sven2242 Posted January 3 Share Posted January 3 Buongiono, Consiglio marmitta per Vespa Primavera 1975 (cassetino grande) motore : -Malossi 132 MHR aluminio squish 1mm -lamellare MRT al cilindro 28PHBH -27/69 BFA/FRT -cluster 18-21 -accension Polini 1.2kgrs -albero Tameni Attualmente Dexter Classic Box 32mm = 😕 = troppo rumore / performance = 😕 = media No troppo visibile ( Polizia....) Nueva Polini original Banana (version Racing) ? é meglio que Dexter Classic Box 32 ? possible ? VMC Siluro Touring (modification possible=cassetino grande = tampone ammortizzatore posteriore PX ???🧐) Help !!! Grazie Quote Link to comment Share on other sites More sharing options...
McKenzie Posted January 3 Share Posted January 3 La Polini non è male, ma su cassetto grande forse non sta. VMC meglio la sport, anche qui non saprei se basta alzare dietro e di conseguenza anche arretratore sul supporto superiore. Quote Link to comment Share on other sites More sharing options...
sven2242 Posted January 3 Author Share Posted January 3 2 hours ago, McKenzie said: La Polini non è male, ma su cassetto grande forse non sta. VMC meglio la sport, anche qui non saprei se basta alzare dietro e di conseguenza anche arretratore sul supporto superiore. McKenzie, so happy to see you here, you help me so much with my electrique problems when i put my ignition Polini on my impiato Primavera. All the electric is OK 👍 Have a happy new year ! 🎄 I'm wondering : Someone from Dexter tell me to buy the "classicbox on 32mm" for my Malossi 132 that is on 28mm. Maybe my problem will come from the exhaust size ? no ? 1 Quote Link to comment Share on other sites More sharing options...
enrico83 Posted January 3 Share Posted January 3 Capio tutto😃 1 Quote Link to comment Share on other sites More sharing options...
solovalvola Posted January 3 Share Posted January 3 2 ore fa, sven2242 ha scritto: McKenzie, so happy to see you here, you help me so much with my electrique problems when i put my ignition Polini on my impiato Primavera. All the electric is OK 👍 Have a happy new year ! 🎄 I'm wondering : Someone from Dexter tell me to buy the "classicbox on 32mm" for my Malossi 132 that is on 28mm. Maybe my problem will come from the exhaust size ? no ? The setup of your engine needs a "proper" exhaust...a classic box, even if with a large initial diameter, kills all the best that the engine could deliver, meaning the mid and high revs. At least you need a vmc sport (if it fits) or the Polini Original you posted. Other option is to re-think the entire engine and build something that can perform with more descrete exhausts .. Ciao 1 Quote Link to comment Share on other sites More sharing options...
sven2242 Posted January 3 Author Share Posted January 3 44 minutes ago, solovalvola said: The setup of your engine needs a "proper" exhaust...a classic box, even if with a large initial diameter, kills all the best that the engine could deliver, meaning the mid and high revs. At least you need a vmc sport (if it fits) or the Polini Original you posted. Other option is to re-think the entire engine and build something that can perform with more descrete exhausts .. Ciao Between the VMC Sport or the Polini which one could be more easy to adapt or modify ? i’m sure it’s possible to « twist » a little the exhaust down, and modify the fixations or made them by myself. a Polini original Racing be more powerfull than the Dexter ClassicBox ? Quote Link to comment Share on other sites More sharing options...
Lonza92 Posted January 3 Share Posted January 3 Hi guy! Where are you from? Sorry for my English 😅 I don't know your exhaust but i see on Dexter stand on a exhibition.. So on my 132 malossi ( cast iron not mhr) i used a giannelli endurance with 32mm collector and the exhaust port was 28mm.. On my engine not work very well and when i plug a 28mm collector the engine work much better.. I think the same idea of @solovalvolafor rebuild an engine for use a discrete exhaust.. On the forum can found engine with 130dr on 53 stroke, long ratio and original exhaust with good speed and torque! Quote Link to comment Share on other sites More sharing options...
sven2242 Posted January 3 Author Share Posted January 3 On the instructions of the Polini, they say only if the lenth of the rear shock is more than 300mm 🧐 Quote Link to comment Share on other sites More sharing options...
sven2242 Posted January 3 Author Share Posted January 3 7 minutes ago, Lonza92 said: Hi guy! Where are you from? Sorry for my English 😅 I don't know your exhaust but i see on Dexter stand on a exhibition.. So on my 132 malossi ( cast iron not mhr) i used a giannelli endurance with 32mm collector and the exhaust port was 28mm.. On my engine not work very well and when i plug a 28mm collector the engine work much better.. I think the same idea of @solovalvolafor rebuild an engine for use a discrete exhaust.. On the forum can found engine with 130dr on 53 stroke, long ratio and original exhaust with good speed and torque! France 🇫🇷 ! 8 Quote Link to comment Share on other sites More sharing options...
Lonza92 Posted January 3 Share Posted January 3 In theory you don't have any problems with this exhaust.. The Racing version is more powerful than the normal, almost the vmc siluro.. i read on a Deutsch forum if the vmc siluro on the old 125 primavera fit but the rear shock need a little spacer for extend it and fold a piece of metal of the "cassettino".. I hope polini exhaust is the better solution for preserved the frame of your vespa 😉 2 Quote Link to comment Share on other sites More sharing options...
solovalvola Posted January 4 Share Posted January 4 11 ore fa, sven2242 ha scritto: On the instructions of the Polini, they say only if the lenth of the rear shock is more than 300mm 🧐 From my understanding, you just need to change the spacer that fixes the exhaust at the bottom of the cranckcase relative to the shock used. In the picture seems to fit also on frames with "cassettino", but if necessary, modifications are not so difficult. Though, must be properly done by cutting and re-welding and not by bending. Ciauz 1 Quote Link to comment Share on other sites More sharing options...
sven2242 Posted January 4 Author Share Posted January 4 I have the SIP Evo carter. the fixing are different my model is like the « PK » do i need to order the Polini exhaust for the PK or for the Primavera ? if the « body » of the exhaust is the same, and the only différence on the package are the fixations= it’s OK but i don’t know if the shape of the body of the Polini from PK to Primavera are the same or not…. Quote Link to comment Share on other sites More sharing options...
solovalvola Posted January 4 Share Posted January 4 5 minuti fa, sven2242 ha scritto: I have the SIP Evo carter. the fixing are different my model is like the « PK » do i need to order the Polini exhaust for the PK or for the Primavera ? if the « body » of the exhaust is the same, and the only différence on the package are the fixations= it’s OK but i don’t know if the shape of the body of the Polini from PK to Primavera are the same or not…. Pk I guess...the holes for the mounting are in slightly different positions in the 2 cranckases. The body of the exhaust does not change much. Ciauz 2 Quote Link to comment Share on other sites More sharing options...
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