Hangar Flying > Hangar Flying
carburator -mixture check
dave:
hello all,
i am having abnormal readings on my EGT ..and i already have changed to new probes..
im suspecting the carburator..DOES ANYONE KNOW how to check IF THE CARB IS ADJUSTED PROPERLY?
I HAVE a LYCOMING 0-235 C1B...THAT IS USING A MARVEL SCHEBLER.. MA-3A ...ALL STOCK
CAN ANYONE ASSIST....IM ALSO THINKING OF REMOVING IT..AND MAYBE GETTING A "QUICK KIT"....IT DOES HAVE 450 HOURS ON IT....
ANY ADVISE IS GREATLY APPRECIATED... :(
DJ:
Not enough data.
If you still have the same ststic RPM, and max RPM, and idle. I would not think it is the Card. Those things are bullet proof.
sbschlam:
1. agree with previous reply, not enough info, however
- you could check plugs and exhaust pipes for lots of black carbon , which would be signs of a rich mixture.
- the easy adjustments to the Carb are idle mixture adjustment and idle speed adjustment. (External adjustments ). To restate the obvious the idle mixture adjustment only affects the mixture at IDLE rpms.
- Somewhat more involved, but still not too difficult is float level adjustment, which controls mixture in normal operating range.
For starters I recommend you do some reading. Try www.precisionairmotive.com website, Support, FAQ. They also have a tutorial / exerpts from the MSA handbook. A short read will give you a pretty good understanding of the MA3SPA carbs exact functioning. Better yet buy the handbook and read the whole thing If you are thinking of working on your own carb. This will cost you 15 bucks and an evening or two of reading. Heed the WARNING. If you don't know what you are doing, get some help from someone who does.
Jack:
--- Quote from: "dave" ---hello all,
i am having abnormal readings on my EGT ..and i already have changed to new probes..
im suspecting the carburator..(
--- End quote ---
Need more data. Are you leaning? EGT numbers can change with ambient conditions and altitude.
These carbs are pretty basic. How do your exhaust stacks look after a flight? Upon shutdown, with idle cutoff, do your Rs go up or down??
I normally find most folks aren't leaning properly.
Jack
dave:
:cry:
hi guys...,
the info i need is ..what should be the EGT lean /peak range when checking the mixture on the CARB ( on the ground)..like when it is newly installed..
my egt readings are actually jumping up and down...ERRATIC and altitude or rpm has very little effect on it...the engiine does change sound ..a little....
its not the egt gauge...i already swapped .....
it might the mixture needle or jet....changing settings...
so if someone...knows what the correct "MIXTURE' adjustment./ precedure..is.....welll thank you :lol:
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