I have a hose coming off my oil fill neck that goes to the underside of my right carb air cleaner. I recently looked for a split system, to feed both sides of the engine and was surprised to see that it was recommended to be connected to the front / top of the valve covers, not the air intake on the carbs. Makes sense to me, no burning of oil vapor. Does this really make a difference in performance? Is it worth the effort?
craig
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I don't think it makes any difference, performance wise, but it does release the extra pressure that comes with a large, high-performance engine.
Craig... Sorry for side tracking, but I was just in Spain vIsiting some friends, and one of my life long friends grew a beard...AND just noticed he looks JUST like your avatar, a youngish Dos XX guy... Wow!
i say youngish because he is already retired, and riding his BMW motorcycle arround the world... One year on the road and four continents completed... He flew back for a 40th b- day party ( not his) in Menorca.
the resemblance is AMAZING!
If by "performance" you mean: "will it make my car go faster?", then no. If you mean, "will it keep my pulley from spraying down the engine compartment with oil?", then perhaps.
Oil-spray and keeping the engine compartment dry is a never-ending quest. The ring-seal in most T1 engines is not very good, and nobody has valve-seals. The crankcase is an itty-bitty little space, and gets pressurized by the blow-by. Controlling the blow-by to start with is the first line of defense, but nobody is going to re-ring tnheir engine because they get a little oil spray (except for SOME people I know). The bigger the engine gets, the more air/vapor is getting blown around, and the bigger this issue becomes.
Separating the pressure from the oil-vapor is what the boxes and towers, and all that is all about. The ideal is for the hoses coming from the various places in your engine to be the "path of least resistance" for this pressure, so it won't blow out the pulley or anywhere else. Putting the box high, and having it be of sufficient volume is a nice idea. The EMPI boxes everybody uses get around the need for volume by making the box itself pretty much an open container with a stand-off lid to keep junk from falling into it.
I've got a sealed breather box, but I do a bunch of crazy stuff. The volume of the thing is several gallons, and I run as many big (like 3/4") hoses to it as possible. condensed oil has a chance to drain back these hoses, but I vent the top of the box into a Bernoulli tube and check-valve set-up in my exhaust (Moroso makes it), which actually draws a vacuum on the top of the box. I also have a dry-sump oil pump scavenging the crankcase-- both of these things in an effort to neutralize or draw a slight vacuum on the crankcase, and keep the oil from blowing out the engine anywhere. At least 50% of the reason I dry-sumped to stat with was to just not have so much oil in there to blow out to start with.
A guy doesn't have to get carried away to make this work, and can do one or more of these things to keep the oil where it belongs. But IMHO, the sweet-spot is a set-up like you describe. It won't eliminate the spray, but it'll help.
Good luck.
Ron O posted:I don't think it makes any difference, performance wise, but it does release the extra pressure that comes with a large, high-performance engine.
So you know the guy who is going to take over the XX commercials? I heard that after a message is found delivered in an old XX bottle from space, a new generation takes over as the "Most Interesting Man". You should have gotten his autograph.
and if you want to really go crazy, check this out!
http://www.shoptalkforums.com/viewtopic.php?t=118958
and this is the check-valve dealy-bob that vacuums your crankcase (literally, depending on where you put it!)
Will Hesch posted:and if you want to really go crazy, check this out!
http://www.shoptalkforums.com/viewtopic.php?t=118958
and this is the check-valve dealy-bob that vacuums your crankcase (literally, depending on where you put it!)
http:/enginerring/www.et-performance.com/...43c8d14556e5bc3afca6
TMI. I'm only running a 1641cc, with dual kadrons. This sounds, from what I can understand, like engineering overload. My car starts on demand , runs, doesn't get hot, doesn't smoke. And draws a crowd. "What me worry?"
Art
Well now Art...you likely run "gapless rings" 
ReV
Mr. Vosari;
I honestly wouldn't know. The description tells me, I think what they are.
Some how I think I am about to step in it.......How do you install something like that?
just vent the valve covers, you will be surprised as what that will do. bill
The valve cover connection is not an alternative to the connection at the carbs as described in your post!
You would have crankcase pressure entering both ends of the hose.
Any connection to the valve covers has to be vented to the atmosphere, a breather box, air cleaners, etc.
Thanks Michael. After seeing another installation I noted that the lines to the valve covers were vents going to the breather box. I thought at first they were FROM the breather box returning oil vapor to the engine instead of to the carb intake. I get it now. Boy you would think a mechanical engineer would know better. I never was an engine nut.
"Boy you would think a mechanical engineer would know better. I never was an engine nut."
WHAT?!?!?!?!?!?
Blasphemy!
Oh, wait......Come to think of it, none of my half-dozen or so Mechanical Designers were motorheads, either. No wonder I never really trusted 'em. Half of them went off to do bio-medical stuff.......Prob'bly drink "Starbucks" sweetly-flavored Lattes, too.
