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post #1 of 27 (permalink) Old 07-20-2011, 06:43 PM Thread Starter
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Bored Throttle body

Just came in the mail today from MaxBore. I'll get it measured up later for a finish diameter. Bore finish and throttle plate fitment look pretty darn good.



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post #2 of 27 (permalink) Old 07-20-2011, 06:50 PM
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Looking good Art...when you going to put it on?



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post #3 of 27 (permalink) Old 07-20-2011, 07:02 PM
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No gaps!
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post #4 of 27 (permalink) Old 07-20-2011, 07:08 PM Thread Starter
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Probably after this damn heat wave. Correct Doug, no gaps. It would have been nice if they had included a note with the finished diameter, but thats what they make calipers for
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post #5 of 27 (permalink) Old 07-20-2011, 09:17 PM
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Nice product you have there, the limiting factor is the wall thickness for the dang elbow. I made my own 70mm TB and polished the crap out of that wall thickness until I was comfortable yet not too thin.

Late!
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post #6 of 27 (permalink) Old 07-20-2011, 11:41 PM Thread Starter
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It's 70mm, thats all you can get out of these newer ones. I could probably polish it a bit, but it isn't going to make that big a difference so I'll just be happy with it the way it is.
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post #7 of 27 (permalink) Old 07-21-2011, 12:56 AM
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I think it was Maxbore that I sent my TB to. They had horrible communication skills and it really didn't look like they did much. Faced off the inlet lip and straight bored the opening to the butterfly diameter
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post #8 of 27 (permalink) Old 07-21-2011, 07:00 AM Thread Starter
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MaxBore makes a new butterfly for it after it is bored. It is straight bored, measures 70mm on both sides, not much room to taper the bore on the inlet side, if you take anymore you would probably crush it with the clamp for the boot.
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post #9 of 27 (permalink) Old 07-21-2011, 08:40 AM
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The only thing you could do is taper bore the outlet to 72-73mm.
I might make that request when I send them mine next week.
I am glad we got that done Art.
Now get the damn thing on the car, and let me know how it is??

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post #10 of 27 (permalink) Old 07-21-2011, 12:16 PM Thread Starter
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You won't get 72-73 taper on the inlet, its to thin
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post #11 of 27 (permalink) Old 07-21-2011, 12:52 PM
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They made a new plate for me, they had to cause you pay in advance. I had two throttle bodies when I sent mine. I compared the one they did with my spare, and it didn't look like they did much. I must admit I don't have calibrated and certified eyesite capable of 'seeing' a 1mm difference in bore radius though

It just seemed like they didn't "max" bore it. I think they played it a little on the safe side
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post #12 of 27 (permalink) Old 07-21-2011, 12:52 PM
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Quote:
Originally Posted by inthetundra View Post
You won't get 72-73 taper on the inlet, its to thin
Not on the inlet...the outlet.



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post #13 of 27 (permalink) Old 07-21-2011, 02:44 PM
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Quote:
Originally Posted by shadowvox6 View Post
Not on the inlet...the outlet.
I am confused. I know that you must know that the smallest diameter in the throttlebody will dictate the max flow possible. So larger outlet vs inlet doesn't do any good. The inlet side is the restriction.
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post #14 of 27 (permalink) Old 07-21-2011, 08:32 PM
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Quote:
Originally Posted by sc.intrepid View Post
I am confused. I know that you must know that the smallest diameter in the throttlebody will dictate the max flow possible. So larger outlet vs inlet doesn't do any good. The inlet side is the restriction.
There is a taper from the factory on our TB's. There is a reason for it.



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post #15 of 27 (permalink) Old 07-21-2011, 08:59 PM
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A taper in the outlet of the throttle body would increase the velocity of the air flow flowing into the low pressure area behind the throttle body

EDIT: Realized after Tom was talking about making it larger rather than smaller, so the above principle wouldn't apply

Last edited by tintin555; 07-21-2011 at 10:13 PM.
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