Shutter Valve
#1
Full Member
Thread Starter
Join Date: May 2005
Location: Clarksville TN
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
Shutter Valve
The car is idling funny and I am trying to replace one part at a time to figure out what is causing this Shutter valve is there another name for this can't seem to find it in any of the auto parts stores
#3
Old [Sch|F]ool
All carbureted converter cars had the shutter valve. This means '81-85 12A.
You don't want to remove everything, because the butterfly is actually necessary for proper flow in the intake port. (Removing it alters the port volume and area drastically, in a bad way) if you had to you could just disable the hoses, or (pain in the *** way) remove the unit and wire the butterfly open.
You don't want to remove everything, because the butterfly is actually necessary for proper flow in the intake port. (Removing it alters the port volume and area drastically, in a bad way) if you had to you could just disable the hoses, or (pain in the *** way) remove the unit and wire the butterfly open.
#5
Rotary Freak
Join Date: Sep 2002
Location: SF BayArea
Posts: 2,815
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by peejay
All carbureted converter cars had the shutter valve. This means '81-85 12A.
You don't want to remove everything, because the butterfly is actually necessary for proper flow in the intake port. (Removing it alters the port volume and area drastically, in a bad way) if you had to you could just disable the hoses, or (pain in the *** way) remove the unit and wire the butterfly open.
You don't want to remove everything, because the butterfly is actually necessary for proper flow in the intake port. (Removing it alters the port volume and area drastically, in a bad way) if you had to you could just disable the hoses, or (pain in the *** way) remove the unit and wire the butterfly open.
B
#7
Senior Member
Join Date: Apr 2004
Location: South Jordan UT
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by bliffle
I just plugged the hole in the bottom of the air cleaner: works good. I worry tho, that it may have decreased my gas mileage.
B
B
Trending Topics
#8
Old [Sch|F]ool
Originally Posted by pratch
Easiest way is to just gut the emissions if you're exempt.
#9
All carbureted converter cars had the shutter valve. This means '81-85 12A.
You don't want to remove everything, because the butterfly is actually necessary for proper flow in the intake port. (Removing it alters the port volume and area drastically, in a bad way) if you had to you could just disable the hoses, or (pain in the *** way) remove the unit and wire the butterfly open.
You don't want to remove everything, because the butterfly is actually necessary for proper flow in the intake port. (Removing it alters the port volume and area drastically, in a bad way) if you had to you could just disable the hoses, or (pain in the *** way) remove the unit and wire the butterfly open.
#10
Old Fart Young at Heart
iTrader: (6)
Peejay's right, removing the shutter valve entirely changes the cross sectional diameter of that port runner. This causes an imbalance between it and the front one. You either leave the shutter valve in and locked in the open position or port the other runner, which takes a flow bench to get right.
#11
My 7 is my girlfriend.
iTrader: (5)
Join Date: Feb 2006
Location: London, Ontario, Canada
Posts: 3,162
Likes: 0
Received 1 Like
on
1 Post
Peejay's right, removing the shutter valve entirely changes the cross sectional diameter of that port runner. This causes an imbalance between it and the front one. You either leave the shutter valve in and locked in the open position or port the other runner, which takes a flow bench to get right.
I don't quite understand this. I know that the area around and just below the butterfly is of a larger diameter, however it narrows below that to the same size as the front rotors runner. So in reality it should flow no more than the front runner. You could remove the butterfly and bore out the other runner to the same size. I plan to try this with my current mani, but I will also be grabbing a junkyard one soon, incase it doesn't work out I'll have one thats just fine I can throw back on.
#12
SHUTTER VALVE. My experience with this: RX-7 (1982) would not go over 45-50 mph. The whole prolbem started when it started dying at stop signs, but would start up right away again. Loss of power. ANYWAYS - finally removed carburetor. The butterfly valve was stuck closed under the carburetor - SHUTTER VALVE was stuck. Large hole (hose up to air cleaner) that is on shutter valve was crusty and full of crude inside hose. I considered removing shutter valve, but gently nudged it open and gently worked shutter valve back and forth and disconnected shutter vavle HOSE for now. I left shutter valve and butterfly valve intact and connected. Put carburetor back on and drove car....problem solved. I believe the closed valve actually had the car running on one rotor, RIGHT? THANKS
Thread
Thread Starter
Forum
Replies
Last Post
ls1swap
3rd Generation Specific (1993-2002)
12
10-01-15 07:58 PM