Throttle body diameter?
 

Does anyone know the diameter of each throttle body? I think I remember 52mm, but I can't remember for sure. Thanks

I believe they're around 53-54mm.
-Bill

My spare set here have an ID of about 62mm...that's EACH!

They flow some serious air!

Matt

Okay, I actually went out the garage and measured one of my spare TB and it's right there with Matt's -- ~63-64mm dia (each!)
Airflow through the TB is really not a problem;)
-Bill

For those that are curious, dual 64mm throttlebodies is the same as a single 90mm throttlebody.

David,
fixed your post.;) :D
-Bill (72mm2 up on a 90mm TB)

ok...well 90.5mm to be more precise.

:D :D :D :D :D
-Bill

Actually I would expect that our dual throttle bodies are much better than a 90mm throttle body. A 90mm (3.5 inch) throttle body opened 35% will let a lot more air through than dual 63mm (2.5 inch) throttle bodies will at 35%. This means you get a more linear throttle application with the duals than you would the single.

To bad we have a crappy idle control valve that is expensive as heck to replace. :(

:confused: :confused:
35% of 2 64mm TB = 2,252 mm2
35% of 1 90mm TB = 2,227 mm2
-Bill

Fixed it for ya :p :cool:

David,
yeah, every 0.5mm helps!:D :D
-Bill

Yes but its only 50% of 90mm, till it gets to 4000, then its 100% of 60mm.X2.
Just thought I'd clear this up.:confused:

Harvey.:)

To clear this up you should make a statement which is clear and emphatic. 4000:confused: RPM :confused: Just what is inferred in exact terms and what is the point :confused:

The full throttle areas in both cases are little different. 90 mm = 6361.74 2x 63 mm = 6234.5. It is also difficult to establish anything of advantage one way or the other, in respect practical linear throttle operation.

35% TPS reading does not mean that 35% of the surface area of the TB is open. It means that the TB plate is just over 1/3 of the way open. Technically you never have all of the surface area because of the shaft.

The larger the diameter, the faster the Airflow/%TPS ratio increases.

Please correct me if I'm wrong as I am definitely not positive about this, however experience has shown this to be true.