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Post by tsimi on Sept 14, 2016 7:39:14 GMT -5
I was wondering what exactly the difference is between all those reed thickness is. I was looking at Malossi and Polini Carbon Fiber Sheets and you can select 0.25, 0.30, 0.35, 0.40 and 0.45mm I think I read somewhere that more thick means more bottom punch more thin more top end? Is that correct? I currently use 0.45mm glass fiber reeds and was thinking about replacing them for carbon reeds maybe something around 0.30mm?
I think another factor is the carbon fiber position? 45 or 90 degree is that correct? If yes when do you use what?
Very few info out there. I remember we talked about this once but never found clear facts.
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Post by spaz12 on Sept 14, 2016 12:55:36 GMT -5
Me:
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Post by Lucass2T on Sept 18, 2016 15:37:33 GMT -5
There's a whole lotta theory behind this. But in general thin reed petals open early/quickly/easily but at higher rpm they tend to start floating and don't close off the crankcase anymore.
Thick petals require more energy to open but close better at high rpm.
Another thing is carbonfiber weave pattern. Theres vertical/horizontal weave and diagonal weave. I asked a very knowledgable and well respected 2t scooterengine builder this question. His answer was very clear, it's a subject of true trail and error. According to him it's impossible to determine on forehand or give estimates about the type of weave your engine needs.
This guy has a real short temper and I can also imagine him giving this answer to not to have to explain the workings of cf reads.
Myself i don't care too much about what kinda reed petals I should use. I have malossi 0.25mm's and I don't notice any real obvious downsides or bottlenecks or whatever. In my opinion it's such a farfetched part of engine tuning there are a lot of other things you should focus on.
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Post by 190mech on Sept 18, 2016 16:16:56 GMT -5
Here is some info from "wobbly" over at KiwiBiker; Use the softest carbons you can. Make a " rev plate " from the old reed 0.5mm material ie a strip say 6mm wide, this sits on top of the carbon under the screws. Then take the original thin fibre reeds, cut them to 1/2 length then cut them to make 3 pointed hats,these are backups that sit on top of the 0.5mm spacer. Next take the old radius plate and cut it to 1/3 its original length,this sits on top of the backups with the screws going thru all 4 elements. Best reed setup known to man.. Here is a drawing another member made to show the above details; All can be found here; www.kiwibiker.co.nz/forums/showthread.php/86554-ESE-s-works-engine-tuner/page827www.kiwibiker.co.nz/forums/showthread.php/86554-ESE-s-works-engine-tuner/page828Hope this adds to the confusion and madness of a tuned 2 stroke!!
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werewolf197443
Scoot Member
plus need help identifying my zuma engine. the case is stamped AF129E-407347
Posts: 27
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Post by werewolf197443 on Oct 3, 2020 8:02:15 GMT -5
What happened to the drawing?
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Post by aeroxbud on Oct 3, 2020 8:42:03 GMT -5
What happened to the drawing? I'm guessing photobucket happened. It used to be the largest free photo hosting site in the world. They decided to go over to charging for hosting pictures. But not a little. About $200 a year! As a result millions of threads on the internet, suddenly found they had no pictures. Making them worthless.
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Post by 190mech on Oct 3, 2020 18:03:13 GMT -5
The second link for KiwiBiker gives the drawing in my post..Will post it again if needed...
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