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Username Post: Edelbrock valve cover for 283 chev what i need? vent cap or pcv breather?        (Topic#348842)
Golf4variant 
Forum Newbie
Posts: 5
Golf4variant
Loc: Nordrhein-Westfalen
Reg: 12-24-17
12-24-17 05:52 AM - Post#2718914    

Hi,

I own a 67er Cevrolet Caprice with 283er engine. I have now re-installed the edelbrock valve cover # 4443 with vent holes. On the old
valve covers is no vent hole.
Now Iam not sure what I exactly need.
My engine has an oil fill tube with a hose to the air filter.
Do I need 2x # 4403 without tube to the air filter or
1x # 4403 and 1x # 4413 with connection to the air filter? Wich way is the best?

Thanks


[click to enlarge]





 
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space66 
Contributor
Posts: 624
space66
Loc: montreal
Reg: 06-01-16
12-27-17 02:42 PM - Post#2719137    
    In response to Golf4variant

you need a pcv in valve cover if you don't have one in the back of block already...

1966 impala convertible 283*pg-396*th350


 
Golf4variant 
Forum Newbie
Posts: 5
Golf4variant
Loc: Nordrhein-Westfalen
Reg: 12-24-17
12-30-17 03:44 AM - Post#2719406    
    In response to space66

Hi,

okay, I have already one in the back of block.

So I only need two of this?:


The vent system:

[click to enlarge]


[click to enlarge]



 
raycow 
Honored Member
Posts: 27574
raycow
Loc: San Francisco, CA
Reg: 11-26-02
12-30-17 09:47 AM - Post#2719419    
    In response to Golf4variant

You appear to have a "closed" PCV system now with its air intake through the carburetor air filter. If the connection at the rear of the engine goes through a PCV valve and then into the carb or intake manifold, that is all you need. You would not want a vented cap with this setup. Any ports in the valve covers should have plugs in them.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Golf4variant 
Forum Newbie
Posts: 5
Golf4variant
Loc: Nordrhein-Westfalen
Reg: 12-24-17
12-30-17 12:07 PM - Post#2719439    
    In response to raycow

okay Ray! Thank you very much!

Niels



Edited by Golf4variant on 12-30-17 12:13 PM. Reason for edit: No reason given.

 
jktucker92 
Silver Supporting Member
Posts: 199
jktucker92
Reg: 02-05-17
12-31-17 09:08 AM - Post#2719520    
    In response to Golf4variant

Wouldn't you still need a vented cap? My '66 had the pcv hose from the back of the engine to the carb. It also had a vented cap in the filler tube at the front of the intake. I also had a '65 engine with the same arrangement. I thought you needed both a PCV system and a vent.



 
Golf4variant 
Forum Newbie
Posts: 5
Golf4variant
Loc: Nordrhein-Westfalen
Reg: 12-24-17
12-31-17 11:18 AM - Post#2719531    
    In response to jktucker92

Yes, I think I have the same. A pcv hose from the back of the engine to the carb and also a cap in the filler tube at the front.
My old valve covers had no holes (these were leaking).
I have now ordered the rubber plugs.
If the pressure is too high, the rubber plugs will squeeze out.

But I also wrote to Edelbrock. Let's see what they'll say about it.
Wait for an answer. Below is the guide by Edelbrock:





 
raycow 
Honored Member
Posts: 27574
raycow
Loc: San Francisco, CA
Reg: 11-26-02
12-31-17 04:06 PM - Post#2719568    
    In response to jktucker92

  • jktucker92 Said:
Wouldn't you still need a vented cap? My '66 had the pcv hose from the back of the engine to the carb. It also had a vented cap in the filler tube at the front of the intake. I also had a '65 engine with the same arrangement. I thought you needed both a PCV system and a vent.


All PCV systems require a vent, or more accurately, an intake air source for the crankcase to replace the air which is drawn through the PCV valve into the manifold.

You have what is called an "open" PCV system. On that type, intake air comes in through the vented oil filler cap.

The alternative is a "closed" PCV system, which I believe became standard starting about 1968 and was optional on earlier years. Others here might wish to correct me on the year if they know otherwise. On that type of system, intake air comes in through the carburetor air filter. This is what Golf4 has. You can see the hose connection to the air filter housing in his pic.

With the open system, full throttle operation can generate more blowby than the PCV valve can handle. This creates a positive pressure condition in the crankcase and the excess has no place to get out except through the vented cap. As a result, oil vapor can condense on the outside of the engine and other pollutants will be released into the atmosphere.

The closed system allows the positive pressure to vent into the carb intake air stream, where the oil and other pollutants will be consumed by the engine. This allows the engine to remain cleaner on the outside as well as keeping the pollution police in Washington happy.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
raycow 
Honored Member
Posts: 27574
raycow
Loc: San Francisco, CA
Reg: 11-26-02
12-31-17 04:13 PM - Post#2719571    
    In response to Golf4variant

  • Golf4variant Said:
.....I have now ordered the rubber plugs.
If the pressure is too high, the rubber plugs will squeeze out.....


Golf4, the crankcase internal pressure will never get high enough to push out the plugs. Any excess will vent though the hose which is connected to your air filter housing.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Golf4variant 
Forum Newbie
Posts: 5
Golf4variant
Loc: Nordrhein-Westfalen
Reg: 12-24-17
01-01-18 08:21 AM - Post#2719634    
    In response to raycow

OK. Then everything is clear. I'm curious if the new covers are now tight



 
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