RE: 4-stroke fuel--Does anyone really know?  
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RE: 4-stroke fuel--Does anyone really know? - 1/30/2004 8:40:54 PM   
Dart373


 

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From: Chapel Hill, TN, USA
Status: offline 		Thats the way I have run my 4 stroke airplane engines for ever. one of my 61 Magnums has almost 500 hours on it...... still strong.

< Message edited by hobbsy -- 1/30/2004 10:59:31 PM >

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RE: 4-stroke fuel--Does anyone really know? - 1/30/2004 10:54:05 PM   
RCXPLANES



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From: Central Point, OR, USA
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< Message edited by hobbsy -- 1/30/2004 10:58:41 PM >


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RE: 4-stroke fuel--Does anyone really know? - 1/30/2004 11:08:13 PM   
Dart373


 

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< Message edited by hobbsy -- 1/30/2004 11:02:10 PM >

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RE: 4-stroke fuel--Does anyone really know? - 1/30/2004 11:43:59 PM   
RCXPLANES



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< Message edited by hobbsy -- 1/30/2004 11:01:32 PM >


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RE: 4-stroke fuel--Does anyone really know? - 2/2/2004 10:47:15 PM   
Bax


 

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Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline
quote:

ORIGINAL: errolw98

What part of the rod fails on a two stroke before piston siezure? The small end at the wrist pin?


From what we've seen, when the lubrication breaks down, the lower-end of the connecting rod tends to seize to the crankpin and gets twisted off. This will scatter metal shreds throughout the engine. Sometimes the heat from the friction is high enough to actually weld pieces of the rod's bushing onto the crank.

When the rod seizes to the crankpin, you can literally see the blackening on the crankpin from the heat.

We've rarely seen problems with the upper end of the rod. What we have see, though, is congealed/cooked fuel residue that just fills the clearances and makes the rod move stiffly on the wrist pin. Sometimes it's so bad that the rod's not turning on the wrist pin, but the rod/pin assembly's turnin in the piston!

< Message edited by Bax -- 2/2/2004 10:52:45 PM >

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RE: 4-stroke fuel--Does anyone really know? - 4/13/2004 11:34:37 PM   
norbe



Posts: 181
Joined: 5/23/2003
From: miami, FL, USA
Status: offline 		I was looking over this post and I find it very intresting since everyone has his own opinion on a issue that should have no opinions since it's mechanical, and as we know mechanics are like math there is no second opinions just a solution.
Now My question is this, I have had only 4 stroke and Gasoline engines, because I like the way they sound, now I happend to have bought a TT 120Pro 2 Stroke and I would like to know if I can use the same fuel on both a 4 stroke and a 2 stroke or not. I use Omega 5 stroke fuel, and on the bottle it says nothing about oils. I know it is 15% (nitro?), could some one tell me if I risk the funcionality of the TT using 4 stroke fuel?

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RE: 4-stroke fuel--Does anyone really know? - 4/14/2004 1:12:00 AM   
Hobbsy



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Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		As long as there are different brands, different blends, different percentages within those blends and brands there are going to be many differing opinions as to which is best. I use Fox 5% nitro with 20%-50/50 lube in all my two strokes and WildCat 10% Premium and WildCat 15% Premium Extra in my Saitos and Enyas depending on the compression and WildCat ProMix 20% nitro in my YS's, the ProMix has a couple of percentage points of castor in it. These are my choices because they work very well. I do not use any fuel without castor. A couple of my Saitos and one of my Enya's are 13 years old.

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