Hello all, may be some one could help me out. I purchased a 1967 C-182 K
this summer with a Continental 470. When I pull out the carb the RPMs drop
considerably(200+rpm). I believe that it is creating a rich mixture as on a
run up I can get the rpms to come back up by leaning. I guess I'm just not
used to this kind of massive change and I'm wondering if its normal and if
there is anything I can do about it.

On Sun, 21 Nov 2004 20:10:30 -0500, "R.T." <brt5ATexeculink.com>
wrote:

>Hello all, may be some one could help me out. I purchased a 1967 C-182 K
>this summer with a Continental 470. When I pull out the carb the RPMs drop
>considerably(200+rpm). I believe that it is creating a rich mixture as on a
>run up I can get the rpms to come back up by leaning. I guess I'm just not
>used to this kind of massive change and I'm wondering if its normal and if
>there is anything I can do about it.
>


Sounds like your carb heat works really well.

Bring the engine back to full idle and apply the carb heat. If it
still runs I wouldn't worry about it. Doing this check will make sure
the engine won't quit on short final.

HTH.
z

Our club has a '67 182. Similar behavior. I'll have to try pulling all the
way at idle. I've never had it kill the engine on final, though.
I've gotten to the point I only pull the carb heat out about half way.


"zatatime" > wrote in message
...
> On Sun, 21 Nov 2004 20:10:30 -0500, "R.T." <brt5ATexeculink.com>
> wrote:
>
> >Hello all, may be some one could help me out. I purchased a 1967 C-182 K
> >this summer with a Continental 470. When I pull out the carb the RPMs
drop
> >considerably(200+rpm). I believe that it is creating a rich mixture as on
a
> >run up I can get the rpms to come back up by leaning. I guess I'm just
not
> >used to this kind of massive change and I'm wondering if its normal and
if
> >there is anything I can do about it.
> >
>
>
> Sounds like your carb heat works really well.
>
> Bring the engine back to full idle and apply the carb heat. If it
> still runs I wouldn't worry about it. Doing this check will make sure
> the engine won't quit on short final.
>
> HTH.
> z

"R.T." <brt5ATexeculink.com> wrote in message
...
> Hello all, may be some one could help me out. I purchased a 1967 C-182 K
> this summer with a Continental 470. When I pull out the carb the RPMs drop
> considerably(200+rpm). I believe that it is creating a rich mixture as on
a
> run up I can get the rpms to come back up by leaning. I guess I'm just not
> used to this kind of massive change and I'm wondering if its normal and if
> there is anything I can do about it.
>

Working just fine. Doubt that happens when flying. You must mean on the
ground during runup. Unless you have a carb temp gauge the POH says full
carb heat when below the green (approach and landing). I have a carb temp
gauge and it sometimes goes into the yellow mid summer here in coastal
california when OAT is 70F+. In a 182 carb heat is your friend.

Howard C182P
>


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It does happen in flight, I have always been taught to do a carb heat check
on down wind and you can feel the engine drop in power (CS prop keeps the
rpms up) . I don't have a carb temp guage but right now i wish i did have.
RT
"Howard Nelson" > wrote in message
om...
>
> "R.T." <brt5ATexeculink.com> wrote in message
> ...
>> Hello all, may be some one could help me out. I purchased a 1967 C-182 K
>> this summer with a Continental 470. When I pull out the carb the RPMs
>> drop
>> considerably(200+rpm). I believe that it is creating a rich mixture as on
> a
>> run up I can get the rpms to come back up by leaning. I guess I'm just
>> not
>> used to this kind of massive change and I'm wondering if its normal and
>> if
>> there is anything I can do about it.
>>
>
> Working just fine. Doubt that happens when flying. You must mean on the
> ground during runup. Unless you have a carb temp gauge the POH says full
> carb heat when below the green (approach and landing). I have a carb temp
> gauge and it sometimes goes into the yellow mid summer here in coastal
> california when OAT is 70F+. In a 182 carb heat is your friend.
>
> Howard C182P
>>
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.796 / Virus Database: 540 - Release Date: 11/13/2004
>
>

I'll bet you are running unusually rich for whatever reason - even
with carb heat off.

To start off with though, the mixture distribution in carburated
O-470s is poor.

) wrote in message >...
> I'll bet you are running unusually rich for whatever reason - even
> with carb heat off.
>
> To start off with though, the mixture distribution in carburated
> O-470s is poor.


Whenever you pull carb heat on, the mixture gets really rich. You
can get most of the power back by re-leaning.

The distribution in O-470s can be fixed by running the carb heat such
that the carb air temperature is 10C. They will smooth out and even
lean of peak operations can be done. Courtesy of the excellent Advanced
Pilot Seminar course.

You DO have a carb temp gauge on this ice maker don't you?

Bill Hale

No I don't have a Carb Temp gauge..............from that comment I am
assuming you think that it would be a wise desision?
On that note any recomendations as to what to get and how much to expect to
pay?

"Bill Hale" > wrote in message
om...
> ) wrote in message
> >...
>> I'll bet you are running unusually rich for whatever reason - even
>> with carb heat off.
>>
>> To start off with though, the mixture distribution in carburated
>> O-470s is poor.
>
>
> Whenever you pull carb heat on, the mixture gets really rich. You
> can get most of the power back by re-leaning.
>
> The distribution in O-470s can be fixed by running the carb heat such
> that the carb air temperature is 10C. They will smooth out and even
> lean of peak operations can be done. Courtesy of the excellent Advanced
> Pilot Seminar course.
>
> You DO have a carb temp gauge on this ice maker don't you?
>
> Bill Hale

R.T. wrote:

> Hello all, may be some one could help me out. I purchased a 1967 C-182 K
> this summer with a Continental 470.

I also have the 67 182.


When I pull out the carb the RPMs drop
> considerably(200+rpm).

Yep.


I believe that it is creating a rich mixture as on a
> run up I can get the rpms to come back up by leaning.

Pulling carb heat on any plane always makes the mixture rich.


I guess I'm just not
> used to this kind of massive change and I'm wondering if its normal and if
> there is anything I can do about it.

It's normal. I don't use carb heat because it's not needed where I
live. Don't use carb heat in the pattern just because the checklist
calls for it. Use it when you need it.

You can get an EI digital stand alone unit for a couple hundred. I have
mine as part of my engine analyzer.



R.T. wrote:

> No I don't have a Carb Temp gauge..............from that comment I am
> assuming you think that it would be a wise desision?
> On that note any recomendations as to what to get and how much to expect to
> pay?
>
> "Bill Hale" > wrote in message
> om...
>
) wrote in message
>...
>>
>>>I'll bet you are running unusually rich for whatever reason - even
>>>with carb heat off.
>>>
>>>To start off with though, the mixture distribution in carburated
>>>O-470s is poor.
>>
>>
>>Whenever you pull carb heat on, the mixture gets really rich. You
>>can get most of the power back by re-leaning.
>>
>>The distribution in O-470s can be fixed by running the carb heat such
>>that the carb air temperature is 10C. They will smooth out and even
>>lean of peak operations can be done. Courtesy of the excellent Advanced
>>Pilot Seminar course.
>>
>>You DO have a carb temp gauge on this ice maker don't you?
>>
>>Bill Hale
>
>
>

Newps > wrote in message >...
> R.T. wrote:
>
> > Hello all, may be some one could help me out. I purchased a 1967 C-182 K
> > this summer with a Continental 470.
>
> I also have the 67 182.
>
>
> When I pull out the carb the RPMs drop
> > considerably(200+rpm).
>
> Yep.
>
>
> I believe that it is creating a rich mixture as on a
> > run up I can get the rpms to come back up by leaning.
>
> Pulling carb heat on any plane always makes the mixture rich.
>
>
> I guess I'm just not
> > used to this kind of massive change and I'm wondering if its normal and if
> > there is anything I can do about it.
>
> It's normal. I don't use carb heat because it's not needed where I
> live. Don't use carb heat in the pattern just because the checklist
> calls for it. Use it when you need it.

The O-470s in any Cessna I've flown had strong carb heat,
probably too strong, and we used to use partial carb heat unless the
icing risk was high. A carb icing chart is helpful so that you can use
whatever heat necessary without creating carb ice farther up in the
intake manifold as partial heat can sometimes do.

Dan

> It's normal. I don't use carb heat because it's not needed where I
> live. Don't use carb heat in the pattern just because the checklist
> calls for it. Use it when you need it.

AOPA sez carb ice can be encountered at inlet air temps up to 104
degF. They also have a chart that they occasionally publish that
shows the tendency to generate carb ice as a function of inlet air
temp & relative humidity. This chart shows a real coffin corner at
high humidities around 50 deg F. Higher temps and there will be less
tendency of course, and at lower temps there isn't necessarily enough
moisture in the air to form ice.

That chart should be posted more widely. I can't find it just now,
but it was recently on their web site. It should be necessary
studying for us flying with carburetors.