Damn that blower gone again.

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Chris_C
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Re: Damn that blower gone again.

Post by Chris_C » 08 Jun 2013 08:16 am

Even through Pam is more efficient, you still would need to switch the fan with a 16A midget which will get super hot and need very similar thermal protection to that causing the issues here.

Plus, the ignition would cause all sorts if hassle to digital electrics being so close without a lot of noise suppression

Edit: on phone... Pwm and mosfet
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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Re: Damn that blower gone again.

Post by pettaw » 13 Jun 2013 09:39 am

This sounds very interesting. You've been doing great work Mac. I have a couple of thoughts too. All the 'bench' testing was done with the motor inside the housing, but out in the open air. The inlet to the air box and the outlet were both unrestricted.

When they're installed in the car, you've got the bonnet scoop as the inlet, and the heater matrix and all the vents as the outlet. They must be offering at least some resistance to airflow and I would therefore suspect that the airflow is substantially reduced from your test rig under 'ideal conditions' so-to-speak. Would these restrictions cause the motor to 'freewheel' somewhat and therefore lower the current draw or would it cause a 'blockage' and stall the motor, raising the current draw?

The other thought, is the cutout switches and their cutout temperature. How is the spec formed? Is it an external spec or internal spec. Also, is there a maximum current spec and is the switching current momentarily going over spec whilst the motor speeds up?

Andy

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Chris_C
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Re: Damn that blower gone again.

Post by Chris_C » 13 Jun 2013 04:51 pm

pettaw wrote:and the heater matrix and all the vents as the outlet. They must be offering at least some resistance to airflow and I would therefore suspect that the airflow is substantially reduced from your test rig under 'ideal conditions' so-to-speak. Would these restrictions cause the motor to 'freewheel' somewhat and therefore lower the current draw or would it cause a 'blockage' and stall the motor, raising the current draw?
Good thought and I'm in agreeance, as I said when I fitted the Locost rad fan it's full voltage RPM dropped significantly between me having in in the lounge and bolted up to the heater matrix.
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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Re: Damn that blower gone again.

Post by mac » 04 Jul 2013 05:43 pm

Afternoon girls,

Haven't forgotten the heater resistor project - attacking from a slightly different angle - decided to build a variable load device (Otter tell me they tend to specify the G6 as "operates after xx secs. @ yy amps) so I'm going to find out exactly how a new resistor pack performs.

I've acquired a rather Art Deco 0.3 variable resistor which should give me a good 20A at 13vdc. By the look of it I suspect it originally came out of a 1930s death ray but it should do what I need. I've built it into a test rig and we shall see!

Image

Does it work? - dunno - only just finished it - will find out tomorrow.

Before anybody asks "why the bulb" - belt and braces - the device is unknown so I've built in a safety in case of a dead short.

Mac.
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Re: Damn that blower gone again.

Post by macplaxton » 04 Jul 2013 05:49 pm

mac wrote:so I've built in a safety in case of a dead short.
Yer big blouse! :P
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Chris_C
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Re: Damn that blower gone again.

Post by Chris_C » 04 Jul 2013 06:09 pm

I wouldn't worry about damaging the VR... would make a fairly good 240W electric fire though I'd have thought :lol: :lol:
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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Re: Damn that blower gone again.

Post by V6 Man » 04 Jul 2013 09:44 pm

Personally I'd rebuild the '30's Death ray and forget about the resistors......
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Re: Damn that blower gone again.

Post by mac » 05 Jul 2013 08:55 pm

Just for you Roo - the death ray in action,

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Re: Damn that blower gone again.

Post by foggyjames » 13 Jul 2013 11:30 am

V3M's militant wing's research facility is coming along nicely. Those Saab infidels will soon regret messing with us!

Does it go up to 11...?

cheers

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Re: Damn that blower gone again.

Post by mac » 13 Jul 2013 12:18 pm

13 actually - using the revised warp scale!

Mac.
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Re: Damn that blower gone again.

Post by V6 Man » 14 Jul 2013 01:57 pm

It still needs some knife switches and some large, round, bakelite gauges with needles with arrows on the end.
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Re: Damn that blower gone again.

Post by Chris_C » 14 Jul 2013 10:45 pm

Give me a few days and we can sort knife switches... I'll have some nixie tubes somewhere for the upper class look?

(oooh, on that note, I was in a workshop not long ago and found a Bridgeport with a nixie tube DRO. You have no idea (well, you probably do) just how excited I may have become)
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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Re: Damn that blower gone again.

Post by S10NPH » 14 Jul 2013 10:59 pm

Your contraption reminds me of Regula 1:

Image
Last edited by S10NPH on 15 Jul 2013 10:08 am, edited 1 time in total.
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Re: Damn that blower gone again.

Post by mac » 15 Jul 2013 10:01 am

Oh wow, a Bridgeport with nixie tube readouts -

Was it also steam powered, or perhaps by a small child from the village in a treadmill?
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Re: Damn that blower gone again.

Post by Chris_C » 15 Jul 2013 02:49 pm

No... though was in a full sized steam train workshop...
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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