Klonger

My Feedback: (6)

One of the guys at the field told me that I can get more power out of my 2 strokes (46-75 size) by taking off the exhaust diverters....Looking for other opinions. Thanks

C_Watkins

My Feedback: (10)

In most cases, on two stroke engines, yes... the diverter will rob a bit of power.
Best way to prove it to yourself is to fly it with, then without the diverter.

My personal experience has been that it doesn't rob enough power for me to worry about it, and
if I have a plane that can stay a little cleaner, I'm not too upset giving up a couple hundred RPMS.
If I were flying some scale-powered or underpowered planes, I might feel differently.
If I was flying a speed plane, to go fast... I'd ditch the muffler anyhow, and go with a tuned pipe.

KidVermin

My Feedback: (3)

I'll take the max.300 rpm loss over the extra slime on the wings and fuse. Been using them for years and haven't missed any extra power.

depfife

My Feedback: (14)

Representing the other side, I would gladly invest a paper towel and a squirt of cleaner to gain 300 rpm. Take into account that I am a proud member of the dirty plane club. I clean my planes every three or four trips to the field - whether they need it or not. [8D]

Eric

justy_123

I had a deflecter on my O.S 40LA powering a trainer and a guy at my club told the same thing (that it takes away RPM's)
I took the deflecter off on my next flight and noticed the difference.
Even though you get 'junk' all over the model it is worth it.
I bevieve that without a deflector, the engine has a better idile too

John Wells

My Feedback: (10)

I wonder about removing the baffle inside the stock mufflers like the TT46, and OS 160 etc.? What do you guys think? Will removing them decrease the power?

Thanks,

JW

depfife

My Feedback: (14)

My experience is that you get a little more power, a little less pressure in the fuel tank, and a good bit more noise.

Eric

TNRabbit

depfif is right; what you gain in power you will make up for in noise (probably above the legal level for your site) and you'll end up with a lot of dead sticks due to insufficient pressure on your fuel line. if you're that concerned about it, get a tuned pipe.

twinman

My Feedback: (2)

I will agree that with actual tach testing, I have seen 2-300 rpm loss with those plastic deflectors. Perhaps. and I stress perhaps, you could lose less with the next size larger deflector, but good luck holding it on.
I have also seen 200 rpm by removing the internal baffle, but with proper tuning after removal, I have not seen an increase in dead sticks. It is necessary to retune after removal.
Good Luck,
Twinman

jettstarblue

I have removed, or modified all the baffles, cones, ect. in my mufflers. I have never had deadstick/idle problems. I usually use a checkvalve between the exaust, and the tank. 3-500 RPM gains.

JohnVH

My Feedback: (38)

I had a diverter on one of my heli's, in a hover it fell off, the heli gained a couple feet of altitude! So IMO yes they rob power.. But just a little.. I dont use them unless I have to.

I also remove the baffles in mufflers. I have had good results

Antique

My Feedback: (4)

Don't start complaining when you lose your flying site because of noise.

JohnVH

My Feedback: (38)

we wont, an exhaust diverter does nothing for noise.

rajul

My Feedback: (58)

Sorry, but what type(s) of exhaust diverter are you guys talking about ? The short "dubro" type ?

JohnVH

My Feedback: (38)

thats what I was talking about

jettstarblue

I'll NEVER lose it......whaaaahhh!!!!

twinman

My Feedback: (2)

Due to this post, I talked a buddy of mine at the field with two OS LA 46's with these deflectors into tach'n the engines with and without. Had to retune the engines after removal and actually saw a 1000 rpm increase with 10x6's. They were permenately put away.
Twinman.
PS OF course it was a twin!!!

BasinBum

My Feedback: (2)

While your testing the RPM's with and without the diverter you should test how much residue you get with and without. Unless the diverter is long enough to get the end completly out of the prop wash it will still get on the plane, maybe just more spread out and farther back. The prop wash spirals back and catches the exhaust if it isn't outside this swirl.

For the loss of power and to still have residue on the plane I say they are a marketing item as opposed to a useful tool used by experienced modelers.

Tired Old Man

My Feedback: (1)

Every time I have tried a diverter, I've either a loss of power or had an engine that would not run reliably, or both.

If I'm flying glow, I'll take the clean up over the diverter. removing the muffler has always increased the power on the engines I was using, but at the cost of a higher noise level.

jettstarblue

THANK YOU!!

islandflyer

I have been using one of those Dubro diverters for about 5 month on my Funtana with a Saito .91 (over 150 flights).

I never had a dead stick, have way enough power, and have cut down clean-up time by more than half (the oil only gets to the tail area, as opposed to the whole fuse from engine compartment all the way back.

ronwc

My Feedback: (404)

The first thing I do when I buy a new or used engine is to yank off the the exhaust diverter and baffle. Gives me a 1000 RPM extra and little more noise/mess. Plus, IMHO, the engine runs cooler.

rmh

here is an OS 45 FSR with stock muffler and the DuBro "diverter".
It really runs hard on a 10x6 TF and #1 Magnum fuel.
power loss ? not much, if any .
Very quiet in the air and flawless performance even if the old bearings are starting to sing a bit.
I have not run one of these engine in years , but tuning was easy and in the NOBLER- it was very fast --or- flew slowly with instant acceleration.
If you are having trouble with this type diverter - something else is wrong in your setup .

barrelracer

My Feedback: (99)

I think what it all boils down to is what do you prefer.I have tried them on various plane and engine combo's and on some engines they make no diference but on some engines it raises holy hell with getting them to run right.so for my 2 cents worth it comes down to it,s your plane try it they do not cost that much it might be what you are lookiing for if not cut the little tie wrap and put it in flight box to try on something else.

Dukester

My Feedback: (31)

It seems to me that the power loss with a diverter is not necessarily a given when using a diverter. Rather its in the design of the diverter. If the diverter serves to restrict the exhaust flow, then it will rob some power. However, if your diverter area was 2 or 3 times the area of the exhaust outlet, then I would think you could use one successfully with very llittle if any noticeable power loss.

One product that I have not used personally, but gets good comments when someone mentions it is the stuff at http://www.flyquiet.com . They are intended for noise, but would serve well as an exhaust diverter.

Duke