Piontek’s vespa si

[piontekTopic starterBerichten: 69]

Thanks to everybody! I really appreciate.
Anyway now the pipe is abit reduced in lenght, cuz was too much.

I have to check if I have the vid of first start.

However……today I was almost going to cry, because of an unexpected accident.:'(
I’ve broke the crankshaft … even though I didn’t run it so hard.:?:boos

On the track I used to run it with the 70 pulley and normally overtaking the 85kmh without any problems.
I still can’t beleve it. I’ve just used this engine 3-4 times on track at maximum revs ,running very smooth.

I’ve already disassembled the engine from the frame and the cnakshaft is broken exactly in the fly wheel fixing hole.
I’ve known that other users on ccc, broke the crank in the same way.

So I suggest to all…..(we have to design an appropriate crank).

:boos:boos

[EdjuhBijdragerBerichten: 6956]

Impressive piece of work! A real SI racer.

[piontekTopic starterBerichten: 69]

@Edjuh
thank you a lot;)
Unfortunately this piece of work , had a short but intensive life:D

[RickieboyDonateurBerichten: 312]

you have also i nice project

[JavadDonateurBerichten: 1808]

Very cool SI Piontek, the paint is very nice and smooth and I like the exhaust as well.
It’s good that you made it a little shorter, it should look very cool now.

Too bad you broke your crank though, it isn’t nice to take an engine running that smooth apart again.
I wish you good luck with that.

<3 Thunderstone
Check mijn perso!

[SebastardBijdragerBerichten: 235]

Why did you fix the carter with epoxywhen you have a TIG welding instalation to weld it with?

nice bike tough!

[piontekTopic starterBerichten: 69]

thank you javad, nice to hear from you again.

To sebastard beacause the tig welding is the best choice but at the same time you transmitt a lot of heat through the carter.
This causes distortions on the surfaces of the carters.
To avoid any of these problems I just made a little weld, also beacause the wall where I did the weld was very thin, so it’s easy to make a hole through it.
Than I decide to put some epoxy , just to help the weld and fill the empty points.

[SebastardBijdragerBerichten: 235]

oke,logical awnser!

(i’ve worked for 7years as a TIG welder,allu&inox)

keep up the good work!

[piontekTopic starterBerichten: 69]

here the crap crankshaft.

[piontekTopic starterBerichten: 69]

[MartinoModeratorBerichten: 7384]

Looks like crap indeed, our own simo racer Sil did had sort of the same crack in the crank. I thought that Simonini did some sort of refund on this. But since his perso takes over more then 50 pages it is hard to find the correct story on this.
http://vespa-ciao.nl/forums.php?m=posts&q=3133&d=0

The photo’s looks certainly not amusing. Hopefully this wouldn’t let you down of future progress. A few rounds on a circuit is way to little to enjoy this Si.

Edit: her it is. http://vespa-ciao.nl/forums.php?m=posts&q=3133&d=2250

Link naar Mijn collectie / Projecten.

[piontekTopic starterBerichten: 69]

hi guys!

Here some news.
I’ve started a new project, much more cheaper than the previous one.

The setup is this:
41mm DR
original carters
original crank shaft
1212 carb opened up till to 13mm or something more.
giannelli mega or leovince exhaust
Variomatic transmission made of polini utah and original clutch.
electronic ignition with lightened flywheel.

here a photo of the frame that I started to shape yesterday.

[piontekTopic starterBerichten: 69]

later I’ll post a picture of the cleaned frame.

[piontekTopic starterBerichten: 69]

here the unfinished frame.

and my new flywheel lightened up to 1.1 kgs 😀

[EdjuhBijdragerBerichten: 6956]

Thats a nice emmentaler flywheel my man!

[Gebruiker]

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