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Old 07-23-2005, 02:49 AM   #1
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Join Date: Jul 1999
Location: Vancouver, BC, CANADA
Default high G oil surge in heads

Hi all,

is anyone making a 'kit' of breathers/lines/catch tank that retain the crank pressure venting and head breathers but dont let the heads piss out oil out of the breathers at high Gs ? Kind of like the various 'catch tank kits' out there, but one that assists with this issue via a combination of creative routing of breather lines such that the heads feed back ? I realize its easy to do yourself, I am looking for a kit for someone else.

Mine has breather filters each side and dual catch tanks, but that seems a bit much for this guys' occasional track car, so just checking if someone's got a less expensive kit out there that accomplishes this (its not for my car, but for somone DIY-inclined who I think would be willing to buy it if it was the right piece of kit). Just making the lines go 'high' (which works actually) is kind of ghetto if you know what I mean.

p.s. please do not post about "you don't need it", "my car runs fine" etc. I am looking for a soloution and yes this is a real problem. I am sure other high HP track guys see this as well (I've tried searching under 'head oil surge' but I just get a lot of catch tank stuff). Most people dont believe me when i tell them that the heads piss oil out of the breathers if they run high Gs, but they do and they can.

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Last edited by patr; 07-23-2005 at 01:40 PM.
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Old 07-23-2005, 04:01 AM   #2
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You could use a set of the domestic crankcase evac kits. They're cheap and do the job without needing to resort to evac pump systems.

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Old 07-23-2005, 07:58 AM   #3
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many most all


There is never any pressure put into the block or heads, even though PCV stands for positive crank case ventalation, it does not mean positive pressure. Just be sure to keep system closed, as the motor gets metered air thru PCV during idle and vac.

So what problem are you trying to solve? You mean you get oil flowing out of the top of the valve covers? Out the breather?
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Old 07-23-2005, 01:27 PM   #4
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no, you are not understanding what I am talking about, I am talking about the heads, oil surge does build up in the heads if you pull a lot of Gs

we deal with it on the tarmac rally cars a specific way, I am looking for simple kit for a street/track car that I can recommend to someone to install themselves

-Pat www.rocketrally.com
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