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Cuyuna oil ratio, injection

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Tue Jan 01, 2008 8:46 pm Post subject: Cuyuna oil ratio, injection

OK, so I'm using 40:1 oil ratio (Pennzoil air-cooled oil) per the Cuyuna 

ULII-02 manual.  However, I'm toying with the idea of installing an 

automatic oil mixer made by OMC (Evinrude).  The "Accu-Mix R" goes in the 

fuel line, and is pulse driven, unlike the Rotax gear driven oil injection 

systems, so it can be adapted to any engine.  The only thing is, it's fixed 

at 50:1 ratio.  Some people say the lighter oil ratio is OK with modern 

oils, but I dunno... I like the Pennzoil, it's not a modern synthetic oil 

but it's kept my paramotor engine happy for well over 300 hours... but I 

also like the idea of flying to another airport and being able to refuel 

without the hassle of calculating and mixing oil, and also not worrying 

about the age of the premix.



So, whatcha think?  50:1 OK?  Need to alter the jetting?  Or is there 

another aftermarket oil injection alternative for the Cuyuna?



-Dana

--

  Assassins do it from behind.

apilot(at)surewest.net
Guest

Posted: Tue Jan 01, 2008 9:05 pm Post subject: Cuyuna oil ratio, injection

You can't beat Penns Oil as long as it does not sit for a year or so and coagulate.  Evenrude knows what they are doing too, but they tend to lean toward water cooled engines.

The BaronVonEvil

Joined: 23 Jun 2006
Posts: 76
Location: Walla Walla, WA.

Posted: Wed Jan 02, 2008 12:11 am Post subject: Cuyuna oil ratio, injection

Hi Dana,



I have a 430 Cuyuna on a Maxair Drifter and am running it at 50:1. I work as 

a boat mechanic for an formerly OMC now BRP dealership and have installed 

the Accumix system on a number of boats. They were mostly used for the 

trolling motors to allow tapping in to the main fuel system of an I/O drive.



The Accumix works ok but maybe a little fragile for this application. I have 

seen allot of them leak at the bottom usually because the plastic mixer 

housing has cracked.



A new Accumix  tank is allot more expensive now up to a couple hundred 

dollars or so from the past.



BRP does offer an Mixing cup and it is graduated in a number of ratios and 

varying fuel quantities. It holds about a pint and has a blue lid for 

keeping the bugs & dust out.  I think it runs about 3 bucks.



The Rotax engine driven oil pump works pretty good and they are also used 

on the late 80's and early 90's  Mercury 2cycle Outboards.  The problem is 

adapting the pump to the Cuyuna.



Hope this helps



Carlos G

AKA

BaronVonEvil

---

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Wed Jan 02, 2008 3:54 am Post subject: Cuyuna oil ratio, injection

At 03:10 AM 1/2/2008, Carlos wrote:



 	  Quote: 	
		  The Accumix works ok but maybe a little fragile for this application. I 

have seen allot of them leak at the bottom usually because the plastic 

mixer housing has cracked.



A new Accumix  tank is allot more expensive now up to a couple hundred 

dollars or so from the past.


	


Thanks Carlos,



Do you know how long they were in service before they started 

leaking?  Does leaking mean a failure to deliver oil or just a leak?  For 

obvious reasons I'm more concerned about a sudden failure than a slow leak 

that can be attended to.



An aircraft might not be as tough an environment, not getting the constant 

pounding of a boat in the waves... but OTOH it would be constantly running, 

not just occasionally as if it were just the trolling motor.  Also do you 

know if the small Mikuni fuel pump has enough pressure?  (I know the mixers 

need an Evinrude high volume pump or something like that.)



I can get one, brand new, for $50, from a guy who bought it (for his plane) 

but never installed it.



-Dana



do not archive

--

  Hit any key. With what?

The BaronVonEvil

Joined: 23 Jun 2006
Posts: 76
Location: Walla Walla, WA.

Posted: Wed Jan 02, 2008 10:39 am Post subject: Cuyuna oil ratio, injection

Hi Dana,



I couldnt tell you how long it was before the accumix had problems as not 

many customers tracked their boat operating time. I would guess calendar 

wise maybe a couple of years.



The way they usually failed was to leaking around the fittings at the bottom 

of the tank . Another failure mode was to start adding too much oil to the 

fuel,usually indciated by too much smoke, fouling plugs.



I haven't seen one fail do to lack of oil but if the tank starts leaking oil 

it would be easier to suck air than oil through the lines. I dont know if 

the Mikini Fuel pump is adequate for the accumix.



Dana, I would be reluctant to bet my engine and my butt with an accumix 

onboard my aircraft is what Im saying.  As always the choice is up to you.



Happy New Year



Carlos G.

---

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Thu Jan 03, 2008 5:04 am Post subject: Cuyuna oil ratio, injection

At 01:38 PM 1/2/2008, Carlos wrote:

 	  Quote: 	
		  



The way they usually failed was to leaking...<snip>...I would be reluctant 

to bet my engine and my butt with an accumix onboard my aircraft...


	


Thanks Carlos, that's the kind of information I needed.  Everything else 

I've heard was of the "I knew a guy who heard from a guy who..." nature.  I 

think I will go with my original plan of premix, and a calibrated third 

tank so I can accurately determine how much fuel I'm pumping.



-Dana



--

  OK, I'm weird! But I'm saving up to be eccentric.

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jan 03, 2008 6:22 am Post subject: Cuyuna oil ratio, injection

I

 	  Quote: 	
		   think I will go with my original plan of premix, and a calibrated third 

 tank so I can accurately determine how much fuel I'm pumping.



 -Dana


	




Dana:



I am glad you made that decision.



Back in the 80's, I was very fortunate to be able to do a lot of long 

distance cross country flying in my 447 powered Fire Star.  I never 

considered any other method but pre-mix or mix in the tank.  That's all that 

was available.



Each extended trip started out with 3 gals of Pennzoil in 1 quart 

containers, along with my camping gear and personal gear.  Doesn't take long 

to become very good at estimating fuel burn when flying cross country, using 

the hour meter and a fuel burn of 3.5 to 3.75 gph.  I dumped the oil in the 

tank first, grabbed a lift strut to roll the FS back and forth to mix the 

oil and gas, then filled the tank.  Never had a fuel/oil mix ratio problem 

that I could determine in many hours of cross country flying.



At home it was a no brainer because I fueled out of 5 gal cans.



With this method of fueling and mixing oil I was able to fly in all the 

States east of the Mississippi and some west of the Mississippi River.  We 

also got into Canada far enough to say we had flown over Canadian soil, but 

never attempted to land there.



john h

mkIII - 15F at hauck's holler, alabama

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

rowedenny(at)windstream.n
Guest

Posted: Thu Jan 03, 2008 7:39 am Post subject: Cuyuna oil ratio, injection

 	  Quote: 	
		   john h

 mkIII - 15F at hauck's holler, alabama

 Crap,

Thats what the temp here in western PA is this morning!  I did not think it 
	


ever got that cold in the deep South.



Dennis Rowe

a58r(at)verizon.net
Guest

Posted: Thu Jan 03, 2008 11:56 am Post subject: Cuyuna oil ratio, injection

Think it was +15F, not -15F at Hauck's Hollow...a hyphen vs. a minus 



 regards,

Bob N.    FireFly 070 Old Kolb

http://www.angelfire.com/rpg/ronoy/

do not archive



 



 [quote][b]

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jan 03, 2008 1:54 pm Post subject: Cuyuna oil ratio, injection

Hi Grey Baron:

  

 Felt like it anyhow.  

  

 john h

 mkIII +15F, but felt like -15F.

 [quote]    Think it was +15F, not -15F at Hauck's    Hollow...a hyphen vs. a minus 

      regards,

   Bob N.    FireFly 070 Old Kolb

    



[b]

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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