MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG Midget and Sprite Technical - Heater Fan

Does anyone have any idea of a flow rate for the heater fan? Sadly can't measure it as I don't has access to measuing kit nowadays.
Graeme Williams

(By way of explanation to what might seem a nerdy question: I want to get more air into a Sebring rep cockpit in the summer. My plan of action is to put a bilge fan at the end of the elephant trunking. These are used on MGA to chuck air around the carbs to prevent fuel problems in hot weather. These fans chuck out 200 cfm and just wondered whether that would be significant)
Graeme Williams

Graeme,


A good idea to cool the interior and the carbs. There are plastic or iron left and right turning fans for the heater. A clockwise turning fan on a clockwise turning motor gives more air and noise than the standard delivered anti clockwise fan on a clockwise motor. Noise was more important than more air for the heater. I have considered to cool the carbs wit an additional duct on de left of the grill. Leaving out the left headlamp unit gave more HP and stopped the vacuum lock. Above 20 mph the heater is a restriction for more cool air.....

Flip



Flip Brühl

Slightly more expensive but a lot more efficient and I would think...

http://www.carbuildersolutions.com/uk/universal-air-conditioning-unit

..a bit more difficult to fit.

I'll get my coat.


Jeremy MkIII

Flip: MGA have a 4" duct on the carb side, mirroring the heater duct. It is common practice to use a 4" bilge fan in the duct and blast the air through the carb installation. I did this (on my A) and it stopped the rough running which occurred when temperatures rose in the engine bay. Turn on when required for a few minutes. These fans are not expensive - about £20 for the premium make. You can hear it running but not excessively and probably not at speed.
Graeme Williams

Graeme

Have you had a chat with Alan Anstead of MASC Kent as I understand he had concerns about high temps in his Sebring Sprite Coupe replica when touring so fitted a Mini van roof vent/Series Land Rover safari roof vent. I wonder how well that has worked in terms of producing a through draft, perhaps combined with a certain setting on cracking open the side-screens.

Cheers
Mike
M Wood

Mike: Meet Alan regularly as we are both Kent MASC. I don't like the idea of cutting "a big 'ole in the roof" and so exploring alternatives. Alan is interested in how the booster fan works.

I can see a couple of issues: I don't know how much the heater coil and relatively small outlets in the cabin with restrict flow and also the air getting in needs to escape otherwise that will restrict flow too.
The fan is not a lot of money for the benefit it might create so wiorth experimenting.
Graeme Williams

Can you find a discreet low-pressure area at the back of the car so you can cut a hole and let the air out? If there is nowhere for the air to escape, then even a huge fan blowing in at the front will make only a small difference. But for £20 you could have a go and see what happens...
Jonathan Severn

On a more serious note, if you're considering cutting the top to fit a Mini/LR roof vent, how about something like this as an alternative? More involved but a neater solution.


Jeremy MkIII

How about slots in the wing just above the sill to improve the air flow as per the works big healeys?
Bob Beaumont

This thread was discussed between 10/03/2019 and 13/03/2019

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.