CCV Mod Hose ID ?

[colonel angus]

Need the hose I.D. from the "Dog House" down to the canister.

Thanks

[Galaxie]

5/8" od


Sent from my iPhone using Autoguide

[colonel angus]

You sure that's the Outside Diameter? it seems a lot larger than that.

I thought it was 3/4" Inside Diameter minimum.

Denny

[Galaxie]

No. I used 5/8 ID (thats what I have in my recept file here). NO CLUE why I put OD. My phone must have auto corrected me and said I was about to OD on all this coffee.

My bad.

[colonel angus]

no harm, no foul.

D

[late_99_PSD]

I used 3/4 heater hose, which is 3/4 O.D. and I think* 1/2" I.D.

[bismic]

I have measured the pressure in the crankcase after installing a 5/8 in hose and then after installing a 1 inch hose. There is a noticebly higher crankcase pressure w/ the 5/8 inch hose. IMO the 3/4 size is the minimum you should use.

[jerg_064]

1"...the factory hose to the intake is 1" ID....I just my CCV to atmosphere mod. Also keep in mind that on the factory closed system the turbo creates vacuum and PULLS the air out of the crankcase...Much like Header e-vac and belt ran vacuum pumps on drag cars, so with a CCV only or and inline filter/catch can/more tubing length (i.e. more restriction) you definitely don't want to go smaller than stock. I used 1" ID clear reenforced hose from Lowes'.

I got half a mind to take the oil filler off the pass side and find an elbow to fit in there and vent both sides like every gasser vent to atmos set-up.

[bismic]

Originally Posted by jerg_064

1"...the factory hose to the intake is 1" ID....I just my CCV to atmosphere mod. Also keep in mind that on the factory closed system the turbo creates vacuum and PULLS the air out of the crankcase...Much like Header e-vac and belt ran vacuum pumps on drag cars, so with a CCV only or and inline filter/catch can/more tubing length (i.e. more restriction) you definitely don't want to go smaller than stock. I used 1" ID clear reenforced hose from Lowes'.

I got half a mind to take the oil filler off the pass side and find an elbow to fit in there and vent both sides like every gasser vent to atmos set-up.

Well said!

FYI -

I have installed a pressure/vacuum gauge on the oil dipstick to check the backpressure and/or vacuum after installing the ccv re-route (I installed a filter and returned the vent to the intake). Also, I did some pressure drop calculations using "blow-by" rates in cfm published by Racor. They recommended using 10 cfm flow for a well worn 6.0L engine (so this was a conservative rate IMO). At this rate, I calculated that you need AT LEAST 3/4 inch hose and you would be better off with 1 inch hose to avoid backpressuring the crankcase beyond 0.3 psi. THE PC/ED MANUAL STATES THAT THE MAXIMUM CRANKCASE PRESSURE SHOULD BE 0.3 PSIG. I used 1 inch hose to and from the filter.

I was hoping to get some vacuum, but the intake will not normally produce enough vacuum to put your crankcase under vacuum. Only at WOT accelerations, did I see a very slight vacuum being pulled - at most 1 inch of mercury. Typically, I saw a very slight back pressure- a few tenths of a PSI or less.

I was shooting for 0.25 psi or less backpressure at all times. I do not think I would have achieved this with 3/4 inch hose (according to calculations). I will say that the calculations required some fairly big assumptions and I tended to be conservative.

[colonel angus]

Well i went with the 3/4" ID hose bib on my K&N mini filter and it won't fit, needs 1" I.D.

So that was just money wasted.

d