Modern Vespa : Difference between ports and displacement

Difference between ports and displacement

OP splash_wave UTC details Hooked 1968 Sprint 150 Joined: UTC Posts: 246 Location: Vancouver, BC
OP splash_wave Hooked 1968 Sprint 150 Joined: UTC Posts: 246 Location: Vancouver, BC	UTC quote Would one rather have a Malossi T5 172cc with the 5 ports, or a Malossi 210 with a 3 port engine case? Question dives into ports vs displacement. Powerband with either setups?

SubEtherBASS UTC details Ossessionato 1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others Joined: UTC Posts: 4944 Location: Australa, Mate
SubEtherBASS Ossessionato 1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others Joined: UTC Posts: 4944 Location: Australa, Mate	UTC quote I worked out... 150 = REVS 200 = TORQUE. Revs is far more fun, unless you are heavy or live at the top of a big hill. Positive

orwell84

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Location: northern New York

orwell84

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Joined: UTC
Posts: 3739
Location: northern New York

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It depends. Ports, timings and displacement are parts of the equation. Gearing is also important.

My stock 200 with the 23/65 primary does higher speeds and stays cool. It feels heavy and cruisey. Shifting is really easy and forgiving.

My VMC 187 with 22/68 primary has a totally different feel. It's quicker and more responsive. Shifting requires more attention to keep the revs in the right place when downshifting. In some ways it's more fun to ride.

SubEtherBASS

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1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others

Joined: UTC
Posts: 4944
Location: Australa, Mate

SubEtherBASS

Ossessionato

1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others

Joined: UTC
Posts: 4944
Location: Australa, Mate

UTC quote

orwell84 wrote:

It depends. Ports, timings and displacement are parts of the equation. Gearing is also important.

Torque:
My stock 200 with the 23/65 primary does higher speeds and stays cool. It feels heavy and cruisey. Shifting is really easy and forgiving.

Revs:
My VMC 187 with 22/68 primary has a totally different feel. It's quicker and more responsive. Shifting requires more attention to keep the revs in the right place when downshifting. In some ways it's more fun to ride.

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