Catch can design

[pureadrenalin]

While doing a re-build on my race car, I'm looking for a new catch can.
I can't find one I like.
Are the things I'm looking for necessary?

1. to be able to open it up (not fully welded)
2. two 1/2" NPT inlet ports
3. vent filter
4. drian fitting.

I don't care if it has a clear pipe for a level gauge.

I did a quick model of one with stainless steel fittings I can purchase.
Simple clamp, with a flange that looks like an exhaust v-clamp with a blank for a lid.
I intend on filling it with stainless steel wool.

What do you think?

[iOnic]

Why do you want to open it?

[pureadrenalin]

Not sure exactly. Just a normal want to be able to inspect everything on the race car. If something is sealed, I can't check, inspect, replace, upgrade, easily.

[allencr]

3. vent filter

Filter what & for what reason?
Blowby exiting the engine isn't going to harm the Earth any less from being filtered.
Air entering won't happen when running, won't matter when stopped. It will protect curious insects.

[pureadrenalin]

Vent filter just to hopefully catch the last of the oil vapor before it decides to deposit itself all over my engine bay.

[iOnic]

Filter keeps things nice and clean. If you're going to have it so you can open it and inspect it could you just do away with the drain altogether and use the inspection time as an opportunity to drain it too? Or are you plumbing the drain back into the block/sump?

Can't see anything wrong with your design. Looks good and should do the job well.

[Mr Ree]

I would recommend filling it with "steelo's" to act as a baffle for the oil/condensation to cling to.

[Lurkin]

nice - exactly what I have been looking for as well. not written on your post - but considered size? pretty sure I've read on here there are requirements regarding size for motor sport? no pretending to know the ins and outs - but something to think about.

Have been thinking of a larger diameter fitting where the filter would go - to put a larger diameter pipe down behind the guard? wasn't sure how much mess they make with a filter on...

can you PM me when you find one/ someone to make it? could be interested as well.. cheers!

[QikStarlie]

run the biggest breather pipe /pipes from the cam cover you can. less velocity will mean less oil is throwen out to start with.

[Stott69]

Theres a couple of guys that have designed these on here, both in palmy too. the steel wool idea is a goer tho I think

[sergei]

I was thinking of making a funnel like in dyson vacuum cleaner so the oil centrifugally would be deposited on the walls.

[Bling]

I think you should think more about SC'ing that Ist

What about a wingnut or similar to hold the lid on?

[sergei]

I think you should think more about SC'ing that Ist

What about a wingnut or similar to hold the lid on?

Or getting my ST165 going...

[pureadrenalin]

Size wise to meet motor sport regulations at 4" diameter I'm using, it only needs to be 100mm long. I'm making it around 180-200mm.

I'm intending on running two AN10 lines from my cam cover.

[pureadrenalin]

Theres a couple of guys that have designed these on here, both in palmy too. the steel wool idea is a goer tho I think

I'm happy to gather up all the bits if someone can weld it up for me, otherwise I'll have a go with a mates tig.

I was thinking of making a funnel like in dyson vacuum cleaner so the oil centrifugally would be deposited on the walls.

I was thinking of the same thing, and where I work, we design these kind of systems for the oil and gas industry, but it all just got too hard

[Santa'sBoostinSleigh]

Garniee, either me or a guy I know would be able to TIG it up for ya

[gt4dude]

Are there regulations for motorsport use?

I heard it has to be 2L and filtered if not running sealed system?

Also, do you run separate tanks for PCV and breather ports? Or run them both into the same can?

Do you swap the PCV valve for a large metal nipple that fits the hole?

[matt dunn]

Are there regulations for motorsport use?

I heard it has to be 2L and filtered if not running sealed system?

Motorsport rules are,


up to 2000cc needs a 1L catch
and 2000cc one over needs needs a 2L catch,

unless it is a sealed system i.e. the PCV valve is still there and feeds back into the intake in which case there is no catch can at all.

[RomanV]

Also, do you run separate tanks for PCV and breather ports? Or run them both into the same can?

They both get air/fumes from the same place, so no need to seperate them. Could probably just have one blocked off, but probably better to have both feeding the tank I guess.