KR> Vacuum gauge

[John Martindale]

Snip from Mike...I've currently got a vacuum gauge and just want to
fill up the hole with something that provides more useful information.  A
vacuum gauge truly is
uselesssnip.

Why not just reverse the numbers in the vacuum gauge. If you are not going
to turbo-charge then the information portrayed is no different it's just the
face of the dial. 

Zero vacuum is atmospheric pressure circa 29" MP.  Idle vacuum is around 12"
MP.


John Martindale
29 Jane Circuit
Toormina NSW 2452
Australia

ph:61 2 6658 4767
m:0403 432179
email:john_martindale at bigpond.com
web site: 



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KR>Vacuum gauge vs manifold pressure gauge

[Ray Fuenzalida]

Please send the Power Point template for the flanges.  I may not use them, but 
I would like to see them.  Thanks.
Ray

"Serge F. Vidal"  wrote:
On ZS-WEC, my KR2, I converted all the automotive size instruments into
aircraft size (2.25 inches) instruments.

All I had to do was to make square flanges of the correct size out of
aluminium 2.8mm sheets (I dreamt of a thicker, plastic sheet, without
finding one), then cut out a hole in the middle at the correct automotive
hole size, slip the instrument in, and voila!
To secure the instrument to the flange, I epoxied each instrument to its new
flange, but quite frankly, the C-clamp would have worked too.

I have PowerPoint templates for these flanges, if anybody wants them. Just
print them on paper (ideally a sticker label), then cut the instrument holes
with your favorite hole saw or fly cutter, then drill the mounting holes,
then cut with a hacksaw.


Serge Vidal
KR2 ZS-WEC
Tunis, Tunisia

Ron Freiberger wrote:
[If it's AIRCRAFT, it's more expensive. And 2.25 inch diameter, and nice
looking. If you go to PepBoys, and buy one for your CAR, it'll be cheaper.]


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KR>Vacuum gauge vs manifold pressure gauge

[intrepid...@juno.com]

> "Serge F. Vidal"  writes:
> On ZS-WEC, my KR2, I converted all the automotive
> size instruments into aircraft size (2.25 inches) instruments.
> 
> All I had to do was to make square flanges of the correct
> size out of aluminium 2.8mm sheets (I dreamt of a thicker,
> plastic sheet, without finding one), then cut out a hole in
> the middle at the correct automotive hole size, slip the
> instrument in, and voila!

  I make the same kind of flanges from ~0.090" clear acrylic
  plastic sheet --- the same stock from Home Depot that I use
  for making windows, landing light covers, etc.

  For the miniature automotive gauges ( ~1-5/8" diameter ), I 
  make a "size proportionate" flange and 4-40 machine screws
  rather than up-size the gauge into a 2.25" Aircraft Hole with
  6-32 screws.  These are great space-saver gauges in a KR-1
  sized panel.

  For some I've even epoxied (or Crazy Glue, cyanoacrylate ?)
  rivnuts into the corner holes for ease of installation.  Counter-
  boring both sides of the flange and *pulling* the rivnut is a bit
  more problematic and sometimes breaks the corner off.

  a r t

  Art Cacella   1970 American AA-1  N6155L  "Dinkie"
  1972 KR-1 Plans, still not started 
  ( but four metal homebuilts underway )
  Winston-Salem, NC


The best thing to hit the Internet in years - Juno SpeedBand!
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KR>Vacuum gauge vs manifold pressure gauge

[Ross Youngblood]

I'm thinking that vacuum gauges are calibrated in inches of mercury,
and pressure gauges are in PSI, which are two different things.

But the principal is similar I think.

On Mon, 9 Feb 2004 19:53:10 +1100, Martindale Family  
wrote:

> OK folks this might be the dummest question but...
>
> Is a vacuum gauge going from 30" of vacuum down to 0" the same as a 
> manifold pressure gauge going from 0" of pressure up to 30". If so, and 
> it's just a dial face change, why are the latter so much more expensive. 
> See, for example, in the Aircraft Spruce catalog (mine is old at 
> 1998-1999):
>
> Mitchell vacuum gauge PN 10-25125 for $35-50 and manifold gauge PN 
> 10-25145 for $71-50.
>
> Why couldn't I just remove the dial face and mirror image it? Does 
> anyone know of a supplier of 2 1/4" manifold gauges that are cheaper. 
> Egauges have an ISSPRO but it's calibrated in psi and I don't like its 
> look. VDO don't seem to make a MP but do have a vacuum and this might be 
> what I get since it matches my other gauges.
>
> Awaiting the dunce's hat in the corner!!
>
> John
>
> The Martindale Family
> 29 Jane Circuit
> TOORMINA NSW 2452
> AUSTRALIA
>
> phone: 61 2 66584767
> email: johnj...@chc.net.au___
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html



-- 
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

KR>Vacuum gauge vs manifold pressure gauge

[Martindale Family]

Agreed Ross. One standard atmosphere equals 14.73psi or 29.92 " Hg or
1013.2mB (HPa) or 101.56kPa and gauges can be calibrated to any of
these.aircraft generally use "Hg but try to explain the difference to
some ignorant young salesman when you're chasing such a gauge. I encounter
this problem with electronic salesmen, AN bolt size versus wire gauge etc
etc, weber jets, ...I could go on and on it's very exasperating knowing
everything about everything ...sic...:-)  Ever tried to explain to a pilot
why an aircraft cannot stall at 0G!!!

John

The Martindale Family
29 Jane Circuit
TOORMINA NSW 2452
AUSTRALIA

phone: 61 2 66584767
email: johnj...@chc.net.au
- Original Message -
From: "Ross Youngblood" <ross...@operamail.com>
To: "KRnet" <kr...@mylist.net>
Sent: Tuesday, February 10, 2004 8:04 PM
Subject: Re: KR>Vacuum gauge vs manifold pressure gauge


> I'm thinking that vacuum gauges are calibrated in inches of mercury,
> and pressure gauges are in PSI, which are two different things.
>
> But the principal is similar I think.
>
> On Mon, 9 Feb 2004 19:53:10 +1100, Martindale Family <johnj...@chc.net.au>
> wrote:
>
> > OK folks this might be the dummest question but...
> >
> > Is a vacuum gauge going from 30" of vacuum down to 0" the same as a
> > manifold pressure gauge going from 0" of pressure up to 30". If so, and
> > it's just a dial face change, why are the latter so much more expensive.
> > See, for example, in the Aircraft Spruce catalog (mine is old at
> > 1998-1999):
> >
> > Mitchell vacuum gauge PN 10-25125 for $35-50 and manifold gauge PN
> > 10-25145 for $71-50.
> >
> > Why couldn't I just remove the dial face and mirror image it? Does
> > anyone know of a supplier of 2 1/4" manifold gauges that are cheaper.
> > Egauges have an ISSPRO but it's calibrated in psi and I don't like its
> > look. VDO don't seem to make a MP but do have a vacuum and this might be
> > what I get since it matches my other gauges.
> >
> > Awaiting the dunce's hat in the corner!!
> >
> > John
> >
> > The Martindale Family
> > 29 Jane Circuit
> > TOORMINA NSW 2452
> > AUSTRALIA
> >
> > phone: 61 2 66584767
> > email: johnj...@chc.net.au___
> > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> > please see other KRnet info at http://www.krnet.org/info.html
>
>
>
> --
> Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
>
> ___
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
>

KR>Vacuum gauge vs manifold pressure gauge / cyanoacrylate glue

[Serge F. Vidal]

I was once told that cyanoacrylate glues (common name "Superglue") is not
suitable for vehicle applications, because it does not withstand vibrations.

Serge Vidal
KR2 ZS-WEC
Tunis, Tunisia


  Art Cacella wrote:

[ For some I've even epoxied (or Crazy Glue, cyanoacrylate ?)
  rivnuts into the corner holes for ease of installation.  Counter-
  boring both sides of the flange and *pulling* the rivnut is a bit
  more problematic and sometimes breaks the corner off.]

KR>Vacuum gauge vs manifold pressure gauge

[Martindale Family]

OK folks this might be the dummest question but...

Is a vacuum gauge going from 30" of vacuum down to 0" the same as a manifold 
pressure gauge going from 0" of pressure up to 30". If so, and it's just a dial 
face change, why are the latter so much more expensive. See, for example, in 
the Aircraft Spruce catalog (mine is old at 1998-1999):

Mitchell vacuum gauge PN 10-25125 for $35-50 and manifold gauge PN 10-25145 for 
$71-50.

Why couldn't I just remove the dial face and mirror image it? Does anyone know 
of a supplier of 2 1/4" manifold gauges that are cheaper. Egauges have an 
ISSPRO but it's calibrated in psi and I don't like its look. VDO don't seem to 
make a MP but do have a vacuum and this might be what I get since it matches my 
other gauges.

Awaiting the dunce's hat in the corner!!

John

The Martindale Family
29 Jane Circuit
TOORMINA NSW 2452
AUSTRALIA

phone: 61 2 66584767
email: johnj...@chc.net.au

KR>Vacuum gauge vs manifold pressure gauge

[Dan Heath]

You may be right, but, assuming you need a manifold pressure gauge, which
will take more time? Earning the extra $20, or accomplishing this task?  And
 then, we still don't know if we have the same thing.

See N64KR at http://KR-Builder.org - Then click on the pics

Daniel R. Heath - Columbia, SC

da...@kr-builder.org

See you in Mt. Vernon - 2004 - KR Gathering

See our EAA Chapter 242 at http://EAA242.org

KR>Vacuum gauge vs manifold pressure gauge

[Orma Robbins]

 2 1/4" manifold gauges that are cheaper
Westach used to sell them through Wick or Spruce.  I have one but it was
purchased 20 years ago.
Orma L. Robbins
o...@aviation-mechanics.com

KR>Vacuum gauge vs manifold pressure gauge

[Mark Jones]

>OK folks this might be the dummest question but...

>Is a vacuum gauge going from 30" of vacuum down to 0" the same as a 
>manifold pressure gauge going from 0" of pressure up to 30". If so, and 
>it's just a dial face change, why are the latter so much more expensive. 
>See, for example, in the Aircraft Spruce catalog (mine is old at 
>1998-1999):

No, the two gauges are not the same. A vacuum gauge is measured in inches of
mercury and uses an internal bourdon tube which flexes and contracts with
pressure changes and is what a standard pressure gauge uses to measure
pressure. A manifold pressure gauge measures inches of water which is a very
low pressure and incorporates a diaphragm to make the measurement and is
calibrated accordingly.  Now, if you really want to save money, my company
sells every type of pressure gauge you can think of and we have 63mm (2
1/2")  0-30" hg gauges for  $25 each. These are all stainless steel case,
panel mount held in place by a U-clamp. 

Mark Jones (N886MJ
Wales, WI

KR>Vacuum gauge vs manifold pressure gauge

[Ron Freiberger]

Manifold "pressure" is conventionally measured is Inches of mercury, 0 to
30.  If it's AIRCRAFT, it's more expensive. And 2.25 inch diameter, and nice
looking.  If you go to PepBoys, and buy one for your CAR, it'll be cheaper.

Ron Freiberger
mailto: rfreiber...@swfla.rr.com

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of
Mark Jones
Sent: Monday, February 09, 2004 10:10 AM
To: KR Net
Subject: Re: KR>Vacuum gauge vs manifold pressure gauge

>OK folks this might be the dummest question but...

>Is a vacuum gauge going from 30" of vacuum down to 0" the same as a
>manifold pressure gauge going from 0" of pressure up to 30". If so, and
>it's just a dial face change, why are the latter so much more expensive.
>See, for example, in the Aircraft Spruce catalog (mine is old at
>1998-1999):

No, the two gauges are not the same. A vacuum gauge is measured in inches of
mercury and uses an internal bourdon tube which flexes and contracts with
pressure changes and is what a standard pressure gauge uses to measure
pressure. A manifold pressure gauge measures inches of water which is a very
low pressure and incorporates a diaphragm to make the measurement and is
calibrated accordingly.  Now, if you really want to save money, my company
sells every type of pressure gauge you can think of and we have 63mm (2
1/2")  0-30" hg gauges for  $25 each. These are all stainless steel case,
panel mount held in place by a U-clamp.

Mark Jones (N886MJ
Wales, WI

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KR>Vacuum gauge vs manifold pressure gauge

[Mark Jones]

Thanks Ron/Kenneth for the correction. Inches of mercury for manifold
pressure is correct. I was not thinking clearly. But that is not unusual.

Mark Jones
Mueller Sales Corporation
Ph: 262-781-5310
Fax:262-781-4130
E-mail: mjo...@muellersales.com
Web: www.muellersales.com


-Original Message-
From: Ron Freiberger [mailto:rfreiber...@swfla.rr.com] 
Sent: Monday, February 09, 2004 9:51 AM
To: KRnet
Subject: RE: KR>Vacuum gauge vs manifold pressure gauge

Manifold "pressure" is conventionally measured is Inches of mercury, 0 to
30.  If it's AIRCRAFT, it's more expensive. And 2.25 inch diameter, and nice
looking.  If you go to PepBoys, and buy one for your CAR, it'll be cheaper.

Ron Freiberger
mailto: rfreiber...@swfla.rr.com

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of
Mark Jones
Sent: Monday, February 09, 2004 10:10 AM
To: KR Net
Subject: Re: KR>Vacuum gauge vs manifold pressure gauge

>OK folks this might be the dummest question but...

>Is a vacuum gauge going from 30" of vacuum down to 0" the same as a
>manifold pressure gauge going from 0" of pressure up to 30". If so, and
>it's just a dial face change, why are the latter so much more expensive.
>See, for example, in the Aircraft Spruce catalog (mine is old at
>1998-1999):

No, the two gauges are not the same. A vacuum gauge is measured in inches of
mercury and uses an internal bourdon tube which flexes and contracts with
pressure changes and is what a standard pressure gauge uses to measure
pressure. A manifold pressure gauge measures inches of water which is a very
low pressure and incorporates a diaphragm to make the measurement and is
calibrated accordingly.  Now, if you really want to save money, my company
sells every type of pressure gauge you can think of and we have 63mm (2
1/2")  0-30" hg gauges for  $25 each. These are all stainless steel case,
panel mount held in place by a U-clamp.

Mark Jones (N886MJ
Wales, WI

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KR>Vacuum gauge vs manifold pressure gauge

[Mark Jones]

Here is a good article. 
http://www.rodmachado.com/Product/Books/Excerpts/c3-29.pdf


Mark Jones
Mueller Sales Corporation
Ph: 262-781-5310
Fax:262-781-4130
E-mail: mjo...@muellersales.com
Web: www.muellersales.com


-Original Message-
From: Mark Jones [mailto:mjo...@muellersales.com] 
Sent: Monday, February 09, 2004 10:08 AM
To: 'rfreiber...@swfla.rr.com'; 'KRnet'
Subject: RE: KR>Vacuum gauge vs manifold pressure gauge

Thanks Ron/Kenneth for the correction. Inches of mercury for manifold
pressure is correct. I was not thinking clearly. But that is not unusual.

Mark Jones
Mueller Sales Corporation
Ph: 262-781-5310
Fax:262-781-4130
E-mail: mjo...@muellersales.com
Web: www.muellersales.com


-Original Message-
From: Ron Freiberger [mailto:rfreiber...@swfla.rr.com] 
Sent: Monday, February 09, 2004 9:51 AM
To: KRnet
Subject: RE: KR>Vacuum gauge vs manifold pressure gauge

Manifold "pressure" is conventionally measured is Inches of mercury, 0 to
30.  If it's AIRCRAFT, it's more expensive. And 2.25 inch diameter, and nice
looking.  If you go to PepBoys, and buy one for your CAR, it'll be cheaper.

Ron Freiberger
mailto: rfreiber...@swfla.rr.com

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of
Mark Jones
Sent: Monday, February 09, 2004 10:10 AM
To: KR Net
Subject: Re: KR>Vacuum gauge vs manifold pressure gauge

>OK folks this might be the dummest question but...

>Is a vacuum gauge going from 30" of vacuum down to 0" the same as a
>manifold pressure gauge going from 0" of pressure up to 30". If so, and
>it's just a dial face change, why are the latter so much more expensive.
>See, for example, in the Aircraft Spruce catalog (mine is old at
>1998-1999):

No, the two gauges are not the same. A vacuum gauge is measured in inches of
mercury and uses an internal bourdon tube which flexes and contracts with
pressure changes and is what a standard pressure gauge uses to measure
pressure. A manifold pressure gauge measures inches of water which is a very
low pressure and incorporates a diaphragm to make the measurement and is
calibrated accordingly.  Now, if you really want to save money, my company
sells every type of pressure gauge you can think of and we have 63mm (2
1/2")  0-30" hg gauges for  $25 each. These are all stainless steel case,
panel mount held in place by a U-clamp.

Mark Jones (N886MJ
Wales, WI

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KR>Vacuum gauge vs manifold pressure gauge

[Serge F. Vidal]

On ZS-WEC, my KR2, I converted all the automotive size instruments into
aircraft size (2.25 inches) instruments.

All I had to do was to make square flanges of the correct size out of
aluminium 2.8mm sheets (I dreamt of a thicker, plastic sheet, without
finding one), then cut out a hole in the middle at the correct automotive
hole size, slip the instrument in, and voila!
To secure the instrument to the flange, I epoxied each instrument to its new
flange, but quite frankly, the C-clamp would have worked too.

I have PowerPoint templates for these flanges, if anybody wants them. Just
print them on paper (ideally a sticker label), then cut the instrument holes
with your favorite hole saw or fly cutter, then drill the mounting holes,
then cut with a hacksaw.


Serge Vidal
KR2 ZS-WEC
Tunis, Tunisia

Ron Freiberger wrote:
[If it's AIRCRAFT, it's more expensive. And 2.25 inch diameter, and nice
looking.  If you go to PepBoys, and buy one for your CAR, it'll be cheaper.]