tii throttle body lever differences: parts book help

[jgerock]

Interesting details on these cars.  I'm betting there were many minor changes made from 71-74. 

 

I had downloaded the parts file from the tii registry (courtesy of Keith Kreeger), but find flipping thru the old parts books enjoyable.  I'd love to find something bound that is in better shape.

Edited August 7, 2018 by jgerock

[Ensign]

I am curious about the holes in my early throttle body that don’t exist in later throttle bodies.

I am intending to use the early version throttle body for an engine build I am currently working on, but wondering how the holes will affect tuning and why they were eliminated in the later versions.

Three of the four holes can be seen in the photos below. The fourth hole is hidden behind the shaft of the eccentric. With the butterfly closed, two of the holes are before the butterfly and the other two are after the butterfly. Any thoughts?

Thanks,

Tony

 

[PaulTWinterton]

4 hours ago, Ensign said:

holes in my early throttle body that don’t exist in later throttle bodies.

 

You can see the extra holes inside the TB? 

 

In theory holes before the butterfly are just unfiltered air added to filtered air.  It shouldn't effect tuning.

 

Holes after the butterfly would allow "uncontrolled" air to enter the system, affecting air/fuel tuning, and vacuum loss.  I believe the only hole should be the re-cycle from the valve cover.

[Ensign]

10 hours ago, PaulTWinterton said:

You can see the extra holes inside the TB? 

yes

[PaulTWinterton]

6 minutes ago, Ensign said:

yes

 

You need someone smarter than me.

[mvliotta]

No holes is my spare TB with the early bits as seen in pics below. Sure that the one in the car is hole-free as well. 

 

Maybe someone one was experimenting with ‘tuning’ and took matters into their own hands??

 

 

[stephers]

Should have NO holes there, if you look close, they look like drilled holes, not machined holes..   Someones backyard idea of tuning.  Fill them with either labmetal or JB weld

[dlacey]

I just checked my 4 spare TBs, 3 different types...none have holes..