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35' Lycoming 851 engine burning very rich and rough

  • Curt Schulze
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09 Feb 2021 22:27 #42188 by Curt Schulze
Replied by Curt Schulze on topic 35' Lycoming 851 engine burning very rich and rough
I have seen many cases that the block needed to be decked as well.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
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09 Feb 2021 20:22 #42179 by johnmereness
Replied by johnmereness on topic 35' Lycoming 851 engine burning very rich and rough
Rich in like black soot and building up at idle OR unrelated and white exhaust and possible head gasket issue ?

JMM

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  • Curt Schulze
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01 Feb 2021 23:15 #42074 by Curt Schulze
Replied by Curt Schulze on topic 35' Lycoming 851 engine burning very rich and rough
I have a EE-1 professionally rebuilt inside and out .

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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  • Darlene Paul
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01 Feb 2021 22:31 #42073 by Darlene Paul
Replied by Darlene Paul on topic 35' Lycoming 851 engine burning very rich and rough
Thanks Mike,sorry it took so long to get back to you

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01 Feb 2021 22:30 #42071 by Darlene Paul
Replied by Darlene Paul on topic 35' Lycoming 851 engine burning very rich and rough
Thanks Brad,
I've noted your suggestion,Starting with the valve cleaning and adjustment.
Then the carb .
I was thinking of using a non original carb and find a better carb that would fit.
The EE-1 has quite a history.
Thanks again.
Paul

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30 Jan 2021 12:34 #42061 by Brad J.
Scraping carbon off these old engines is pretty common. The compression ratios are so low they aren't very efficient. The temps they run at also don't burn carbon like a new vehicle running 210 degrees all the time.

Your powerjet/economizer in the carb could be leaking and it causes extra fuel to run in on lower rpm's. It's the jet under the accelerator pump.

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  • Darlene Paul
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07 Jan 2021 14:58 #41901 by Darlene Paul
Replied by Darlene Paul on topic 35' Lycoming 851 engine burning very rich and rough
Hi Mike,
Been ready your comments on line on other matters.
Thanks for the tips on the gas octane and Carb float.
I'll check on the carb during the re-build.
Big Thanks, Paul

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07 Jan 2021 14:52 #41900 by Darlene Paul
Replied by Darlene Paul on topic 35' Lycoming 851 engine burning very rich and rough
Thanks Kurt, Your opinion is appreciated. Paul

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  • mikespeed35
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07 Jan 2021 06:11 - 07 Jan 2021 06:13 #41898 by mikespeed35
Replied by mikespeed35 on topic 35' Lycoming 851 engine burning very rich and rough
Does your carb. float have a hole in it and has sunk to the bottom of the bowl. Would cause most of the problems you are having. Not sure what you mean by "set the dist. at upper limits of advance"? 93 octane is not needed for that engine. If you are removing the valves might be a good time to grind them if needed. There was a article in the Newsletter some time ago about how to do that in the car.
CORDiallyMike

Mike Huffman
Last edit: 07 Jan 2021 06:13 by mikespeed35.

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  • Curt Schulze
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07 Jan 2021 01:38 #41896 by Curt Schulze
Replied by Curt Schulze on topic 35' Lycoming 851 engine burning very rich and rough
Champ J6's are just fine for non s/c 34-36 6 & 8 engines.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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  • Darlene Paul
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06 Jan 2021 22:00 #41895 by Darlene Paul
Replied by Darlene Paul on topic 35' Lycoming 851 engine burning very rich and rough
Thanks Kurt I've been following you on the forum.
My 851 is not s/c.
I thought the std 851 plug was a Champion J6.
But I not trying to stay original with the plugs
Would you continue the J6 to get clean burning.

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06 Jan 2021 15:54 #41893 by Curt Schulze
Replied by Curt Schulze on topic 35' Lycoming 851 engine burning very rich and rough
The plugs that s/c engines came with new, Champion J-9.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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  • Darlene Paul
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06 Jan 2021 15:00 #41892 by Darlene Paul
Replied by Darlene Paul on topic 35' Lycoming 851 engine burning very rich and rough
Kurt,
Thanks on the jets,
what spark plug do you use ??
Thank You Paul

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  • Curt Schulze
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06 Jan 2021 13:15 #41890 by Curt Schulze
Replied by Curt Schulze on topic 35' Lycoming 851 engine burning very rich and rough
Someone in the past may have drilled out the jets to get more power........

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
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  • Darlene Paul
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05 Jan 2021 21:56 #41889 by Darlene Paul
Removed head, carbon buildup so thick it could be scraped off with a putty knife.
going to adjust valves,but now going to remove valves and clean them first.
Been using Sunoco gas 93 octane.
Going to have someone re-build carb and try to lean the mixture.
Them after the valves are adjusted and back together ,was going to set distributor on the upper limit of the advance.
With this info, what heat range spark plug or what brand and number spark plug are others using?
Any advice would be more than welcome.
Thanks in advance. Paul

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