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Leaded gasoline and two stroke oil recommendation

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Paul A. Franz, P.E.

Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA

Posted: Tue Dec 08, 2009 5:43 pm Post subject: Leaded gasoline and two stroke oil recommendation

On Tue, December 8, 2009 3:33 pm, WurlyBird wrote:

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 	  Quote: 	
		   My buddy who has many thousand hours behind and in front of 2 strokes told me to use

 the air cooled 2 stroke oil because even though it is water cooled it burns like an

 air cooled as far as temps go.  It is much higher in performance then what the water

 cooled 2 stroke oil is meant for.


	


In the tests that Lockwood did with Rotax and Pennzoil-Quaker State it looks to me

like there is little difference between the Outboard formulation (water cooled) and

the Air cooled formulation:



<http://www.ultralightnews.com/features/oiltest.htm>   (link courtesy of Guy)



Both performed much better than a mineral oil or synthetic in comparison. Their tests

were done using premix 50:1 with premium unleaded gasoline (no alcohol). They pointed

out that the results would likely have been better using a synthetic with a leaner

(100:1) premix but were concerned about corrosion due to the minimal amount of

residual oil left on bearing surfaces when the engine was not running for extended

periods asis often the case with airplanes left sitting in hangars for days or even

longer at a time.



As I understand it, fouling that occurs on the piston rings will reduce the conductive

heat transfer coefficient between the piston and the cylinder wall causing the piston

to be too hot. Also fouling on the upper surface of the piston and in the cylinder

head effectively raises the compression ratio which could lead to detonation and

consequently severe engine damage. Lead in gasoline causes more deposits and it seems

to me that two strokes are more vulnerable to damage due to these deposits. There are

additives that can be used to help with this problem and probably you should carry

enough to treat the Avgas you have to buy on a cross country trip.



Those Lockwood/Pennzoil tests didn't compare their product to other formulations so I

would say they are probably not the only choice but appear to be satisfactory two

stroke oils for Rotax engines.



One of our list members, "Leonard Perry" <akflyer_2000(at)yahoo.com> has a great deal of

experience with Rotax two strokes in airplanes and in snowmobiles and that is in

Alaska. He has recommended and uses a Citgo two stroke oil. Besides being good, it

also offers price advantage.



Here's the reference sheet for SUPERGARD® Sea & Snow® 2-Cycle Engine Oil which is a

synthetic blend. Use when TC-W3 oils are not recommended.

<http://www.docs.citgo.com/msds_pi/10008.pdf>



I think Lenny uses SUPERGARD® Air Cooled 2-Cycle Engine Oil.

SUPERGARD Air Cooled is a premium performance lubricant designed for use in all

air-cooled two stroke cycle engines.

<http://www.docs.citgo.com/msds_pi/10009.pdf>



I am inclined to use one of those simply because Lenny said so. I would consider

getting an anti-lead fouling additive to mix with Avgas (100LL) when you must use it.

Many are sold with the TCP designation which originally stood for tricresylphospate. I

believe the toxicity is so high that it is no longer marketed but functional

substitutes are still called TCP. Hopefully Lenny will comment to verify what I've

said.

-- 

Paul A. Franz

Registration/Aircraft - N14UW/Merlin GT

Engine/Prop - Rotax 914/NSI CAP

Bellevue WA



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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office

akflyer

Joined: 07 May 2007
Posts: 574
Location: Soldotna AK

Posted: Wed Dec 09, 2009 7:26 am Post subject: Re: Leaded gasoline and two stroke oil recommendation

Here's the reference sheet for SUPERGARDï¿½ Sea & Snowï¿½ 2-Cycle Engine Oil which is a

synthetic blend. Use when TC-W3 oils are not recommended.

<http> 



Paul, this is what I use.  In fact, I just bought another 40 gallons of it, so I should be good to go for awhile.



We use it in the planes, boats and snow machines with great results.  No issues to date, with 10s of thousands of collective miles and hours and not one oil related issue.  At 12 bucks a gallon, I am sticking with it.

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_________________
DO NOT ARCHIVE
Leonard Perry aka SNAKE
Soldotna AK
Avid "C" / Mk IV
582 (147 hrs and counting on the rebuild)
IVO IFA
Full Lotus 1450
#1 snake oil salesman since 1-22-2009

I would rather die trying to live, than to live trying not to die....

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