Was ITB size for 2270 motor Now Single plenum 2270 |
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Was ITB size for 2270 motor Now Single plenum 2270 |
cgnj |
Mar 15 2016, 03:41 PM
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#1
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Senior Member Group: Members Posts: 623 Joined: 6-March 03 From: Medford, NJ Member No.: 403 Region Association: None |
I have been running 45 dells on 2270 with 34mm vents. Not sure if it was the cam choice (163/86b0, but it was much easier to drive with than with the 38/39 vents.
I was going to gut my spare dells for this project, but I think they are worth more in the box. So, for street 2270 what size motorcycle from wich bike tb should I be looking at for a first build? Thanks in advance, Carlos |
DBCooper |
Mar 16 2016, 02:13 PM
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#2
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
Well, air can be compressed, so it's temporarily squeezed through the 34mm venturi, but afterwards expands back to 40mm. Means that on either side of that 34mm venturi the air is flowing in a 40mm tube, same size tube as that 40mm throttle body, with the same velocity and volume.
And when that 46mm valve opens it doesn't get totally out of the way leaving an empty 46mm hole, there's still some obstruction there, so a 40mm throttle body can supply what's needed, and at a pretty nice velocity. |
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