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DougG 
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Joined: 20 Sep 2009
Location: Mo
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 Topic: 190 gasser exhaust manifold and today's gas
Posted: 07 Sep 2016 at 6:34pm |
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I have a new to me 190 gasser that I've been brushogging with and working the crap out of it, been noticing the exhaust manifold is turning white, thinking it's from heat and this manifold is the only one I've seen not broke or welded, so my question is, with today's gas should I be putting stuff in it to get more octane?Make it burn better? This thing is almost 50 years old,,, and great shape, wanna treat her right and not break the exhaust manifold!
Edited by DougG - 07 Sep 2016 at 6:36pm
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Tcmtech
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Joined: 15 Apr 2015
Location: Minot ND
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Posted: 07 Sep 2016 at 7:54pm |
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Like crusty white on the outside or powdery white on the inside or something else?
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DougG
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Posted: 07 Sep 2016 at 8:36pm |
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Crusty white on the outside
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DougS
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Location: Iowa
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Posted: 07 Sep 2016 at 9:11pm |
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I wouldn't think the gas would cause the outside of the manifold to turn any color. Since the tractor is new to you it could be that the previous owner painted the manifold with a not so heat resistant heat resistant paint and that is what is turning white.
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Carl(NWWI)
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Location: NW WI
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Posted: 07 Sep 2016 at 10:40pm |
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The 190 gas that's sitting at my place looks the same. White, and I've seen a few others like it too. I was curious on why myself.
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CTuckerNWIL
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Location: NW Illinois
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Posted: 07 Sep 2016 at 10:48pm |
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If you are running lean, the manifold and engine will run hotter than "normal". Maybe it needs a bit more fuel?
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PaulB
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Location: Rocky Ridge Md
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Posted: 08 Sep 2016 at 6:19am |
 CTuckerNWIL wrote:
If you are running lean, the manifold and engine will run hotter than "normal". Maybe it needs a bit more fuel?
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Most of today's gas is "oxygenated" and runs leaner that normal gasoline will. Check to see if Non-Oxy or No ethanol gas is available in your area. Beyond that richen up the main jet.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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SteveMaskey(MO)
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Posted: 08 Sep 2016 at 7:59am |
They run hot. I have had a XT gas for 30+ years. They
will crack and warp if you pull them hard. When pulling them at nite the
manifold and muffler will be cherry red. I have a service bulletin that tells to
drill the mounting holes out to a larger size to give it more room to expand and
contract. t.
Edited by SteveMaskey(MO) - 08 Sep 2016 at 8:01am
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 08 Sep 2016 at 8:44am |
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Standard procedure in gasoline piston aircraft engines is to set the mixture "full" rich for take off, then once in the air lean the mixture to raise the exhaust gas temperature to about 500 degrees F for best economy and still decent power for level flight. The exhaust runs cooler with the full rich mixture and the engine produces more power.
I have a 1949 vintage Onan 5 KW AC generator powered by a Continental Y-91 21 HP engine. Its carburetor can run gaseous fuel, like LP, NG, or coal gas and had a mixture adjustment because of the wide range of coal gas properties. It also allows for gasoline and the high speed jet wasn't adjustable. Even with a very light load under 1 KW, it drank a gallon an hour. I made a needle for the high speed jet and with a thermocouple in the exhaust stream I weaned it of fuel down to less than a half gallon an hour and raised the exhaust temperature about 300 degrees F. I haven't run it it a while, but I've not noticed any effect on the exhaust manifold.
For the 190, run it richer and the exhaust manifold will run cooler, but the fuel bill will go up significantly.
Gerald J.
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