fd throttle body on a 20B?

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Old 01-23-03, 11:48 PM
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fd throttle body on a 20B?

I swear I just read someone was doing this due to larger secondaries or something on the fd tb. I can't remeber where or I saw or read it , or even if I did for that matter. Am I high? Just need to have this settled.
thx
Old 01-24-03, 07:00 AM
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Formally 20b 3rd gen

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Your are not mistaken, I am using my 13b TB w/ a 4mm bore
Old 01-24-03, 12:12 PM
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the bolt patterns are the same, the bac passage is slightly different, and needs to be blocked or something.

mike
Old 01-24-03, 09:26 PM
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Is that a 13bt or 13brew tb, and would you two care to elaborate more on the details/differnences.
thx again
Old 01-25-03, 05:31 PM
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I thought the FD TB didn't have the front set of butterfly plates like the FC and cosmo motors?
I just stuck with the 20B TB and did the TB mod to it.
Old 01-28-03, 07:18 PM
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20B one is larger. (slightly)

Looked both just a moment ago to compare.....
Old 01-28-03, 07:41 PM
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20B primary bore is slightly larger, but the primary throttle plate is identical in dimesions as the FD 13B-REW primary throttle plate.

I measured with a caliper myself.



-Ted
Old 01-28-03, 08:28 PM
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So are the secondaries larger also. I would assume so, but I do not have a 13brew tb to compare with.
Old 01-29-03, 07:35 AM
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Yet another bit to add to my list for my conversion.

The list is growning faster than I'm getting parts for it




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