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Nice work
What stroke do these TCR cylinders usually have? And another question, the cylinder mounting studs, you needed to adjust these or did the TCR cylinder fitted on the studs without adjustments? Like the Simonini cylinder used the same positions for the studs.
Tnx!
This TCR is bore 47,6 stroke 45.
Now word in stroke 46.The studs of simonini crankshaft have 51mm of wheelbase, while the cylinder Minarelli have 50mm of wheelbase.
I have enlarged the hole on the cylinder from 7mm to 8mm.Than you’ve made a very good choise with the TCR cylinder. A few adjustments but it all fits pretty well when I look at this.
Have you thought about mounting an HPI? But when I think about it, the transmission is more important…
I’m waiting for the test results 😀
What’s HPI??
Horse Power Ignition. It’s a brand that makes internal rotary ignitions, so a HPI is an other word for a internal rotary ignition. But I think it’s easier to say HPI rather then internal rotary ignition 😛
No no, the internal rotary is too too light!! No good for our engine…
Then the Simonini is very good and Elven make the modify to put variable the ignition…Too light ?
Once i drove without a flywheel and only a battery powered ignition, this was amazin with a good variomatic from a standing start.
My citta with an original tuned cilinder started to wheely, it has never done that with a flywheel. The only downside was the lack of aiflow for cooling the engine and ofcourse the batery witch was dead only after 20minutes of driving :p
A low rotating mass is only helpfull in the periode that the engine is building up revs, so in my case the lack of flywheel was only noticable in the periode that the centrifugal cluch was engaging;)
AW50-4t | 13.13 | Gianelli Citypower | 3.2Nm@6000rpm | 3.0pk@6700rpm
Home made engine dynoArvidW :
Too light ?Once i drove without a flywheel and only a battery powered ignition, this was amazin with a good variomatic from a standing start.
My citta with an original tuned cilinder started to wheely, it has never done that with a flywheel. The only downside was the lack of aiflow for cooling the engine and ofcourse the batery witch was dead only after 20minutes of driving :p
A low rotating mass is only helpfull in the periode that the engine is building up revs, so in my case the lack of flywheel was only noticable in the periode that the centrifugal cluch was engaging;)
If you think who the scooter’s cranckshaft is too heavy that the one of moped.
The TCR crankshaft weight 1,5 kg while the Simonini crankshaft weight 980g…on the HPI more people mount weight of clay!! Is on track or drag racing…
An ignition too light have more rpm, but nothing force draft…And I think an internal rotary ignition will increase the top RPM? But, I think your Bravo is made for circuit racing, isn’t it? For this purpose this simonini ignition is good I guess… An internal rotary ignition could be better for drag racing, but I don’t think you made your bravo for this.
But I do think your Bravo could use a bit smaller and lighter front fork. This also will decrease your chance for a whobble effect (witch I think could be quite big now, if you’re driving at high speed).
But whatever 😛 haha this engine and subframe you made are great!
TimoO_ :
And I think an internal rotary ignition will increase the top RPM? But, I think your Bravo is made for circuit racing, isn’t it? For this purpose this simonini ignition is good I guess… An internal rotary ignition could be better for drag racing, but I don’t think you made your bravo for this.But I do think your Bravo could use a bit smaller and lighter front fork. This also will decrease your chance for a whobble effect (witch I think could be quite big now, if you’re driving at high speed).
But whatever 😛 haha this engine and subframe you made are great!
My friend who run for TCR in italian championship drag racing use the weigth of clay on the internal rotary!! TRT use Leonelli ignition because is too heavy that an internal…
The light ignition is good only for cross race.Interresting, almost every dutch sprintscooter uses a internal rotor without any extra weights.
The only way to be realy sure is to calculate the gear ratio including the variomatic, calculating all of the moment of inertia of the crankshaft, piston, variomatic, clutch, wheel and the result of te complete mass of the moped and person.
When you have all these data you can calculate how much the complete crankshaft assembly should weigh in combination with the gear ratio of the scooter when accelerating from a standing start. This is the way how the gear ratio of the first gear of a cars is chosen.
AW50-4t | 13.13 | Gianelli Citypower | 3.2Nm@6000rpm | 3.0pk@6700rpm
Home made engine dynoThe problem with the normal ignition is the amount of RPM’s which it cant make.
On fast scooters people also change their ignition into an rotor one, because of the rpm limit.
I dont know the max RPM of TCR , but i guess it is something like a 2F4R which can handle about 15000 RPM.A normal ignition cant handle so much rpm. But a Hpi / Malossi ignition can handle 20.000 rpm.
Btw 🙂 still nice shit, i bet ivano cant keep up with you hehe
hansieb :
The problem with the normal ignition is the amount of RPM’s which it cant make.On fast scooters people also change their ignition into an rotor one, because of the rpm limit.
I dont know the max RPM of TCR , but i guess it is something like a 2F4R which can handle about 15000 RPM.A normal ignition cant handle so much rpm. But a Hpi / Malossi ignition can handle 20.000 rpm.
Btw 🙂 still nice shit, i bet ivano cant keep up with you hehe
The Simonini ignition originate from an ingniton of a ultralight airplane engine.
I’ve see a Simonini engine up to 14.000rpm with its ingnition…
My Piaggio Vespa (not moped) arrived at 11.200rpm, 28bph with an ignition similat at Simonini one.
Almost all the italian dragscooter have make heavy their ignition…
The faster dutch scooter how much bhp? Time in 0-150 meters? Speed in 0-150meters?http://www.stichtingsbo.nl/downloads/resultaten/sbo_zoetermeer08_kwalificaties.doc
I don’t know what te rules are in Italy, but it could be stricter here.
So the average is something like 6,7 seconds and topspeed 120/130 km/h for the fastest scooters.
time avr. speed topspeed reaction time without reaction
Birger Vanderheyden,,6,340 s | 86,7 km/h | 129,4 km/h |,0,108 s | 6,231 sIn Italy the 80cc no gas 0-150meters in 5,9/5,8
The 80cc with gas 0-150meters in 5.5@165km/h
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