Here is my 2 cents.
This was an uneducated approach to eliminating emissions. My main
reason for emanating them was I did not wish to understand them!!!
First I pulled out the charcoal canisters and plugged anything that
was coming off the carb. Now I was left with a hose going from
the valve cover to the carb. So I tried venting the valve cover to
the air and plugging the vacuum pipe in the carb. Results were I was
blowing oil out the dip stick and oil cap but not the vent to the air.
So then I put an arbitrary off the shelf PCV valve in between the valve
cover and the carb. Results were lots of white smoke at about 3500
RPMs. In adding to the smoke, I was blowing oil all over the inside
of the engine. So now I am back to a simple hose that goes from
the valve cover to the carb. Just like what was there. Overall, for
whatever reason, the best performance came from the vent that went
to the air. I hope that someone can befit from my blunders.
Best of luck to you on this one.
Dave C
79 Spit
75 Spit (parts)
>----------
>From: Spitfire15@prodigy.com[SMTP:Spitfire15@prodigy.com]
>Sent: Wednesday, July 23, 1997 8:00 PM
>To: bnicho19@bellsouth.net; triumphs@autox.team.net
>Subject: Re: Crankcase Breather mystery solved...
>
>-- [ From: old chris * EMC.Ver #2.5.3 ] --
>
>
>>
>> Chris
>> -------- REPLY, End of original message -------- I don't know. I don't
>have emmsions junk on the car any more. Before if I tried to oil the
>spit with the engine running it blew oil everywhere. (I know. Why would
>I oil the car w/engine running?) Anyway now when I put my hand over the
>open oil cap I can feel a slight vacuum. I don't see any place for a pcv
>valve to go on this engine. where does yours connect?
>
>Bill
>
>Bill;
>
>Mine doesn't have emissions either, but I have been researching a way to
>get a more effective breather system in place.
>
>From looking at the diagrams in several sources it appears that the PCV
>valve would normally be connected to the breather hose and continue on
>to the carbon Canister. From the PCV another hose would go to the
>manifold. When manifold presure was sufficient ( not sure of amt ) the
>PCV would open and route the unburned gases into the carb to be burned.
>Also at this same point I think the gas vapors in the canister would
>also be vented into the carb. When not enough vacuum is present the
>gases from the valve area would go to the canister. The oil trap in the
>valve cover is supposed to stop oil from entering this particular
>circuit.
>
>Now you see my reason for surprise at hearing that you now have a vacuum
>in your valve cover and also do no have the PCV circuit connected. I
>could see the vacuum in the valve cover if the manifold line was
>connected with the PCV, but without it I would think you would have
>positive pressure. Unless somthing is pulling the air into the cover
>such as valves ?
>
>Can anyone shed more light on this ?
>
>Chris
>'78 Spitfire ( Autocrosser that has bad breath, but not breathing
>problems )
>-------- REPLY, End of original message --------
>
>
>
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