Date: Thu, 10 Mar 2005 20:13:07 GMT
From: Paul Halliday <>
Subject: Re: Oil Catch Tank

in article, Dexter J at wrote on 09/03/2005 22:13: > Salutations: > > On Wed, 09 Mar 2005 21:48:25 GMT, Paul Halliday <> > wrote: >> in article MYEXd.209$, chris at werwenospamcom >> wrote on 09/03/2005 15:52: >> >>> >>> "Robert" <> wrote in message >>> news:qpqXd.132043$ >>>> Paul Halliday wrote: >>>>> I'm looking for an oil catch tank solution for the crankcase >>>>> ventilation >>>>> system on my 1989 900 T8. I'm getting oil dripping down onto the fuel >>>>> metering plate and into the airbox. I'd like to (a) stop it and (b) >>>>> get a >>>>> handle on how much oil ... I don't seem to need to top up at all >>>>> really; >>>>> maybe a "gloop" now and again. >>>> ----8<----cut--- >>>> >>>> Paul, I've had oil drops come from the valve cover ventilation hose to >>>> the >>>> air filter canister and clog the filter on my cars. But this was on >>>> single >>>> carb 900 and 99 cars (had one of each). >>>> >>> >>> I think nearly all of my 8v 99/900's carb or injection had some small >>> amount >>> of oil in the airbox. >>> >>> suppose you could vent to atmosphere.... >> >> Yeah ... But I'm getting oil actually on the fuel metering plate and I'm >> not >> sure that's a "good thing" :( >> >> I've actually just this minute tried a VTA test. I blocked up the vac >> line >> at the intake manifold and the end of the hose that comes from the top of >> the crankcase. I then stuffed a breather filter into the hole and .... It >> stalled ... >> >> I adjusted the throttle stop screw and it seemed to idle okay. What >> happens >> then? Is that okay? Can anyone see any problems with that? >> >> Ideally, I'd like to put a catch tank inline into the system. So, idiot >> questions: >> >> 1. What does the vac line *actually* do? Yes, I know it sucks at idle and >> prevents boost entering the crankcase by using a one-way valve ... But >> what >> does it actually do? >> >> 2. Do I need it? Can I just stump up the basic idle and have done with >> that >> part of the system? If so ... Do I need to do the catch tank >> installation, >> or is venting to atmosphere okay? I know there's a performance gain >> associated with doing that, but I have a road car not a track car! > Hey brother Paul - I'm afraid I don't have the answers to the particular > questions. However I wanted to let you know that I had what I thought was > a similar problem on an old 99 engine which turned out not to be vent oil > at all - but simply condensing fuel varnish weeping down the manifold > walls when it got damp enough. > > While the system required an annual wipe and clean when I did the filter - > my wrench at the time said I shouldn't be bugged too deeply by it. Yup! I'm kind of bothered, because I clean my air filter about every 3 months and the metering plate is always covered with oil. Anyway, I've been running without the PCV vac pipe today and a filter stuffed into the crankcase. Seems to run fine ... Even a little sportier! I've got the design for my homebrew catch tank finalised, so I'll pick up the bits at the weekend and get it made. I know I shouldn't worry, but I'm a dog with a new bone and want to see this crazy idea out ... I'll probably put it back to stock in 6 months time, but it keeps me off the streets and away from hard drugs :) :) :) Paul 1989 900 Turbo S

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