REFLECTOR: Vacuum pump

[Mark Magee]

There is always the wet pumps, they seem to last quite a while. They do
require an air oil separator however.

Mark


On Wed, Apr 10, 2013 at 11:48 AM, Richard J. Gentil <
richard at naples-air-center.com> wrote:

> I went to dual battery, dual buss and no vacuum pump.
>
> No pump no worries.
>
> Richard
>
> Sent from my iPhone 5
>
> On Apr 10, 2013, at 12:38 PM, nmflyer1 at aol.com wrote:
>
> The guy that tried it said that the valve overlap in his engine (a V-6
> like mine) caused pulses in the vacuum supply (he tapped off the intake
> manifold, no pump).  Not sure of the details, but something about that
> pulsing allowed moisture into the system. Trashed all his instruments. That
> is what I was referring to. Again, a bit vacuum accumulator could dampen
> out some of those problems, but seems to me just going electric is much
> easier and more reliable. I have had several vacuum pumps fail of different
> aircraft. I have never had an electric gyro go bad.
> YMMV.
>
> Kurt
>
>
>  -----Original Message-----
> From: Clayton Chase <chasec at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Wed, Apr 10, 2013 9:47 am
> Subject: Re: REFLECTOR: Vacuum pump
>
>  How does the difference between a vacuum pump and a venturi affect
> moisture?   The air enters the system through the other end.   I can
> understand that inconsistent vacuum provided by a venturi could cause
> damage, but you could do workarounds that should help.  An electric vacuum
> boost pump that is on when the landing gear is down (and airspeed is low
> and the venturi is not providing good suction) and a good vacuum limiter
> should resolve most of the issues.
> On Apr 10, 2013 8:12 AM, <nmflyer1 at aol.com> wrote:
>
>> Yup, Had those in my 56 Chevy too. They would almost come to a stop when
>> you hammered the throttle.
>>
>> For me, I just went all electric. I didn't want to deal with the vacuum
>> issue and length of runs. So far, so good.
>>
>> Kurt
>>
>>
>>  -----Original Message-----
>> From: Robert Wood <slvegl99 at aol.com>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Sent: Wed, Apr 10, 2013 8:47 am
>> Subject: Re: REFLECTOR: Vacuum pump
>>
>>  Yeah, I was just reflecting on my '37 Ford wipers.
>>
>> Bob Wood
>>
>>  Sent from my iPad
>>
>> On Apr 10, 2013, at 10:44 AM, nmflyer1 at aol.com wrote:
>>
>>   That has been tried & failed. Between moisture and pulsing (unless you
>> have a Big vacuum tank with a dryer). Last guy that I know tried it had to
>> replace all his instruments.
>>
>> Kurt
>>
>>
>>  -----Original Message-----
>> From: Robert Wood <slvegl99 at aol.com>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Sent: Wed, Apr 10, 2013 8:40 am
>> Subject: Re: REFLECTOR: Vacuum pump
>>
>>  How about a line from the intake manifold?
>>
>>
>> Bob Wood
>>
>>  Sent from my iPad
>>
>> On Apr 10, 2013, at 10:33 AM, "Richard J. Gentil" <
>> richard at naples-air-center.com> wrote:
>>
>>   Lol!!!
>>
>>  That would just look so wrong in so many ways!
>>
>>  Richard
>>
>> Sent from my iPhone 5
>>
>> On Apr 10, 2013, at 10:10 AM, Mark Magee <edjonesbrady at gmail.com> wrote:
>>
>>   I just replaced mine and tried to figure a way to eliminate it...
>> Anyone using a venturi??? With our speed they should pull hard...
>> They would look a little 'retro' but would be easier than replacing these
>> disposable Rapcos.
>> Mark
>>
>>
>> On Wed, Apr 10, 2013 at 8:51 AM, Richard J. Gentil <
>> richard at naples-air-center.com> wrote:
>>
>>> Bob,
>>>
>>> Don't forget to blow out the vacuum line and clean/replace the air
>>> filter.
>>>
>>> Richard
>>>
>>> Sent from my iPhone 5
>>>
>>> On Apr 10, 2013, at 8:38 AM, Robert  Wood <slvegl99 at aol.com> wrote:
>>>
>>>  > Monday on a flight with my Velocity XL with a Lycoming IO 540 I
>>> experienced a vacuum pump failure. Any secrets in the procedures for
>>> removing and replacing it? Is the drive shaft to be lubricated when the
>>> replacement is installed?
>>> >
>>> > Bob Wood
>>> >
>>> > Sent from my iPad
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>>
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