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M14P fuel grade requirement

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brian-1927(at)lloyd.com
Guest

Posted: Fri Mar 21, 2008 6:38 pm Post subject: M14P fuel grade requirement

What is the official fuel-grade requirement for the M14P? Is is 80/87,  

93/96, or 100?



Is it any different for the M14PF? I would think it would be as the  

boost is higher.



--

Brian Lloyd                         3191 Western Drive

brian HYPHEN 1927 AT lloyd DOT com    Cameron Park, CA 95682

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry



PGP key ID:          12095C52A32A1B6C

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NC69666(at)AOL.COM
Guest

Posted: Fri Mar 21, 2008 9:15 pm Post subject: M14P fuel grade requirement

M14P 91/96

Sent via BlackBerry by AT&T



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richard.goode(at)russiana
Guest

Posted: Sat Mar 22, 2008 3:07 am Post subject: M14P fuel grade requirement

For the M14P it is 91octane [aviation method] ,which the Russians equate to 95.5 for the automotive method.

There are no figures for the PF,but with a higher boost it's requirement must be higher.

Richard



Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW

United Kingdom



Tel:   +44 (0) 1544 340120

Fax:  +44 (0) 1544 340129

www.russianaeros.com



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n395v

Joined: 10 Jan 2006
Posts: 450

Posted: Sat Mar 22, 2008 5:19 am Post subject: Re: M14P fuel grade requirement

 	  Quote: 	
		  There are no figures for the PF,but with a higher boost it's requirement must be higher 	




I was under the impression that higher compression ratios require highr octane but was unaware that higher boost required higher octane.  If this were the case you would need higher octane at sea level than at 20,000 feet. What does the additional boost do that requires a higher octane?

This could pose an interesting dilemma relative to the higher compression cylinder/pistons Barret is building with the higher ratio blowers as in the PF and the monster blower some in Great Britain have installed.

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_________________
Milt

brian-1927(at)lloyd.com
Guest

Posted: Sat Mar 22, 2008 8:55 am Post subject: M14P fuel grade requirement

On Mar 22, 2008, at 6:19 AM, N395V wrote:

 	  Quote: 	

> There are no figures for the PF,but with a higher boost it's  

> requirement must be higher

 I was under the impression that higher compression ratios require  

 highr octane but was unaware that higher boost required higher octane.

They are the same thing. You are increasing the pressure in the  

cylinder. You can do it with boost or by increasing compression ratio.

 	  Quote: 	
		   If this were the case you would need higher octane at sea level than  

 at 20,000 feet.

In fact, you do. Have you ever noticed that your car pings when you  

floor it but not when running at partial throttle? "Ping" is detonation.

 	  Quote: 	
		   What does the additional boost do that requires a higher octane?

Higher cylinder pressures increase the rate of combustion. At some  

point the mixture detonates rather than burns. Higher octane fuel  

delays the onset of detonation and allows the engine to run with  

higher cylinder pressures prior to ignition.

 	  Quote: 	
		   This could pose an interesting dilemma relative to the higher  

 compression cylinder/pistons Barret is building with the higher  

 ratio blowers as in the PF and the monster blower some in Great  

 Britain have installed.

This is why racing engines require higher-octane fuel. They are  

running with much higher cylinder pressures due to increased  

compression and/or increased boost.

This is one the nice things about the Huosai engine -- it is designed  

to run on 70 octane "white" gas. It will run on any kind of gasoline.

--

Brian Lloyd                         3191 Western Drive

brian HYPHEN 1927 AT lloyd DOT com    Cameron Park, CA 95682

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

PGP key ID:          12095C52A32A1B6C

PGP key fingerprint: 3B1D BA11 4913 3254 B6E0  CC09 1209 5C52 A32A 1B6C

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mark.bitterlich(at)navy.m
Guest

Posted: Mon Mar 24, 2008 11:23 am Post subject: M14P fuel grade requirement

I guess that is why it seems to run very well with a 50/50 mix of 93 octane mogas and 100 octane aviation LL.  



Mark Bitterlich

 



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