i m installing this a14 engine, but i want to know what append if i bock this hole.

the hole is conected to the exaust manifold.

that hole looks like it's part of the cooling system. maybe it goes to the intake manifold, if so then you might be able to block it.

why do you want to block it?

no, this hole is to inject air into the exaust manifold to help the burn. but i have taken the sistem out and gonna block it, but first i need some advice.

I've never seen a hole there on any other A series.

So I'd say you should be fine to block it up

unless it's something i've never seen before


appears to be a coolant passage, the exhaust manifold is on the otherside of the engine. on my air injection system, the air went directly in to the exhaust manifold, that would be really odd if the air went inside the head to the exhaust manifold.

i think i've seen water outlet gaskets with that passage, i can't imagine it being anything other than a coolant passage.

Nah, it's the air inlet for the air injection system & blocking it should not harm anything, but blocking the holes in the inlet ports would probably be better as the four exhaust ports are connected through these ports & there will now no longer be cold air passing through them. I have no idea if there could be any long term disadvantages, although there are probably none.

Yep, that is the air injection port for one of the emission controls. I have a head just like that sitting on my parts shelf.

You will absolutly want to block the port or you will get exhaust coming out where you don't want it...

The only concern I have is the fact that you will have hot exhaust traversing back and forth between the 4 exhaust ports inside this passage. May increase the heat load on the cooling system some...

Each exhaust port has a ~8mm hole that connects to the passage that is visble in the pictures.

Back in the early 80's a friend of mine was tweaking on a Toyota 20R or 22R motor. It had similar air injection ports as the ones in the A14 head. Blocking the air inlet kept the exhause under controll but the air ports in the exhaust port pockets caused the exhaust to have a strange whistle to it. His fix was to have the air injection ports in the exhaust ports welded shut.

Gary

why do they do that on the A14? that's such an odd way to do the air injection.

The reason they put the air injection through the head is lack of room to place in each exhaust runner. you may find a core plug the right size to plug it with.