RE: Hi Perf Russian 10cc at a bargain price!  
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RE: Hi Perf Russian 10cc at a bargain price! - 3/27/2008 5:06:53 AM   
XJet


 

Posts: 3462
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		Smaller bearings usually have a higher RPM rating than larger ones - and just look at the size of the bearings in a buggy engine. Those things do 3HP+ and run at 30K RPMs.

The 6902s from RC-Bearings are excellent quality and I haven't had a single one fail yet. It's usually the cages that collapse when a bearing fails -- polymer cages mean these bearings are much less likely to spit their guts through your engine.

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RE: Hi Perf Russian 10cc at a bargain price! - 3/27/2008 7:32:10 AM   
DarZeelon



Posts: 7101
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: online 		PropTop,


This is true...

Many .61 engines also went up in rear bearing size, even if the crankshaft diameter was not changed...

OS .61 engines, for example, traditionally use a 17 mm O/d crankshaft.

The OS.61FSR/SF engines used the 6903 rear bearing, which has a 30 mm O/d, is 7 mm wide, weighs 16 grams and has a 4.6 kN dynamic load rating.

The OS.61FX engines uses the 16003 rear bearing, which has a larger 35 mm O/d, is 8 mm wide, weighs 33.3 grams and has a 6.0 kN dynamic load rating.

That larger, heavier bearing obviously made the crankcase significantly larger and heavier...


But, reasoning with the load rating only, even the 15 mm O/d 6902 should be enough to handle all the loads placed upon it by a .61 engine (4.33 kN dynamic load rating)...

Those bearings are not 'going south' because they're 'overloaded', but because of other reasons, like poor manufacturing quality, for instance...

The load ratings, if someone cares, are for WIB bearings and are taken from the WIB metric bearings page.
.
Their 6902/3 bearings are named 61902/3...


< Message edited by DarZeelon -- 3/27/2008 4:05:29 PM >

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 7:43:32 AM   
Razor-RCU



Posts: 5291
Joined: 3/21/2002
From: Ramona, CA, USA
Status: offline 		SO I just ordered pone of these KMOT specials. I read most o this 12 page thread just now....Great video with the trainer and the engine- amazing performance!

What was the final verdict on an affordable header/pipe combo.? Was there one? I actually have pipes but the header is what I am wondering about---

Keep us posted!


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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 11:38:03 AM   
daven



Posts: 6909
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		Razor, I picked up one of the "on sale" Macs tuned pipes for $23. I haven't tried it yet, but it looks great.

Still haven't decided on the header quite yet, I think KMOTS solution above may work just fine for me.

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 3:33:44 PM   
mmattockx


 

Posts: 2205
Joined: 4/28/2005
From: Calgary, AB, CANADA
Status: offline
quote:

ORIGINAL: Razor-RCU

SO I just ordered pone of these KMOT specials.


Razor,

Has yours gone past the "order processing" stage? I ordered a second one on March 12 and my order is still in process and I have not received any replies to an email asking for the status of my order yet. The first one shipped in a few days, so I am starting to wonder if they have sold out and not pulled the listing yet.

Mark

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 6:36:54 PM   
Kmot



Posts: 7740
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		Holy Crap!!!!!!!!!

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 8:10:40 PM   
Kmot



Posts: 7740
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline
quote:

ORIGINAL: Kmot

Holy Crap!!!!!!!!!

I just ran this engine on my test stand with the tuned pipe. After starting it the first time, I had to shut it down and go get my camcorder and video it.

This is the third run. The engine had a total time of 20 minutes on it, all with FAI fuel.

This time it has a Rossi muffled tuned pipe. The header is 4" in total length. About 3.5" of it sticks out of the stub. I haven't tried to do any tuning of it yet.

Still using the same original Russian glow plug that has been used all along.

Still using Powermaster FAI, 0% no nitro fuel with 20% castor oil.

This time using a Master Airscrew 12x6 prop. CORRECTION! 10X7 PROP!

How does 17, 510 RPM strike you!

I was not ready for how fast it sucked down the fuel!!



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< Message edited by Kmot -- 3/28/2008 10:46:44 PM >

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 8:36:40 PM   
Kmot



Posts: 7740
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		I was wrong...........

< Message edited by Kmot -- 3/28/2008 10:45:25 PM >

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 8:44:31 PM   
Strykaas



Posts: 4107
Joined: 3/21/2003
From: Paris, FRANCE
Status: offline 		insane

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 9:02:09 PM   
DarZeelon



Posts: 7101
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: online 		Tom,


This prop, according to the Reivers PropPower (download the latest version), has a low, 1.0 constant...

Despite this, spinning at this RPM it would need 3.53 HP, which is what a very good marine (un-muffled pipe, water cooled) .91 makes at 23,000 RPM, on 60% nitro...


...No way, Jose!...

Bruce's engine sounded like it was in the vicinity of 14.5K on the Bolly 11.5x6, which is a very nice 2+ HP.

I could not hear your engine running very smoothly; sounding on the border between four-cycling and two-cycling.

I believe that GlowBee tack is amiss, or some quirk 'reading' of the prop blades...


Besides MA limit this prop to 160,000/D, or 13,333 RPM... I don't think that prop would hold at that RPM.


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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 9:59:09 PM   
Kmot



Posts: 7740
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline
quote:

ORIGINAL: DarZeelon

Tom,




...No way, Jose!...







Four cycling? lol...

I nearly crapped my pants when this thing first got on the pipe. That is why I shut it down and got my camcorder. I have never heard an engine rev like that in my backyard. What you can't see in the video is me walking WAY around the engine to get to the camcorder and back again just in case that prop grenaded!

FWIW, in the past I have compared my Glow Bee tach to my analog Royal tach and they read the same.

In any case, that engine was running like a scalded ape!

Does anyone have an audio tach that can record the sound from the video and verify the rpm?

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 10:12:59 PM   
Strykaas



Posts: 4107
Joined: 3/21/2003
From: Paris, FRANCE
Status: offline
quote:

Does anyone have an audio tach that can record the sound from the video and verify the rpm?


You actually have to make another video holding the cam far from the engine, walking past it, and then going on further to some distance, ideally at a constant walking speed, on a straight line. Then Mike can chime in and verify your claims .

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RE: Hi Perf Russian 10cc at a bargain price! - 3/28/2008 10:44:36 PM   
Kmot



Posts: 7740
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		HUGE APOLOGIES!!!

I made a gross error and I am SO SORRY!!!!

While setting up the tuned pipe support last night around midnight and changing props I had it in my mind to use a 12x6 prop.

I just removed the prop and it is a 10x7.

I APOLOGIZE TO EVERYONE FOR MY FOOLISH ERROR!!!

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