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Spitfire heater blower


1969Mk3Spitfire
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27 minutes ago, Mad4classics said:

 

The MGB single speed motor could also be made to fit if you ignored the three hole mounting flange half way along the body and used the motor through bolts

David

Do you know that for sure, David? They seem to be more readily available (on ebay)

Thanks, Colin, I followed your search and quickly looked through 250 listing and found 2.  One, already linked by David, seems to have a bare metal coloured motor and one other, advertised as untested. I've contacted both sellers to ask a few questions.

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25 minutes ago, 1969Mk3Spitfire said:

Do you know that for sure, David? They seem to be more readily available (on ebay)



No I don't know for sure; but except for the flange mounted half way along the front portion which you could either remove or leave it has two bolts passing through and a compression nut fan blade fixing. Perhaps a question for the MGOC forum. It's as @Colin Lindsay says "of similar vintage".

You haven't got a lot of room to play with because of the speedo and tacho cable apertures if you chose something else.

David

Screenshot from 2020-08-31 18-58-14.png

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14 minutes ago, thescrapman said:

https://club.triumph.org.uk/menu/7445/item/579840/view

link to A post by Mike who fitted a Smart motor to a .mk3

it is very effective, I have been in the car.

They're certainly cheap; limited room in the Spitfire box but wonder how it would look in a Herald heater?

Why did he need a PWM unit?

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11 hours ago, NonMember said:

I think just because it's a much more powerful motor and that gives him a multi-speed option. It's more efficient to PWM than use big, hot resistors that could be hard to fit in the space.

Aha! So: if you just wanted single speed, you wouldn't need one? I wondered if maybe it was a higher current rating than the original Herald version but then it's probably way more efficient. Might be worth experimenting.

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1 hour ago, Colin Lindsay said:

Aha! So: if you just wanted single speed, you wouldn't need one? I wondered if maybe it was a higher current rating than the original Herald version but then it's probably way more efficient. Might be worth experimenting.

Or as most PWMs seem to work off a potentiometer to control actual fan speed you should be able to replace that with wiring to the original 2 speed switch, with maybe some experimenting on inline resistors to get appropreate high/low speeds...

Upgrading the blower motor is on my Spitfire "post Duxford" fiddle list.

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Hi - I'm the Mike that Colin Scrapman was referring to above, who fitted the SmartCar heater blower motor to a MK3 Spitfire.  I used a PWM from China (very cheap) and used a potentiometer that also had an on/off switch incorporated into it, 1960's transistor radio style.  This meant that I only needed one hole in the dashboard to switch the blower on and adjust its speed and air output. I can't remember now how much current the motor actually drew at full chat, but it would have been about 4 or 5amps or so. The PWM I used, with its heatsink and its switch is easily up to the job and does not overheat.  The output of the blower at full blast is too much to bear in a Spitfire cabin, so its useful having an infinitely adjustable speed control.  I'll try and trawl though my eBay purchases and post up the actual unit I used.

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37 minutes ago, Sparky_Spit said:

Hi - I'm the Mike that Colin Scrapman was referring to above, who fitted the SmartCar heater blower motor to a MK3 Spitfire.

Excellent, Mike - thanks for the explanation. With the Herald being single speed I wondered if you'd required one for two-speed-fan cars, but if it's a variable speed rheostat thing, I'm definitely interested in trying the system for a Herald. It should be easier to fit with the larger heater box and extra room on the bulkhead rather than under it.

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On 01/09/2020 at 04:16, Mad4classics said:

There are  always companies who specialise in electic motor restoration of this sort for veteran cars.

http://www.robsonandfrancisrewinds.co.uk/veteran/index.html

 

Thanks for the link, David.  They wouldn't give me a quote until they had seen the motor but told me that their prices start from £125.

Fortunately, Canley Classics tell me that they have one.

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3 hours ago, 1969Mk3Spitfire said:

 

Fortunately, Canley Classics tell me that they have one.

Pleased you found one.

Came accross this brand new Clayton heater motor which looks as it could be adapted by reversing the bolts and ignoring the flange mount.

https://www.holden.co.uk/p/clayton_heater_fan_motor_single_shaft_1_4_in

Just for reference; made in Canada?

And Ashley Hinton is re-making the original Smiths fan blade using the original tooling, which is where I went when mine broke.

https://www.mg-cars.org.uk/ah/

He also sells through ebay:-

https://www.ebay.co.uk/itm/Triumph-Spitfire-MK1-MK2-MK3-to-1970-LOTUS-MK14-HEATER-FAN-NEW-/254353759457?nav=SEARCH

David

screenshot20200903_104019335.png

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