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Removing my vacuum spray pump

ClearAction

ClearAction

Active Member
May 17, 2011
154
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Rye, East Sussex
www.southwestunderground.net
Hi, I've started a new thread as my old one about a split breather hose has now gone on to this topic. Here is my current breather system - the suction pump has a small L shaped hose not shown that goes upwards to the intake manifold.

http://i4.photobucket.com/albums/y127/patb303/PCV/IMG_0255.jpg

Here is the breather hose kit I have bought - you can see that the suction pump and brake booster line are gone.

http://i1057.photobucket.com/albums/t399/Clear_Action/20032012237.jpg

Finally here is a thread where some people have done away with the suction pump (as it is prone to both boost and vacuum leaks) and brake booster hose (which installing an oil catch can removes anyway)

http://forums.vwvortex.com/showthre...come-take-a-look.-suction-jet-pump-058133753B

So I am thinking of just using my kit to make a direct route from the PCV valve (in the T junction) up to the intake manifold. I think some Golfs were set up like this as standard? As far I can read from the forum link the pump acts as a valve which opens and closes under boost or vacuum and also helps to atomize vapours further. With no brake booster line it's use seems limited and I will be able to get away without it?

If anyone can let me know their opinion would be helpful thanks!
 
Take it out, jump on it and bin it, if you fit a catch tank it all goes in the bin anyway. As long as the brake hose is still attached to the vacuum pipe at the end of the manifold your all good. Have a look HERE its a guide i did for fitting a catch tank, and shows you all you need to keep, i know your not fitting the catch tank but it will give you an idea what you need to do to fit your hoses.
 
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oh nice! I'm pretty convinced that I can drop that brake booster line now! I've seen the guide that says to plug the y piece with nylon pipe and jubilee clip - any other ideas for plugging - and then - what diameter hose to make the new section please?

I'm still worried that taking the spray pump out might mean the vapours are less 'refined' in terms of dispersion or consistency? what you rekon anything to worry about or is it all about containing leaks? I know its all going to gunk up the intake eventually anyway but for now I'm willing to keep on top of maintainance
 
Just remove the "Y" piece and connect the brake pipe directly to the outlet on the manifold, then all you need to do is make a cap for the port under the manifold. Removing the spay pump wont change the consistency as all that's coming from the crank is vapour, its as it hits cooler air that you get the gunk build up. I think its 8mm silicon you will need.
 
ok thanks philc you passed that test! Just one more ask then?
So without the pump - just the straight hose, the PCV valve in the T piece blocks the vacuum from the intake mani which would usually have been be routed by the vacuum pump to the brake booster? Then under boost, the PCV lets through pressure from the intake mani to join the rest of the breather vapours travelling all the way up to the hockey puck accum valve - which the old suction pump would have closed off from the brake booster line!

The only reason for the intake mani to pcv valve connection is to keep MAF readings etc happy then?

When you say remove the Y piece and directly connect the brake pipe - I need to keep that other check valve in the line still then......

enjoy..... :happy:
 
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Post from another forum:

''This jet suction pump don't create vacuum under boost but when you close the TB. Your motor becomes a suction motor and you get vacuum in IM. Now this pump help open the PCV valve to suck gasses out of head and assist brake boosting. Has no function under boost other than to keep PCV valve closed. ''
 
No the PCV has nothing to do with the Maf. You don't need to have anything helping the gasses to flow from the crank or the head the engine creates its own pressure, as i said when a catch tank is fitted you remove all the pipes except the one from the crank and the one from the cam cover, so you have the two feeds into the catch tank and the one out let which can go to the TIP or vent straight to atmosphere. Yes you need to keep at least one of the non return valves in the brake servo line.
 
Here is my decision! - :blink:

The suction pump's main use is to intensify the natural vacuum from the intake manifold (small L hose) to the brake booster (and maybe the breather system aswell)....

it also seems to have a check valve inside that diverts vacuum between brake booster line and the PCV valve when boosting (not sure which one it goes to under boost- I'm thinking brake system under boost? breather under idle?)

So by taking it out I am making the vacuum always go towards the PCV and breather system but at relatively lower intensity of vacuum than before - and obviously removing the additional brake booster line which we have agreed I can do without.

So as long as the breather system doesn't mind having a change in the amount of vacuum assist it is getting.........though under boost I don't think it was getting any (going to brake line).....I'm good!

Big thanks to Philc for the help I handed you some rep somewhere - I'm not a huge car geek but do like to know what I'm doing!

One thing though the brake line to replace the t piece looks smaller than 19 mil, I thought 19 mil was the fat Y 'chocolate' piece. Or are they the same size just me being an idiot :funk:
 
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