Triples and PCV Valve

[Scoota G]

My car lives outside at the moment and starting it up in the morning has meant a little condensation in the motor and i didn't have a PCV valve fitted because of the triples.

I must admit that it was entertaining watching the panicked look on peoples faces as i pulled up at the lights with the Volcano Effect from under the bonnet.

 

So i drilled into one of the T Pieces that runs the brake booster vacuum and tapped it out to suit an adaptor to fit the PCV valve. I heard it mentioned in a thread a while ago and thought i would pass on the info.

 

 

[luvemfast]

Feel a little naive to ask but.

What is a PCV? (I think pressure control valve) And what does it do with triples? Why is it needed?

I have triple Mikuni's to go on soon. Need to know more info from others experiences.

 

[260Coupe]

The PCV is the Positive Crankcase Ventilator valve which vents the block to the inlet manifiold, this one way valve draws gases and pressure from the crankcase into the inlet manifold for combustion.

Follow the hose on the left of the block up to your inlet manifold, you will find the PC valve in the balance bar between the two inlet manifolds.

 

The problem is once you go to triples there is no facility to vent the crank into the inlet manifold, equally acrros the cylinders (no balance bar) most install a catch tank and vent the crank and rocker cover into this.

The danger of venting to the brake booster is the danger of loosing boost pressure after multiple hard stops.

 

cheers

 

Alan

[luvemfast]

Righto, thanks Alan.

I knew of this, just not the correct names of them.

I was thinking of going the catchcan option with the vent from the top of the rocker cover aswell.

[Zeddophile]

I was thinking of going the catchcan option with the vent from the top of the rocker cover aswell.

 

Catchcan is a much better solution, as you don't end up with all that carbony gunge going into your motor... If you've ever looked inside an intake manifold or on some cars around the throttle butterfly, and seen black sticky crud everywhere, thats where it comes from.  Much healthier for the engine not to be breathing that.