2 cycle engines and nitro  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> 2 cycle engines and nitro
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2 cycle engines and nitro - 4/27/2005 8:22:31 PM   
strulag



Posts: 409
Joined: 12/2/2004
From: Vancouver, WA, USA
Status: offline 		I'm still confused on what percentage to run with my engine. It seems like on posts it says they higher the better (more power) some people say they run even 30% heli fuel. At my field everybody says that the higher percentage doesn't make a difference and I should run around 5-10%.

The engine I have is an 0S 91 s stroke. What do you guys think I should run in it?

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2007 Resolutions: Do more flying then fixing, Have a plane last at least one season.
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RE: 2 cycle engines and nitro - 4/27/2005 8:26:10 PM   
w8ye



Posts: 17279
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		Your OS four stroke would like something in the 10-15% range. 30% is a waste of money on that engine.

Enjoy,

Jim

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Attended the CutFinger Institute of DirtNap University for years but never did graduate....

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(in reply to strulag)
       Post #: 2

RE: 2 cycle engines and nitro - 4/27/2005 8:28:33 PM   
splatt



Posts: 651
Joined: 1/30/2002
From: splattsville, MN,
Status: offline 		Chances are your OS .91 will be happy with 5-15 % nitro.

Nitro will improve idle and throttle responce.

Going from a 5 to 30 percent will only get another 500- 600 RPM's

A nice muffler will do more.

But since you mentioned nitro I'm sure other will chime in , good luck


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race, race, race. Racing toward my grave

(in reply to strulag)
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RE: 2 cycle engines and nitro - 4/27/2005 8:59:49 PM   
Rcpilot


 

Posts: 6527
Joined: 3/20/2002
From: Arvada, CO, USA
Status: offline
quote:

ORIGINAL: w8ye

Your OS four stroke would like something in the 10-15% range. 30% is a waste of money on that engine.

Enjoy,

Jim


YUP.

Guys running 30% hel fuel are doing that on the Saito 180. It responds well to that fuel.
Unless your flying competition or racing--then paying big $$ for lots of nitro is just pissin' money away. If your engine is a bit small for the plane and you need more power--then don't cook it with more nitro. Buy a bigger engine. Or try a different prop.


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RE: 2 cycle engines and nitro - 4/27/2005 9:16:50 PM   
jaka


 

Posts: 4413
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
Most engines can only tolerate 15% nitro because of their high compression ratio.
Some engines, like the SAITO .180 can be run on as much as 30% nitro.But that is an exception to the rule.
Nitro gives more power provided the engine's compression ratio isn't to high to begin with , other-vise the performance will decline and the engine run very bad.
So adding 5-10% nitro is all what it takes to have a really good running sport engine.
Regards!
Jan K
Sweden


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(in reply to strulag)
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RE: 2 cycle engines and nitro - 4/28/2005 12:14:04 AM   
RC-Captain



Posts: 2963
Joined: 11/12/2002
From: RCHill, NJ, USA
Status: offline 		I run 15% on all three of my engines. OS.40 OS .46fx and MAG .28 xl

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RE: 2 cycle engines and nitro - 4/28/2005 4:25:40 AM   
strulag



Posts: 409
Joined: 12/2/2004
From: Vancouver, WA, USA
Status: offline 		I don't know if it makes a big difference but my engine is 2 cycle.

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2007 Resolutions: Do more flying then fixing, Have a plane last at least one season.

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RE: 2 cycle engines and nitro - 4/28/2005 4:54:36 AM   
Flyboy Dave



Posts: 13360
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		I wouldn't run any more than 15% in it, however....I wouldn't be afraid to add
more oil....castor of course.

FBD.

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An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

(in reply to strulag)
       Post #: 8

RE: 2 cycle engines and nitro - 4/28/2005 11:06:46 AM   
ampa


 

Posts: 181
Joined: 7/6/2004
From: torino, ITALY
Status: offline 		european made engines(moki,webra S.T.,MWWS) are made to run with low or no nitro

(in reply to Flyboy Dave)
       Post #: 9

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