RunRyder RC
 4  Topic Subscribe
WATCH
 1 page 849 views
Scorpion Power Scorpion Power
HelicopterEngines Plugs Mufflers Fuel › Can I Run a 1.05 Muffler on a .91HZ-R?
12-02-2016 06:49 AM  11 months agoPost 1
wjvail

rrKey Veteran

Meridian,​Mississippi

My Posts: All  Forum  Topic

I've been thinking about this lately. Can I run run a 1.05 muffler on a .91 DRS engine?

Think about it for a moment. The engines are tuned for the same gear ratios. They should be operating in the same RPM range. The DRS engine doesn't need muffler back pressure. In effect I would just end up with a larger volume pipe. That has the potential for less back-pressure and more power plus there is a good chance the engine would be quieter.

Anyone tried this yet? Any thoughts?

Bill

"Well, Nothing bad can happen now."

PM  EMAIL  GALLERY  Attn:RR  Quote
12-02-2016 03:54 PM  11 months agoPost 2
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

Hey Bill;

Mount it up and try it!

The Hatori 50 pipes are obsoleted when a bigger engine come out. You are supposed to just buy the slightly bigger pipe. 50/56/60.

The rpm range may change very slightly but they are very broad to begin with. Your pipe is working best when the noise is the least - rpm. Most guys don't get this.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-02-2016 07:50 PM  11 months agoPost 3
slickporsche

rrVeteran

American/Philippines

My Posts: All  Forum  Topic

wjvail

I would agree with "four stroker" , and install the muffler and give it go. I have done this on fixed wing, and never noticed anything detrimental, just a slightly quieter, and more mellow tone.

Our heli mufflers are essentially a large expansion chamber, and if you compare them to the mufflers that come with the same displacement fixed wing engine, you will see the size difference immediately. The heli muffler is much larger. Even fixed wing mufflers have become larger over the years.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-02-2016 07:52 PM  11 months agoPost 4
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

the only thing that will happen with a bigger pipe is either you won't be able to tune it for power or it has enough back pressure to tune well

yes I realise it's drs engine

spending time, paying attention

PM  EMAIL  GALLERY  Attn:RR  Quote
12-02-2016 08:07 PM  11 months agoPost 5
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

The Hatori 3D pipes actually have a cone inside and are tuned. The F3C pipes are just expansion mufflers with baffles. If a 3D pipe there will be some change in tuning. But try it. Do you already have the pipe ?

PM  EMAIL  GALLERY  Attn:RR  Quote
12-05-2016 02:50 PM  11 months agoPost 6
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

You can run a 90 pipe on a 105 engine no problem if that helps.

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-05-2016 09:01 PM  11 months agoPost 7
Jerry K

rrKey Veteran

Houston Area

My Posts: All  Forum  Topic

Are you sure it is a muffler and not a silencer :<

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 849 views
Scorpion Power Scorpion Power
HelicopterEngines Plugs Mufflers Fuel › Can I Run a 1.05 Muffler on a .91HZ-R?
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Friday, November 24 - 9:34 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online