Exhaust Shutters 1979 pre-alpha drive

[84EdH]

I am installing new exhaust shutters on my y-pipe separator junction. Does it matter which orientation the shutters are installed ie. pivot verticle, pivot horizontal etc. ?

Ed

 

[NHGuy]

Re: Exhaust Shutters 1979 pre-alpha drive

If they are like mine they only go in well with the pivot horizontal because the holes in the pipe are across from one another.
Also they look completely different from the old style ones I took out. As I recall there is a nice instruction page in the package.
I am a male so I hate to admit this, but sometimes I use the instructions.

 

[84EdH]

Re: Exhaust Shutters 1979 pre-alpha drive

mine came as separate oem pieces: shutters, o rings, retainer sleeves....no instructions

I will have to test them to see why horizontal is better....I cant think why without seeing....

thanks for the info!

 

[NHGuy]

Re: Exhaust Shutters 1979 pre-alpha drive

So if you have the oval shaped ones I can give you a little insight. There are probably little teflon bushings that go in the holes. There are shafts which go through the holes in tabs on the shutters. Those shafts sit on the bushings and pivot to allow the shutters to open and close. Look at the old ones, maybe they are still there and you can copy how they are in there. You orient the shutters so that when the exhaust gases hit them it pushes them open. One side is bigger, that side goes down with acceleration. And conversely if any water backs in there from a big wave or a throttle chop it will close them off.
Once you "get it" you will think, oh yeah, that's how they work.

 

[84EdH]

Re: Exhaust Shutters 1979 pre-alpha drive

NH thanks for the info. mine are the oval type, however, both halves are same size. they seem to work whether retain ring holds them at any angle. I will do as you suggest and see which way the old ones were in there and duplicate.

Ed