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  #1  
Old 06-03-2018, 02:33 PM
dtw_rv6 dtw_rv6 is offline
 
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Location: Martinsville, IN
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Default Manifold restrictor plugged with carbon

After 500 hours on my Superior IO360, my manifold pressure gage (cylinder #3 port) quit responding to engine power settings. This is what I found:



Is this normal? I cleaned it with some MEK and safetywire. All is working normally again...
Engine is dual EI and fuel injected.


Don
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  #2  
Old 06-03-2018, 06:15 PM
BillL BillL is offline
 
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My 10-Friend found black goo in his line, it was near solid when cool, then as it warmed, the MAP would work ok. ~200 hrs. The goo is heavy ends from fuel, like pitch. It could easily harden with time.

Was your hose/line clear?
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  #3  
Old 06-03-2018, 06:25 PM
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Planecrazy232 Planecrazy232 is offline
 
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I imagine this could be bad for a electronic ignition engine with MAP for timing.
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  #4  
Old 06-04-2018, 01:11 PM
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PerfTech PerfTech is offline
 
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Quote:
Originally Posted by Planecrazy232 View Post
I imagine this could be bad for a electronic ignition engine with MAP for timing.
. I had this as well with a line going to my map sensor for the
ignition. I moved the pick-up to the carburetor base, eliminating
the problem and gaining a much smoother signal in the process.
The engine actually seems to run a bit better (I think). Thanks,
Allan...
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  #5  
Old 06-09-2018, 04:37 PM
lr172 lr172 is offline
 
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Quote:
Originally Posted by PerfTech View Post
…. I had this as well with a line going to my map sensor for the
ignition. I moved the pick-up to the carburetor base, eliminating
the problem and gaining a much smoother signal in the process.
The engine actually seems to run a bit better (I think). Thanks,
Allan...
I did the same to avoid this problem. There is a lot of reversion in the intake port area and you should expect carbon build up there.

Larry
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  #6  
Old 06-10-2018, 07:04 AM
dtw_rv6 dtw_rv6 is offline
 
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Location: Martinsville, IN
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Unfortunately, this is on a fuel injected engine, and there is no port that I'm aware of near the servo. It took 10 years for this to plug up and the MP readout is a luxury for me with a fixed pitch prop, so I might just have to live with periodic cleaning.

It does affect the spark advance on my electronic ignitions, but that just means they will operate at 0 degrees and shouldn't be a flight safety issue.

It just seemed odd that I would see this concrete-like build-up on the upstream side of the combustion chamber and I was worried that I had a sticking intake. The rebound theory seems to be more likely to me.

Thanks!
Don
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