Today's Message Index:
----------------------
1. 01:20 PM - Acceptable CHT spread (Mike Whisky)
2. 01:34 PM - Re: Acceptable CHT spread (Kelly McMullen)
3. 01:36 PM - Re: Acceptable CHT spread (Jesse Saint)
4. 02:49 PM - Re: Acceptable CHT spread (Carl Froehlich)
5. 05:55 PM - Re: Acceptable CHT spread (Pascal)
6. 07:06 PM - Re: Acceptable CHT spread (Kelly McMullen)
Message 1
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| Subject: | Acceptable CHT spread |
Hi
I was wondering what CHT spread is acceptable in cruise.
I currently have a spread if 32 between my hottest and coolest cylinder in LOP
cruise.
I understand that a spread of 0 would be the ultimate goal but what spread do other
see in average.
Mike
--------
RV-10 builder (flying)
#511
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=430163#430163
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| Subject: | Re: Acceptable CHT spread |
Acceptable to whom? I would call your spread very acceptable if it is
hottest to coolest. If it were plus or minus 30 some degrees I might try to
get it a bit closer, but many certified planes are no better than that.
If you can get the EGT's to peak within 0.5gph or less, then CHT
differences are going to mostly depend on baffling caused airflow
differences. They can be fine tuned with the dams in front of #1 and #2
cylinders.
On Sun, Sep 7, 2014 at 1:20 PM, Mike Whisky <rv-10@wellenzohn.net> wrote:
>
> Hi
> I was wondering what CHT spread is acceptable in cruise.
> I currently have a spread if 32 between my hottest and coolest cylinder in
> LOP cruise.
> I understand that a spread of 0 would be the ultimate goal but what spread
> do other see in average.
>
> Mike
>
> --------
> RV-10 builder (flying)
> #511
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=430163#430163
>
>
Message 3
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| Subject: | Re: Acceptable CHT spread |
The most important thing is that all CHT's be within acceptable limits. After that,
the lower the spread the better. In my experience 32 degrees is quite good.
I wouldn't worry about getting them closer than that. If you have one or two
that are significantly different (ie, 5 are within 5 degrees and one is 30 degrees
out), then you could do a little something, but if all are in the mid 300's,
then I'd leave it alone.
Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse@saintaviation.com
Sent from my iPad
> On Sep 7, 2014, at 4:20 PM, "Mike Whisky" <rv-10@wellenzohn.net> wrote:
>
>
> Hi
> I was wondering what CHT spread is acceptable in cruise.
> I currently have a spread if 32 between my hottest and coolest cylinder in LOP
cruise.
> I understand that a spread of 0 would be the ultimate goal but what spread do
other see in average.
>
> Mike
>
> --------
> RV-10 builder (flying)
> #511
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=430163#430163
>
>
>
>
>
>
>
>
>
>
Message 4
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| Subject: | Acceptable CHT spread |
Agree with all the comments.
Now for me, after injector balancing I have EGTs all peak within 0.2 GPH but
#3 CHT is always the hottest by 30 degrees on climb out, 25 degrees in LOP
cruise (#3 hottest, #4 coolest in both cases, the rest of the cylinders
within a few degrees of #4 CHT). As #3 is in the middle, do I trim the
cylinder inter baffles that came with the engine to cool off #3 or what?
I already looked for casting flanges and such to clear between the cooling
fins on #3 - no joy.
Carl
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jesse Saint
Sent: Sunday, September 07, 2014 4:36 PM
Subject: Re: RV10-List: Acceptable CHT spread
The most important thing is that all CHT's be within acceptable limits.
After that, the lower the spread the better. In my experience 32 degrees is
quite good. I wouldn't worry about getting them closer than that. If you
have one or two that are significantly different (ie, 5 are within 5 degrees
and one is 30 degrees out), then you could do a little something, but if all
are in the mid 300's, then I'd leave it alone.
Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse@saintaviation.com
Sent from my iPad
> On Sep 7, 2014, at 4:20 PM, "Mike Whisky" <rv-10@wellenzohn.net> wrote:
>
>
> Hi
> I was wondering what CHT spread is acceptable in cruise.
> I currently have a spread if 32 between my hottest and coolest cylinder in
LOP cruise.
> I understand that a spread of 0 would be the ultimate goal but what spread
do other see in average.
>
> Mike
>
> --------
> RV-10 builder (flying)
> #511
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=430163#430163
>
>
>
>
>
>
>
>
>
>
Message 5
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| Subject: | Re: Acceptable CHT spread |
#3 for me as well, except my #3 is by far the coolest by 30F from the others
on climb and within 5 degrees of #4 in cruise but still 30-40F off from #6
my hottest.
-----Original Message-----
From: Carl Froehlich
Sent: Sunday, September 07, 2014 2:49 PM
Subject: RE: RV10-List: Acceptable CHT spread
<carl.froehlich@verizon.net>
Agree with all the comments.
Now for me, after injector balancing I have EGTs all peak within 0.2 GPH but
#3 CHT is always the hottest by 30 degrees on climb out, 25 degrees in LOP
cruise (#3 hottest, #4 coolest in both cases, the rest of the cylinders
within a few degrees of #4 CHT). As #3 is in the middle, do I trim the
cylinder inter baffles that came with the engine to cool off #3 or what?
I already looked for casting flanges and such to clear between the cooling
fins on #3 - no joy.
Carl
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jesse Saint
Sent: Sunday, September 07, 2014 4:36 PM
Subject: Re: RV10-List: Acceptable CHT spread
The most important thing is that all CHT's be within acceptable limits.
After that, the lower the spread the better. In my experience 32 degrees is
quite good. I wouldn't worry about getting them closer than that. If you
have one or two that are significantly different (ie, 5 are within 5 degrees
and one is 30 degrees out), then you could do a little something, but if all
are in the mid 300's, then I'd leave it alone.
Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse@saintaviation.com
Sent from my iPad
> On Sep 7, 2014, at 4:20 PM, "Mike Whisky" <rv-10@wellenzohn.net> wrote:
>
>
> Hi
> I was wondering what CHT spread is acceptable in cruise.
> I currently have a spread if 32 between my hottest and coolest cylinder in
LOP cruise.
> I understand that a spread of 0 would be the ultimate goal but what spread
do other see in average.
>
> Mike
>
> --------
> RV-10 builder (flying)
> #511
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=430163#430163
>
>
Message 6
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| Subject: | Re: Acceptable CHT spread |
Push the normalize button on the engine analyzer, if it has that feature,
so they all appear to be same temp, and ignore the difference. There is no
value in attempting to get it more balanced.
On Sun, Sep 7, 2014 at 2:49 PM, Carl Froehlich <carl.froehlich@verizon.net>
wrote:
> carl.froehlich@verizon.net>
>
> Agree with all the comments.
>
> Now for me, after injector balancing I have EGTs all peak within 0.2 GPH
> but
> #3 CHT is always the hottest by 30 degrees on climb out, 25 degrees in LOP
> cruise (#3 hottest, #4 coolest in both cases, the rest of the cylinders
> within a few degrees of #4 CHT). As #3 is in the middle, do I trim the
> cylinder inter baffles that came with the engine to cool off #3 or what?
>
> I already looked for casting flanges and such to clear between the cooling
> fins on #3 - no joy.
>
> Carl
>
> -----Original Message-----
> From: owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jesse Saint
> Sent: Sunday, September 07, 2014 4:36 PM
> To: rv10-list@matronics.com
> Subject: Re: RV10-List: Acceptable CHT spread
>
>
> The most important thing is that all CHT's be within acceptable limits.
> After that, the lower the spread the better. In my experience 32 degrees is
> quite good. I wouldn't worry about getting them closer than that. If you
> have one or two that are significantly different (ie, 5 are within 5
> degrees
> and one is 30 degrees out), then you could do a little something, but if
> all
> are in the mid 300's, then I'd leave it alone.
>
> Jesse Saint
> Saint Aviation, Inc.
> 352-427-0285
> jesse@saintaviation.com
>
> Sent from my iPad
>
> > On Sep 7, 2014, at 4:20 PM, "Mike Whisky" <rv-10@wellenzohn.net> wrote:
> >
> >
> > Hi
> > I was wondering what CHT spread is acceptable in cruise.
> > I currently have a spread if 32 between my hottest and coolest cylinder
> in
> LOP cruise.
> > I understand that a spread of 0 would be the ultimate goal but what
> spread
> do other see in average.
> >
> > Mike
> >
> > --------
> > RV-10 builder (flying)
> > #511
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=430163#430163
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
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