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Engine roughness at low power, 82% RPM?

 
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1906



Joined: 30 Nov 2018
Posts: 58

PostPosted: Fri Jul 02, 2021 11:49 am    Post subject: Engine roughness at low power, 82% RPM? Reply with quote

One of the M14Ps I fly seems to be rougher (not quite a popping sound but different than usual and has added vibration) close to landing. 82%, low throttle (very first notch on the Russian manifold pressure gauge or so). Both have MTV9 props which tend to prop brake during these conditions but the other engine is fairly smooth in comparison. It does have less than 200 hours on the engine whereas this one is about 620.

Any ideas?


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dsavarese0812(at)bellsout
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PostPosted: Fri Jul 02, 2021 12:02 pm    Post subject: Engine roughness at low power, 82% RPM? Reply with quote

Check fir intake leaks. Especially if it has an intake drain kit. Also check all intake gland nuts.
Dennis

Sent from my iPhone

Quote:
On Jul 2, 2021, at 3:51 PM, 1906 <zmadwolf(at)gmail.com> wrote:



One of the M14Ps I fly seems to be rougher (not quite a popping sound but different than usual and has added vibration) close to landing. 82%, low throttle (very first notch on the Russian manifold pressure gauge or so). Both have MTV9 props which tend to prop brake during these conditions but the other engine is fairly smooth in comparison. It does have less than 200 hours on the engine whereas this one is about 620.

Any ideas?




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dsavarese0812(at)bellsout
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PostPosted: Fri Jul 02, 2021 12:10 pm    Post subject: Engine roughness at low power, 82% RPM? Reply with quote

Also check the condition of the manifold pressure hose and primer hose.
Dennis

Sent from my iPhone

Quote:
On Jul 2, 2021, at 4:04 PM, Anthony Savarese <dsavarese0812(at)bellsouth.net> wrote:

Check fir intake leaks. Especially if it has an intake drain kit. Also check all intake gland nuts.
Dennis

Sent from my iPhone

> On Jul 2, 2021, at 3:51 PM, 1906 <zmadwolf(at)gmail.com> wrote:
>
> 
>
> One of the M14Ps I fly seems to be rougher (not quite a popping sound but different than usual and has added vibration) close to landing. 82%, low throttle (very first notch on the Russian manifold pressure gauge or so). Both have MTV9 props which tend to prop brake during these conditions but the other engine is fairly smooth in comparison. It does have less than 200 hours on the engine whereas this one is about 620.
>
> Any ideas?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=502686#502686
>
>
>
>
>
>
>
>
>


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1906



Joined: 30 Nov 2018
Posts: 58

PostPosted: Fri Jul 02, 2021 12:11 pm    Post subject: Re: Engine roughness at low power, 82% RPM? Reply with quote

Thanks Dennis. I figured it might be an intake leak. Will do.

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1906



Joined: 30 Nov 2018
Posts: 58

PostPosted: Fri Jul 02, 2021 12:33 pm    Post subject: Re: Engine roughness at low power, 82% RPM? Reply with quote

One more thing - is there an easy way to determine which intake tube might be the culprit? Or might as well do the gaskets on all?

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dsavarese0812(at)bellsout
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PostPosted: Fri Jul 02, 2021 2:17 pm    Post subject: Engine roughness at low power, 82% RPM? Reply with quote

The only way I know is to spray the suspected area with propane or carb cleaner with the engine running. But carb cleaner is flammable. Best to troubleshoot this when the engine is cold. So if you use carb cleaner be very careful. What you’re looking for is the engine RPM to increase if there is a leak wherever you spay.
Dennis

Sent from my iPhone

Quote:
On Jul 2, 2021, at 4:36 PM, 1906 <zmadwolf(at)gmail.com> wrote:



One more thing - is there an easy way to determine which intake tube might be the culprit? Or might as well do the gaskets on all?




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=502690#502690











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markbitterlich(at)embarqm
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PostPosted: Fri Jul 02, 2021 4:03 pm    Post subject: Engine roughness at low power, 82% RPM? Reply with quote

How about Russian spark plug wires?

R/S
Mark
-------- Original message --------
From: Anthony Savarese <dsavarese0812(at)bellsouth.net>
Date: 7/2/21 6:21 PM (GMT-05:00)
To: yak-list(at)matronics.com
Subject: Re: Yak-List: Re: Engine roughness at low power, 82% RPM?

--> Yak-List message posted by: Anthony Savarese <dsavarese0812(at)bellsouth.net>

The only way I know is to spray the suspected area with propane or carb cleaner with the engine running. But carb cleaner is flammable. Best to troubleshoot this when the engine is cold. So if you use carb cleaner be very careful.  What you’re looking for is the engine RPM to increase if there is a leak wherever you spay.
Dennis

Sent from my iPhone

Quote:
On Jul 2, 2021, at 4:36 PM, 1906 <zmadwolf(at)gmail.com> wrote:

--> Yak-List message posted by: "1906" <zmadwolf(at)gmail.com>

One more thing - is there an easy way to determine which intake tube might be the culprit? Or might as well do the gaskets on all?




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=502690#502690











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GeorgeCoy



Joined: 02 Dec 2010
Posts: 308

PostPosted: Fri Jul 02, 2021 5:48 pm    Post subject: Engine roughness at low power, 82% RPM? Reply with quote

You could use a propane torch but don’t lite the torch. Just use it like a sniffer and just wave the propane gas around the joints I will do the same thing with a lot less danger.
George Coy

Sent from my iPad

Quote:
On Jul 2, 2021, at 6:22 PM, Anthony Savarese <dsavarese0812(at)bellsouth.net> wrote:



The only way I know is to spray the suspected area with propane or carb cleaner with the engine running. But carb cleaner is flammable. Best to troubleshoot this when the engine is cold. So if you use carb cleaner be very careful. What you’re looking for is the engine RPM to increase if there is a leak wherever you spay.
Dennis

Sent from my iPhone

> On Jul 2, 2021, at 4:36 PM, 1906 <zmadwolf(at)gmail.com> wrote:
>
> 
>
> One more thing - is there an easy way to determine which intake tube might be the culprit? Or might as well do the gaskets on all?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=502690#502690
>
>
>
>
>
>
>
>
>







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glipaz



Joined: 11 Jan 2011
Posts: 107

PostPosted: Tue Jul 20, 2021 7:36 pm    Post subject: Re: Engine roughness at low power, 82% RPM? Reply with quote

Did you figure out what was causing your engine roughness?

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1906



Joined: 30 Nov 2018
Posts: 58

PostPosted: Mon Jul 26, 2021 9:22 am    Post subject: Re: Engine roughness at low power, 82% RPM? Reply with quote

Not yet. I am hoping to replace the intake gaskets/seals within the next 10 days.

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stephen.hayne



Joined: 01 Nov 2013
Posts: 59
Location: United States

PostPosted: Wed Aug 04, 2021 12:33 pm    Post subject: Re: Engine roughness at low power, 82% RPM? Reply with quote

GeorgeCoy wrote:
You could use a propane torch but don’t lite the torch. Just use it like a sniffer and just wave the propane gas around the joints I will do the same thing with a lot less danger.

This is beyond cool, but with the cowling off and engine running (prop blast) do you have to run the "plumbers" torch at full bore to get a rise?

Just wondering...


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