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Suggest an oil filler for my ZZ6 crate please

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Old 09-15-2018, 05:15 PM
  #21  
Kie
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Default vacuum connections at carb... all look correct


On the left (smaller hose) is heater system vacuum. My headlights lift electrically now. On the right (larger hose) is my pcv.

Brake booster hookup.

Dizzy vacuum advance

Can you spot the repurposed Ducati part?
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Old 09-15-2018, 05:26 PM
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Default Holley vacuum diagram for blanks and giggles

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Old 09-15-2018, 06:09 PM
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No. But I do see a allan head NPT pipe plug at the rear of the intake maybe. If it were mine, I would get a single brass 90* fitting and run the PCV hose to that. In my opinion, that would force oily residue into the intake and away from any carb parts, instead of the way you have it now. I have never liked the idea of introducing blow-by into a carb via an air cleaner base or a throttle base plate. I know its been done for decades but no carb needs to lubricated with oil by-products, IMHO.

Last edited by HeadsU.P.; 09-15-2018 at 06:10 PM.
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Old 09-15-2018, 07:30 PM
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Originally Posted by HeadsU.P. View Post
No. But I do see a allan head NPT pipe plug at the rear of the intake maybe. If it were mine, I would get a single brass 90* fitting and run the PCV hose to that. In my opinion, that would force oily residue into the intake and away from any carb parts, instead of the way you have it now. I have never liked the idea of introducing blow-by into a carb via an air cleaner base or a throttle base plate. I know its been done for decades but no carb needs to lubricated with oil by-products, IMHO.
Thank you for all the input on my little issue. Help me understand please. As far as I can tell that by hooking up my PCV as GM and Holley have advised me to with their products... there is no oily residue getting into the carb inner bits. The port is after or beneath the carb. Doesn't that mean the oily air is getting sucked straight into the intake manifold on it's way to combustion without going through the carb?

By the way the Ducati bike part is the sano rubber tie wrap on the fuel rail securing the choke wires and vacuum lines. I drive the local Ducati shop parts guy crazy as I like using them for all sorts of stuff.
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Old 09-15-2018, 07:31 PM
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Look a motorcycle part!
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Old 09-15-2018, 07:39 PM
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FYI....it does not matter one bit which side the PCV and Breathers are on.......
Use a Mr. Gasket baffled rubber grommet to help with the seepage you are getting.

Jebby
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Old 09-15-2018, 07:55 PM
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Originally Posted by Jebbysan View Post
FYI....it does not matter one bit which side the PCV and Breathers are on.......
Use a Mr. Gasket baffled rubber grommet to help with the seepage you are getting.

Jebby

Awesome thank you! This one? The Mr G 5425?

https://www.oreillyauto.com/detail/b...t/5425/4514208
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Old 09-15-2018, 07:58 PM
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Originally Posted by Kie View Post
Awesome thank you! This one? The Mr G 5425?

https://www.oreillyauto.com/detail/b...t/5425/4514208
Yes!

Jebby
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Old 09-15-2018, 08:06 PM
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Originally Posted by Jebbysan View Post
Yes!

Jebby

In stock at my local Oreillys thanks my friend!
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Old 09-15-2018, 09:16 PM
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Post #22 also shows (incorrectly) to run the dizzy vac adv hose to the "timed port". Everybody knows not to do that.

I'm just saying I prefer not to introduce oily by products anywhere near my Holley primary throttle. I have seen what blow-by does to intake plenums. It turns them black.
So, IMHO its much wiser to use the NPT vac port on the number 8 intake runner that almost every intake has. Let cyl #8 burn that crap off.
But hey, its your engine. You can follow the rules or break them.

This winter I plan to install a oil catch can between the PCV and the intake vac port.
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Old 09-15-2018, 09:34 PM
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Where should my vacuum advance hose go then ?
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Old 09-15-2018, 09:46 PM
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Avid Hot Rodders know that the dizzy should receive FULL vac from a full vac port, at the front of the carb. Then move your PCV hose to the intakes rear NPT plug using a 90 degree brass or chrome fitting. All your contaminated crud will be burned off with the intake runner to # 8 cyl.

I believe I saw your intake manifolds vac plug in the photo. Appears to be an allen head plug?

Last edited by HeadsU.P.; 09-15-2018 at 09:55 PM.
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