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Post by tsimi on Feb 24, 2016 9:56:09 GMT -5
These are comparison images of the 5BM engine stock reed block, the after market KN企画 (KN Kikaku) big reed block and the Chameleon factory big reed block. I have posted images of them inside my Jog-Mania thread but I thought it deserves a thread of its own since it is hard to find within 30+ pages. I also measured them and here are the results. Stock Reed BlockReeds: Stainless ( ? ) / Thickness 0.22mm Intake hole size: 38.10mm x 29.26mm Height: 41.55mm Outer Width: lower area near gasket 43.81mm | upper area near tip 42.20mm Stuffer hole size: 23.40mm KN企画 & Chameleon Factory Big Reed BlockReeds: Glass Fiber / Thickness 0.45mm Intake hole size: 39.10mm x 30.20mm Height: 43.42mm Outer Width: lower area near gasket 46.87mm | upper area near tip 45.23mm Both Big Reed Blocks have the exact same dimensions. Only the reeds, the plates that stop the reeds and the gaskets look different other then that they are the same. Even the reed thickness is same.        Top gasket comparison. Left KN企画, right Chameleon Factory Chameleon Factory Top Gasket on Intake. |
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Post by tsimi on Feb 26, 2016 1:28:15 GMT -5
Got another Big Reed Block today. I couldn't pass the chance and went for it.  It is in brand new condition and the 2nd only after market reed block for a 5BM engine. I will take new pictures with all 3 reed blocks to compare and also measure them again and update the first post later today. Brand/Maker is Cameleon Factory and new price for it is somewhere around $70-80, I got it for $35! which is why I couldn't pass up such a chance. It comes also with glass fiber reeds, thickness unknown yet, but the glass fiber reeds are split into 2x2. The one from KN has just 2 large glass fiber reeds, one on each side. More easy to understand once I took the pictures. Now I got both Big Reed Blocks that are out there for a 5BM engine and I probably will install the new one to compare. Anyways stay tuned for more new info and pics. |
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Post by tsimi on Feb 26, 2016 7:58:43 GMT -5
Thread has been  . See first post. Thx. |
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Post by sublunacy on Feb 26, 2016 10:48:10 GMT -5
stainless steel last pretty long. fiberglass last a few weeks. carbon fiber is somewhere in between. it really depends on the design and quality of the carbon.
---------- on my piaggio.-------------
i have a midrace enginge so i like simple two petal carbon reed blocks. my engine gargles till about where the pipe hits. perfect!
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two petals for hp. four-eight petals for torque.
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Post by Lucass2T on Feb 26, 2016 16:35:19 GMT -5
Awesome review Tsimi!
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Post by tsimi on Feb 26, 2016 18:50:32 GMT -5
two petals for hp. four-eight petals for torque. is that a fact or your own experience? I tried to look for useful info regarding the amount of petals on a reed block but can't find anything. |
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Post by sublunacy on Feb 26, 2016 19:02:29 GMT -5
yes. but the the reed petal thickness and length is what tunes the frequency/ max rpm.
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Post by 190mech on Feb 26, 2016 20:50:54 GMT -5
The latest road race reed setup is a carbon main reed with a fiberglass sawtooth short reed to back it up,here is a pic I grabbed from KiwiBiker;  I'll see if I can dig up some more specific info on this mod.. |
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Post by sublunacy on Feb 26, 2016 21:14:04 GMT -5
like i said reed petal thickness and length tunes the rpms. i could show you pictures but they are only pictures....... like everything the answer is not as important as how you got there.
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Post by Lucass2T on Feb 27, 2016 12:33:24 GMT -5
like i said reed petal thickness and length tunes the rpms. i could show you pictures but they are only pictures....... like everything the answer is not as important as how you got there. Do you know something about diagonally woven carbonfiber petals? How do they behave different from horizontally/vertically woven petals? There should be difference but i haven't really gotten any info about em yet. 190mechIn what kinda engine are those petals used? 125cc GP racers? |
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Post by sublunacy on Feb 27, 2016 17:39:52 GMT -5
sorry never heard of diagonal weave before. i have messed around with the online calculators alot. check it out if you have any questions holler at me.
basicaly torque reeds have a great inneficiency at high rpm because they dont close well enough. the torque might be bigger but they dont perform any higher hp. this is the example of inefficiency if that makes sense.
i prefer my ineficiency to be much lower rpms. my spelling is probly not good today. im massivly sick.
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Post by 190mech on Feb 27, 2016 17:39:56 GMT -5
Lucass,That pic is a NSR250 V twin,I think the saw tooth setup was dreamed up by Wobbly(Wayne Wright of NZ)a renowned tuner for the Kart racing world and his posts on KiwiBiker lead others to use it on their road racing motorcycles.I can dig up the rest of the way it is constructed if y'all like..  |
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Post by tsimi on Feb 27, 2016 19:09:57 GMT -5
In PIGs thread I asked about the reed block spacer and the guys helped me understand. So I went to check how much clearance I would need to get the port free. With both reed blocks, stock and after market, it would take a 7mm spacer.   |
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Post by 190mech on Feb 28, 2016 6:48:27 GMT -5
The boost port isnt the most critical port,but I'd do my best to get the reed out of its way...
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Post by Lucass2T on Feb 28, 2016 7:28:31 GMT -5
I would focus on flow and use common sense to determine where you can improve flow. Primary compression is also an important factor when doing the spacer. But i wouldn't bother since thats beyond what you can measure and/or feel when makinh changes to that.
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. See first post. Thx.
