175 H Supermono

Show us your projects and restorations
Post Reply
User avatar
P&S
Posts: 84
Joined: 21 Oct 2017 18:18
Location: Rome Italy
Location: Roma

175 H Supermono

Post by P&S »

Looking for for something to improve performances and reduce vibrations on my 125 H, and after some interesting experiences and failures ( You can have a look on this topic about alternative pistons at pages 3 and 4.
https://motomoriniclub.forumcommunity.n ... 4655&st=45 )
I thought :” why not try to develop old Lambertini’s idea”
Lambertini developed for the 250 T a balancing system that used the rear rod of a 500 twin engine linked by a service rod that he called “ batacchio”(door knocker) pivoted to the camshaft.
The device was tested and it reduced dramatically vibrations, but it produced a beat that could not be explained because there was no contact between parts.
The project was later abandoned for other reasons and the 250 T turned out to be probably the worst Lambertini’s engines.
As we know that project came in Ducati’s hands that developed the 600 supermono.
It was impossible for me to start from the camshaft, so fitted the “batacchio” outside the engine, same solution used by Ducati.
In this project I decided to change the virtual angle of the rear cylinder from 72° to 86°
by lengthening the batacchio to the maximum.
My CAD design was CAM machined by Bevotroppo (drinktoomuch). A friend and crazy enthusiast Morini guru.
We presented the engine to Lambertini and he congratulated us,
he also will provide us his specific calculations to determine exact weight of the "batacchio".
His appreciation made us very proud.
Engine runs well, vibration are a lot reduced compared to previous 125 h.
There are stil some problem to solve to find the best tuning.

The "batacchio"
https://vimeo.com/manage/videos/582099534
First road test,
https://vimeo.com/manage/videos/581851720
Attachments
P1030020.JPG
P1030020.JPG (311.3 KiB) Viewed 5289 times
mbmm350s
Posts: 666
Joined: 22 Jun 2018 10:18
Location: Reading UK
Location: Berkshire UK

Re: 175 H Supermono

Post by mbmm350s »

Hello Paolo,

You are very clever to do this engineering and are to be congratulated.
Thank you for sharing.
Mark
User avatar
Daddy Dom
Posts: 512
Joined: 16 Nov 2006 19:48
Location: Auckland, New Zealand

Re: 175 H Supermono

Post by Daddy Dom »

Amazing, congratulations!
So good to have the blessing of the Master.
MRC 3082½
User avatar
P&S
Posts: 84
Joined: 21 Oct 2017 18:18
Location: Rome Italy
Location: Roma

Re: 175 H Supermono

Post by P&S »

Thank you very much for your appreciation. :D

Just found the latest copy of Lambertini's idea:
https://www.motorradonline.de/ratgeber/ ... nzylinder/

However 90 hp from a 600cc mono is remarkable !!
This speaks volumes about the potential of Lambertini's idea
julianharty
Posts: 478
Joined: 15 May 2016 16:34
Location: High Wycombe
Location: High Wycombe Area (Bucks)

Re: 175 H Supermono

Post by julianharty »

I've just discovered this post (owning a 125 T (the last of the 125 H range)) led me to it :)

Incredible work and the rest of Paolo's videos on vimeo are well worth watching.
Post Reply