Jump to content
Ultimate Subaru Message Board
justajester

air suction valve manifold?

Recommended Posts

Hey guys, on my 82 brat i still have my non functioning air suction valve. I was planning to remove it and noticed it is attached to a manifold bolted on to the exhaust port on the engine. Can i remove the whole thing, manifold and all and just bolt my exhaust directly to the engine?

Share this post


Link to post
Share on other sites

Do you have the suction adapter on just one side or on both?  If on both, then I am pretty sure that the answer is "yes".  If on one side, the exhaust manifold is unlikely to flex enough for you to get the nuts started, let alone get a good seal.

Share this post


Link to post
Share on other sites

You have to leave that ASV spacer in there unless you swap the Y-pipe from an EA82 in. Just not enough pipe above the bend for the EA81 Y-pipe to fit with out some serious rubbing, if it would fit at all.

 

You can cut the tubes off next to the flange nut and weld a piece of metal over the end.

If,, the nut holding the tube will come out, remove the tubing, cut it and keep the nut. A quarter placed in the port, then the nut will do nicely to close it also.

Share this post


Link to post
Share on other sites

It just has it on the passenger side. The other pipe is bolted directly to the engine. If it seems to flex will it work like that or am I better off cutting off the valve and shoving a quarter in like mentioned elsewhere in the forum?

Share this post


Link to post
Share on other sites

Yep. EA82 Y-pipe will bolt directly to the EA81 heads. Currently running an EA81 in my '88 Wagon originally an EA82, same Y-pipe, just no ASV spacers on the EA81.

Share this post


Link to post
Share on other sites

oh, one other question since it is pretty close to the same topic. I'm switching to the weber carb and there is the tube that comes of the exhaust just below the ASV and runs up to the air cleaner. What do I do with that hole? I won't be using it anymore....does the Ea82 pipe have that?

Share this post


Link to post
Share on other sites

oh, one other question since it is pretty close to the same topic. I'm switching to the weber carb and there is the tube that comes of the exhaust just below the ASV and runs up to the air cleaner. What do I do with that hole? I won't be using it anymore....does the Ea82 pipe have that?

You don't need to do anything with the "hole" in the exhaust pipe.  It doesn't actually open into the exhaust pipe.  It's just a heat stove to draw air across the hot exterior of the exhaust pipe into the air cleaner box to aid in cold warm-up.  A carbed ea82 pipe will likely have the same feature.

Share this post


Link to post
Share on other sites

Currently running two EA81s with EA82 Y pipe

 

EA82 Y pipe with cat and O2 sensor bolted to EA81 with those cast iron extenders on exhaust ports and

 

#2 carbed, catted EA82 Y pipe on non extended std EA81 heads is a very tidy and tight fit.

 

Thinking those holes with thread on pollution pipes, think it can be successfully plugged witha std spark plug for convenience :)

Share this post


Link to post
Share on other sites

Unscrew the big flange where the metal tube goes into the ASV box (behind the head).  It's big stainless flange, ussually never seized.   Unscrew it, place a Quarter (US money) in the hole, and reattach the flange. 

 

Done. The exhaust passage is blocked. now remove all the plastic tubiing coming off the ASV.

Share this post


Link to post
Share on other sites

I dont have one right now unfortunately, but, on the passenger side where the exhaust pipe attaches to the engine you will see a little aluminum manifold with a pipe coming off of it. That pipe leads up to the asv. Unscrew the pipe at that manifold then follow it up to the asv and unscrew the two screws holding that in place. Shoge a quarter in at the manifold and reassemble.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×