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Hi all,
I am new here, come from Sweden and I will modify a Super Bravo to be a good accelerator, I don´t care much for top speed.Can you please advice me on how to open the inlet port inside the crank case to allow more fuel to get in there?
I am aware of that too much opening will spoil it so I better ask before I ruin it.I would like to see some pictures and mesaures over how much it can be opened here.
Thanx in advance
! Joor !this is what you’ll have to do, althou the how to is made for an dr evo 43mm cilinder.
Great guides, both of them!!!
I´m glad the winter is ahead of me, I will make this in my own time.
In fact, I do have an Dr Evo 43 mm cylinder so I find this very useful.
A question about the modified crankshaft:
I might buy a TopRacing crankshaft to put in my engine.
Will the opening timings on that crank be like the modified stock crankshaft above?dont do it you wil get something like this
De budget beun tjoener: geen geld is te duur of het werkt nog niet
Link naar Mijn collectie / Projecten.The TopRacing Crankshaft will brake in no time. A real waste of money.
It’s best you modify an original piaggio crankshaft, these last forever.43mm cilinder = 4.3×((0.25×π)×4.3^(2)) = 62,45ccritze :
dont do it you wil get something like this
Shit!!!
I´m convinced to leave that alone…By the way, how does the Ciao engine respond to a lighter flywheel?
My plan is to build a light machine for dragracing over a 75 meter race track.
The setup this far is a Dr Evo 43 mm cylinder, a Polini Top One exhaust, a Malossi variator.
The carb will be a 17 mm Bing, just for the easy finetuning and I plan to use E85 for fuel.
My plan is also to remove the lightcoil from the engine and also mill off the cooling fins on the flywheel.
As I only will race for a short distance I don´t think it will overheat without the cooling fins.
The E85 will combust at a lower temperature but I´m a bit concerned to find a good oil to mix in the E85.So some questions:
How will the engine respond to a lighter flywheel?Is the flywheel from a CDI engine equal to a pointer flywheel?
Have you ridden on E85? What oil do you recommend to mix?
Anything else I need to consider?
– Lighter flywheel; is quicker pickup of the engine and little bit faster acceleration.
– Electronic flywheel(+1kg) is much heavier then that of an pointer flywheel(somewhere between 700 and 1000 grams)
– No experiences with this kind of fuel.
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Martino :
– Lighter flywheel; is quicker pickup of the engine and little bit faster acceleration.– Electronic flywheel(+1kg) is much heavier then that of an pointer flywheel(somewhere between 700 and 1000 grams)
– No experiences with this kind of fuel.
– Maybe this topic will interest you? Unfortunately all in dutch but this could be a perfect idea for you drag races.
Thanks for reply, too bad my knowledge in dutch is a bit too low for tht link.
How is the ignition point determined on a CDI flywheel?
Is it possible to use a pointer flywheel on a CDI engine, will it fit and work?it is deremined with the pick up, but there is not much you can alter, i think that the timing is not so bad.
E85 fuel has a low octane count, witch not improves the performanse of youre engine, try racing fuel instead
like octane 100+17mm carb is not going to fit a normal block, it only fits a speed engine, reedvalve, of evo engine.
flywheel can be lightend but removing the fins is causing a very hot cilinder witch doesn`t improve performanseunless you make it h20 cooled like this:
De budget beun tjoener: geen geld is te duur of het werkt nog niet
Link naar Mijn collectie / Projecten.ritze :
dont do it you wil get something like this
Does anyone know of the quality of Pinasco crankshafts?
Are they as fragile as the Top Racings shown in the picture?the pinasco`s are much better in durability so breaking wil not be an issue 😀
De budget beun tjoener: geen geld is te duur of het werkt nog niet
Link naar Mijn collectie / Projecten.ritze :
the pinasco`s are much better in durability so breaking wil not be an issue 😀OK, great to hear.
I will take advantage of the drilled tap and also use the full round crank to fill the crankcase.Thanks for your feedback.
E85 has a Octanevalue of 104 RON while “normal” fuel has 98 octane so yes , it should higher the performance of your engine
// Sebbe @ MNF
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