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HelicopterEngines Plugs Mufflers Fuel › Novarossi REX H9 Helicopter Tuned Pipe
08-07-2011 02:35 AM  6 years agoPost 1
McKrackinrrProfessor - Lucasville,Ohio - My Posts: All  Forum  Topic

Who's using it on their .90?
What's your opinion of it?

I dig the look of it for sure.

I need to order a pipe tomorrow sooo....

Any truly great pipes for the OS91HZ?

Asking here because the exhaust forum is dead and hasn't had a new post in a month.

I literally never use the word literally right.

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08-07-2011 03:18 AM  6 years agoPost 2
barely can fly

rrApprentice

oxford ga. usa

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Nova engines are high rpm motors in that they make their power at a higher rpm than others, you need a pipe tuned for the os 91.

ATLRC wrecking crew / NCRC

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08-07-2011 03:20 AM  6 years agoPost 3
McKrackin

rrProfessor

Lucasville,Ohio

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This pipe advertises that it is tuned for OS91's.
This is the Novarossi REX H9 Muffler & Header Set. This set includes both 50491 & 40491 muffler and header, as well as all necessary gaskets and mounting hardware. This set is intended for use with .90 class engines, and has been designed specifically for use with Novarossi and O.S. Engines.

I literally never use the word literally right.

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08-07-2011 03:22 AM  6 years agoPost 4
barely can fly

rrApprentice

oxford ga. usa

My Posts: All  Forum  Topic

As far as i know nova does not make a pipe tuned for any other engine but i will look to make sure, be right back.

ATLRC wrecking crew / NCRC

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08-07-2011 03:26 AM  6 years agoPost 5
barely can fly

rrApprentice

oxford ga. usa

My Posts: All  Forum  Topic

Sorry, i see that they make headers that claim to be for both the nova and the os, but the nova 91 makes peak power at 16,500 rpm and the os as far as i can tell makes peak power at 15,500.
I would get a pipe specific to the OS 91, as two strokes are very reliant on the pipe for power production.

ATLRC wrecking crew / NCRC

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08-07-2011 03:30 AM  6 years agoPost 6
barely can fly

rrApprentice

oxford ga. usa

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OS 91HZ makes 3.4 hp at 15,000 rpm which is much lower than the nova 91.

ATLRC wrecking crew / NCRC

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08-07-2011 03:30 AM  6 years agoPost 7
McKrackin

rrProfessor

Lucasville,Ohio

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Got it.Thanks.

Now onward to answers to the questions.

Nova pipe users opinions and what are the truly great 90 size pipes for the OS91.....

I literally never use the word literally right.

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08-07-2011 03:33 AM  6 years agoPost 8
barely can fly

rrApprentice

oxford ga. usa

My Posts: All  Forum  Topic

Only run YS913DS here, sorry can't help with the correct pipe for the OS91HZ.

ATLRC wrecking crew / NCRC

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08-07-2011 03:40 AM  6 years agoPost 9
McKrackin

rrProfessor

Lucasville,Ohio

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Only run YS913DS here, sorry can't help with the correct pipe for the OS91HZ.
Thanks though.Got me looking at peak power RPM and practical RPM.

Hatori claims to be made specifically for the OS91HZ but it comes with a header adapter as well.
The Hatori YS pipe and OS pipe are the same pipe sooo.....

I literally never use the word literally right.

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08-07-2011 12:14 PM  6 years agoPost 10
barely can fly

rrApprentice

oxford ga. usa

My Posts: All  Forum  Topic

Both the YS and OS make power in the 15,000 rpm range, a lot of other pipes out there besides hatori.
Not saying there is anything wrong with hatori pipes, make excellent power but they are expensive for what you get.
Only thing to watch out for on a pipe with a header is the o-rings where they join can wear out from vibration and leak requiring replacement and can cause the engine to not run properly until they are replaced.

ATLRC wrecking crew / NCRC

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08-07-2011 01:22 PM  6 years agoPost 11
helixangle

rrKey Veteran

Mamaroneck, NY - USA

My Posts: All  Forum  Topic

SB19 is for ys engines

SB 18 and 20 is for OS engines, more specifically the Hatori SB 20 is designed for the OS .91 engines

They are expensive, but they are better than most I have flown. I have a pipe from 2008, sold it to a buddy in Jersey, motor and pipe are still making great power, great sound. It just works

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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08-15-2011 02:02 PM  6 years agoPost 12
helinewby

rrKey Veteran

Orlando Florida

My Posts: All  Forum  Topic

Os engine
the SB 20 is the best pipe for your engine! also let me know if you want to sale your Novarossi pipe. Thats what i fly

thk C.B.

Team TSA Models, Team YS, Team Spin Blades..

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08-15-2011 02:59 PM  6 years agoPost 13
gorn

rrElite Veteran

Western Australia

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When I had had my Nova 91 motor and pipe, the thing was a beast.

But exhaust O rings sucked badly.
They would fail between 5 and 10 flights old.

The damn thing always was leaking, and killed my motor in the end.

The motor was amazing, the pipe sucked, and yes I tried other pipes, but none seemed to work in the Nova's RPM ramge.
16500 vs 15500 for OS and YS.

For the love of the hobby

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08-15-2011 03:25 PM  6 years agoPost 14
helinewby

rrKey Veteran

Orlando Florida

My Posts: All  Forum  Topic

Hi Gorn!
You are right on target! I a trying the new direct mount REX pipe now.... along with some other goodies!

http://www.youtube.com/user/helinew...u/2/5c76c100Wyo

thx C.B.

Team TSA Models, Team YS, Team Spin Blades..

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HelicopterEngines Plugs Mufflers Fuel › Novarossi REX H9 Helicopter Tuned Pipe
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