Oil catch can needed?? st185

[FoRsaKeN]

Hey there guys, just been doing soem reading on catch cans
read the post on the forum about htme, and seems to be lots of thoughts and idea's

Was just wandering what the bad effects are of just unpugging the PCV pipe, and just droppping it down to the bottom of the engine bay(pointing down but not plugged up) and just plugging up the intake piping. Then re-connect for WOF ????

???

Thanks

[shazeal]

If you just cant afford a bling bling can, get a coke bottle or something stuff it with steelos from the $2 shop and stick the tube into that and cable tie it somewhere not too hot somewhere behind the intake pipe is prolly a good place
Or if you want to be real flash you can pick up some gutter tubing from placemakers or somewhere and some of the end caps, a couple of brass or plastic adapters to stick the oil tube on. Epoxy an end cap to the bottom of the tube to the tube. drill a couple of holes for the adapters and screw em in and seal them with silicone. Stuff it with $2 shop steelos, and stick the top cap on with silicone so u can get it off again later. Connect one tube upto the cam cover and the other to the intake. Cable tie it all somewhere and gtg
Bout $15 tops for all the bits. Could get some spray paint and paint it too... bright pink??

[Adydas]

If you cant afford a can can you really afford to put gas in it ? Get a can if your going to do it, Do it right.

[RedMist]

Hey there guys, just been doing soem reading on catch cans
read the post on the forum about htme, and seems to be lots of thoughts and idea's

Was just wandering what the bad effects are of just unpugging the PCV pipe, and just droppping it down to the bottom of the engine bay(pointing down but not plugged up) and just plugging up the intake piping. Then re-connect for WOF ????

???

Thanks

Is an engine bay fire a bad effect?

You need to ask yourself why you want a catch can in the first place. Unless the car is breathing abnormally, or has an aftermarket ECU, you want to keep a vaccume on the block, it gives you less parasitic loss on the crank. IE you end up with more HP keeping the existing system.

[johntramp]

doesn't not having a catch can lower the octane level?

[FoRsaKeN]

Hey guys, thanks for the replies
Was just curious thats all..

Hey Redmist... Um, vacuum gives u less parasitic loss to the crank??? Could u explain that a bit better.

Was mainly wandering if the vacuum was needed by the intake. So, even if there was a can, would it be best to keep the full setup and just a filter inbetween, so the vacuum was still there???

Unplugging intake also get rid of the hot air that comes with the oil vapour through the PCV???

Thanks

[shazeal]

The intake doesnt need the vacum from the crankcase, and the crap that comes through will lower your octane (and power slightly i guess?). Main reason I did it is because I hate having to take off the TB every few months and clean the crap out of it.
Ideally you want to block off the input from the crank into the intake and just vent the crank pressure but its going to be illegal to do that soon, lots of places wont sell vented catch cans anymore because of this.
Even with a store bought one most of them are empty btw so u should still stick some steelos in them to help take the heavy crap out of the gases headed for the intake.

I wasnt aware of any "parasitic loss" from just venting, almost everyone my dad races with (this is bikes tho) just use coke bottles or a welded up pipe with some tape to hold the tube in.

[RedMist]

The crank rotates in air. The less air the less friction on the crank. Dry sumps, excavators and stock recirc systems all supply a vacuum in order to minimise the crank losses. Loose that vacuume and loose that benefit.

In regards to lowering octane, how much oil are you planning on burning? 1 ltr per 100 of fuel. ? Per 500ltr's of fuel?. Wont alter the octane substancially. The stock knock and O2 sensors will cater to any issues in that realm anyway.

TB gunge is a ligitimate issue, however I always found oil stains a great marker for head work!

[SUBARUCONVERT]

redmist, i dont see how the pcv valve will really allow for vac in the crank case when u need it, under full throttle in an N/A there is no vacume, so its more likly that pressure will be building in the case untill it opens the valve and vents into the intake. and as for a turbo, it will deff not open under boost, so u get a build up of pressure in the crankcase. Therefor i see no performance advantage, maybe even a dissadvantage for the turbos. I know my car creates the most blowby at WOT, u can smell it