MOPED ARMY

where does the stator go?!

2 carbs?

internal ignition?

Where did you find this photo? Is it real?

This would be sick.

I found it snooping around ventilxp and there isn't any more info on it than that. It looks real as far as I can tell. Dont' know anything else about it but I knew everyone was talking about doing this a while back and here it is already done.

so the carb spins :S that can't be safe with those bigger ones. or do they put another plate on top that doesn't spin. i am so confused.

ok so the inside one spines i get it now.

50cc can blast. not everything needs a kit.

Disk valve bikes have the highest power potential. The intake has no restriction. Much the same as piston port motors, except disk valves have non-symetric intake timing. That, is the key.

While reed valves provide more torque everywhere else. And combined with a powervalve you can get wild amounts of torque everywehre.

That said, the RG500, and virtually every GP500 bike all had disk valves. :-) There's good reason for that.

My TC90 has disk valve induction.

I wonder if that carb will fit my pugeuot?

they look about as stupid as a derbi too

can someone please school me as to why a rotary valve engine would also be reed valve? isn't the rotary valve already accomplishing the purpose of reeds but more effectivly? reeds just seem like a restriction to me, but i'm sure i'm missing something.

firstly jona said "vespino engines used rotary valve with reeds and were faster then derbi variants " so there is your "also" :)

and secondly ratory valve intake timing isn't fixed, it varies with engine rpm which is what makes it better then reeds. that's the facts.

but if someone knows why an engine would be both rotary and reed please let me know.

disks don't change shape obvioulsy, but they do rotate with the crank yes. check your facts? also rotary is better then reeds in almost all if not all aspects

I do know the facts.

At "A" rpm, yes, disk valve bikes are better. I think I said that ;-)

Over any kind of a range of rpms, reed valves are vastly superior.

Are you aware that there were dirtbikes with disk valves before reed valves came about? Did you know that every single manufacturer abandoned both piston port and disk valve induction once reeds hit the market? Do you know why they did this?

Did you know that Yamaha went with reed valves instead of disk valves on the RD500 because the reed valves provided torque at anything other than peak rpm?

You're going to make me dig up the specific numbers aren't you? IIRC at low rpm, intake timing as short as 110degrees is proper. At high rpms, as much as 200 degrees of intake timing can be proper.

Though given the tone of this conversation, I will go ahead and dig up the exact numbers sometime tomorrow.

i'm gonna throw this out there but i'd bet that most or all reed setups on a moped will out perform any DIY rotary setups on mopeds due to the sheer fact that the reeds are so forgiving and the rotory is gonna need to be designed very accurately to provide better power.

the av10 motor with rotory might be slightly better on the top end but i wouldn't spend my time and $$$ building a rotory valve ped.

have u guys seen the rotory valve puch mod?? i can't find the pick but its pretty neat looking.

Yes, but Graham Bell said later that reeds where slowly matching rotary valves performance......