Pcv valve do I need one?

[djmakko]

87' mercruiser 260/5.7 alpha I gen I
I'm in the final details of my engine installation last thing flame arrestor , I know
Needs crankcase ventilation should I install a Pcv valve or just
Leave the holes just with the hoses conected to the flame A. I also have a vacuum valve coming from
The Holley 600 wonder if I should put one hose there to the ventilation hole.

 

[achris]

Re: Pcv valve do I need one?

Marine engines (pre-emission control laws) don't use PCV valves. Just use the hose as Merc intended it. As for the vacuum port on the Holley? It that a PROPER marine carburetor?

Chris.......

 

[djmakko]

Re: Pcv valve do I need one?

Marine engines (pre-emission control laws) don't use PCV valves. Just use the hose as Merc intended it. As for the vacuum port on the Holley? It that a PROPER marine carburetor?

Chris.......

Engine came with this Holley 600 4150 carburetor from Doug russel better be marine. How can one tell if meet marine specs?

 

[Eric 3.7LX Alpha 1]

Re: Pcv valve do I need one?

That port may be for the clear hose which runs down to a mechanical fuel pump, if you have one, to show if the diaphragm fails.

 

[achris]

Re: Pcv valve do I need one?

Should have a tag on it to indicate marine, or use the model number of the carb and check against Holleys website... If you can spring the coin, ditch the Holley and get an Edlebrock 1409... Much better in a boat.

 

[achris]

Re: Pcv valve do I need one?

That port may be for the clear hose which runs down to a mechanical fuel pump, if you have one, to show if the diaphragm fails.

Good point. Where's the connection on the carb, near the top or near the bottom?

One of the easiest ways to tell is the vent of the float chamber. Is it straight up (non-marine) or is it curved and pointing down the barrels (marine)?

 

[djmakko]

Re: Pcv valve do I need one?

Good point. Where's the connection on the carb, near the top or near the bottom?

One of the easiest ways to tell is the vent of the float chamber. Is it straight up (non-marine) or is it curved and pointing down the barrels (marine)?

The port is near the bottom next to the choke and its straight , I have an electrical fuelpump , when I started the engine ran a little rough put my finger on the port and ran smooth , so I put a plastic plug on it , but still confuse on wether should be connected to something , I also have another port coming from top near the linkage throttle. assembly but that one was plugged with a plastic cap like I did with the other one .

 

[achris]

Re: Pcv valve do I need one?

Is the float chamber vent tube vertical or curved?

Marine Holley -> Holley Model 4150 Marine Carburetor 4 BBL 800 CFM Mechanical Secondaries 0 9022 | eBay

Non-marine Holley -> 600CFM MODEL 4150 CARBURETOR HOLLEY 0-4776C on eBay!

See the curved tube on the marine one? and the straight one on the non-marine?

 

[djmakko]

Re: Pcv valve do I need one?

It's curved, so it's marine yeiiii , but I was talking about the vacuum port next to the choke , should I plugg it or connect it to the vent hose from valve cover

 

[Eric 3.7LX Alpha 1]

Re: Pcv valve do I need one?

The valve cover vent runs to the flame arrestor not the carb. Leave it plugged off.

 

[djmakko]

Re: Pcv valve do I need one?

Got it , thanks for your help Chris. Hope you become the next oracle by the sea!

 

[djmakko]

Re: Pcv valve do I need one?

Thanks Eric.

 

[achris]

Re: Pcv valve do I need one?

Got it , thanks for your help Chris. Hope you become the next oracle by the sea!

Thanks for the thought, but that title is due only one man....
R.I.P Don.