Re: Vespa Tuning/Gearing Q's

Jason ( ͡° ͜ʖ ͡°) /
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I'm late to this party but I don't think I saw this mentioned. Do you have pics of your bored out 13mm inlet? I'm betting this is what's holding you back. Boring out the inlet can be done in like a million different ways, and sometimes it's done extremely conservatively. Do you have any photos of it?

Ideally it should look close to the attached image, although this is pretty extreme. After the dremel or drill press, you need to use a round file to really open up the inlet and make the whole intake a round funnel shape. Pic from ciao nl attached. I've seen multiple scenarios where I got an engine that someone said was "bored to 13mm" and the intake patch was literally not tochhed at all. They just drove the drill bit down like 15mm and stopped. This creates a MASSIVE wall for the air and fuel to smash against (eddying) and often makes your engine worse off. You'd be better off not touching it at all. The whole entire thing needs to be opened up on the left and right. This doubles as a way to alter your intake timing pretty significantly as well. After porting my intake the intake duration is 168deg and I'm pretty sure vespas are typically like 150 or so stock? Someone correct me?

Anyways I digress. But yeah if you could provide some more details on how you did the inlet porting that would be helpful. Out of all the modifications you did I think this is the biggest wildcard as to top speed. The additional intake timing from correctly modifying the inlet is huge for high rpm ripping.

20201221_154111.jpg
CaseDrill4.jpg
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Subject Written By Posted
  Vespa Tuning/Gearing Q'sTopic by: Jarod V. Jarod V. 10/18/20 11:22PM
  Re: Vespa Tuning/Gearing Q'sRe: - Joe - - Joe - 10/19/20 08:42AM
  Re: Vespa Tuning/Gearing Q'sRe: Jarod V. Jarod V. 10/19/20 12:01PM
  Re: Vespa Tuning/Gearing Q'sRe: - Joe - - Joe - 10/19/20 12:41PM
  Re: Vespa Tuning/Gearing Q'sRe: pat splat pat splat 10/19/20 01:06PM
  Re: Vespa Tuning/Gearing Q'sRe: Jarod V. Jarod V. 10/19/20 03:51PM
  Re: Vespa Tuning/Gearing Q'sRe: Jarod V. Jarod V. 11/30/20 01:55PM
  Re: Vespa Tuning/Gearing Q'sRe: Jeremy Edwards Jeremy Edwards 11/09/20 05:46PM
  Re: Vespa Tuning/Gearing Q'sRe: pat splat pat splat 11/09/20 05:58PM
  Re: Vespa Tuning/Gearing Q'sRe: EH FCC of the QCB EH FCC of the QCB 11/09/20 08:43PM
  Re: Vespa Tuning/Gearing Q'sRe: Graham Motzing Graham Motzing 11/09/20 08:46PM
  Re: Vespa Tuning/Gearing Q'sRe: Jeremy Edwards Jeremy Edwards 11/10/20 04:12AM
  Re: Vespa Tuning/Gearing Q'sRe: Dirty30 Dillon Dirty30 Dillon 11/10/20 08:31AM
  Re: Vespa Tuning/Gearing Q'sRe: Jarod V. Jarod V. 12/10/20 09:02PM
  Re: Vespa Tuning/Gearing Q'sRe: todd amundson todd amundson 12/10/20 11:35PM
  Re: Vespa Tuning/Gearing Q'sRe: Jarod V. Jarod V. 12/25/20 04:43PM
  Re: Vespa Tuning/Gearing Q'sRe: Declan g Declan g 12/14/20 10:13AM
  Re: Vespa Tuning/Gearing Q'sRe: Jason ( ͡° ͜ʖ ͡°) Jason ( ͡° ͜ʖ ͡°) 12/26/20 02:52PM
  Re: Vespa Tuning/Gearing Q'sRe: Jarod V. Jarod V. 12/29/20 06:16PM
  Re: Vespa Tuning/Gearing Q'sRe: Jarod V. Jarod V. 01/03/21 01:54PM
  Re: Vespa Tuning/Gearing Q'sRe: . Chudas. . Chudas. 01/03/21 02:14PM
  Re: Vespa Tuning/Gearing Q'sRe: - Joe - - Joe - 01/03/21 03:08PM
  Re: Vespa Tuning/Gearing Q'sRe: Matt Grantonic Matt Grantonic 01/06/21 12:26AM

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