Cylinder Porting | Vespa PX Engine TUNING 🛵🔧 | Part 7 {English}

In today's episode André is going to show you the heart of tuning an engine and will change the timing of the cylinder and modify the exhaust port. He will show you how he approaches the matter and what you need to keep in mind.
The multi-cylinder two-stroke engine simulator: vannik.co.za/EngMod2T.htm
Some exhaust stubs from our SIP shop that you could use for tuning: sip.shop/exhaust-stubs-list
You can also check out these books from our shop that we recommend for tuning your vespa: sip.shop/books-for-tuning-list
Here are some other books that are also worth reading:
► Blair, Gordon P.: Design and Simulation of Two-Stroke Engines (Premiere Series Books) | ISBN: 9781560916857
► A. Bell; Two stroke performance Tuning; Haynes Publishing; ISBN-10: 1859606199 | 2. Edition (28. November 1999), ; ISBN-13: 978-1859606193
Chapters:
0:00 Intro
0:25 Degree to time translation
1:40 Blow down period
2:48 Timing estimation
3:42 Transfer port adjustment
5:27 Squish gap
6:33 Ex port opening date
7:14 Ex port width
8:20 SIP Performance tuning flange (15045210) sip.shop/exhaust-manifold-stu...
10:20 Shaping the ex port duct
14:12 Outro
14:32 End
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[@johnbravo7542]

Wow! I have never heard someone explain it like this,so easy to understand.

[@cagatayguven7025]

top class tutorial 👍

[@pauldeacy9989]

Brilliant vid! Thank you for taking the time

[@alessdiazlopez54]

Really really appreciate this job and explanations, congrats, amazing

[@alamnaful]

Thanks for share this knowledge ❤

[@jamesmason7124]

Thank you for doing this in English, anyway you can do some videos on the Piaggio moped motors, I want to build a high torque low rpm 65 to 75cc motor using Polini parts and a Polini Bravo type head. Thank you

[@cecilyates3536]

Thankyou, was very interesting and informative, cec from UK

[@johnforrester2106]

Yes, first class!!

[@vasilispapadellis8022]

is this type of porting is applicable to a vespino 90s

[@hm-rk4lg]

bitte auf den dyno mit dem zylinder. eine eingangsmessung wäre noch ideal gewesen

[@mohdsaifulmohdsaid852]

any 70hp scooter engine for sale?

[@ajiagni139]

Amazing.. you very handsome..

[@captainhook185]

Kommt dat noch in deutsch

[@antoniomarto8742]

Hi,
6% of 1/100 is indeed 6u secs but it is not 6/1000=0.006 sec.
Instead 6u sec = 6/10000 sec= 0.6m sec = 0.0006 sec
u sec - microseconds
m - miliseconds

[@robertthomas1717]

Thanks for sharing your knowledge