DeTomaso Mailing List: November 97, Message #104
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We used to have the same problem when running a Boss 302 engine in a boat (circle racing). The problem was caused by the oil not being able to drain back down to the pan quick enough with a high volume pump and high revs. I have not heard of this happening with the 351C, but the only way we were able to solve it was fitting 2 large Airquip hoses to each valve cover down externally to the oil pan. I am sure that you wouldn't want to do this, but if the problem is caused by the same thing, I would check out the drain back holes on the driver's side head. Probe to see if they are partially or completely obstructed by the head gasket. Also, are you sure your PVC valve is not stopped up? Although at WOT there isn't any vacuum. Maybe you will have to go to "exhaust" PVC for racing (wouldn't work though if you have to run mufflers). Ted (Vader) Mitchell http://home1.gte.net/tmitch/pe.htm http://home1.gte.net/tmitch/chpie.htm http://home1.gte.net/tmitch/index.htm ---------- > From: KVERGES@figdav.com > To: Multiple recipients of list <detomaso@realbig.com> > Subject: Re: Oil Guyser From Valve Cover Breather > Date: Monday, November 03, 1997 9:22 AM > > All, > > I have an irritating oil "leak" that I am pretty sure originates from the breather on the drivers side valve cover. I have the simple "half-twist" breathers with the tabs that go in the slotted hole of the cast valve covers with "DeTomaso" on them. The breather is in turn connected to the air cleaner. Passenger side breather goes to functional PCV valve. > > No problems on the street. > > However, at last weekend's vintage race (TWS), we switched track directions with a lot more high-rpm sweeping turns to the right, which I theorize combined with the oil being hot and pumped up into valve covers, allowed oil out around base of the breather. Big mess and a couple of black flags until I started short-shifting. > > I already have restrictor pushrods (Smith Bros with .090 feed holes) in place and run hydraulic lifters. I want to be sure valve springs get cooled and lifters get oil, so cuttting off more oil internally seems a problem. > > I was thinking about pulling valve covers, modifying them for positive seal breather or welding on an AN-10 or 12 fitting, and putting a breather up high and relatively centered on the engine, but this could be unsightly. I could have a vented catch tank, but I would have to empty it at least every session and it might fill during the session. BTW, the engine is tired enough that I probably have a bit too much crankcase pressure. Last compression test was good at 180 psi +/- 5 psi on all 8, but I haven't done a leakdown test. > > Then I thought about sealing valve cover altogether and venting crancase through a hole in the intake manifold, venting directly from the "V," which presumably can't fill up with oil. > > Anyone have similar problems and solutions/suggestions? > > THX > > Keith > >