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MOGAS IN THE CJ REPLY

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vectorwarbirds(at)aol.com
Guest

Posted: Mon Nov 12, 2007 4:10 pm Post subject: MOGAS IN THE CJ REPLY

Sorry it took so long to reply, just back from the Nellis AFB show.  As I said we have been running mogas in both the CJ and Yak for several years now.  The CJ was designed to run on 70oct so 87 is not a problem.  The amount of lead in 100LL is almost nil, but since we cannot always get mogas and all the airshow serve 100LL we get enough of that to put our 100LL to mogas ratio at about 50/50.  I have had two jugs off now for leaking base gaskets and have inspected the valves for unusual wear (old race car mechanic I was) and have found no difference between the engines that run 100 vs mogas. The bigger problem I think is people not taking the time to set each valve four times when adjusting the valves and then ending up with a tight one and then burned.  So like I said we have been happily running along now for about 2000hrs total on regular old 87 oct without a single problem.  Be advised tho that you ca  nnot run ethanol or really crappy gas.  We use the Peterson Mogas STC fuel tester when buying gas out and about.  Once we have found a local station that we could test several times as good we just stick with their fuel and only test once a awhile.  NO ETHANOL THO it rots the rubber hoses from the inside out. We have never found an airport that had ethanol in the fuel they sold.

 

 The engine runs better as 87 oct produces more power than 100LL, remember that our 6:1 compression ration engines don't need hi octane fuel, so that is just a waste.  We see cleaner plugs (auto plugs now)  and just a tag lower cylinder head temps (have a nine cyl gauge).  

 

 One thing we do, and I can't really say why, is that we do run Marvel Mystery Oil in the fuel, I just dump in one quart per 90 gals of fuel in my truck tanker and let it go at that.  I don't know if it really does anything but I figure it can't hurt the valve guides to have a little oil running around.  Its only about 2 bucks a qt at Wal mart so what the hell.

 

 So thats my two cents, I have put over 4000 gals of mogas through my CJ engine with nary a burp, in my warped mind that is $6000.00 in fuel savings over 100LL.  Thats buys a lot of Rum my friends!!

 

 Email me if you want any further info on my truck tanker set up or mogas use.  I also have a web site that lists all the airports that carry mogas, many back east but few out west.  I did tho fly all the way to Sun and Fun and back on mogas, which was never over $2.88 a gallon!!

 

 Regards All!

 GBunn

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brian-1927(at)lloyd.com
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Posted: Mon Nov 12, 2007 5:02 pm Post subject: MOGAS IN THE CJ REPLY

On Nov 12, 2007, at 4:08 PM, vectorwarbirds(at)aol.com wrote:



 	  Quote: 	
		   Sorry it took so long to reply, just back from the Nellis AFB  

 show.  As I said we have been running mogas in both the CJ and Yak  

 for several years now.  The CJ was designed to run on 70oct so 87  

 is not a problem.


	


I would add one thing to that. The way that octane is measured for  

mogas and for avgas is different. The rule of thumb is that the (R+M)/ 

2 method used for mogas results in an octane rating about 5 points  

higher than the technique used for avgas. For example, 87 octane  

mogas is approximately equivalent to 82 octane avgas.



 	  Quote: 	
		   The amount of lead in 100LL is almost nil,


	


Sorry, but I need to disagree with you here. There is a LOT of lead  

in 100LL. Don't let the 'LL' fool you. 100LL still has about six  

times the lead of 80/87 avgas and way more than any leaded mogas ever  

had. 100LL is low-lead only when compared to the old 100/130 octane  

"green gas".



 	  Quote: 	
		   but since we cannot always get mogas and all the airshow serve  

 100LL we get enough of that to put our 100LL to mogas ratio at  

 about 50/50.  I have had two jugs off now for leaking base gaskets  

 and have inspected the valves for unusual wear (old race car  

 mechanic I was) and have found no difference between the engines  

 that run 100 vs mogas. The bigger problem I think is people not  

 taking the time to set each valve four times when adjusting the  

 valves and then ending up with a tight one and then burned.  So  

 like I said we have been happily running along now for about  

 2000hrs total on regular old 87 oct without a single problem.  Be  

 advised tho that you ca nnot run ethanol or really crappy gas.  We  

 use the Peterson Mogas STC fuel tester when buying gas out and  

 about.  Once we have found a local station that we could test  

 several times as good we just stick with their fuel and only test  

 once a awhile.  NO ETHANOL THO it rots the rubber hoses from the  

 inside out. We have never found an airport that had ethanol in the  

 fuel they sold.



 The engine runs better as 87 oct produces more power than 100LL,


	


Again, I believe you are mistaken. Gasoline is gasoline. The energy  

contained in gasoline is pretty constant regardless of where or how  

it is made. The octane rating only has to do with the anti-knock  

qualities of the fuel, not any energy content. A change in energy  

content would probably require a change in mixture as well and our  

carbs don't know how to change mixture without our help.



 	  Quote: 	
		   remember that our 6:1 compression ration engines don't need hi  

 octane fuel, so that is just a waste.  We see cleaner plugs (auto  

 plugs now)  and just a tag lower cylinder head temps (have a nine  

 cyl gauge).


	


I agree 100%. Plugs seem to last a lot longer with mogas than with  

avgas.



 	  Quote: 	
		   One thing we do, and I can't really say why, is that we do run  

 Marvel Mystery Oil in the fuel, I just dump in one quart per 90  

 gals of fuel in my truck tanker and let it go at that.  I don't  

 know if it really does anything but I figure it can't hurt the  

 valve guides to have a little oil running around.  Its only about 2  

 bucks a qt at Wal mart so what the hell.



 So thats my two cents, I have put over 4000 gals of mogas through  

 my CJ engine with nary a burp, in my warped mind that is $6000.00  

 in fuel savings over 100LL.  Thats buys a lot of Rum my friends!!



 Email me if you want any further info on my truck tanker set up or  

 mogas use.  I also have a web site that lists all the airports that  

 carry mogas, many back east but few out west.  I did tho fly all  

 the way to Sun and Fun and back on mogas, which was never over  

 $2.88 a gallon!!


	


We can't seem to get mogas without alcohol here in the PRC (People's  

Republic of California) anymore. More's the pity.



--

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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l39parts(at)hotmail.com
Guest

Posted: Sun Nov 18, 2007 4:21 pm Post subject: MOGAS IN THE CJ REPLY

The amount of lead in 100LL is NOT almost nil.  100LL has 3-4 ml/gallon and that is a lot.

  	  Quote: 	
		    To: Yak-List(at)matronics.com

Subject: Re: MOGAS IN THE CJ REPLY

Date: Mon, 12 Nov 2007 19:08:44 -0500

From: vectorwarbirds(at)aol.com

Sorry it took so long to reply, just back from the Nellis AFB show.  As I said we have been running mogas in both the CJ and Yak for several years now.  The CJ was designed to run on 70oct so 87 is not a problem.  The amount of lead in 100LL is almost nil, but since we cannot always get mogas and all the airshow serve 100LL we get enough of that to put our 100LL to mogas ratio at about 50/50.  I have had two jugs off now for leaking base gaskets and have inspected the valves for unusual wear (old race car mechanic I was) and have found no difference between the engines that run 100 vs mogas. The bigger problem I think is people not taking the time to set each valve four times when adjusting the valves and then ending up with a tight one and then burned.  So like I said we have been happily running along now for about 2000hrs total on regular old 87 oct without a single problem.  Be advised tho that you ca nnot run ethanol or really crappy gas.  We use the Peterson Mogas STC fuel tester when buying gas out and about.  Once we have found a local station that we could test several times as good we just stick with their fuel and only test once a awhile.  NO ETHANOL THO it rots the rubber hoses from the inside out. We have never found an airport that had ethanol in the fuel they sold.

The engine runs better as 87 oct produces more power than 100LL, remember that our 6:1 compression ration engines don't need hi octane fuel, so that is just a waste.  We see cleaner plugs (auto plugs now)  and just a tag lower cylinder head temps (have a nine cyl gauge).  

One thing we do, and I can't really say why, is that we do run Marvel Mystery Oil in the fuel, I just dump in one quart per 90 gals of fuel in my truck tanker and let it go at that.  I don't know if it really does anything but I figure it can't hurt the valve guides to have a little oil running around.  Its only about 2 bucks a qt at Wal mart so what the hell.

So thats my two cents, I have put over 4000 gals of mogas through my CJ engine with nary a burp, in my warped mind that is $6000.00 in fuel savings over 100LL.  Thats buys a lot of Rum my friends!!

Email me if you want any further info on my truck tanker set up or mogas use.  I also have a web site that lists all the airports that carry mogas, many back east but few out west.  I did tho fly all the way to Sun and Fun and back on mogas, which was never over $2.88 a gallon!!

Regards All!

GBunn

   Email and AIM finally together. You've gotta check out free AOL Mail!

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