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Engines Plugs Mufflers Fuel > Kasama Header-YS91, 2 thumbs up
 
 
Jason Bell
Elite Veteran
Location: San Diego, Ca

Now that I have had some time to mess with and tune with the Kasama Header for the Hatori SB 19 paired with my YS91 I must say, the thing rocks. The first time I put it on I noticed that the mount was centered on the engine, and the holes looked to be more "smooth" so air could be let out much easier, with little obstruction. Flight tests back to back to back have shown that it definitely has more power than the stock Hatori header. Bolt one on and try it, worth the $50 in my opinion

I let Brandon Updike fly mine with it on and him not knowing it was on and he said it had more power, so I gave him an extra one he had, and he bolted it on his machine and he loved it as well.


Thanks Kasama for a great product!

Team Avant
Team ElyQ
Flight Power USA
Aerospire
Vblades
07-04-2008 02:24 AM
HOMEPAGE  
 
 
mchammer
Veteran
Location: California,USA

where can I get one??

Peace Through Superior Firepower!!!
07-04-2008 07:54 AM
 
 
Nick Jones
Key Veteran
Location: ....

http://grandrc.com/inc/sdetail/136619

http://grandrc.com/inc/sdetail/136618
07-04-2008 08:03 AM
 
 
mchammer
Veteran
Location: California,USA

thanks nick!

Peace Through Superior Firepower!!!
07-04-2008 08:09 AM
 
 
Dood
Elite Veteran
Location: America's Dairyland

How did Hatori get their pipe wrong in the first place?

Isn't the SB-19 a pipe designed for the YS91-sr?
I thought the SB-19 was supposed to OPTIMIZE the SR's performance?

A company such as Hatori, who is in the business of mufflers and pipes... They should KNOW mufflers and pipes! Not to mention consumers pay top dollar for Hatori stuff!

Then this company Kasama steps in. Kasama is best known for the head they created for the Raptor 50!
How does Kasama "fix" what Hatori got wrong?

"El Dooderino" if you're not into the whole brevity thing.
07-04-2008 11:24 AM
HOMEPAGE  
 
 
crazydave
Heliman
Location: Bedford MA USA

I just bought one for my 91ST with a 939. I am no 3d Master, but I did notice a slight increase in power also, enough to suggest it to anyone that has a Hatori 2-piece.

Something tells me the power comes from the port matching that Kasama does(the Hatori header's opening is slightly smaller then the exhaust port whereas the Kasama is a direct match), rather then the smoothing and centering. Nevertheless its it a beautifully machined piece and worth the $50. Very happy with mine.

Dave
07-04-2008 01:24 PM
 
 
Jason Bell
Elite Veteran
Location: San Diego, Ca

Agreed with crazy dave. The exhaust port is matched the same size as the port on the motor and everything seems to have a smooth finish like its been polished. As to how it works so well, don't know bit I've had about 5 people ask me what I did to my heli to make it like that at the field. Try it for yourself.

Team Avant
Team ElyQ
Flight Power USA
Aerospire
Vblades
07-04-2008 02:43 PM
HOMEPAGE  
 
 
mchammer
Veteran
Location: California,USA

I wonder if the stock hatori part was ported(ground witha dremel tool) I bet you would get the same results.I used to do this on some of my older engines but never really did a conclusive before and after test. The key is a matched port and smooth garadual transition to the muffler.(no stepping in the port or header).and if it is just a big hole you will lose power due to velocity loss.

Peace Through Superior Firepower!!!
07-04-2008 10:13 PM
 
 
Futura SE
Veteran
Location: Fayetteville, Arkansas

Couldn't the stock header be modified to allow for the same power as the Kasama???? I mean it could not be that hard could it. It needs to match not be bigger or smaller. Correct???

Norman Ross Jr.
07-05-2008 03:13 AM
 
 
mchammer
Veteran
Location: California,USA

I believe it needs to match the rectangular port opening and be a smooth gradual transition to the round muffler entrance.

Peace Through Superior Firepower!!!
07-05-2008 07:21 AM
 
 
Futura SE
Veteran
Location: Fayetteville, Arkansas

Forgive me guys I am ignorant of port matching. I know what the term is when people speak of it, but what does "gradual transition" mean??? The port should be same size as exhaust port I know, but should the port "flare out slightly larger" as it goes towards the muffler??? I mean the exhaust port on the header shouldn't be straight, but it gets larger as it goes away from the engine???

As it has been said it is shocking that a company like Hatori would not know something like this. They have been making performance exhausts as long as models have been around.

Thanks,

Norman Ross Jr.
07-05-2008 04:24 PM
 
 
mchammer
Veteran
Location: California,USA

Quote 
but should the port "flare out slightly larger" as it goes towards the muffler??? I mean the exhaust port on the header shouldn't be straight, but it gets larger as it goes away from the engine???

that is exactly correct.

any smoothing or radiusing of sharp angles is better than a step in the port flow area.

However, in theory, there is a perfect angle of transition that provides the best velocity versus flow to the muffler.That is the tricky part.the only way to know what works best as possible is to test it on a flowbench. probably gross overkill for r/c modeling. I highly doubt that kasama has flowtested there header. but they no doubt have improved upon a very weak link in the system. clearly they have smoothed and matched the point of transition.thus a gain in net power.

Peace Through Superior Firepower!!!
07-06-2008 12:09 AM
 
 
Divot
Veteran
Location: Mesa, AZ

Quote 
Flight tests back to back to back have shown that it definitely has more power than the stock Hatori header

You are a certainly a better pilot then I am, but I highly doubt this
07-06-2008 02:30 AM
 
 
pwood
Key Veteran
Location: Dubai, UAE

Hi Guys

I tried 'porting' a std header. I did it before running the motor. After the break in period, i was not really happy with the motor. The mid range had a lean pinging, even with the mid range way rich. This rich midrange gave a shake and a poor/sluggish transition.

Here on RR, i read about the muffler being tuned for the std 'un-ported' header. I got a new one.....much better. The mid range pinging was gone and i could lean the mid needle to give better performance.

I beleive that a 'ported' header must give better performance on a tuned muffler, that is why i did mine in the first place.....
I would love to try out the Kasama one. It is more than just ported, it is slightly repossitioned.

Regards
Paul

PS: This was a SB19 on a YS 91 SR and then later on a 937 and a YS 91 ST
07-07-2008 07:21 AM
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

The ST seemed to benefit from a ported hatori header when using the SB-18 but I found the SR lost torque when using a ported header on an SB-19.

Charles

Please stand by for faster service!
07-07-2008 01:19 PM
 
 
helis
Heliman
Location: CO

Lukas Riva was running Kasama header at the 3D Master also. If Kasama header not as good as someone said, I don't think Lukas will use it in the 3D Master and he also won the Master. I will put Kasama header on all my 90 helis.

Thanks,
Ton
07-30-2008 04:19 PM
 
 
Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

I'm sure that Mr. Hatori could tell us more on this subject than we'd ever care to know. I would take no effort at all to machine such a header, yet he didn't. Wonder why? The ENTIRE running profile of the engine has to be considered here. The flowed header may increase top end power, but what happens to midrange torque? How about midrange smoothness? How about transition from WOT to midrange? How about transition from midrange to WOT? What rpm range? At what gear ratio? What about another guy who doesn't fly the same way, style, fuel, or model? Simply bolting on the header and saying it makes more power doesn't fully assess all of these running characterisics. I will wager that that Hatori's production muffler DOES/DID take these variables into consideration.

Ben Minor
07-30-2008 05:37 PM
 
 
mchammer
Veteran
Location: California,USA

Hatori is a quality product no doubt about it. however that doesnt meen that it is a perfect product that cant be improved upon.I can tell you that hatori knew that its header design (prior to the floating four bolt system) was inferior to the current design.thus the new improved model.when the o rings got tired on the old one it would spit the muffler off of the heli like a bad tooth!!!

Peace Through Superior Firepower!!!
07-31-2008 12:07 AM
 
 
Futura SE
Veteran
Location: Fayetteville, Arkansas

I agree with Ben totally. I may be mistaken, but Hatori did not design their header/pipe for pure stick banging 3D and Kasama DID make their header for guys who take off and bang the sticks until they land.

Something to consider.

Norman Ross Jr.
07-31-2008 03:18 AM
 
 
white chocolate
Key Veteran
Location: Baltimore, Md.

Awhile back I believe it was Augusto that tried doing this with a regular header. He did a post about dremeling down the opening and then shaving a slight angle. I dont remember wich way the angle was. Anyways people were doing it and were getting different results. In the end it was said that it was not a good way to go and it would shorten the engine life (for some reason I have no clue). They also said that Hatori had tried this and it was found that the regular header was better. I dont remember the specifics but people stopped doing it.

Team Raptor
Radix
TEAM MAPTERGY...Definitely nuff said.....
07-31-2008 06:49 AM
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Engines Plugs Mufflers Fuel > Kasama Header-YS91, 2 thumbs up
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