PLENUM CHAMBER 350i s2 - should this be capped?

[TonytheTVR]

Hi all,

Noticed an open, uncovered, inlet or outlet hole on the underside of my 350i plenum chamber, see pic below.
Can anyone tell me why it's there? And should it have a blanking plate over it?

I guess it's part of the plenum "hotspot" chamber I've read about?

As the car is a recent project and hadn't been driven for many years st the point I bought it, but it started and ran ok but was only driven a few yards prior to my resto starting.

Appreciate your views.

Cheers
T

[rev-erend]

Pretty sure that is the water heater. Heating a plenum is not a good idea. Less bhp ..

[TonytheTVR]

Hi,
Thanks, guess it just needs a blanking plate on it then?
T

[sixor8]

There's no need to blank it off, there should be no air passage through to the intake.

Chimaera and Griffs have two pipes in the same area, they are just left open to the air in TVR's application. It was there for water heated intake to prevent icing on Rovers / Land Rovers, but due to the long induction route on TVRs, not deemed necessary it seems.

[TonytheTVR]

Grest. Cheers!
T

[jon haines]

I took that plate of and sealed it to give more room to remove the rocker cover without having to take the plenum off. As others have said not required.

[jon haines]

I have removed this from the plenum to create more space to remove the rocker cover without having to remove the plenum plus it is not required.