One serious shortcoming in every old car I've ever owned has been the heaters inability to live up to it's name. I've resolved the problem in my 140 fixed head by fitting a Mazda MX5 Matrix and blower unit. It works at least 5 times better than the original but I feel could still be improved on.
My requirement for the 120 is in a different league. I'm not too bothered about de-misting but on cold days the heater will need to send out a constant blast of really hot air to keep me, and in particular my legs (which are invariably cold) toasty warm.
As the car wasn't fitted with a heater of any kind, my only constraint is to try to make whatever I fit, appear reasonably similar to the optional equipment item. I also want it to work a good deal better than some of the modern after market heaters currently available.
So, two areas to consider - first is as big a matrix as I can possibly accommodate in the very limited space available and second is a a multi-speed blower, capable of shifting serious amounts of air through the heater matrix.
There is absolutely no point in having a matrix filled with slow moving warm water, and that I believe, is a major reason why many old car heaters are so poor. The colder the day, the less heat they appear to produce. I think (hope) the solution to this is to use an electric booster pump (EBP).
|Bosch Heater Pump with PWM control. Just need to hide|
the knob under the dash.
|My interpretation of how this will look and work with both |
Electric Water Pump (EWP) and Electric Booster Pump (EBP)
shown. The graph relates to the EWP control only.
|£48.00 Heater Matrix from Car Builder Solutions|
|Hole for Heater Matrix output cut in bulkhead|
|Draw it first, half the fun, if like me you enjoy that sort of thing,|
but still leaves some elements of 'making it up as you go along'
|Inside of enclosure with chamber divider Araldited in place|
|Side of heater matrix enclosure temporarily 'cleko'd' together.|
|Finished enclosure - Air inlet sits below bulkhead and has 4Nr|
3/16 UNF inserts araldited on to allow fixing of 63mm flange
for flexible pipe from blower.
|Water in / out side of enclosure|
|Finally in place on the bulkhead. Just needs a couple of Smiths |
Heater labels to fool all but the most astute XK aficionados.
The rivets will hopefully be less obvious without the camera flash.
Whilst I optimistically hope this will produce all the heat I could ever ask for, I am aware that it is at this stage mainly theoretical - The proof of the pudding etc.
My glass remains as ever, more than half full!!!
Rear wings and doors - Trial fit
|Doors will be taken off again to prevent damage, but I now|
know for certain that the gaps and fit are excellent.
Thanks to Alex and Niel at Auto-Bodycraft
Visitors invariably comment on the general tidiness of the workshop, but in reality they don't see the real mess it gets into on occasions. I usually call a halt when I can't find things anymore.
|Halfway through the heater enclosure job. Picture proves that|
it's not quite as organised as it sometimes seems.