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HomeAircraftHelicopterHelicopter Main Discussion › Header: Kasama or Stock Hatori?
04-23-2009 05:32 PM  9 years agoPost 1
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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After rebuilding the YS91 SR engine, I have it back in my Trex 700N (with the stupidly expensive flanged washers that were $1.00 each!) and I am ready to add the header and Hatori pipe.

Should I go with my Kasama header or with my stock Hatori header???

Decisions decisions!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-23-2009 05:41 PM  9 years agoPost 2
REGULATER

rrApprentice

Bakersfeild, CA

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Hey Rock , Go Kasama header all the way you will notice the diffrence

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04-23-2009 05:45 PM  9 years agoPost 3
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Are you going to be at the bakersfield fun fly on May 9th?????

Look me up!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-23-2009 05:51 PM  9 years agoPost 4
BJames111

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San Diego, California

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FWIW, I have not tried the Kasama header. I will say this though, if you know two stroke engines, you will realize that a muffler does NOT make power. It only MOVES the power band up or down throughout the RPM range.

Hatori has been making mufflers and pipes for a LONG time now. It seems to reason to me, if there was a significant power increase by slightly changing the header that Hatori would have done it. The Kasama header may move the height of the powerband to a different place, but nothing is free in the world of two stroke engine tuning. You WILL lose power somewhere if you GAIN power elsewhere.

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04-23-2009 05:56 PM  9 years agoPost 5
Dood

rrProfessor

Wescanson

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If I can piggyback this thread, how do you feel about those rubber exhaust deflectors we put on the ends of our pipes?

I've got a long one and a short stubby one.
I've tried it without a deflector at all.

You'd think it would affect engine tuning because it's changing the back-pressure, but I can't tell the difference.

  ▲
▲ ▲

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04-23-2009 05:58 PM  9 years agoPost 6
BJames111

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San Diego, California

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You'd think it would affect engine tuning because it's changing the back-pressure, but I can't tell the difference.
You're absolutely correct. BUT, I don't think it makes a big enough difference...FWIW, I have always used the stubby ones.

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04-23-2009 06:07 PM  9 years agoPost 7
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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So does the Kasama header move the power to higher revs or lower revs than stock?

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-23-2009 06:10 PM  9 years agoPost 8
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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I ve tried KASMA header
With SB 18 no problem
With SB 19 no problem
With SB 20 It was a nogo for me could not get the engine running good

And thats my .002 cents

AMA 334000

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04-23-2009 06:14 PM  9 years agoPost 9
BJames111

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San Diego, California

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So does the Kasama header move the power to higher revs or lower revs than stock?
Not sure. Some say that they "feel more" power, but without the engine on a dyno, there's really no sure way to find out.

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04-23-2009 06:17 PM  9 years agoPost 10
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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I felt no diffrence as far as power
As far as installing the pipe yes, easier, Power no

AMA 334000

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04-23-2009 06:48 PM  9 years agoPost 11
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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I ve tried KASMA header

With SB 18 no problem
With SB 19 no problem
With SB 20 It was a nogo for me could not get the engine running good
Thanks. That's good info! Thanks for your post.

I have the SB20 muffler.

What didn't you like about the Kasama with the SB20???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-23-2009 07:39 PM  9 years agoPost 12
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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The KASAMA header
The opening on the KASAMA is different from the Hatori SB20 standard.
Hence change the flow, and back presure on the pipe.

I switched back to standard hatori header and not a problem.

Again the KASAMA header did work with the SB 18 and SB 19 on YS and OS. But i didnt noticed any power change.

AMA 334000

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04-23-2009 10:51 PM  9 years agoPost 13
Futura SE

rrKey Veteran

Fayetteville, Arkansas

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Brian hit the nail exactly on the head. I have two YS SR's and two SB-19's. One in a N9 and one in a 700N. I put the Kasama header on the N9.

All it does is move the power band slightly up a little bit. I run both at 1900 RPM and those helis have the same ratio. I do not like the Kasama header. People say it makes more power. Like Brian said, no it does not. The heli is slightly quicker not since you have more power, but since you are running a higher headspeed. BUT, the engine bogs deeper is bogged.

No free lunch. If you are good at collective management you may get a TINY improvement with it, but the engine does not run as smooth in the mid range and lots of people spool the machine up and start stick banging until you hit the hold switch.

I personally think it runs the SR Longstroke slightly higher than it wants to. Stock SB-19 = 1900 RPM. Kasama = 1930-1950 RPM.

All I'm saying is there is no free lunch.

Norman Ross Jr.

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