Crossfire t/bdy balancing tool
Thread Starter
Instructor
Joined: Feb 2012
Posts: 117
Likes: 3
From: Eaton Western Australia
Crossfire t/bdy balancing tool
Do any member know where I can purchase a tool for balancing my t/bodies on my 84 Corvette.The t/bodies have been bored and shafts rebushed.I have tried with a home made manometer buthave had no luck.DC have been going to make one but after several e-mails I have not received a reply.Is it possible to get one from else where in the USA,as nobody here in Australia is interested
Cheers
Cheers
Le Mans Master
Joined: Feb 2005
Posts: 6,494
Likes: 566
From: Clearwater Florida
..... Back in the day , I had a Triumph TR6 ... tossed the Strombergs and put some SU's on it ... dual ... I used a length of hose as a stethoscope of sorts , listening at the inlet of each carb and adjusting them to get the same hissing sound from each , worked nicely ... one of the cheapest tools I had ..........
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Do any member know where I can purchase a tool for balancing my t/bodies on my 84 Corvette.The t/bodies have been bored and shafts rebushed.I have tried with a home made manometer buthave had no luck.DC have been going to make one but after several e-mails I have not received a reply.Is it possible to get one from else where in the USA,as nobody here in Australia is interested
Cheers
Cheers
Set them either a/ a feeler gauge or the way I used to do it is to adjust it so that they both close/bind in the bores at the same time...then set the minimum air.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
Don't need the manometer and it probably won't work anyway as boring likely removed the ported vacuum port.
Set them either a/ a feeler gauge or the way I used to do it is to adjust it so that they both close/bind in the bores at the same time...then set the minimum air.
Set them either a/ a feeler gauge or the way I used to do it is to adjust it so that they both close/bind in the bores at the same time...then set the minimum air.
If the ported vacuum port has been removed...using a manometer is useless.
I have one and use it on the Cross-fire engines and it is GREAT...so precise in adjusting.
Adjusting the bored out throttle bodies is quite fun. I have done a few and do not like it when a upgrade is done and an important part of the part is removed.
DUB
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
Don't need the manometer and it probably won't work anyway as boring likely removed the ported vacuum port.
Set them either a/ a feeler gauge or the way I used to do it is to adjust it so that they both close/bind in the bores at the same time...then set the minimum air.
Set them either a/ a feeler gauge or the way I used to do it is to adjust it so that they both close/bind in the bores at the same time...then set the minimum air.
Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Would Tom or Norway please describe the procedure the way you do it?
And how do you know if you should o this or not what will tell you its needed? Just a high idle or other indication?
And how do you know if you should o this or not what will tell you its needed? Just a high idle or other indication?
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
It's needed if you have a drivability issue; high idle, off idle hesitation, etc.
But it's probably needed b/c you just bored the TB's and installed new plates, right? So nothing is the same anymore.
1. Back off the throttle stop until one of the throttle plates just barely starts to stick in the bore.
2.Then use the screw that adjusts the balance between the two, to adjust the second one so that it too, is just barely sticking in the bore.
Now you know, both throttles are darn close to the same angle and are closing off the bores pretty equally.
3. Adjust the throttle stop using the standard "minimum air" adjustment -400 RPM with the IAC ports blocked off or the IAC motors bottomed out.
4. Reset TPS.
Easy-peasy.
But it's probably needed b/c you just bored the TB's and installed new plates, right? So nothing is the same anymore.
1. Back off the throttle stop until one of the throttle plates just barely starts to stick in the bore.
2.Then use the screw that adjusts the balance between the two, to adjust the second one so that it too, is just barely sticking in the bore.
Now you know, both throttles are darn close to the same angle and are closing off the bores pretty equally.
3. Adjust the throttle stop using the standard "minimum air" adjustment -400 RPM with the IAC ports blocked off or the IAC motors bottomed out.
4. Reset TPS.
Easy-peasy.
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Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
I havent done any of that to the tb`s on my 84, yet at least. I read over and over 52mm or whatever they are is plenty.
I do once in a while get where the car falls flat on its face when I hit the gas from a dead stop. Once or twice a week it happens totally unpredictable.
I do once in a while get where the car falls flat on its face when I hit the gas from a dead stop. Once or twice a week it happens totally unpredictable.
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
I havent done any of that to the tb`s on my 84, yet at least. I read over and over 52mm or whatever they are is plenty.
I do once in a while get where the car falls flat on its face when I hit the gas from a dead stop. Once or twice a week it happens totally unpredictable.
I do once in a while get where the car falls flat on its face when I hit the gas from a dead stop. Once or twice a week it happens totally unpredictable.
Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
I like your thinking 
I had a 79 z28 once that would leave two long straight black stripes I dont think the 84 will ever do that, but then again that Camaro wasnt good for over 75 or 80. It had a 350 with 462 heads and an RV cam in it. The only person I knew who wasnt afraid to ride in it with me was my 70 year old mom lol
I had a 79 z28 once that would leave two long straight black stripes I dont think the 84 will ever do that, but then again that Camaro wasnt good for over 75 or 80. It had a 350 with 462 heads and an RV cam in it. The only person I knew who wasnt afraid to ride in it with me was my 70 year old mom lol
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
I like your thinking I had a 79 z28 once that would leave two long straight black stripes I dont think the 84 will ever do that, but then again that Camaro wasnt good for over 75 or 80. It had a 350 with 462 heads and an RV cam in it. The only person I knew who wasnt afraid to ride in it with me was my 70 year old mom lol
I had a 79 z28 once that would leave two long straight black stripes I dont think the 84 will ever do that, but then again that Camaro wasnt good for over 75 or 80. It had a 350 with 462 heads and an RV cam in it. The only person I knew who wasnt afraid to ride in it with me was my 70 year old mom lol
