They seemed to not get that the fresh air port was much larger in diameter than the PCV and the inside of the block was basically atmospheric pressure all the time either way. VTA has it's benefits and most people don't realize just how little vacuum there is inside a wet sump engine that doesn't have a belt driven vacuum pump.

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