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Catch Can

Started by _rorym_ , Oct 11 2008 02:53 PM

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#51 _The Baron_

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Posted 04 November 2008 - 11:23 AM

Moot, do you have a contact name and number for this well of good info?

With this chap being in NSW and I am in SA, I don't think I will ever have the chance of parking my car in his workshop and having him apply the fix for a fair $.

Will this require an engine out fix? I am not looking for hints as to what the solution is but what level of work.

Cheers

#52 _rorym_

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Posted 19 November 2008 - 10:42 AM

OK...We still have oil in the catch can after Noosa......leak down test is OK...its not there...must be a combo of hi volume oil pump...grip in the corners and associated speed...still does it if I hold 3rd alll the way but nowhere as bad. Builder and I are going to work on a fix....any suggestions would be great...come on you gurus...we have a few ideas...just need confirmation...PM if you like.
R

#53 Litre8

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Posted 19 November 2008 - 10:59 AM

How much oil are we talking about?

#54 _rorym_

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Posted 19 November 2008 - 11:38 AM

1 litre....1.5L
R

#55 Evan

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Posted 19 November 2008 - 01:28 PM

as i asked above, is there anything wrong in just plumbing it back down into your sump instead of it going into a catch can?

Cheers

Evan.

#56 Litre8

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Posted 19 November 2008 - 01:46 PM

Can you swap the rockers so that the breathers are at the back, its under heavy braking that you are forcing the oil forward in the rocker cover out the breathers? Just a thought.

#57 grina05

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Posted 19 November 2008 - 02:15 PM

ive got the same problem
was at a hillclimb on the weekend,all up hill an no heavy braking
steve

#58 orangeLJ

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Posted 19 November 2008 - 02:54 PM

Evan, I think the problem with plumbing it back to the sump was the contamination of the oil from condensation etc.

#59 _rorym_

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Posted 19 November 2008 - 03:30 PM

Well this was a thought...tap in some ports at the lowest point..preferably the back...then straight into the valleyy...then have 2 breathers fitted to the highest point to a catch can. I am told L Perkins did this but the lower pipes were on the inside of the tappet covers.
R
Posted Image

Edited by rorym, 19 November 2008 - 03:32 PM.

#60 Litre8

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Posted 19 November 2008 - 04:12 PM

Agree, I still think the new top breathers should be located at the back of the rocker cover too.

#61 _rorym_

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Posted 19 November 2008 - 04:43 PM

Howard...that woud be the lowest part on the top of the rocker cover...don't you mean the front? I read MickLX race car post but don't actually want to go to the extremes of pulling the heads and welding up the push rods holes to make them smaller...there has to be an easier way ...
R

Edited by rorym, 19 November 2008 - 04:45 PM.

#62 Litre8

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Posted 19 November 2008 - 05:58 PM

Ok what I meant was the new breathers to be on the top of the rocker covers but towards the rear to get them away from any 'wave' of oil under braking. Much like your diagram.

#63 _rorym_

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Posted 19 November 2008 - 06:54 PM

See what your saying but I still have the problem with massive acceleration...which this mother is capable of...maybe in the middle would be better?..Then the oil passes under going up and down?
R

#64 Litre8

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Posted 19 November 2008 - 07:09 PM

Yes, good thinking Batman!

#65 _evil UC hatch_

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Posted 19 November 2008 - 07:59 PM

I was going to suggest mounting the outlets in the middle but you beat me to it

#66 76lxhatch

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Posted 19 November 2008 - 08:22 PM

Why wouldn't the baffle design would have greater effect than repositioning the outlets?

#67 _rorym_

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Posted 19 November 2008 - 10:31 PM

Baffles.....baffle??..They dont get rid of oil that is already in the covers to the top..??
R

#68 _The Baron_

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Posted 19 November 2008 - 10:46 PM

Hmm if you can't stop it getting to the top, you need to drain it back quicker and I guess that is what you are hoping for with the hoses through the inlet manifold.

Mate, if you have 1-1.5 litres in the can, hows the sump level?

Have you seen my RC baffle change? Seems to be working so far but I am not doing track work.

#69 _rorym_

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Posted 19 November 2008 - 10:50 PM

7 litres in the sump total...no oil pressure issues....just need to keep it there.
R

#70 GML-31

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Posted 19 November 2008 - 11:00 PM

used to have oil issues with my VK GRPA, ended up removing the high volume pump, Rory in your case could it be that your pipes to the catch can are too large making it an easier exit for the oil??

#71 76lxhatch

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Posted 20 November 2008 - 04:53 AM

Baffles.....baffle??..They dont get rid of oil that is already in the covers to the top..??
R

I thought they were intended to stop (well restrict or slow at least) any direct flow of oil so that even when there is a lot up top, less comes out the breather? If moving the catch can outlet reduces the amount of oil washing out why couldn't a well-placed baffle/splash guard do the same thing? (Serious question)

#72 _moot_

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Posted 20 November 2008 - 05:55 AM

...must be a combo of hi volume oil pump...


we have a winner :clap: use a stock pump.

#73 _mumbo_

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Posted 20 November 2008 - 08:04 AM

I just rebuilt my engine with std pump i blocked cam bolt hole and cam chain oiler and it cruise at 3000rpm with 55psi oil pressure , idle,s with 30psi

#74 Litre8

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Posted 20 November 2008 - 08:35 AM

I would have thought cam chain oiler was somewhat important or does the chain get enough lubrication from just oil splash?

#75 _mumbo_

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Posted 20 November 2008 - 01:26 PM

Thats what ive been told , cam chains are cheap compared to bottem ends due to lack of oil
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