krayzc-RCU

My Feedback: (31)

i am getting 7000 on a 22 x 8 Menz with a v-stack 25 gallons of petro

22 x 8 Menz w/out a stack on a 3.2 3 gallons 6700 RPM

21 x10 Mejzlik 7500

21 x 10 Menz 6800-6900

JohnnyJ

My Feedback: (1)

On its third gallon.
No V-stack.
TNC tach.
6600 RPM on a Pro Zinger 22x10
6800 RPM on a Menz 22x10 Std.
The Menz has superior performance in the air.
John

JohnVH

My Feedback: (38)

I got 6000 on a 22x10 pro zinger today, at sealevel and 75*. What mix ratio you guys run? Mine seems a tad low on rpm, got to find out why.

krayzc-RCU

My Feedback: (31)

i run amsoil 50 to 1 there is also a amsoil thats made that is required to be mixed at 100 to 1. brison uses the hard clyinders. They told me to prop mine for 6500 to 7500 on the ground when i called them over 40 gallons ago. This made me switched out the following 22 x 10 props that i tried:

22 x10 rcs maple 6150-6300
22 x10 futz 6000-6050
22 x10 menz 6400-6500
22 x 10 fortes 6250-6350

Now i only run 21 x 10 or 22 x 8.
the motor did great on those 22 x 10 props but Brison says i could over work the girl

all of the above reading were when i had 2 gallons on the motor

now 40+ gallons
22 x 8 mezn 7000-7250
22 x 8 Mejzlik 7150
22 x 8 Bamula 6930

JohnVH

My Feedback: (38)

OK, so Im not totally out of line getting 6100 or so on a ProZinger 22x10? With a 3W 20x10 I get about 6750.

I think there is about 3 or so gallons on it.

At this point it is pretty weak. Hope it gets better! The Moki 1.8 had about the same pull.

RC51

My Feedback: (1)

Brison 3.2 with standard inline muffler

MenzS 21X8 = 7600 rpm AMSOIL 100:1
Zinger Pro 22X8 = 7200 rpm AMSOIL 100:1

These numbers were verified with two different tachs.
I bought this engine used but I had it tuned at Brison and I have personally run about 12 gallons through it.
It is a monster. I prefer the 21X8 MenzS. Makes my DP Extra truly ballistic.

JohnVH

My Feedback: (38)

holy cow, those are great numbers!! Maybe I need to try some amsoil!?

JohnnyJ

My Feedback: (1)

Menz 21x10 "S" @ 7100 rpm.
Amsoil series 2000 2-cycle mixed as recommended at 50-1.
Unlimited on my 16.3 lb Sukhoi and some speed too!
Thanks
John

krayzc-RCU

My Feedback: (31)

what all muffers are we running?

i am running a J&A Peacekeeper

JohnVH

My Feedback: (38)

This is what Im using

http://www.rcuniverse.com/attachment...postid=1228601

BUT, I also got this muffler with it, have not tried it yet.

http://www.rcuniverse.com/attachment...&postid=804404

JohnVH

My Feedback: (38)

OK, just got done running it again, I tried playing with the timing but found no RPM increase in the little adjustments I did so I put it back.

I reset the needles to what the book says, then ran it, only get about 6700-6750 on the 20x10 with the first muffler shown in the above links.

So, I tried that other muffler, man is it loud, my ears are ringing, but it picked up a bit of rpm. Right off the bat of starting it it hit 7100 but then slowed to a bit over 6900 and that is the best I can get out of it now.

what do you think? Just need more time?

JohnnyJ

My Feedback: (1)

Menz 21x10 "S" @ 7100 rpm.
Amsoil series 2000 2-cycle mixed as recommended at 50-1.
Unlimited on my 16.3 lb Sukhoi and some speed too!
Bisson pitts muffler with the pinched ends cut off.
I think I gained about 100 rpm from this mod.
The high speed needle is tweaked to max rpm and the low speed needle is as lean as I can go and still maintain a decent transition.
I do not like running rich......it fouls plugs, makes low power, makes carbon deposits, and can cause rings to stick/seize.
Thanks
John

JohnnyJ

My Feedback: (1)

Hello,
More 3.2 numbers
Same equipment and gas.
This time at an OAT of +2 degrees C giving me a density altitude of 1000 ASL.
Beautiful December day!
My previous numbers were at an OAT of +25 to +30 degrees C giving me a density altitude of 4000 ASL.

Menz S 21x10 6800 rpm
Menz S 22x10 6600
Menz U 22x10 7200
Menz U 23x10 6200
Bambula 22x8 6400
Bambula 22x10 5700
Bambula 20x10 7300

John

Geistware

My Feedback: (16)

I have a new one but I need to check my tach reading.
I am using a 20x8 now, but I know I am underpropping the engine.

flipflop

Alright! Thanks John. I've been looking for some rpm numbers on the Bambula 22x8. My Poulan 60 turned mine at 6450rpm and I was wondering how this compared to some of the other motors out there. I know the Bambulas are pretty heavy loads but they sure seem to pull well in the air. This combo should work fine on my Wildhare Edge.

krayzc-RCU

My Feedback: (31)

your numbers will get even better with time ......

Geistware

My Feedback: (16)

I am getting 7250 rpm on a 21x8NX propeller with about 1/2 gallon through it.

WilsonFlyer

My Feedback: (13)

From reading this thread, it seems to me that some of the misconception leftover from running glow engines is seeping in here. What you should want is the best performance from your engine running at the lowest possible RPMs pulling and braking like you need it to (propped properly).

RPM's don't matter worth a hill of beans so long as they are high enough for the engine to be running optimally (full advance). Let's be careful (talking to myself here too because I'm guilty too sometimes even though I know better) about thinking that we want our gas engines turning > 10k RPMs just because our glow engines do. RPMs don't equate to power directly. I guess that's what I'm really trying to say.

JohnnyJ

My Feedback: (1)

Hi,
All engines (glow or gas)develop maximum power(torque) at a certain rpm.
I try to prop my engines so they turn slightly above that rpm.
Some experimentation and/or measurement is required to find that out.
I've been aiming for mid to high 6000's for my 3.2.
Having said that, the best prop for my engine/airframe/flying style combo might turn at an even higher rpm.
Horsepower numbers should not be used to evaluate engines since they include the dimension of time in the calculations and is therefore an intangible figure.
Power, also known as torque, is really the only thing the engine is producing.
Thanks
John

krayzc-RCU

My Feedback: (31)

i think this type thread helps as folks are breaking in their engine to have a reference and also to trobleshoot those needles h/l.

Geistware

My Feedback: (16)

krayzc, I thought you had a 40% plane, what planes do you have your two Brison 3.2's in?

krayzc-RCU

My Feedback: (31)

AW Edge and DP Extra. i pulled the brison off the AW Edge last month and gave the plane away. She was a good girl to me 350+ flights. i am looking at the WH Edge as my new plane, however i am keeping my options open. Yes i do have a 40% Radiocraft that thing will outfly any of my stuff it makes any move from IMAC to 3d very very easy and pretty. If not worth me getting rid of my motors so i will have 27-31% planes as long as they keep putting them out, once you have the motor and sevos the planes are the easy part.

Geistware

My Feedback: (16)

Great shoot. I still have to get up there and fly with you. My Grandma was a little upset I didn't come home for christmas. I have to do it this year, and I plan to bring a plane with me!

excaliber

There are some good comments regarding this subject. But there are also some important issues to deal with as well
1) type of prop, thin blade, wide blade,stiff blade etc.
2) Mfg of the fuel(gas) and the oil as well
3) ratio of oil to fuel
4) location of where the engine is run and what altitude.
5) ignition, magneto or electronic either throttle coupled or auto advance.
current hp numbers are a numbers game. what you must do is question the mfg of the engine on just how the hp numbers were obtained. with what prop,fuel/mix etc.
What you want is Peak Torque Horsepower, and the only way to get that is via a dyno.
As a note, Nicklesil is a trade name for Mahle Cylinders, not the engine mfg.
Also applies to Sach, Husky and at one time Stihl.

Use the combination that works best for your specific application.

I have a 20# Suchoi on a TS52 swinging a 24X8 @ 6100 With a TNC Tach on 87oct @80:1 Amsoil
And it seems to do everything I want it to do.
But thats my style.

Geistware

My Feedback: (16)

Lets see, I am getting 7250 using an Airwild 21x8nx and a mixture of Amsoil 100:1 and Castrol 2 cycle synth oil. (50:1)