Author Topic: smoke breather caps  (Read 2921 times)

67fastback 390

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smoke breather caps
« on: May 15, 2010, 11:30:09 AM »
hello,

i own my fastback for 4 weeks.

when i first drove the car there where only 730mls on it after the restoration.

after a extra 1000mls i noticed some smoke coming from under the hood.
when i opened the hood i noticed the smoke came from both the breather caps.

when i asked around over here(the netherlands) the mechanics told me diffirend things, some told me this is normal and a pcv system is the solution to the smoke .others told me it smokes a bit to hard.
the mechanics over here don't have a lot of experience with american cars so i tought it would be bether to ask for advice on a mustang forum where there is a lot of experience with these cars.

could some one take a look at the youtube video i made .and tell me if there isn`t to much smoke coming from the breather caps.notice smoke on 37sec and 45 sec


greatshapestang breather caps


here are some specs from the engine the previous owner gave me:
390fe rebuilt to 30 over with competition cam.
crank: .010./.010 balanced,line bored,hot plate honed,decked,treu roler set,
mallory ignition
holey 650 cfm 4bbl vacuum secundary carberator with pressure regulator and pressure guage.
k&n air intake.
edelbrock street performer intake manifold.
hooker performance headers.


i`m not car mechanic,installing a pcv will be no problem for me but if its a bigger mechanical problem i have to go to my mechanic with the advice i hope to find over here.

thanks,
roy

sorry if my engish writing is a pain in the ass to read

Soaring

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Re: smoke breather caps
« Reply #1 on: May 15, 2010, 04:12:47 PM »
Looks like you are burning oil, or you don't have a PCV system.  I'd get rid of those aftermarket covers and get one with a breather cap, and the other a PCV system and run that to either the carb, or underneath it on the spacer.  Be sure to get a spacer with the little metal tube coming out of it so you can attach the PCV hose. 

67fastback 390

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Re: smoke breather caps
« Reply #2 on: May 15, 2010, 05:47:53 PM »
Looks like you are burning oil, or you don't have a PCV system.  I'd get rid of those aftermarket covers and get one with a breather cap, and the other a PCV system and run that to either the carb, or underneath it on the spacer.  Be sure to get a spacer with the little metal tube coming out of it so you can attach the PCV hose.

i don't have a pcv system.the caps on the valve covers ,are breather caps.Is the smoke to much or is this normal without a pcv system?

Next week i'm going put a pcv system on my mustang.

Thanks for the reply,
roy


Soaring

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Re: smoke breather caps
« Reply #3 on: May 15, 2010, 05:51:28 PM »
Yeah, that smoke could just be normal engine pressure that builds up in the crank and it has to go somewhere, therefore the breather caps.  It should be going through the carb and getting burned again. 

Jeff73Mach1

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Re: smoke breather caps
« Reply #4 on: May 17, 2010, 02:20:58 PM »
That smoke does not look excessive for a car without a PCV system.  Once you add the system you should be fine, but you will still see a bit of smoke from one side from time to time unless you vent it into the air cleaner housing.

PCV systems are designed to catch that smoke AND to reduce the air pressure in the crankcase which helps the rings to seal better.  Without a PCV system, you use vented caps like you have, but there is no evacuation going on.

Your english is fine better than I speak any foreign language.

Soaring

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Re: smoke breather caps
« Reply #5 on: May 17, 2010, 02:26:41 PM »
I think we all agree that a PCV system needs to be installed, and that those aftermarket covers need to be sold at a garage sale. 

Jeff73Mach1

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Re: smoke breather caps
« Reply #6 on: May 17, 2010, 02:42:25 PM »
You can get a breather cap much like the ones you have, but with a grommeted hole for the PCV valve.

Did I catch a glimpse of an adjustable brake proportioning valve?  Tell us more about your car!

(The engine compartment looks real nice but not 100% stock)

I don't have a complaint with the valve covers and sort of like to see some individualization on these old cars (Unless they are a very rare or significant variant)

 

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