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Username Post: valve cover had an open hole and the shop connected the draft tube to it?        (Topic#346338)
Eric_Gary132 
Contributor
Posts: 203

Age: 24
Loc: northern California
Reg: 01-27-17
08-01-17 02:03 PM - Post#2702348    

There is a tube that comes out of the top of the back of my 283 engine where all the spark plugs meet.

this tube was formally bent downwards and was leaking on top of my starter or at least we think it was.

the shop went ahead and took this tube and bent it upwards to the top where the valve cover is and connected the tube to the valve cover hole.

the tube on my truck looks similar to this one below, it comes out from where the spark plugs meet:

https://www.corvetteforum.com/forums/attachments/c...

Is that a smart Idea or is the shop going to damage my engine by doing this?



Edited by Eric132 on 08-01-17 03:16 PM. Reason for edit: No reason given.

 
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TAT_2 
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08-01-17 03:08 PM - Post#2702360    
    In response to Eric_Gary132

KANT USE THE LINK,I WAS BANNED

You have been banned for the following reason:
Inappropriate image posting, second offense

Date the ban will be lifted: 08-19-2017, 12:00 PM




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sidworks 
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sidworks
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08-01-17 05:21 PM - Post#2702378    
    In response to Eric_Gary132

  • Eric132 Said:
There is a tube that comes out of the top of the back of my 283 engine where all the spark plugs meet.

this tube was formally bent downwards and was leaking on top of my starter or at least we think it was.

the shop went ahead and took this tube and bent it upwards to the top where the valve cover is and connected the tube to the valve cover hole.

the tube on my truck looks similar to this one below, it comes out from where the spark plugs meet:

https://www.corvetteforum.com/forums/attachments/c...

Is that a smart Idea or is the shop going to damage my engine by doing this?


I doubt that they bent the tube up and used it as you describe. what they did was remove the old road draft tube and installed a hose with a PCV valve which all become mandatory in the next few model years
ron


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raycow 
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Loc: San Francisco, CA
Reg: 11-26-02
08-02-17 12:41 AM - Post#2702421    
    In response to Eric_Gary132

The hookup in your pic was pretty much the stock setup in the early years of PCV (up to about 68 or so). Some builders adapted it to the earlier engines which did not have PCV from the factory because those engines originally had their draft tube installed there. Later engines (after about 68) no longer had that draft tube port in the block, so the PCV was connected to the valve cover instead.

PCV is a good idea for any engine. It reduces oil contamination and condensation which can cause corrosion in the crankcase. There is no real downside to it other than the occasional maintenance the PCV valve requires.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 
Eric_Gary132 
Contributor
Posts: 203

Age: 24
Loc: northern California
Reg: 01-27-17
08-02-17 06:03 AM - Post#2702445    
    In response to sidworks

That sounds exactly like what they did. They used a pcv valve and connected a tube to it and stuck it in the valve cover hole.

The origin of the tube goes to the back of the block where the distributor is at. That's where it comes from.

So I'm guessing that is where the draft tube comes from? If this is the case, then they did in fact plug a draft tube into the valve cover hole.



Edited by Eric132 on 08-02-17 08:47 AM. Reason for edit: No reason given.

 
Bel Air kiwi 
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Reg: 04-24-14
08-05-17 05:01 AM - Post#2702902    
    In response to Eric_Gary132

Hi Eric. That hole into the block beside the distributor for a draft tube is a vent.
So is the port in the rocker cover. Looping a pipe between them doesn't make it a PCV system.
It needs to go through a PCV valve and into the carb or intake to be a real PCV.

If you can't post pictures email me your image and I'll post it for you.

Cheers Kiwi



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jktucker92 
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Reg: 02-05-17
08-11-17 02:38 PM - Post#2703789    
    In response to Bel Air kiwi

I can corroborate Bel Air Kiwi's statement. My '66 Impala had a 327, and that port in the back was used for a PCV valve as stock. There was a rubber hose that connected to that port in the back, then to a PCV valve that sat between the valve cover and the carburetor on the passenger side, and then to the PCV port that is in the front of a quadrajet, just under the fuel filter. As mentioned above, the PCV valve just needs to connect to that port, and then to the PCV port on the carburetor. Later on (68?), the PCV valve was put into the valve cover, and the port in the back wasn't machined in the block. If you have aftermarket valve covers with a PCV valve already there and to the carb, you can block off the port in the back. Some carburetors have the PCV port in the back. In that case, you need a port that is angled up so that it can get past the intake manifold.



 
Eric_Gary132 
Contributor
Posts: 203

Age: 24
Loc: northern California
Reg: 01-27-17
08-12-17 02:04 PM - Post#2703893    
    In response to raycow

Ray, the shop connected the hose from the draft tube port into the open hole on the valve cover of my engine.

heres a pic of the open hole before they did this, I circled it in red with an arrow pointing to it.

http://ibb.co/h2iCGa

before this, this hose was hanging beside the engine and leaking some oil on the ground,

now the engine has been running rougher and also something that never happened was when the mechanic started it up for us, the engine turned for like 3 or 4 seconds. it NEVER used to do that until they connected that draft tube port to the hole in the valve cover, and we started this truck up about 100 times and it would start in less than 1 second, even in cold climate.

This shop says they work on old cars and new cars, but they've only been in business for four years, so im not sure if they know what they're doing or not.



Edited by Eric132 on 08-12-17 02:11 PM. Reason for edit: No reason given.

 
raycow 
Honored Member
Posts: 26693
raycow
Loc: San Francisco, CA
Reg: 11-26-02
08-12-17 02:47 PM - Post#2703896    
    In response to Eric_Gary132

Maybe you need to start looking for another shop, and don't stop looking until you find one which knows what they are doing.

Connecting a hose from the draft tube port to the valve cover does absolutely nothing useful. The hose from the draft tube port should connect to a PCV valve and then from the valve to the carb or the intake manifold. For clean inlet air to the crankcase, run a hose from the valve cover to the carb air filter.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 
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