case/packer/cylinder porting:
inlet web slighty flowed (not too much to keep a fine balancing without remove too much matter the other side) and advanced (7° more)
O-tuning Olivier's px200
- sean brady scooters
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I like the way that you hook under the closing edge of the crank like i often do also ,it can only help cant it by maintaing intake velocity right up to the last moment and also scoop it in
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- fastfrog
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standard carbide cutters, no stone.wack 63 wrote:What tools are you using to port the cylinder?
I hooked the inlet back wall too: Hope you can spot it:sean brady scooters wrote:I like the way that you hook under the closing edge of the crank like i often do also ,it can only help cant it by maintaing intake velocity right up to the last moment and also scoop it in
Size matters!
- fastfrog
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crank bitza home.
half motovespa (right "motovespa" web) and italian inlet web. The former one has an insane inlet timing with more than 75° ATDC. Unrideable on open streets...So I swaped the left web for a more common 110/55° and worked it to get 124/55°
exhaust wider (+1mm each side) and higher( 1,3mm)
before:
during:
squish checked 2,38mm!!
half motovespa (right "motovespa" web) and italian inlet web. The former one has an insane inlet timing with more than 75° ATDC. Unrideable on open streets...So I swaped the left web for a more common 110/55° and worked it to get 124/55°
exhaust wider (+1mm each side) and higher( 1,3mm)
before:
during:
squish checked 2,38mm!!
Size matters!
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looking good fastfrog, it's going to fly
The exhaust port could still do with another 30 minutes work though. The sides of the port should be more parallel yours enter the bore like a trumpet. If you want to keep the oval top then its your choice!
The exhaust port could still do with another 30 minutes work though. The sides of the port should be more parallel yours enter the bore like a trumpet. If you want to keep the oval top then its your choice!
Vespa est ieiunas, quia semper operaturi