Buly,
I went with a 100mm Holly TB for my 20B.  Its probably too big, but that's better than it being too little.  So far, it seems to be working just fine.

Mark


On 4/29/07, Bulent Aliev <atlasyts@bellsouth.net> wrote: I originally planned and tried TA set up on my Cosmo 13B. Soon after
the first few flights removed the turbo and vent NA. At the time did
not pay much attention on the throttle body size, counting on the
turbo to make up for any losses. Today I measured the inside opening
of the TB and was surprised to find it was only 60mm. This is rather
small. Paul Lamar on his visit also said I should get a bigger one. I
wander what size TB other people are using, or any comments and
suggestions on the matter will be helpful.

Buly





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