Whats this hole for?

[Nickharding]

Image pinched from "Wocka"'s post, hope you dont mind.


The hole underneath a 172 inlet manifold? .. Going to be cutting one up shortly to use the plenum for a R5 GTT Fuel injection conversion, but didnt know this hole was here, whats it for as i will have to weld a plate over it?

Cheers.

 

[Jaff.]

think its for idle control mate. on my k4m the air comes in, up to the trottle body and ICV, through the ICV, then a pipe into the top of the rocker cover, then out of the rocker cover through your hole into the inlet pipes.

K4M seems to have the same sort of setup as the F4R, so i should imagine it serves the same purpose

 

[Nickharding]

Brill, Thanks mate.

Will just cut the bracket off the back, straight through the hole, then make 2 plate bits to weld over the hole to keep it square.

Thanks dude.

 

[Jaff.]

no worries mate

 

[Fred@BTM]

nothing to do with idle control, its the vac feed for the carbon canister/oil breather plate

 

[Jaff.]

diffrent on a k4m then? or have i completley misunderstood how my engine works lol?

 

[sideways danny]

diffrent on a k4m then? or have i completley misunderstood how my engine works lol?

k4m works the same as the f4r. you've got it wrong lol

 

[Jaff.]

k4m works the same as the f4r. you've got it wrong lol

*goes out too look at my engine*

second thoughts ill look tomorrow its snowing!

 

[Nickharding]

Let me know fella.

 

[Donny_Dog]

hole for the oil breather.

 

[chris_182]

weeman would know

 

[elandman]

its the oil breather....
oil breather setup from my k4m ... after some cleanup and headwork i did

 

[Nickharding]

Thanks alot mate, Does the hole go straight through into the plenum? or does it come to a dead end?

 

[Jaff.]

its the oil breather....
oil breather setup from my k4m ... after some cleanup and headwork i did

mines diffrent to that so i supose thats where my confusion lies...? ignore me in that case lol

 

[Goodj]

thread had scope for much amusement, but delivered none.

 

[sideways danny]

mk3 clio/twingo K4M is quite different to the earlier engine.

The hole in the F4R plenum is primarily for the vacuum take-off that goes to the carbon canister. There's also a pin hole sized oil breather.

 

[Nickharding]

Does the hole go into the plenum? or is it a dead end?
If it goes right through il have to weld it up.

 

[sideways danny]

it's an opening into the plenum

 

[Nickharding]

ah right, Thanks Dan!

 

[franx]

thread had scope for much amusement, but delivered none.

chris_182
Re: Whats this hole for?

weeman would know

 

[wocka]

Yeah i dnt mind buddy, i also wonderd what this was for