[Zmagnette] Your humble servant...

Fletcher Millmore gofanu at cust.usachoice.net
Mon Feb 24 23:00:04 MST 2014 

Allen-
No different to why your turn indicators slow down when the car is 
idling with lots of whizzy eaters on.

It can be informative to measure temperature at all connections and 
breakers with an IR heat gun. Best with cover plates off the boxes. It 
is common to have significant losses at main connections especially, as 
in the service box; more so if they have not been retightened after a 
period of use. Service cables are generally aluminum, and the 
connections get loose over time, getting hot and oxidising, which makes 
it worse. This is what OxGard was invented for, but they still need 
periodic retightening. The heat can eventually carbonise the plastic the 
parts are made of, which can lead to a fire, or at least constantly 
tripping breakers and the need for new service boxes. Correctly sized 
and tight connections should be very near ambient, and everything with 
equal loads should be about equal temp.

Also interesting to use an AC voltmeter at every possible point, as 
loads come and go. You can find notable differences which can lead to 
particular bad connections. Not to mention variance from the power 
company. My "120/240" power typically is 122/244, but often ranges 
125/250 to 115/230.

I once investigated an industrial installation, recently done by a 
"Master Electrician" - in a 440V system, I found around 404 delivered V, 
which pretty well explained poor equipment performance! Finding the 
really bad connections was easy with the IR gun.

FRM

On 2/24/2014 11:38 PM, Allen Bachelder wrote:
> Wow, Mike,
> THAT is what I call a creative answer.  My first instinct was to try 
> to relate the functions of the compressor and vacuum cleaner.  But as 
> others have suggested, the "problem" is no doubt electrical.  For 
> those concerned, I have 200 amp service to my shop with #12 running to 
> all 110 volt circuits and #10 running to the three 220 volt circuits. 
>  So I doubt if there is any fire hazard. But with two 220-volt heaters 
> already running on separate 30-amp circuits, when the compressor kicks 
> on (on a third 30-amp circuit), there is indeed a barely-perceptible 
> drop in vacuum-cleaner motor speed.  Without the heaters running, no 
> change is perceptible.
>
> That's all for today's "shop quiz".  Mark B.: thanks for your 
> occasional added remarks.  We appreciate them. ' Glad you're listening!
>
> Cheers,
> Allen
> */****************************************************************/*
> */Allen & Florrie Bachelder   =iii=<
> Spring Creek Home for Wayward MGs/*
> */'57 ZB, '65 B, '69 C/GT, '73 B/GT/*
> */North Street, MI 48049, USA/*
> */http://www.mgexperience.net/member/bachldrs/*
> */****************************************************************/*
>
> On Feb 24, 2014, at 7:21 PM, Mike wrote:
>
>> Are the vacuum and compressor sucking up air from the same enclosed 
>> space that is your warm & snug shop? Do your ears pop if they both 
>> start at the same time? I have a hard time believing that the 
>> compressor lowers the shop's air pressure enough to make the vacuum 
>> labor, but that's the only other idea I have besides John's 
>> electrical load explanation.
>>
>> I suppose you could bring a barometer into the shop and check the air 
>> pressure that way.
>>
>> Mike
>>
>> ------------------------------------------------------------------------
>> *From:* John Park <jpark at bmts.com <mailto:jpark at bmts.com>>
>> *To:* 'List for the Z Magnette Group - North America' 
>> <zmagnette at autox.team.net <mailto:zmagnette at autox.team.net>>
>> *Sent:* Monday, February 24, 2014 3:51 PM
>> *Subject:* Re: [Zmagnette] Your humble servant...
>>
>> Your compressor draws too much current and your wiring won't support 
>> it. You could be in for some overheated wire which could lead to a 
>> fire. Best to get 200 amp service or at a minimum a separate circuit 
>> for the compressor.
>> *From:*zmagnette-bounces at autox.team.net 
>> <mailto:zmagnette-bounces at autox.team.net> 
>> [mailto:zmagnette-bounces at autox.team.net] *On Behalf Of *Allen Bachelder
>> *Sent:* Monday, February 24, 2014 8:53 AM
>> *To:* List for the Z Magnette Group - North America
>> *Subject:* Re: [Zmagnette] Your humble servant...
>> Update: ' got both sides finished correctly yesterday.
>> Here's a little shop quiz (as opposed to pop quiz) item for you.  I 
>> figured it out - let's see if you come up with the same conclusion. 
>>  I was bead-blasting a hub yesterday. With outside temp moderating to 
>> around 30º F ( -1º C), my three little shop heaters make it very 
>> comfortable to work out there. I'm lovin' it! So, I'm bead-blasting 
>> away and I note that whenever the compressor cycles off, the vacuum 
>> cleaner on my cabinet speeds up slightly. Why?
>> Cheers,
>> Allen
>> *********************************************
>> Allen & Florrie Bachelder
>> North Street, MI
>> bachldrs at comcast.net <mailto:bachldrs at comcast.net>
>> *********************************************
>> On Feb 19, 2014, at 10:44 PM, Allen Bachelder wrote:
>>
>>
>>     reassembling his MGB...
>>     "Nonsense," said Allen, "first the distance piece, and THEN the
>>     inner bearing and seal."
>>     ' Guess that's what those spare FWB seals are for...
>>     */****************************************************************/*
>>     */Allen & Florrie Bachelder       =iii=<
>>     Spring Creek Home for Wayward MGs/*
>>     */'57 ZB, '65 B, '69 C/GT, '73 B/GT/*
>>     */North Street, MI 48049, USA/*
>>     */http://www.mgexperience.net/member/bachldrs/*
>>     ****************************************************************
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