SpitFire6 Posted February 15, 2021 Report Share Posted February 15, 2021 Hi, Refurbing a second hand heater box. Many questions to ask. I have a 1/3/4" & a 1 1/2" arriving in a few days. I want to make one serviceable for swap with existing unknow demister ID. First off, What are people using for replacement for the material fitted to the metal airflow "blade/flap". The material that makes a seal on the sweeping part? Has anybody fitted a central lock motor to control the flap? Three positions possible. Has anybody successfully installed a modern available blower motor? Replacing a 40 year old brushed motor is not a bad idea. How do you bleed the air from the top of the matrix? Cheers, Iain. Link to comment Share on other sites More sharing options...
thescrapman Posted February 16, 2021 Report Share Posted February 16, 2021 I assume you can fit a Smart 4/2 motor same as you can to a Mk3 heater box. I have a stock of very thin foam sheet that I have used in heater boxes in the past. Cut off slices and glue on. 1 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted February 16, 2021 Report Share Posted February 16, 2021 The Smart motor might fit the GT6 / spitfire heater box (it fits to the Herald box) but the problem is the fan which is too big and needs to be removed from the spindle. It's not easy to remove as they're a one-way push-fit, so easier on at the factory than off in the garage without damage, then a replacement fan of a suitable size has to be fitted and balanced otherwise the vibrations become very annoying. It can be done but it's not a straight swap. 1 Link to comment Share on other sites More sharing options...
Mjit Posted February 16, 2021 Report Share Posted February 16, 2021 I'm in the process of trying to update the fan in my Mk IV Spitfire - so far that's only gotten as far as buying a couple of cheap possibles off of eBay and deciding it's too cold in the garage (though a lot warmer today so might venture out this weekend). Will try to post something if I make any progress... 2 Link to comment Share on other sites More sharing options...
thescrapman Posted February 16, 2021 Report Share Posted February 16, 2021 The Smart he def fits the Mk3, as a friend Mike has done it. He reused the original fan, having drilled it out slightly to fit shaft of Smart motor. Link to comment Share on other sites More sharing options...
PeteH Posted February 16, 2021 Report Share Posted February 16, 2021 I have seen somewhere where the fan unit from Small Nissans have been used?. Pete. Link to comment Share on other sites More sharing options...
SpitFire6 Posted February 16, 2021 Author Report Share Posted February 16, 2021 Hi, I have overdriven my fan with success. I cannot remember the electrical figures but were low compared to a 2002 206CC fan that pulls 20Amps @ 12V, around 1/4 Kilowatt! I don't fancy drilling out the impeller as I can already increase the RPM of the OEM one. I'm after more flow with less RPM. Has anybody fitted a central locking "solenoid" to control the flap? I only need floor well & demist. Off will be demist. A 20mm stroke seems enough. I have thought about a bristle brush for the flap. Cheers, Iain. Link to comment Share on other sites More sharing options...
SpitFire6 Posted February 17, 2021 Author Report Share Posted February 17, 2021 Hi, Just received the 1 1/2" outlet heater box. The 1 3/4" looks like the one to use as it has air guides? around the drum fan. From my two samples I have, the 1 3/4" demists better I guess. Cheers, Iain. Link to comment Share on other sites More sharing options...
SpitFire6 Posted February 21, 2021 Author Report Share Posted February 21, 2021 Hi, Does the gasket between the box and bulkhead need to be this shape? Will not a rectangle with a hole in the centre suffice? Cheers, Iain. Link to comment Share on other sites More sharing options...
thescrapman Posted February 22, 2021 Report Share Posted February 22, 2021 As long as it is hidden it shouldn't matter what shape it is I would have Link to comment Share on other sites More sharing options...
SpitFire6 Posted February 22, 2021 Author Report Share Posted February 22, 2021 1 hour ago, thescrapman said: As long as it is hidden it shouldn't matter what shape it is I would have Happy days. I have rolls of self adhesive neoprene at work. Compresses to 1.5mm with minimal pressure as the OEM foam. Cheers, Iain. 1 Link to comment Share on other sites More sharing options...
Guppy916 Posted February 23, 2021 Report Share Posted February 23, 2021 Hi for the sealing foam on the flaps I used https://www.ebay.co.uk/itm/Armacell-Armaflex-Pipe-Insulation-Tape-self-adhesive-50mm-x-3mm-x-15metre-roll/224360339009?hash=item343ceb1641:g:WbcAAOSwUmhf8dwZ Nad the seal between the heater and bulkhead from Ang Classic Cars part number 61425 £5.45 https://www.ebay.co.uk/itm/TRIUMPH-SPITFIRE-GT6-HEATER-BOX-TO-PLENUM-CHAMBER-FOAM-SEAL-614125/372874523552?hash=item56d10db3a0:g:0y4AAOSwrxpd821K this all works great Link to comment Share on other sites More sharing options...
SpitFire6 Posted March 1, 2021 Author Report Share Posted March 1, 2021 Hi Guppy916, I saw the foam & the price before I realised I do not need the precision cut piece. I'm going to use a door brush draft excluder to sweep & seal. Is this what you used the Armaflex for? My flaps only need to be in one of two positions. Demist & floor or Demist only. Was hoping to finalise it this week but Covid prevents me from leaving the house & going to work to retrieve the cover. LOL. Link to comment Share on other sites More sharing options...
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